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(8:30PM - 7/26/20) A short duration period of hot and humid conditions continues to affect the state and region, and will continue to through Monday.
Summary.... A strong ridge briefly built into the region this weekend, allowing for a brief push of hot and humid conditions. While this was not a heat wave by our standards, it has been noteworthy enough to discuss. The most widespread hot and humid conditions were on Saturday and today across the state, with conditions tempering for Monday as a “cold” front moves across the state. 
Forecast For Tomorrow...
Monday, July 27th Forecast... High temperatures will range from the low 80's to low 90's across the state. Heat index values will be in the low 80’s to mid 90’s across the state. Low temperatures in the low 60's to mid 70's will be common across the state. A “cold” front moving across the state will usher in cooler temperatures and lower humidity, along with the chance for scattered showers and t’storms.
Recap Summary...
Friday, July 24th Recap... High temperatures topped out in the upper 80's to low 90's across Western and Southern Illinois, with low to upper 80's across Northern and Eastern Illinois. Heat index values were in the upper 80's to mid 90's across Western and Southern Illinois, and the low 80's to low 90's across Northern and Eastern Illinois. Low temperatures in the low 60's to upper 70's were common across the state. Saturday, July 25th Recap... High temperatures topped out the upper 80's to mid 90's across the state. Heat index values were in the low 90's to low 100's across Northwest, Western and Southern Illinois, and the upper 80's to mid 90's across Northeast and Eastern Illinois. Low temperatures in the low 60's to low 70's were common across the state. Sunday, July 26th Forecast... High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values were in the low 90's to mid 100's across the state. Low temperatures in the mid 60's to mid 70's were common across the state. Scattered showers and t’storms moved into portions of Northern Illinois Sunday evening, tempering the heat for some areas.
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(9:30PM - 7/25/20) A short duration period of hot and humid conditions continues to affect the state and region, and will continue to through Monday.
Summary.... A strong ridge is briefly building into the region this weekend, allowing for a brief push of hot and humid conditions. While this will not be a heat wave by our standards, it is noteworthy enough to discuss. The most widespread hot and humid conditions will be through Sunday across the state, when high temperatures well into the 90's and heat index values in the mid 90's to mid 100's are likely. FrMonday will serve as fringe/ending day, with only portions of the state being affected with tempered conditions. 
Forecast For Next Two Days...
Sunday, July 26th Forecast... High temperatures will range from the upper 80's to mid 90's across the state. Heat index values will be in the low 90's to low 100's across the state as well. Low temperatures in the mid 60's to mid 70's will be common across the state. Scattered showers and t’storms will be possible across portions of Northern Illinois, tempering the heat for some areas. Monday, July 27th Forecast... High temperatures will range from the mid 80's to low 90's across Southern Illinois. Heat index values will be in the mid 80’s to mid 90’s across Southern Illinois as well. Low temperatures in the low 60's to mid 70's will be common across the state. A “cold” front moving across the state will usher in cooler temperatures and lower humidity, ending the heat episode across Northern and Central Illinois. Scattered showers and t’storms will accompany the front, across portions of Central and Southern Illinois.
Recap Summary...
Friday, July 24th Recap... High temperatures topped out in the upper 80's to low 90's across Western and Southern Illinois, with low to upper 80's across Northern and Eastern Illinois. Heat index values were in the upper 80's to mid 90's across Western and Southern Illinois, and the low 80's to low 90's across Northern and Eastern Illinois. Low temperatures in the low 60's to upper 70's were common across the state. Saturday, July 25th Recap... High temperatures topped out the upper 80's to mid 90's across the state. Heat index values were in the low 90's to low 100's across Northwest, Western and Southern Illinois, and the upper 80's to mid 90's across Northeast and Eastern Illinois. Low temperatures in the low 60's to low 70's were common across the state.
(9:00PM - 7/24/20) A short duration period of hot and humid conditions has begun to affect the state and region, and will continue to through this weekend.
Summary.... A strong ridge is briefly building into the region this weekend, allowing for a brief push of hot and humid conditions. While this will not be a heat wave by our standards, it is noteworthy enough to discuss. The most widespread hot and humid conditions will be on Saturday and Sunday across the state, when high temperatures well into the 90's and heat index values in the mid 90's to mid 100's are likely. Friday and Monday will serve as fringe days, with only portions of the state being affected with tempered conditions. 
Forecast For Next Two Days...
