(11:00AM - 7/29/21) A storm system continuing to move through the region today will bring severe t'storm potential to portions of the state through Thursday night.

Summary...
A storm system moved from the Northern Plains into the Midwest on Wednesday, and will push eastward across the Great Lakes today. This storm system will bring severe t'storm potential to portions of the state, through tonight.

​Forecast...
This Morning - Tonight, July 29th...
Areas of rain and t'storms have been ongoing this morning across portions of Northern and Central Illinois. Some of this activity may regenerate through the day across Central Illinois, with additional development also likely to occur along a southward advancing cold front that will be moving across Central Illinois today.  All of the activity will move southward through the day today and into tonight, across Central and Southern Illinois. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,500-5,500J/KG, dew points in the low to upper 70's, modest shear, modest forcing, and modest 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 portions of Central and Southern 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.

​Recap...
Wednesday Afternoon - Wednesday Night, July 28th...
A large complex of t'storms that originated up across Minnesota and Wisconsin moved across Northern Illinois Wednesday night into early Thursday morning. Sporadic t'storms were severe with this complex, producing damaging winds.

JP

(11:45PM - 7/28/21) A period of hot and humid conditions continues across the region and will continue to impact the state through Thursday. Hot temperatures, high humidity and high heat indices have occurred during this period.

Summary....
A large ridge in place across the US has helped to extend widespread hot and humid conditions into the state and region over the past several days.

Forecast For Next Two Days...
​Thursday, June 29th 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 mid 70's across Central and Southern Illinois. Heat index values will be in the mid 90's to upper 100's across Central and Southern Illinois.

​Recap Summary...
Friday, July 23rd Recap...
High temperatures topped out in the mid 80's to low 90's across the state, and low temps in the mid 60's to low 70's. Peak heat index values were in the upper 80's to upper 90's.

Saturday, July 24th Recap...
High temperatures topped out in the upper 80's to mid 90's across the state, and low temps in the low 60's to mid 70's. Peak heat index values were in the mid 90's to mid 100's.

Sunday, July 25th Recap...
High temperatures topped out in the mid 80's to mid 90's across the state, and low temps in the upper 50's to low 70's. Peak heat index values were in the mid 80's to upper 90's.

Monday, July 26th Recap...
High temperatures topped out in the mid 80's to mid 90's across the state, and low temps in the upper 50's to low 70's. Peak heat index values were in the mid 80's to upper 90's.

Tuesday, July 27th Recap...
High temperatures topped out in the mid 80's to mid 90's across the state, and low temps in the low 60's to low 70's. Peak heat index values were in the mid 80's to upper 90's.

JP

(11:00PM - 7/28/21) A storm system moving through the region through Thursday will bring severe t'storm potential to portions of the state,tonight through Thursday night.

Summary...
A storm system moved from the Northern Plains into the Midwest today, and will push eastward across the Great Lakes on Thursday. This storm system will bring severe t'storm potential to portions of the state, tonight through Thursday night. With this update we have adjusted tonight's forecast based on real time observational trends, and little to no change was needed for Thursday's forecast.

Forecast...
This Evening - Tonight, July 28th...
As expected, widespread showers and t'storms developed late this afternoon across portions of Eastern Minnesota and Northern Wisconsin. This activity congealed into a loose complex, and has been pushing southward across Northern and Central Wisconsin this evening and early tonight. This complex is expected to continue to move southward, eventually pushing into and across Northern Illinois overnight tonight and into early Thursday morning. An environment is in place that is supportive of a severe t'storm risk with this activity. This environment features high instability of 3,500-5,500J/KG, dew points in the mid to upper 70's, high shear, ample forcing, and high lapse rates of 7.0-8.5C. This environment will be supportive of upwards of an isolated to widely scattered severe t'storm risk (levels 1-2) across portions of Northern Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out.
​
Thursday Morning - Thursday Night, July 29th...
Clusters of rain and t'storms from tonight will ongoing Thursday morning across portions of Northern Illinois. In the wake of this early day activity, a new round of scattered showers and t'storms is expected to develop Thursday afternoon along a cold front moving southward across Central Illinois. After development, this activity will push southward across portions of Central and Southern Illinois Thursday afternoon into 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 3,500-5,500J/KG, dew points in the low to upper 70's, modest shear, modest forcing, and modest lapse rates of 5.5-6.5C. This environment will be supportive of upwards of an isolated severe t'storm risk (level 1) 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

(9:30AM - 7/28/21) A storm system moving through the region today and Thursday will bring severe t'storm potential to portions of the state, this evening through Thursday night.

