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(6:00AM - 8/29/21) A period of hot and humid conditions will continue across the region, though today. Hot temperatures, high humidity and high heat indices have occurred across the state and region during this period.
Summary.... A large and elongated ridge is in place across the Central to Eastern US, which is helping to extend hot and humid conditions into the state and region for several day period of time, through today. During this time, high temperatures have made it into the 90's for many areas across the state for several days during this period. Additionally have been the high heat index values, a product of high humidity/high dew points into the low 70's to low 80's...Leading to heat index values into the 95-110 degree range for many areas for several days during this period.
Forecast For Next Two Days...
Sunday, Aug 29th Forecast... High temperatures will range from the mid 80's to low 90's across the state, with low temperatures ranging from the mid 60's to mid 70's. Heat index values will peak in the low 90's to low 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. 
Recap Summary...
Monday, Aug 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across Central and Southern Illinois, and low temps in the low 60's to low 70's. Peak heat index values peaked in the low to upper 90's. Tuesday, Aug 24th Recap... High temperatures topped out in the low to upper 90's across the state, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the upper 90's to low 110's. Wednesday, Aug 25th Recap... High temperatures topped out in the low to upper 90's across all but Northwest Illinois, and low temps in the mid 60's to upper 70's. Peak heat index values peaked in the upper 90's to upper 100's. Thursday, Aug 26th Recap... High temperatures topped out in the upper 80's to upper 90's across all but Northwest Illinois, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the mid 90's to upper 100's. Friday, Aug 27th Recap... High temperatures topped out in the upper 80's to mid 90's across the state, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the mid 90's to upper 100's. Saturday, Aug 28th Recap... High temperatures topped out in the upper 80's to mid 90's across the state, and low temps in the upper 60's to mid 70's. Peak heat index values peaked in the low 90's to mid 100's.
JP
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(8:45PM - 8/27/21) A period of hot and humid conditions will continue across the region, impacting the state through this weekend. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.
Summary.... A large and elongated ridge is in place across the Central to Eastern US, which is helping to extend hot and humid conditions into the state and region for several day period of time, through this weekend. During this time, high temperatures will make it into the 90's for many areas across the state for several days during this period. Additionally of note will be the high heat index values, a product of high humidity/high dew points into the low 70's to low 80's...Leading to heat index values into the 95-110 degree range for many areas for several days during this period.
Forecast For Next Two Days...
Saturday, Aug 28th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the upper 60's to mid 70's. Heat index values will peak in the mid 90's to mid 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. Sunday, Aug 29th Forecast... High temperatures will range from the upper 80's to low 90's across the state, with low temperatures ranging from the upper 60's to mid 70's. Heat index values will peak in the mid 90's to low 100's. Note: Rain/t'storm could temper the heat/humidity for some areas.
Recap Summary...
Monday, Aug 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across Central and Southern Illinois, and low temps in the low 60's to low 70's. Peak heat index values peaked in the low to upper 90's. Tuesday, Aug 24th Recap... High temperatures topped out in the low to upper 90's across the state, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the upper 90's to low 110's. Wednesday, Aug 25th Recap... High temperatures topped out in the low to upper 90's across all but Northwest Illinois, and low temps in the mid 60's to upper 70's. Peak heat index values peaked in the upper 90's to upper 100's. Thursday, Aug 26th Recap... High temperatures topped out in the upper 80's to upper 90's across all but Northwest Illinois, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the mid 90's to upper 100's.
JP
(8:45PM - 8/26/21) A period of hot and humid conditions will continue across the region, impacting the state through this upcoming weekend. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.
Summary.... A large and elongated ridge is in place across the Central to Eastern US, which is helping to extend hot and humid conditions into the state and region for several day period of time, through this upcoming weekend. During this time, high temperatures will make it into the 90's for many areas across the state for several days during this period. Additionally of note will be the high heat index values, a product of high humidity/high dew points into the low 70's to low 80's...Leading to heat index values into the 95-110 degree range for many areas for several days during this period.