Saturday, July 25th Forecast... High temperatures will range from the upper 80's to mid 90's across the state. Heat index values will be in the low 90's to low 100's across Northwest, Western and Southern Illinois, to the upper 80's to mid 90's across Northeast and Eastern Illinois. Low temperatures in the low 60's to low 70's will be common across the state. Sunday, July 26th Forecast... High temperatures will range from the upper 80's to mid 90's across the state. Heat index values will be in the low 90's to low 100's across the state as well. Low temperatures in the mid 60's to mid 70's will be common across the state. Scattered showers and t’storms will be possible across portions of Northern Illinois, tempering the heat for some areas.
Recap Summary...
Friday, July 24th Recap... High temperatures topped out in the upper 80's to low 90's across Western and Southern Illinois, with low to upper 80's across Northern and Eastern Illinois. Heat index values were in the upper 80's to mid 90's across Western and Southern Illinois, and the low 80's to low 90's across Northern and Eastern Illinois. Low temperatures in the low 60's to upper 70's were common across the state.
(12:30PM - 7/23/20) A short duration period of hot and humid conditions are expected across the state and region for this weekend.
Summary.... A strong ridge is expected to briefly build into the region this weekend, allowing for a brief push of hot and humid conditions. While this will not be a heat wave by our standards, it is noteworthy enough to discuss. The most widespread hot and humid conditions will be on Saturday and Sunday across the state, when high temperatures well into the 90's and heat index values in the mid 90's to mid 100's are likely. Friday and Monday will serve as fringe days, with only portions of the state being affected with tempered conditions. 
Forecast For Next Two Days...
Friday, July 24th Forecast... High temperatures will range from the upper 80's to low 90's across Western and Southern Illinois, with low to upper 80's across Northern and Eastern Illinois. Heat index values will be in the upper 80's to mid 90's across Western and Southern Illinois, with low 80's to low 90's across Northern and Eastern Illinois. Low temperatures in the low 60's to upper 70's will be common across the state. Saturday, July 25th Forecast... High temperatures will range from the upper 80's to mid 90's across thee state. Heat index values will be in the low 90's to low 100's across Western and Southern Illinois, to the upper 80's to mid 90's across Northern and Eastern Illinois. Low temperatures in the low 60's to low 70's will be common across the state.
(8:30PM - 7/22/20) A heat wave spanning over several days impacted portions of the region and state, July 14-22nd. This heat wave brought multiple days with high temperatures well into the 90's across Southern Illinois, along with several days of high humidity and heat indices. Further north across Northern and Central Illinois, the heat wave was muted by an active rain and t'storm pattern.
Overview.... A heat wave impacted portions of the state and region during mid July. The most consistently hot temperatures and humid conditions occurred across Southern Illinois. For Southern Illinois, high temperatures into the 90's and heat index values will into the 90's and 100's were common almost on a daily basis. Across Northern and Central Illinois, the hottest temperatures and most humid conditions were the weekend of July 18/19th, as the ridge flexed northward for a time. An active storm pattern was also in place, which held conditions in check across northern and Central Illinois, and tempered the heat at times for Southern Illinois. 
Recap Summary...
