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(10:00PM - 9/6/20) A storm system is expected to move through the region on Sunday, bringing a low end threat for severe t'storms to Northern and portions of Central Illinois.
Summary... A complex of scattered showers and t'storms is expected to spread across Northern and portions of Central Illinois, Sunday morning into early Sunday afternoon. A marginal environment will be in place, which will support an isolated severe t'storm threat, with damaging winds and large hail being the main threats. In the wake of this activity, the amount of clearing and destabilization that occurs is in question, and thus casts doubt on the secondary potential for Sunday afternoon into Sunday night. At this time it appears possible that additional isolated to scattered showers and t'storms will develop Sunday afternoon along an advancing cold front, across portions of Wisconsin, Iowa and Northwest Illinois. This activity will then push east-southeast across portions of Northern Illinois, posing an isolated severe t'storm threat late Sunday afternoon into Sunday night. An environment in place will feature low to moderate instability, moderate moisture, good shear and good forcing. Upwards of a minimal severe t'storm threat is expected across portions of Northern Illinois, during both rounds of activity on Sunday. Damaging winds, large hail and an isolated tornado will be the main threats. Below is the severe t'storm forecast for Sunday morning - Sunday night. 
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(10:45AM - 9/5/20) A storm system is expected to move through the region on Sunday, bringing a low end threat for severe t'storms to Northern and portions of Central Illinois.
Summary... A complex of scattered showers and t'storms is expected to spread across Northern and portions of Central Illinois Sunday morning. A marginal environment will be in place, which could support an isolated severe t'storm, with damaging winds and large hail being the main threats. In the wake of this activity, the amount of clearing and destabilization that occurs is in question, and thus casts doubt on the potential for Sunday afternoon into Sunday night. At this time it appears possible that additional isolated to scattered showers and t'storms are expected to develop Sunday afternoon along an advancing cold front, across portions of Wisconsin, Minnesota, Iowa and Northwest Illinois. This activity will then push southeast across Northern and portions of Central Illinois, late Sunday afternoon into Sunday night. An environment in place will feature low to moderate instability, moderate moisture, good shear and good forcing. Upwards of a minimal severe t'storm threat is expected across portions of Northern Illinois. Damaging winds, large hail and an isolated tornado will be the main threats. Below is the severe t'storm forecast for Sunday morning - Sunday night. 
(9:45PM - 9/4/20) A storm system is expected to move through the region on Sunday, bringing a low end threat for severe t'storms to Northern Illinois.
Summary... A complex of scattered showers and t'storms is expected to spread across Northern and portions of Central Illinois Sunday morning. In the wake of this activity, some clearing and destabilization will occur. Additional scattered showers and t'storms are expected to develop Sunday afternoon along an advancing cold front, across portions of Wisconsin, Minnesota, Iowa and Northwest Illinois. This activity will then push southeast across Northern and portions of Central Illinois, late Sunday afternoon into Sunday night. An environment in place will feature low to moderate instability, moderate moisture, good shear and good forcing. Upwards of a minimal severe t'storm threat is expected across portions of Northern Illinois. Damaging winds, large hail and an isolated tornado will be the main threats. Below is the severe t'storm forecast for Sunday morning - Sunday night. 
(3:30PM - 9/1/2020) Summer 2020 ended up as the hottest summer on record for Chicago, with an average temperature of 76.7 degrees. Summer is considered June 1st - August 31st. The average temperature takes into account high and low temperatures from each summer month (June/July/August), which is averaged out to get the overall summer average temperature.
In addition to the summer record...June 2020 finished tied for the 6th warmest June on record, July 2020 finished as the 4th warmest July on record, and August 2020 finished tied for the 6th warmest August on record. There were 30 days which featured a high temperature of 90 degrees of higher (31 total this year), with the highest temperature of the summer being 97 degrees on August 24th. While there were many hot days, including a few heat waves, extreme heat was fairly limited overall...with the record for this summer being mostly attributed to consistently warm temperatures, both day and night. Looking into a comparison of this summer compared to the other summers on the top 5 list...Most of the other summers featured more extreme heat, including days with temperatures into the 100's. What occurred this summer shows that a summer with consistent warmth and some heat can be just as significant statistically as a summer that has more significant bouts of extreme heat.