Forecast For Next Two Days...
Friday, Aug 27th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the mid 60's to mid 70's. Heat index values will peak in the mid 90's to mid 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. Saturday, Aug 28th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the mid 60's to mid 70's. Heat index values will peak in the mid 90's to mid 100's. Note: Rain/t'storm could temper the heat/humidity for some areas.
Recap Summary...
Monday, Aug 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across Central and Southern Illinois, and low temps in the low 60's to low 70's. Peak heat index values peaked in the low to upper 90's. Tuesday, Aug 24th Recap... High temperatures topped out in the low to upper 90's across the state, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the upper 90's to low 110's. Wednesday, Aug 25th Recap... High temperatures topped out in the low to upper 90's across all but Northwest Illinois, and low temps in the mid 60's to upper 70's. Peak heat index values peaked in the upper 90's to upper 100's.
JP
(7:15PM - 8/25/21) A period of hot and humid conditions will continue across the region, impacting the state through this upcoming weekend. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.
Summary.... A large and elongated ridge is in place across the Central to Eastern US, which is helping to extend hot and humid conditions into the state and region for several day period of time, through this upcoming weekend. During this time, high temperatures will make it into the 90's for many areas across the state for several days during this period. Additionally of note will be the high heat index values, a product of high humidity/high dew points into the mid 70's to low 80's...Leading to heat index values into the 100-110 degree range for many areas for several days during this period.
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Forecast For Next Two Days...
Thursday, Aug 26th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the mid 60's to mid 70's. Heat index values will peak in the mid 90's to upper 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. Friday, Aug 27th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the mid 60's to mid 70's. Heat index values will peak in the mid 90's to upper 100's. Note: Rain/t'storm could temper the heat/humidity for some areas.
Recap Summary...
Monday, Aug 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across Central and Southern Illinois, and low temps in the low 60's to low 70's. Peak heat index values peaked in the low to upper 90's. Tuesday, Aug 24th Recap... High temperatures topped out in the low to upper 90's across the state, and low temps in the mid 60's to mid 70's. Peak heat index values peaked in the upper 90's to low 110's.
JP
(8:45PM - 8/24/21) A period of hot and humid conditions will continue across the region and will continue to impact the state through this upcoming weekend. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.
Summary.... A large and elongated ridge is in place across the Central to Eastern US, which is helping to extend hot and humid conditions into the state and region for several day period of time, through this upcoming weekend. During this time, high temperatures will make it into the 90's for many areas across the state for several days during this period. Additionally of note will be the high heat index values, a product of high humidity/high dew points into the mid 70's to low 80's...Leading to heat index values into the 100-110 degree range for many areas for several days during this period.
Forecast For Next Two Days...
Wednesday, Aug 25th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the upper 60's to upper 70's. Heat index values will be in the mid 90's to upper 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. Thursday, Aug 26th Forecast... High temperatures will range from the upper 80's to mid 90's across Central and Southern Illinois, with low temperatures ranging from the upper 60's to upper 70's. Heat index values will be in the mid 90's to upper 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. 
Recap Summary...
Monday, Aug 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across Central and Southern Illinois, and low temps in the low 60's to low 70's. Peak heat index values were in the low to upper 90's.
JP
(3:00PM - 8/24/21) Multiple disturbances moving through the region will bring severe t'storm potential to portions of the state, through tonight.
Summary... Several disturbances are moving through the Plains, Midwest and Great Lakes, along the northern edge of ridge in place across the Central and Eastern US. These disturbances will aide in bringing severe t'storm potential to portions of the state, through tonight.
Forecast...