Tuesday, July 14th Recap... High temperatures topped out in the upper 80's to low 90's across Southern Illinois, with mid 80's Northern and Central Illinois. Heat index values were in the upper 80's to mid 90's across Southern Illinois, and mid to upper 80's across Northern and Central Illinois. Low temperatures in the low 60's to upper 60's were common across the state. Wednesday, July 15th Recap... High temperatures topped out in the upper 80's to mid 90's across Southern Illinois, with upper 70's to upper 80's Northern and Central Illinois. Heat index values in the low 90's to low 100's occurred across Southern Illinois, and upper 70's to low 90's across Northern and Central Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of showers and t'storms occurred across the state, which kept areas such as Northwest and Western Illinois cooler. Thursday, July 16th Recap... High temperatures topped out in the upper 80's to mid 90's across Southern Illinois, with mid 70's to upper 80's Northern and Central Illinois. Heat index values in the low 90's to low 100's occurred across Southern Illinois, and mid 70's to low 90's across Northern and Central Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of showers and t'storms occurred across the state, which kept areas such as Northwest and Western Illinois cooler. Friday, July 17th Recap... The ridge started to flex into the region a bit more on Friday, leading to more widespread hotter and humid conditions across the state. High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values ranged from the upper 80's to mid 90's across Northern Illinois, to the low 90's to low 100's across Central and Southern Illinois. Low temperatures in the low 60's to mid 70's were common across the state. Saturday, July 18th Recap... The core of the ridge flexed into the region on Saturday, bringing the most widespread hot and humid conditions of this period. High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values ranged from the mid 90's to upper 100's across the state. Low temperatures in the low 60's to mid 70's were common across the state. Isolated showers and t'storms moved across Northern Illinois, though this activity did not temper conditions much. Sunday, July 19th Recap... A "cold" front pushed southward across the state on Sunday. Along with the front came scattered showers and t'storms, which pushed across Northern and Central Illinois Sunday morning into afternoon and Central and Southern Illinois Sunday afternoon into night. High temperatures topped out in the low to upper 90's across Southern Illinois, and the mid to upper 80's across Northern and Central Illinois. Heat index values ranged from the mid 90's to upper 100's across Southern Illinois, to the mid 80's to low 90's across Northern and Central Illinois. Low temperatures in the mid 60's to upper 70's were common across the state. Monday, July 20th Recap... High temperatures topped out in the mid 80's to low 90's across Southern Illinois, to the mid to upper 80's across Northern and Central Illinois. Heat index values in the upper 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state. Periods of scattered showers and t'storms pushed across Central and Southern Illinois, tempering the heat for some areas. Tuesday, July 21st Recap... High temperatures topped out the upper 80's to mid 90's across Southern Illinois, and the low to upper 80's across Northern and Central Illinois. Heat index values were in the upper 80's to upper 90's across Southern Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of scattered showers and t'storms pushed across the state at times as a "cold" front approached, which tempered the heat for some areas. Wednesday, July 22nd Recap... High temperatures topped out the mid 80's to low 90's across Southern Illinois, and the low to upper 80's across Northern and Central Illinois. Heat index values were in the mid 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's were common across the state. Isolated to scattered showers and t'storms affected portions of Central and Southern Illinois, in the vicinity a "cold" front moving across the state.
(6:00PM - 7/21/20) The heat wave that has been affecting portions of the state and region over the past week or so is steadily winding down, with only lingering affecting expected across Southern Illinois through Thursday.
Summary.... A heat wave has been affecting portions of the state for the past week or so, and now steadily winding down. The most consistently hot temperatures and humid conditions during this period have been across Southern Illinois. Across Northern and Central Illinois, the hottest temperatures and most humid conditions were this past weekend, as the ridge flexed northward for a time. Additionally, an active storm pattern has been in place, which tempered the heat at times for many areas. Through Thursday, high temperatures in the mid 80's to low 90's will occur on a daily basis across Southern Illinois, with somewhat cooler temperatures across Northern and Central Illinois. Low temperatures in the low 60's to low 70's will be likely on a nightly basis across the state. High humidity and heat indices will continue to be likely across Southern Illinois as well, with heat index values in the low to upper 90's likely on a daily basis. Heat index values across Northern and Central Illinois will be more tolerable, in the low to upper 80's. An update will be provided each day for the duration of this heat wave across the state. Each update will feature a recap of previous days temperatures, along with the forecast for the next two days, and any other overall additional information. 
Forecast For Next Two Days...
Wednesday, July 22nd Forecast... High temperatures will range from the mid 80's to low 90's across Southern Illinois, to the upper 70's to mid 80's across Northern and Central Illinois. Heat index values in the mid 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state. Periods of scattered showers and t'storms will be possible across Southern Illinois at times as a "cold" front continues to sweep across the state, tempering the heat for some areas. Thursday, July 23rd Forecast... High temperatures will range from the mid 80's to low 90's across Southern Illinois, to the upper 70's to mid 80's across Northern and Central Illinois. Heat index values in the mid 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state.
Recap Summary...