(Side note: Some will notice that 1988 did not feature a top 5 hottest summer. Summer 1988 featured several bouts of extreme heat, including numerous days with high temperatures into the 100's. However, there were also several bouts of cooler (Even below average) temperatures throughout the summer. Additionally, a significant drought was in place, with moisture and high humidity lacking. This aided in cool overnight low temperatures, well below average at times, which skewed the overall average summer temperature much lower than it could have been. 
(1:30PM - 8/31/20) A heat wave spanning over several days impacted portions of the region and state, August 23-28th. This heat wave brought multiple days with high temperatures well into the 90's across the state...Most notably across much of Northern and portions of Northern Illinois, where several days with high temperatures into the mid to upper 90's occurred.
Overview.... A strong ridge that had been in place prior to this period across the Inter-Mountain West and Plains pushed eastward, on into the Central US. After shifting eastward, the ridge was in place across the Central US for much of this period, bringing hot temperatures to much of the state and region. High temperatures were widespread into the 90's across the state through during this period...Most notably across much of Northern and portions of Northern Illinois, where several days with high temperatures into the mid to upper 90's occurred. Humidity levels were generally moderate during the duration of this period, ranging from the upper 80's to low 100's for most areas. Near daily record high and low temperatures occurred for some areas. 
Recap Summary...
Saturday, August 22nd Recap... High temperatures topped out in the upper 80's to low 90's across Northern and Central Illinois, to the mid to upper 80's across Southern Illinois. Heat index values were low, and not much higher than the actual air temperatures. Low temperatures in the low 60's to low 70's were common across the state. Sunday, August 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values were low, and not much higher than the actual air temperatures. Low temperatures in the low 60's to low 70's were common across the state. A few isolated showers and t'storm occurred across portions of Northern and Central Illinois, which tempered the heat a bit for some areas. Monday, August 24th Recap... High temperatures topped out in the mid to upper 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index values were moderate, generally in the low 90's to low 100's. Low temperatures in the mid 60's to low 70's were common across the state. Tuesday, August 25th Recap... High temperatures topped out in the low to upper 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. A back-door front kept portions of Northeast Illinois a bit cooler. Heat index values were moderate, in the low 90's to low 100's. Low temperatures in the mid 60's to mid 70's were common across the state. Wednesday, August 26th Recap... High temperatures topped out in the low to mid 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index were moderate, in the low to upper 90's. Low temperatures in the upper 60's to mid 70's were common across the state. Thursday, August 27th Forecast... High temperatures topped out in the low to mid 90's across Northern and Central Illinois, to the mid 80's to low 90's across Southern Illinois. Heat index values were moderate, in the low to upper 90's across much of the state. Low temperatures in the upper 60's to upper 70's were common across the state. Friday, August 28th Forecast... High temperatures topped out in the upper 80's to mid 90's across Northern and Central Illinois. Heat index values were moderate, in the low to upper 90's. Low temperatures in the mid 60's to upper 70's were common across Northern and Central Illinois as well. Across Southern Illinois, cooler high and low temperatures were seen, as the remnants of Hurricane Laura affected the area with clouds/rain/t'storms.
(11:45AM - 8/28/20) A storm system moving through the region today will bring a low end threat for severe t'storms to much of Northern and Central Illinois. Additionally, the remnants of Hurricane Laura will bring a low end severe t'storm threat across portions of Southern Illinois.
Summary... A large complex of showers and t'storms has been weakening as it moves across portions of Minnesota, Wisconsin and Iowa this morning. This complex will leave a lot of debris activity in its wake, thus limiting later development along the cold front moving across the same areas. Isolated to scattered showers and t'storms will be possible this afternoon and evening across Northern and Central Illinois, well ahead of the approaching cold front. Additional isolated to scattered showers and t'storms are still expected to also develop along the cold front this afternoon, moving across portions of Northern and Central Illinois later this afternoon into early tonight. An environment in place will feature moderate instability, high moisture, good shear and good forcing. Upwards of a minimal severe t'storm threat is expected across much Northern and Central Illinois, with damaging winds, large hail and an isolated tornado being the main threats. It should be noted that none of the activity today into tonight across Northern and Central Illinois will be widespread, meaning a lot of areas that have been dry and looking for some good rains will miss out.
