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(7:30PM - 7/7/20) The region continues to be in the midst of a heat wave, with hot temperatures expected to continue for the next several days across the state...along with increasing humidity and heat indices.
Forecast Summary.... The main heat wave will continue to occur this week through Friday, with high temperatures across the state likely to range from the low to mid 90's on a daily basis. However, some t'storm activity may be likely for some areas from time to time, which could temper the heat in a few areas at times. Additionally, dew points will slowly increase mid to late week. The combination of high temperatures and increasing dew points will lead to higher humidity and heat index values, increasing to the mid 90's to low 100's for mid to late week. Low temperatures across the state will be in the mid 60's to mid 70's for more areas on a nightly basis, and possibly a bit warmer in urban metro areas Wednesday, July 8th Forecast... High temperatures ranging from the low to upper 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the low 90's to mid 100's across the state. An isolated and highly localized t'storm will be possible during the afternoon/evening across the state. Low temperatures in the low 60's to mid 70's across the state, possibly a bit warmer in urban metro areas. Thursday, July 9th Forecast... High temperatures ranging from the mid 80's to mid 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan and in areas affected by t'storms. Heat index values in the mid 80's to mid 100's across the state. Periods of showers and t'storms will be possible across the state Thursday into Thursday night. Low temperatures in the low 60's to mid 70's across the state.
Recap Summary...
Things kicked off last week, with widespread warm to hot temperatures across the state. High temperatures across the state this last week generally ranged from the mid 80's to mid 90's...the exception being areas that had been impacted with t'storm activity. The combination of high temperatures and high dew points lead to high humidity and heat index values for a few of the days. Heat index values in the upper 90's to mid 100's occurred across portions of Northern and Central Illinois for a few days, during the early to early to middle of this past week. From Saturday-Sunday July 4-5th, high temperatures ranged from the upper 80's to mid 90's, with low temperatures in mid 60's to mid 70's across the state. Lower dew points helped keep humidity and heat index values in check during this time. From Monday-Tuesday July 6-7th, high temperatures ranged from the low to mid 90's, with low temperatures in mid 60's to mid 70's across the state. Slowly increasing dew points lead to slightly higher humidity and heat index values during this time. With all of that said, we continue with an overall low heat wave impact for this period. 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. 
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(8:45PM - 7/6/20) The region continues to be in the midst of a heat wave, with hot temperatures expected to continue for the next several days across the state...along with increasing humidity and heat indices.
Forecast Summary.... The main heat wave will continue to occur this week through Friday, with high temperatures across the state likely to range from the low to upper 90's on a daily basis. However, some t'storm activity may be possible for some areas from time to time, which could temper the heat in a few areas at times. Additionally, dew points will slowly increase mid to late week. The combination of high temperatures and increasing dew points will lead to higher humidity and heat index values, increasing to the mid 90's to low 100's for mid to late week. Low temperatures across the state will be in the mid 60's to mid 70's for more areas on a nightly basis, and possibly a bit warmer in urban metro areas Tuesday, July 7th Forecast... High temperatures ranging from the low to mid 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the low 90's to upper 90's across the state. Low temperatures in the mid 60's to mid 70's across the state, possibly a bit warmer in urban metro areas. Wednesday, July 8th Forecast... High temperatures ranging from the low to upper 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the low 90's to low 100's across the state. Low temperatures in the low 60's to mid 70's across the state, possibly a bit warmer in urban metro areas.
Recap Summary...
Things kicked off last week, with widespread warm to hot temperatures across the state. High temperatures across the state this last week generally ranged from the mid 80's to mid 90's...the exception being areas that had been impacted with t'storm activity. The combination of high temperatures and high dew points lead to high humidity and heat index values for a few of the days. Heat index values in the upper 90's to mid 100's occurred across portions of Northern and Central Illinois for a few days, during the early to early to middle of this past week. From Saturday-Monday July 4-6th, high temperatures ranged from the upper 80's to mid 90's, with low temperatures in mid 60's to mid 70's across the state. Lower dew points helped keep humidity and heat index values in check during this time. With all of that said, we continue with an overall low heat wave impact for this period. However, we continue to monitor conditions for the potential for an upgrade to moderate heat wave impact. 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. 
(7:30PM - 7/5/20) A heat wave continues to settle in across the region, with hot temperatures and increasing humidity and heat indices expected across the state this week.