Tuesday, July 14th Recap... High temperatures topped out in the upper 80's to low 90's across Southern Illinois, with mid 80's Northern and Central Illinois. Heat index values were in the upper 80's to mid 90's across Southern Illinois, and mid to upper 80's across Northern and Central Illinois. Low temperatures in the low 60's to upper 60's were common across the state. Wednesday, July 15th Recap... High temperatures topped out in the upper 80's to mid 90's across Southern Illinois, with upper 70's to upper 80's Northern and Central Illinois. Heat index values in the low 90's to low 100's occurred across Southern Illinois, and upper 70's to low 90's across Northern and Central Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of showers and t'storms occurred across the state, which kept areas such as Northwest and Western Illinois cooler. Thursday, July 16th Recap... High temperatures topped out in the upper 80's to mid 90's across Southern Illinois, with mid 70's to upper 80's Northern and Central Illinois. Heat index values in the low 90's to low 100's occurred across Southern Illinois, and mid 70's to low 90's across Northern and Central Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of showers and t'storms occurred across the state, which kept areas such as Northwest and Western Illinois cooler. Friday, July 17th Recap... The ridge started to flex into the region a bit more on Friday, leading to more widespread hotter and humid conditions across the state. High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values ranged from the upper 80's to mid 90's across Northern Illinois, to the low 90's to low 100's across Central and Southern Illinois. Low temperatures in the low 60's to mid 70's were common across the state. Saturday, July 18th Recap... The core of the ridge flexed into the region on Saturday, bringing the most widespread hot and humid conditions of this period. High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values ranged from the mid 90's to upper 100's across the state. Low temperatures in the low 60's to mid 70's were common across the state. Isolated showers and t'storms moved across Northern Illinois, though this activity did not temper conditions much. Sunday, July 19th Recap... A "cold" front pushed southward across the state on Sunday. Along with the front came scattered showers and t'storms, which pushed across Northern and Central Illinois Sunday morning into afternoon and Central and Southern Illinois Sunday afternoon into night. High temperatures topped out in the low to upper 90's across Southern Illinois, and the mid to upper 80's across Northern and Central Illinois. Heat index values ranged from the mid 90's to upper 100's across Southern Illinois, to the mid 80's to low 90's across Northern and Central Illinois. Low temperatures in the mid 60's to upper 70's were common across the state. Monday, July 20th Recap... High temperatures topped out in the mid 80's to low 90's across Southern Illinois, to the mid to upper 80's across Northern and Central Illinois. Heat index values in the upper 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state. Periods of scattered showers and t'storms pushed across Central and Southern Illinois, tempering the heat for some areas. Tuesday, July 21st Recap... High temperatures topped out the upper 80's to mid 90's across Southern Illinois, and the low to upper 80's across Northern and Central Illinois. Heat index values were in the upper 80's to upper 90's across Southern Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of scattered showers and t'storms pushed across the state at times as a "cold" front approached, which tempered the heat for some areas.
(11:45AM - 7/20/20) Multiple disturbances will be moving through the region will continue to bring a low end severe t'storm threat to portions of the state, through tonight.
Summary... Tuesday, July 21st Forecast... Scattered areas of showers and t'storms have been ongoing across portions of Northern and Central Illinois this morning. Isolated severe t'storms have occurred with one of the clusters, as it has pushed across Eastern Illinois. All of this activity will exit Northeast and Eastern Illinois within the next for hours. In the wake of this early day activity, some clearing and destabilization will occur across the state. As another disturbance moves across the state this afternoon into tonight, additional scattered showers and t'storms will move across the state along with it. This activity, in the form of clusters and scattered activity, will push across the state this afternoon into tonight. An environment in place will feature low to moderate instability, high moisture, marginal shear and marginal forcing. This will support upwards of a minimal severe t'storm threat across much of the state. Damaging winds, large hail and an isolated will be the main threats. Additionally, given recent heavy rainfall across portions of the state and the expected additional rainfall, some localized flooding and high rainfall totals will be possible. Wednesday, July 22nd Forecast... While isolated to scattered showers and t'storms will be possible in the vicinity of a front across far Southern Illinois Wednesday morning into Wednesday night, any severe t'storm threat is negligible. Below is the severe t'storm forecast this afternoon - tonight. 
Recap Summary...
Sunday, July 19th... As a "cold" front pushed into the state, an axis of scattered showers and t'storms developed ahead of it, and moved across portions of Northern and Central Illinois, early Sunday morning into early Sunday afternoon. Some of this activity was severe, with damaging winds being the common threat. Localized flooding also occurred in some areas. Additional scattered showers and t'storms developed across portions of Central and Southern Illinois Sunday afternoon and evening. This activity moved across these areas through Sunday night. Isolated severe t'storms occurred, with damaging winds and large hail having been the common threats. Localized flooding also occurred in some areas. Monday, July 20th Recap... Isolated to scattered showers and t'storms pushed across portions of Southern Illinois Monday morning. As a disturbance moved through the day on Monday, additional scattered showers and t'storms developed and moved across Southern and Central Illinois, Monday afternoon into Monday night. Isolated severe t'storms occurred, with damaging winds and large hail the main threats. Additionally, some localized flooding also occurred in some areas.