Further south, the remnants of Hurricane Laura are tracking south of the Ohio River today. This will be close enough to pose a very low end severe t'storm threat across far Southeast Illinois. Damaging winds and an isolated tornado will be the main threats. A localized flood threat will also exist, with localized rainfall totals of 1.00"+ possible. Outside of severe t'storm and general t'storm potential, breezy conditions are expected, with wind gusts of 20-40mph being possible.
Below is the severe t'storm forecast for this afternoon - tonight. 
(9:45PM - 8/27/20) A storm system is expected to move through the region on Friday, bringing a low end threat for severe t'storms to much of Northern and Central Illinois. Additionally, the remnants of Hurricane Laura will bring a low end severe t'storm threat across portions of Southern Illinois.
Summary... A few isolated to scattered showers and t'storms may be possible Friday morning and afternoon across portions of Northern and Central Illinois. However, this isolated to scattered activity will not be the main focus, with a good deal of clearing and destabilization likely occur across much of the state on Friday. The main focus will be the development of scattered showers and t'storms Friday afternoon, along a cold front moving across portions of Minnesota, Iowa and Wisconsin. This activity is expected to push east-southeast, into and across portions of Northern and Central Illinois later Friday afternoon into Friday night. An environment in place will feature moderate instability, high moisture, good shear and good forcing. Upwards of a minimal to limited severe t'storm threat is expected across much Northern and Central Illinois, with damaging winds, large hail and an isolated tornado being the main threats.
Further south, the remnants of Hurricane Laura are expected to track south of the Ohio River on Friday. This will be close enough to pose a low end severe t'storm threat across far Southern Illinois. Damaging winds and an isolated tornado will be the main threats. A localized flood threat will also exist, with localized rainfall totals of 1.00"+ possible. Outside of severe t'storm and general t'storm potential, breezy conditions are expected, with wind gusts of 25-40mph being possible.
Below is the severe t'storm forecast for Friday morning - Friday night. 
(8:30PM - 8/27/20) A heat wave continues to to affect the state and region, and will continue through Friday. Hot temperatures will continue to be expected during this time.
Summary.... A ridge continues to be in place across the Central US, and will continue to be through Friday. This ridge has been and will continue to bring hot temperatures to much of the state and region. High temperatures into the 90's will continue to be expected across portions of the state through Friday. 
Forecast For Tomorrow...
Friday, August 28th Forecast... High temperatures will range from the upper 80's to mid 90's across Northern and Central Illinois. Heat index values will be moderate, in the low to upper 90's. Low temperatures in the mid 60's to upper 70's will be common across Northern and Central Illinois as well. Across Southern Illinois, cooler high and low temperatures will be expected, as the remnants of Hurricane Laura affect the area.
Recap Summary...
Saturday, August 22nd Recap... High temperatures topped out in the upper 80's to low 90's across Northern and Central Illinois, to the mid to upper 80's across Southern Illinois. Heat index values were low, and not much higher than the actual air temperatures. Low temperatures in the low 60's to low 70's were common across the state. Sunday, August 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values were low, and not much higher than the actual air temperatures. Low temperatures in the low 60's to low 70's were common across the state. A few isolated showers and t'storm occurred across portions of Northern and Central Illinois, which tempered the heat a bit for some areas. Monday, August 24th Recap... High temperatures topped out in the mid to upper 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index values were moderate, generally in the low 90's to low 100's. Low temperatures in the mid 60's to low 70's were common across the state. Tuesday, August 25th Recap... High temperatures topped out in the low to upper 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. A back-door front kept portions of Northeast Illinois a bit cooler. Heat index values were moderate, in the low 90's to low 100's. Low temperatures in the mid 60's to mid 70's were common across the state. Wednesday, August 26th Recap... High temperatures topped out in the low to mid 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index were moderate, in the low to upper 90's. Low temperatures in the upper 60's to mid 70's were common across the state. Thursday, August 27th Forecast... High temperatures topped out in the low to mid 90's across Northern and Central Illinois, to the mid 80's to low 90's across Southern Illinois. Heat index values were moderate, in the low to upper 90's across much of the state. Low temperatures in the upper 60's to upper 70's were common across the state.