This Afternoon - Tonight, Aug 24th... While the threat for severe t'storms for today previously looked very low, things have taken a quick turn, with severe t'storm risk looking more likely across Northern Illinois for this afternoon into tonight. A few complexes of rain and t'storms have been moving across Minnesota and Wisconsin this morning and this afternoon. An outflow boundary associated with these complexes has been moving southward across Southern Wisconsin, and will settle into far Northern Illinois this afternoon and evening. This outflow boundary will provide focus for isolated to scattered shower and t'storm development this afternoon and evening, with an isolated severe t'storm risk being possible. With that all said, the main focus will be for later this afternoon into early tonight, as a complex of severe t'storms has developed across Northern Iowa is expected to sweep east-southeastward across Southern Wisconsin and Northern Illinois. As this complex moves across the aforementioned areas, an environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,000-5,500J/KG, dew points in the low to upper 70's, modest shear, modest forcing, and good lapse rates of 6.5-7.5C. This environment will be supportive of upwards of an isolated to scattered severe t'storm risk (levels 1-3) across portions of Northern Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out. Below are the severe t'storm forecasts for this event. 
JP
(11:00AM - 8/24/21) A period of hot and humid conditions continues to settle in across region and will continue to impact the state through this upcoming weekend. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.
Summary.... A large and elongated ridge is in place across the Central to Eastern US, which is helping to extend hot and humid conditions into the state and region for several day period of time, through this upcoming weekend. During this time, high temperatures will make it into the 90's for many areas across the state for several days during this period. Additionally of note will be the high heat index values, a product of high humidity/high dew points into the mid 70's to low 80's...Leading to heat index values into the 100-110 degree range for many areas for several days during this period.
Forecast For Next Two Days...
Tuesday, Aug 24th Forecast... High temperatures will range from the low to mid 90's across the state, with low temperatures ranging from the low to upper 70's. Heat index values will be in the upper 90's to upper 100's. Note: Rain/t'storm could temper the heat/humidity for some areas. Wednesday, Aug 25th Forecast... High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the upper 60's to upper 70's. Heat index values will be in the mid 90's to upper 100's. Note: Rain/t'storm could temper the heat/humidity for some areas.
Recap Summary...
Monday, Aug 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across Central and Southern Illinois, and low temps in the low 60's to low 70's. Peak heat index values were in the low to upper 90's.
JP
(7:00PM - 8/13/21) A brief recap of the Sun-Thur, Aug 8-12th multi-day severe t'storm event that affected the state and region.
Recap Summary... Multiple disturbances moved through the region, Sunday Aug 8th through Thursday Aug 12th. These disturbances aided in multiple days featuring widespread severe t'storms across the state and region, including several tornadoes and widespread damaging winds across Northern Illinois.
Daily Recaps...
Sunday Afternoon - Sunday Night, Aug 8th... A large complex of t'storms that originated across Missouri spread northeastward across a large portion of the state, Sunday afternoon into Sunday night. Isolated to sporadic t'storms were severe with this complex, producing damaging winds. A few additional clusters of rain and t'storms moved across portions of the state Sunday night into early Monday morning, however none of this activity was severe. Monday Morning - Monday Night, Aug 9th... A large complex of t'storms that originated across Iowa on Sunday night, spread eastward across Northern Illinois Monday morning. No severe weather occurred with this activity. Additionally, a complex of rain and t'storms developed across Central and Southern Illinois Sunday night, which pushed across Central and Southern Illinois through Monday morning. No severe weather occurred with this activity. The main focus was Monday afternoon into early Monday night, as several supercell t'storms developed and moved southeastward across Northern Illinois. Scattered activity was severe, producing several tornadoes, and a few instances of damaging winds and hail. Tuesday Morning - Tuesday Night, Aug 10th... A large complex of severe t'storms developed across Southwest Wisconsin and Eastern Iowa Tuesday afternoon. This complex of severe t'storms then quickly moved eastward across Southern Wisconsin and Northern Illinois Monday, later Tuesday afternoon into early Tuesday night. This complex produced scattered severe t'storms with widespread damaging winds, causing widespread tree damage and power outages across Northern Illinois. Wednesday Morning - Wednesday Night, Aug 11th... A complex of rain and t'storms developed across Northwest Missouri, Southeast Iowa and Western Illinois early Wednesday morning. This complex quickly moved northeastward across portions of Northern and Central Illinois Wednesday morning. This complex produced sporadic to scattered severe t'storms with widespread damaging winds, causing widespread tree damage and power outages across portions of Northern Illinois. An additional round of widespread rain and t'storms developed Wednesday evening into Wednesday night across portions of Northern and Central Illinois. Isolated to sporadic t'storms were severe with this activity, producing some instances of damaging winds and hail. Thursday Morning - Thursday Night, Aug 12th... A broken complex of rain and t'storms was ongoing and further develops across Southern Iowa, Northern Missouri and Central Illinois Thursday morning. This complex grew further upscale, then pushing southward across Central and Southern Illinois, Thursday morning through Thursday night. Isolated to sporadic t'storms were severe with this activity, producing some instances of damaging winds and hail. Below are map representations of final forecasts for each day, as well as severe weather reports across the state and adjacent areas for each day.