Summary...
A storm system will move from the Northern Plains into the Midwest today, and will then push eastward across the Great Lakes on Thursday. This storm system will bring severe t'storm potential to portions of the state, this evening through Thursday night. Little to no change was needed to forecasts with this update.

​Forecast...
This Evening - Tonight, July 28th...
Areas of scattered showers and t'storm have been ongoing across portions of Northern Illinois this morning, and this activity may continue into the afternoon for some areas. The overall severe t'storm risk with this activity is low, but wouldn't rule out an isolated severe t'storm being possible. The main focus will be this afternoon and evening across portions of Minnesota and Wisconsin, where of scattered showers and t'storms are expected to develop in the vicinity of a storm system advancing southeastward. This activity is likely to grow upscale into one or more clusters, which will then push southward across Wisconsin, Western Michigan, Northern Indiana and Northeast Illinois from this evening through early Thursday morning. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,500-5,500J/KG, dew points in the low to upper 70's, high shear, ample forcing, and high lapse rates of 7.0-8.5C. This environment will be supportive of upwards of an isolated to widely scattered severe t'storm risk (levels 1-2) across portions of Northern Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out.
​
Thursday Morning - Thursday Night, July 29th...
Clusters of rain and t'storms from Wednesday night may be ongoing Thursday morning across portions of Northern Illinois. In the wake of this early day activity, a new round of scattered showers and t'storms is expected to develop Thursday afternoon along a cold front moving southward across Central Illinois. After development, this activity will push southward across portions of Central and Southern Illinois, Thursday afternoon into 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 3,500-5,500J/KG, dew points in the low to upper 70's, modest shear, modest forcing, and modest lapse rates of 5.5-6.5C. This environment will be supportive of upwards of an isolated severe t'storm risk (level 1) 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

(10:30PM - 7/27/21) A storm system is expected to move through the region on Wednesday and Thursday, bringing severe t'storm potential to portions of the state Wednesday afternoon through Thursday night.

Summary...
A storm system will move across the Northern Plains tonight, and will push eastward across the Midwest and Great Lakes on Wednesday and Thursday. This storm system will bring severe t'storm potential to portions of the state, Wednesday afternoon through Thursday. Little to no change was needed to forecasts with this update.

​Forecast...
Wednesday Afternoon - Wednesday Night, July 28th...
While a few isolated showers or t'storms will be possible Wednesday morning into Wednesday afternoon, the main focus will be Wednesday evening through early Thursday morning. Development of scattered showers and t'storms is expected Wednesday afternoon across portions of Minnesota and Wisconsin, in the vicinity of a storm system advancing southeastward. This activity is likely to grow upscale into one or more clusters, which will then push southward across Wisconsin, Western Michigan, Northern Indiana and Northeast Illinois from Saturday evening through early Thursday morning. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,500-5,500J/KG, dew points in the low to upper 70's, high shear, ample forcing, and high lapse rates of 7.0-8.5C. This environment will be supportive of upwards of an isolated to widely scattered severe t'storm risk (levels 1-2) across portions of Northern Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out.
​
Thursday Morning - Thursday Night, July 29th...
Clusters of rain and t'storms from Wednesday night may be ongoing Thursday morning across portions of Northern Illinois. In the wake of this early day activity, a new round of scattered showers and t'storms is expected to develop Thursday afternoon along a cold front moving southward across Central Illinois. After development, this activity will push southward across portions of Central and Southern Illinois, Thursday afternoon into 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 3,500-5,500J/KG, dew points in the low to upper 70's, modest shear, modest forcing, and modest lapse rates of 5.5-6.5C. This environment will be supportive of upwards of an isolated severe t'storm risk (level 1) 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

(10:00PM - 7/27/21) A period of hot and humid conditions continues across the region and will continue to impact the state through the middle of this week. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.