Things kicked off this past week, with widespread warm to hot temperatures across the state. High temperatures across the state this past week generally ranged from the mid 80's to mid 90's...the exception being areas that had been impacted with t'storm activity. The combination of high temperatures and high dew points lead to high humidity and heat index values for a few of the days. Heat index values in the upper 90's to mid 100's occurred across portions of Northern and Central Illinois for a few days, during the early to early to middle of this past week. For this upcoming week, the main heat wave will occur, with high temperatures across the state likely to range from the low to upper 90's on a daily basis. However, some t'storm activity may be possible for some areas from time to time, which could temper the heat in a few areas at times. Additionally, dew points will be on the rise early in the week, and then remain high mid through late week. The combination of high temperatures and high dew points will lead to high humidity and heat index values. Early week heat index values in the low 90's to low 100's are likely across the state, increasing to the mid 90's to mid 100's for mid to late week. Low temperatures across the state will be in the mid 60's to mid 70's for more areas on a nightly basis, and likely warmer in the mid 70's to around 80 for more urban areas, such as Chicago. There are signs that the heat could persist for portions of the state beyond this week, through next weekend (11/12th), and potentially beyond into the following week. However, confidence at that range greatly decreases, thus will not go too far into that potential for now.
Monday, July 6th Forecast...
High temperatures ranging from the upper 80's to mid 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the upper 80's to upper 90's across the state. Low temperatures in the low 60's to mid 70's across the state. Tuesday, July 7th Forecast... High temperatures ranging from the low to upper 90's across the state. Heat index values in the low 90's to low 100's across the state. Low temperatures in the mid 60's to mid 70's across the state. With all of that said, for now an overall low heat wave impact is expected. However, as conditions for this week become more clear, an upgrade to moderate impact is likely. 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. 
(1:45AM - 7/5/20) A heat wave continues to settle in across the region, with hot temperatures and increasing humidity and heat indices expected across the state this week.
Things kicked off this past week, with widespread warm to hot temperatures across the state. High temperatures across the state this past week generally ranged from the mid 80's to mid 90's...the exception being areas that had been impacted with t'storm activity. The combination of high temperatures and high dew points lead to high humidity and heat index values for a few of the days. Heat index values in the upper 90's to mid 100's occurred across portions of Northern and Central Illinois for a few days, during the early to early to middle of this past week. For this upcoming week, the main heat wave will occur, with high temperatures across the state likely to range from the low to upper 90's on a daily basis. However, some t'storm activity may be possible for some areas from time to time, which could temper the heat in a few areas at times. Additionally, dew points will be on the rise early in the week, and then remain high mid through late week. The combination of high temperatures and high dew points will lead to high humidity and heat index values. Early week heat index values in the low 90's to low 100's are likely across the state, increasing to the mid 90's to mid 100's for mid to late week. Low temperatures across the state will be in the mid 60's to mid 70's for more areas on a nightly basis, and likely warmer in the mid 70's to around 80 for more urban areas, such as Chicago. There are signs that the heat could persist beyond this upcoming week, through next weekend (11/12th), and potentially beyond into the following week. However, confidence at that range greatly decreases, thus will not go too far into that potential for now.
Sunday, July 5th Forecast...
High temperatures ranging from the upper 80's to mid 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the upper 80's to upper 90's across the state. Low temperatures in the low 60's to low 70's across the state. Monday, July 6th Forecast... High temperatures ranging from the low to mid 90's across the state. Heat index values in the low to upper 90's across the state. Low temperatures in the mid 60's to mid 70's across the state. With all of that said, for now an overall low heat wave impact is expected. However, as conditions for this upcoming week become more clear, an upgrade to moderate impact is likely. 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. 
(11:15PM - 7/3/20) 4th of July is upon us, with hot and mostly clear conditions expected across the state. High temperatures on Saturday will be in the upper 80's to mid 90's across mush of the state, with heat index values in the upper 80's to upper 90's expected. Mostly clear to partly cloudy skies are expected, through there will be the chance for an isolated t'storm across the state Saturday afternoon and evening...However, this threat is very low and will be very isolated. Low temperatures Saturday night will be in the mid 60's to low 70's across the state.