(11:45AM - 8/27/20) A storm system is expected to move through the region on Friday, bringing a low end threat for severe t'storms to much of Northern and Central Illinois. Additionally, the remnants of Hurricane Laura will bring a low end severe t'storm threat across portions of Southern Illinois.
Summary... A few isolated to scattered showers and t'storms may be ongoing Friday morning across portions of Northern Illinois. A good deal of clearing and destabilization will occur across much of the state on Friday. Scattered showers and t'storms are likely to develop Friday afternoon, along a cold front moving across portions of Minnesota, Iowa and Wisconsin.This activity is expected to push east-southeast, into and across portions of Northern and Central Illinois later Friday afternoon into Friday night. An environment in place will feature moderate instability, high moisture, good shear and good forcing. Upwards of a minimal to limited severe t'storm threat is expected across much Northern and Central Illinois, with damaging winds, large hail and an isolated tornado being the main threats.
Further south, the remnants of Hurricane Laura are expected to track south of the Ohio River on Friday. This will be close enough to pose a low end severe t'storm threat across far Southern Illinois. Damaging winds and an isolated tornado will be the main threats. Outside of severe t'storm and general t'storm potential, breezy conditions are expected, with wind gusts of 25-40mph being possible.
Below is the severe t'storm forecast for Friday morning - Friday night. 
(7:30PM - 8/26/20) A heat wave continues to to affect the state and region, and will continue through Friday. Hot temperatures will continue to be expected during this time, with the potential for some records to fall.
Summary.... A strong ridge that had been in place across the Inter-Mountain West and Plains has shifted eastward, on into the Central US. This ridge will continue to be in place through the end of this week, bringing hot temperatures to much of the state and region. High temperatures will be widespread in the low to upper 90's across the state through Friday, with some areas in Northern and Central Illinois possibly nearing 100 a few of the days. Daily record high temperatures will be in jeopardy for some areas each day as well.
Forecast For Next Two Days...
Thursday, August 27th Forecast... High temperatures will range from the low to mid 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index values will be moderate, in the low to upper 90's. Low temperatures in the upper 60's to upper 70's will be common across the state. Friday, August 28th Forecast... High temperatures will range from the upper 80's to low 90's across much of the state, the exception being Southern Illinois where the remnants of Hurricane Laura will keep temperatures a bit cooler. Heat index values will be moderate, in the low to upper 90's across much of the state, once again the exception being Southern Illinois. Low temperatures in the mid 60's to mid 70's will be common across the state.
Recap Summary...
Saturday, August 22nd Recap... High temperatures topped out in the upper 80's to low 90's across Northern and Central Illinois, to the mid to upper 80's across Southern Illinois. Heat index values were low, and not much higher than the actual air temperatures. Low temperatures in the low 60's to low 70's were common across the state. Sunday, August 23rd Recap... High temperatures topped out in the upper 80's to mid 90's across the state. Heat index values were low, and not much higher than the actual air temperatures. Low temperatures in the low 60's to low 70's were common across the state. A few isolated showers and t'storm occurred across portions of Northern and Central Illinois, which tempered the heat a bit for some areas. Monday, August 24th Recap... High temperatures topped out in the mid to upper 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index values were moderate, generally in the low 90's to low 100's. Low temperatures in the mid 60's to low 70's were common across the state. Tuesday, August 25th Recap... High temperatures topped out in the low to upper 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. A back-door front kept portions of Northeast Illinois a bit cooler. Heat index values were moderate, in the low 90's to low 100's. Low temperatures in the mid 60's to mid 70's were common across the state. Wednesday, August 26th Recap... High temperatures topped out in the low to mid 90's across Northern and Central Illinois, to the upper 80's to mid 90's across Southern Illinois. Heat index were moderate, in the low to upper 90's. Low temperatures in the upper 60's to mid 70's were common across the state. |
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