(9:30PM - 7/20/20) Multiple disturbances will be moving through the region during this period, which will bring the chance for a low end severe t'storm threat to portions the state each day.
Summary... Monday Night, July 20th... Isolated to scattered showers and t'storms will continue to be possible across portions of Central and Southern Illinois. A very marginal environment is in place, thus only a very isolated severe t'storm will be possible. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall for some areas and the possible additional rainfall, some localized flooding and high rainfall totals will be possible. Tuesday, July 21st... Isolated to scattered showers will be ongoing Tuesday morning across portions of Central and Southern Illinois. In the wake of this potential early day activity, some clearing and destabilization will occur across the state. As another disturbance moves across the state on Tuesday, scattered showers and t'storms will move across the state along with it. This activity, in the form of clusters and scattered activity, will push across the state Tuesday afternoon into Tuesday night. An environment in place will feature moderate instability, high moisture, marginal shear and marginal forcing. This will support upwards of a minimal severe t'storm threat across much of the state. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall across portions of the state and the expected additional rainfall, some localized flooding and high rainfall totals will be possible. Below is the severe t'storm forecast Tuesday morning - Tuesday night. 
Recap Summary...
Sunday, July 19th... As a "cold" front pushed into the state, an axis of scattered showers and t'storms developed ahead of it, and moved across portions of Northern and Central Illinois, early Sunday morning into early Sunday afternoon. Some of this activity was severe, with damaging winds being the common threat. Localized flooding also occurred in some areas. Additional scattered showers and t'storms developed across portions of Central and Southern Illinois Sunday afternoon and evening. This activity moved across these areas through Sunday night. Isolated severe t'storms occurred, with damaging winds and large hail having been the common threats. Localized flooding also occurred in some areas.
(6:00PM - 7/20/20) A heat wave continues to affect portions of the region, and will continue over the next few days...Bringing hot temperatures, high humidity and high heat indices to portions of the state and region during this period.
Summary.... A heat wave has been affecting portions of the state the past several days, and will continue to impact portions of the state and region over the next few days. The most consistently hot temperatures and humid conditions have been and will continue to be across Southern Illinois. Across Northern and Central Illinois, the hottest temperatures and most humid conditions were this past weekend, as the ridge flexed northward for a time. Additionally, an active storm pattern has been in place and will continue this week, which will temper the heat at times for Southern Illinois. For this week, high temperatures in the upper 80's to mid 90's will occur on a daily basis across Southern Illinois, with somewhat cooler temperatures across Northern and Central Illinois. Low temperatures in the low 60's to mid 70's will be likely on a nightly basis across the state. High humidity and heat indices will continue to be likely across Southern Illinois as well, with heat index values in the low 90's to mid 100's likely on a daily basis. Heat index values across Northern and Central Illinois will be more tolerable, in the low 80's to mid 90's. An update will be provided each day for the duration of this heat wave across the state. Each update will feature a recap of previous days temperatures, along with the forecast for the next two days, and any other overall additional information.
Forecast For Next Two Days...
Tuesday, July 21st Forecast... High temperatures will range from the upper 80's to mid 90's across Southern Illinois, to the low to upper 80's across Northern and Central Illinois. Heat index values in the upper 80's to upper 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state. Periods of scattered showers and t'storms will be possible across the state at times as a "cold" front approaches, which will temper the heat for some areas. Wednesday, July 22nd Forecast... High temperatures will range from the mid 80's to low 90's across Southern Illinois, to the upper 70's to mid 80's across Northern and Central Illinois. Heat index values in the mid 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state. Periods of scattered showers and t'storms will be possible across Southern Illinois at times as a "cold" front continues to sweep across the state, tempering the heat for some areas.
Recap Summary...