(6:00PM - 7/3/20) As was mentioned in a post from earlier this week, a warm/hot and deep summer weather pattern has settled into the region. This pattern is expected to continue through early to mid July, and will feature the first heat wave of the season for the state.
Things have kicked off this week, with widespread warm to hot temperatures across the state. High temperatures across the state this week have generally ranged from the mid 80's to mid 90's...the exception being areas that had been impacted with t'storm activity. The combination of high temperatures and high dew points lead to high humidity and heat index values for a few of the days. Heat index values of 100-106 occurred across portions of Northern and Central Illinois for a few days, early to middle of this ending week.
Looking forward...Increasingly hot temperatures are expected this weekend across the state, with high temperatures in the upper 80's to mid 90's expected for most areas. An isolated t'storm will be possible anywhere across the state each day, which could temper heat for a few areas at times. Dew points in the low 60's to low 70's, combined with the high temperatures, will lead to heat index values in the upper 80's to upper 90's. Low temperatures across the state will range from the low 60's to low 70's on a nightly basis.
For the upcoming week, the main heat wave will occur, with high temperatures across the state likely to range from the low to upper 90's on a daily basis. However, some t'storm activity may be possible for some areas from time to time, which could temper the heat in a few areas at times. Additionally, dew points will be on the rise early in the week, and then remain high mid through late week. The combination of high temperatures and high dew points will lead to high humidity and heat index values. Early week heat index values in the low 90's to low 100's are likely across the state, increasing to the mid 90's to upper 100's for mid to late week. Low temperatures across the state will be in the mid 60's to mid 70's for more areas on a nightly basis, and likely warmer in the mid 70's to around 80 for more urban areas, such as Chicago. There are signs that the heat could persist beyond this upcoming week, through next weekend (11/12th). However, confidence at that range greatly decreases, thus will not go too far into that potential for now.
Saturday, July 4th Forecast...
High temperatures ranging from the low 80's to low 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the upper 80's to upper 90's across the state. Low temperatures in the low 60's to low 70's across the state. Sunday, July 5th Forecast... High temperatures ranging from the low 80's to mid 90's across the state, with cooler temps expected in Northeast Illinois near Lake Michigan. Heat index values in the upper 80's to upper 90's across the state. Low temperatures in the low 60's to low 70's across the state. With all of that said, for now an overall low heat wave impact is expected. However, as conditions for this upcoming week become more clear, an upgrade to moderate impact is likely. 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. 
(6:45PM - 6/29/20) A warm/hot, humid and at times stormy pattern is likely to continue deep into July across the region.
The past few days a new pattern has begun to set in across the country, and has increasing support to stay in place well into July, potentially even as we eventually push into mid-July. This pattern will feature a ridge across the Inter-Mountain West and Central US, with a trough across the far Northwest and far Northeast. 
This new pattern will allow warm/hot and humid conditions to the be norm across the state during this period. High temperatures the past few days, and for the foreseeable future, will be generally in the mid-80's to mid 90's across the state on a daily basis. Also, humid conditions are expected, with dew points likely to be in the upper 60's to upper 70's on a daily basis. The temperature and dew point combination will lead to high humidity and hit heat index values, likely reaching the mid 90's to mid 100's on several occasions. In addition to the heat and humidity, periods of stormy conditions will also be possible. The first stormy period kicked off this past weekend, and will likely continue into Wednesday. Beyond this time, any small/subtle waves that top the ridge in place or get trapped under the ridge, may provide stormy conditions at times. While no widespread severe t'storm or flooding activity is expected at this time, this deep summer pattern will support localized flooding during any stormy periods and a stray severe t'storm at times.
(11:45AM - 6/27/20) Multiple disturbances moving through the region through today, will continue to bring a severe t'storm threat to portions of the state through tonight.
This afternoon - tonight... Weakening clusters of showers and t'storms have been ongoing this morning across Central and Southern Illinois, and adjacent states. Some of this activity has re-generated with some additional new scattered showers and t'storms having developed as well. Additional new scattered showers and t'storms are expected to develop across the state and adjacent states through the day. All of this activity, in the form of several clusters, will move across Central and Southern Illinois, this afternoon into tonight. The environment expected to be in place will feature low to moderate instability, good to great moisture, marginal shear and marginal forcing. This will lead to upwards of a minimal (level 1) severe t'storm risk across Central and Southern Illinois. Damaging winds and large hail will be the main threats, though an isolated tornado can't be ruled out.