JP
(10:00AM - 8/12/21) Several disturbances will continue to move through the region through tonight, bringing a continued severe t'storm potential to portions of the state, through tonight.
Summary... Several disturbances will continue to move across the Plains, Midwest and Great Lakes through tonight. These disturbances will bring severe t'storm potential to portions of the state, through tonight. With this update we have upgraded portions of the state to a level 2 severe t'storm risk for today/tonight.
Forecast...
This Morning - Tonight, Aug 12th... Areas of rain and t'storms have been ongoing across portions of Central Illinois this morning. Some of this activity is expected to continue, as it pushes eastward across Central Illinois into this afternoon. Another complex of rain and t'storms along the Missouri/Iowa/Illinois border area is also expected to push southeastward across Central Illinois, through this afternoon. Additionally, other areas of scattered showers and t'storms will develop across Iowa and Northern and Central Illinois this afternoon, which could form into clusters and spread southeast across much of the state this afternoon through tonight. An environment will be in place across the state supportive of a severe t'storm risk with this activity. This environment will feature high instability of 2,500-5,500J/KG, dew points in the upper 60's to low 80's, good shear, good forcing, and good lapse rates of 6.0-8.0C. This environment will be supportive of upwards of an isolated to sporadic severe t'storm risk (levels 1-2) across much of the state. Damaging winds, hail and an isolated tornado will be the severe weather threats. Below are the severe t'storm forecasts for this event. 
Recap...
Sunday Afternoon - Sunday Night, Aug 8th... A large complex of t'storms that originated across Missouri spread northeastward across a large portion of the state, Sunday afternoon into Sunday night. Isolated to sporadic t'storms were severe with this complex, producing damaging winds. A few additional clusters of rain and t'storms moved across portions of the state Sunday night into early Monday morning, however none of this activity was severe. Monday Morning - Monday Night, Aug 9th... A large complex of t'storms that originated across Iowa on Sunday night, spread eastward across Northern Illinois Monday morning. No severe weather occurred with this activity. Additionally, a complex of rain and t'storms developed across Central and Southern Illinois Sunday night, which pushed across Central and Southern Illinois through Monday morning. No severe weather occurred with this activity. The main focus was Monday afternoon into early Monday night, as several supercell t'storms developed and moved southeastward across Northern Illinois. Scattered activity was severe, producing several tornadoes, and a few instances of damaging winds and hail. Tuesday Morning - Tuesday Night, Aug 10th... A large complex of severe t'storms developed across Southwest Wisconsin and Eastern Iowa Tuesday afternoon. This complex of severe t'storms then quickly moved eastward across Southern Wisconsin and Northern Illinois Monday, later Tuesday afternoon into early Tuesday night. This complex produced scattered severe t'storms with widespread damaging winds, causing widespread tree damage and power outages across Northern Illinois. Wednesday Morning - Wednesday Night, Aug 11th... A complex of rain and t'storms developed across Northwest Missouri, Southeast Iowa and Western Illinois early Wednesday morning. This complex quickly moved northeastward across portions of Northern and Central Illinois Wednesday morning. This complex produced sporadic to scattered severe t'storms with widespread damaging winds, causing widespread tree damage and power outages across portions of Northern Illinois. An additional round of widespread rain and t'storms developed Wednesday evening into Wednesday night across portions of Northern and Central Illinois. Isolated to sporadic t'storms were severe with this activity, producing some instances of damaging winds and hail.