Tuesday, July 14th Recap... High temperatures topped out in the upper 80's to low 90's across Southern Illinois, with mid 80's Northern and Central Illinois. Heat index values were in the upper 80's to mid 90's across Southern Illinois, and mid to upper 80's across Northern and Central Illinois. Low temperatures in the low 60's to upper 60's were common across the state. Wednesday, July 15th Recap... High temperatures topped out in the upper 80's to mid 90's across Southern Illinois, with upper 70's to upper 80's Northern and Central Illinois. Heat index values in the low 90's to low 100's occurred across Southern Illinois, and upper 70's to low 90's across Northern and Central Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of showers and t'storms occurred across the state, which kept areas such as Northwest and Western Illinois cooler. Thursday, July 16th Recap... High temperatures topped out in the upper 80's to mid 90's across Southern Illinois, with mid 70's to upper 80's Northern and Central Illinois. Heat index values in the low 90's to low 100's occurred across Southern Illinois, and mid 70's to low 90's across Northern and Central Illinois. Low temperatures in the low 60's to low 70's were common across the state. Periods of showers and t'storms occurred across the state, which kept areas such as Northwest and Western Illinois cooler. Friday, July 17th Recap... The ridge started to flex into the region a bit more on Friday, leading to more widespread hotter and humid conditions across the state. High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values ranged from the upper 80's to mid 90's across Northern Illinois, to the low 90's to low 100's across Central and Southern Illinois. Low temperatures in the low 60's to mid 70's were common across the state. Saturday, July 18th Recap... The core of the ridge flexed into the region on Saturday, bringing the most widespread hot and humid conditions of this period. High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values ranged from the mid 90's to upper 100's across the state. Low temperatures in the low 60's to mid 70's were common across the state. Isolated showers and t'storms moved across Northern Illinois, though this activity did not temper conditions much. Sunday, July 19th Recap... A "cold" front pushed southward across the state on Sunday. Along with the front came scattered showers and t'storms, which pushed across Northern and Central Illinois Sunday morning into afternoon and Central and Southern Illinois Sunday afternoon into night. High temperatures topped out in the low to upper 90's across Southern Illinois, and the mid to upper 80's across Northern and Central Illinois. Heat index values ranged from the mid 90's to upper 100's across Southern Illinois, to the mid 80's to low 90's across Northern and Central Illinois. Low temperatures in the mid 60's to upper 70's were common across the state. Monday, July 20th Recap... High temperatures topped out in the mid 80's to low 90's across Southern Illinois, to the mid to upper 80's across Northern and Central Illinois. Heat index values in the upper 80's to mid 90's across Southern Illinois. Low temperatures in the low 60's to low 70's across the state. Periods of scattered showers and t'storms pushed across Central and Southern Illinois, tempering the heat for some areas.
(11:45AM - 7/20/20) Multiple disturbances will be moving through the region during this period, which will bring the chance for a low end severe t'storm threat to portions the state each day.
Summary... Monday, July 20th... Isolated to scattered showers and t'storms have been ongoing this morning across portions of Southern Illinois. As a disturbance moves across the state today, additional scattered showers and t'storms will develop and move across Southern, and perhaps portions of Central Illinois, this afternoon into tonight. An environment in place will feature moderate instability, high moisture, marginal shear and marginal forcing will be in place. This will support upwards of a minimal severe t'storm threat across the southern portion of the state. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall across Southern Illinois and the expected additional rainfall, some localized flooding and high rainfall totals will be possible. Tuesday, July 21st... Isolated to scattered showers may be ongoing Tuesday morning across portions of Central and Southern Illinois. In the wake of this potential early day activity, some clearing and destabilization will occur across the state. As another disturbance moves across the state on Tuesday, scattered showers and t'storms will move across the state with it. This activity, int he form of clusters, will push across the state Tuesday afternoon into Tuesday night. An environment in place will feature moderate instability, high moisture, marginal shear and marginal forcing will be in place. This will support upwards of a minimal severe t'storm threat across much of the state. Damaging winds and large hail will be the main threats. Additionally, given recent heavy rainfall across portions of the state and the expected additional rainfall, some localized flooding and high rainfall totals will be possible. Below are the severe t'storm forecasts for Monday afternoon - Monday night and Tuesday morning - Tuesday night.
Recap Summary...
Sunday, July 19th... As a "cold" front pushed into the state, an axis of scattered showers and t'storms developed ahead of it, and moved across portions of Northern and Central Illinois, early Sunday morning into early Sunday afternoon. Some of this activity was severe, with damaging winds being the common threat. Localized flooding also occurred in some areas. Additional scattered showers and t'storms developed across portions of Central and Southern Illinois Sunday afternoon and evening. This activity moved across these areas through Sunday night. Isolated severe t'storms occurred, with damaging winds and large hail having been the common threats. Localized flooding also occurred in some areas. |
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