Friday - Friday night recap...
Clusters of showers and t'storms spread across Northern Illinois, Friday morning into Friday afternoon. In the wake of this early activity, some clearing and destabilization occurred. New development of scattered showers and t'storms occurred Friday afternoon, across portions of Southern Wisconsin, Iowa and Northwest Illinois. This activity grew upscale into multiple lines/clusters, which pushed southeastward across Northern Illinois late Friday afternoon into Friday night. Scattered to numerous severe t'storms occurred with this activity, with damaging winds having been the main threat. This activity continued to spread across portions of Northern and Central Illinois in a weakening phase into Friday night. Below is the severe t'storm forecast for this afternoon - tonight. 
(12:00PM - 6/26/20) Multiple disturbances are expected to move through the region today and Saturday, bringing a severe t'storm threat to portions of the state each day.
Today - tonight recap... Clusters of showers and t'storms spread across Northern Illinois, this morning into this afternoon. In the wake of this early activity, some clearing and destabilization occurred. New development of scattered showers and t'storms occurred this afternoon, across portions of Southern Wisconsin, Iowa and Northwest Illinois. This activity grew upscale into multiple lines/clusters, which pushed southeastward across Northern Illinois late this afternoon into tonight. Scattered severe t'storms occurred with this activity, with damaging winds having been the main threat. This activity will continue to spread southeastward across portions of Northern and Central Illinois tonight. An isolated severe t'storm will be possible, with damaging winds being the main threat.
Saturday - Saturday night...
A complex situation is likely for Saturday... Weakening clusters of showers and t'storms will be ongoing Saturday morning across portions of Central and Southern Illinois, and adjacent states. Some of this activity may re-generate during the afternoon, with additional new scattered showers and t'storms likely to develop across Central and Southern Illinois, and adjacent states as well. This activity, in the form of several clusters, will then move across Central and Southern Illinois, Saturday afternoon into Saturday night. The environment expected to be in place will feature low instability, good moisture, decent shear and decent forcing. This will lead to upwards of a minimal (level 1) severe t'storm risk across Central and Southern Illinois. Damaging winds and large hail will be the main threats, though an isolated tornado can't be ruled out. Trends will continue to be monitored for the potential for an upgrade in severe t'storms probabilities in future updates. Below is the severe t'storm forecast for Saturday - Saturday night. 
(12:00PM - 6/26/20) Multiple disturbances are expected to move through the region today and Saturday, bringing a severe t'storm threat to portions of the state each day.
This afternoon - tonight... Clusters of showers and t'storms have been spreading across Northern and portions of Central Illinois this morning. In the wake of this early activity, some clearing and destabilization is expected to occur this afternoon. New development of scattered showers and t'storms will occur this afternoon, across portions of Southern Wisconsin, Iowa and Northwest Illinois. This activity is likely to grow upscale into multiple lines/clusters, pushing southeastward across Northern and eventually Central Illinois, this afternoon into tonight. The environment expected to be in place will feature moderate instability, good moisture, good shear and good forcing. This will lead to upwards of a limited (level 2) to elevated (level 3) severe t'storm risk across Northern and portions of Central Illinois. Damaging winds will be the greatest threat, though large hail and an isolated tornado can't be ruled out. Trends are being monitored for the potential for an upgrade in severe t'storms probabilities. Should this be needed, a special full update will be provided.
Saturday - Saturday night...
A complex situation is likely for Saturday... Weakening clusters of showers and t'storms will be ongoing Saturday morning across portions of Central and Southern Illinois, and adjacent states. Some of this activity may re-generate during the afternoon, with additional new scattered showers and t'storms likely to develop across Central and Southern Illinois, and adjacent states as well. This activity, in the form of several clusters, will then move across Central and Southern Illinois, Saturday afternoon into Saturday night. The environment expected to be in place will feature low instability, good moisture, decent shear and decent forcing. This will lead to upwards of a minimal (level 1) severe t'storm risk across Central and Southern Illinois. Damaging winds and large hail will be the main threats, though an isolated tornado can't be ruled out. Trends will continue to be monitored for the potential for an upgrade in severe t'storms probabilities in future updates. Below is the severe t'storm forecast for this afternoon - tonight and Saturday - Saturday night.
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