JP
(9:00PM - 8/11/21) Several disturbances will continue to move through the region through Thursday, bringing daily severe t'storm potential to portions of the state, through Thursday night.
Summary... Several disturbances will continue to move across the Plains, Midwest and Great Lakes through Thursday. These disturbances will bring severe t'storm potential to portions of the state, through Thursday night. With this update we have updated tonight's forecast based on current trends, as well as upgraded portions of the state to a level 2 severe t'storm risk for Thursday.
Forecast...
Tonight, Aug 11th... While a few isolated to scattered showers and t'storms have developed and pushed across northern Illinois this evening, with even a severe t'storm, things have been overall fairly quiet due to a cap in place aloft. However, with a frontal boundary sliding southward across the northern half of the state tonight and a strong low level jet in place, isolated to scatter showers and t'storms will continue to be possible through the night across portions of Northern and Central Illinois. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,000-5,000J/KG, dew points in the mid 70's to low 80's, good shear, good forcing, and high lapse rates of 7.0-8.0C. This environment will be supportive of upwards of an isolated to sporadic severe t'storm risk (levels 1-2) across Northern and Central Illinois. Damaging winds, hail and an isolated tornado will be the severe weather threats. Thursday Morning - Thursday Night, Aug 12th... Areas of rain and t'storms may be ongoing across portions of Northern and central Illinois Thursday morning. In the wake of this activity some clearing and destabilization should occur across the state. With additional disturbances moving through and a frontal boundary moving southward into and across the state, development of scattered showers and t'storms is expected Thursday afternoon across Northern and Central Illinois, and Iowa. This activity will likely congeal into multiple clusters or a loose line, and will then spread southeastward across much of the state, Thursday afternoon through Thursday night. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 2,500-4,500J/KG, dew points in the upper 60's to upper 70's, good shear, good forcing, and good lapse rates of 6.0-7.5C. This environment will be supportive of upwards of an isolated to sporadic severe t'storm risk (levels 1-2) across much of the state. Damaging winds, hail and an isolated tornado threat will be the severe weather threats. Below are the severe t'storm forecasts for this event.
Recap...
Sunday Afternoon - Sunday Night, Aug 8th... A large complex of t'storms that originated across Missouri spread northeastward across a large portion of the state, Sunday afternoon into Sunday night. Isolated to sporadic t'storms were severe with this complex, producing damaging winds. A few additional clusters of rain and t'storms moved across portions of the state Sunday night into early Monday morning, however none of this activity was severe. Monday Morning - Monday Night, Aug 9th... A large complex of t'storms that originated across Iowa on Sunday night, spread eastward across Northern Illinois Monday morning. No severe weather occurred with this activity. Additionally, a complex of rain and t'storms developed across Central and Southern Illinois Sunday night, which pushed across Central and Southern Illinois through Monday morning. No severe weather occurred with this activity. The main focus was Monday afternoon into early Monday night, as several supercell t'storms developed and moved southeastward across Northern Illinois. Scattered activity was severe, producing several tornadoes, and a few instances of damaging winds and hail. Tuesday Morning - Tuesday Night, Aug 10th... A large complex of severe t'storms developed across Southwest Wisconsin and Eastern Iowa Tuesday afternoon. This complex of severe t'storms then quickly moved eastward across Southern Wisconsin and Northern Illinois Monday, later Tuesday afternoon into early Tuesday night. This complex produced scattered severe t'storms with widespread damaging winds, causing widespread tree damage and power outages across Northern Illinois.
JP
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