Summary....
A large ridge in place across the US will help extend hot and humid conditions into the state and region for several day period of time, from today through the middle of this week.

Forecast For Next Two Days...
​Wednesday, June 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 be in the mid 90's to mid 100's.

Thursday, June 29th 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 mid 70's across Central and Southern Illinois. Heat index values will be in the mid 90's to mid 100's across Central and Southern Illinois.

​Recap Summary...
Friday, July 23rd Recap...
High temperatures topped out in the mid 80's to low 90's across the state, and low temps in the mid 60's to low 70's. Peak heat index values were in the upper 80's to upper 90's.

Saturday, July 24th Recap...
High temperatures topped out in the upper 80's to mid 90's across the state, and low temps in the low 60's to mid 70's. Peak heat index values were in the mid 90's to mid 100's.

Sunday, July 25th Recap...
High temperatures topped out in the mid 80's to mid 90's across the state, and low temps in the upper 50's to low 70's. Peak heat index values were in the mid 80's to upper 90's.

Monday, July 26th Recap...
High temperatures topped out in the mid 80's to mid 90's across the state, and low temps in the upper 50's to low 70's. Peak heat index values were in the mid 80's to upper 90's.

JP

(11:45AM - 7/27/21) A storm system is expected to move through the region on Wednesday and Thursday, bringing severe t'storm potential to portions of the state Wednesday afternoon through Thursday night.

Summary...
A storm system will move across the Northern Plains tonight, and will push eastward across the Midwest and Great Lakes on Wednesday and Thursday. This storm system will bring severe t'storm potential to portions of the state, Wednesday afternoon through Thursday.

​Forecast...
Wednesday Afternoon - Wednesday Night, July 28th...
While a few isolated showers or t'storms will be possible Wednesday morning into Wednesday afternoon, the main focus will be Wednesday evening through early Thursday morning. Development of scattered showers and t'storms is expected Wednesday afternoon across portions of Minnesota and Wisconsin, in the vicinity of a storm system advancing southeastward. This activity is likely to grow upscale into one or more clusters, which will then push southward across Wisconsin, Western Michigan, Northern Indiana and Northeast Illinois from Saturday evening through early Thursday morning. An environment will be in place supportive of a severe t'storm risk with this activity. This environment will feature high instability of 3,500-5,500J/KG, dew points in the low to upper 70's, high shear, ample forcing, and high lapse rates of 7.0-8.5C. This environment will be supportive of upwards of an isolated to widely scattered severe t'storm risk (levels 1-2) across portions of Northern Illinois. Damaging winds and hail will be the severe weather threats, though an isolated tornado can't be ruled out.
​
Thursday Morning - Thursday Night, July 29th...
​Severe t'storm potential will once again exist across portions of the state for Thursday. More information regarding this potential will be provided in future updates.

​Below are the severe t'storm forecasts for this event.

JP

(9:00PM - 7/26/21) A period of hot and humid conditions continues across the region and will continue to impact the state through the middle of this week. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.

Summary....
A large ridge in place across the US will help extend hot and humid conditions into the state and region for several day period of time, from today through the middle of this week.

​Forecast For Next Two Days...
Tuesday, June 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 low 70's. Heat index values will be in the upper 80's to upper 90's.

​Wednesday, June 28th Forecast...
High temperatures will range from the low to upper 90's across the state, with low temperatures ranging from the upper 60's to mid 70's. Heat index values will be in the mid 90's to mid 100's.

​Recap Summary...
Friday, July 23rd Recap...
High temperatures topped out in the mid 80's to low 90's across the state, and low temps in the mid 60's to low 70's. Peak heat index values were in the upper 80's to upper 90's.

Saturday, July 24th Recap...
High temperatures topped out in the upper 80's to mid 90's across the state, and low temps in the low 60's to mid 70's. Peak heat index values were in the mid 90's to mid 100's.

Sunday, July 25th Recap...
High temperatures topped out in the mid 80's to mid 90's across the state, and low temps in the upper 50's to low 70's. Peak heat index values were in the mid 80's to upper 90's.

JP

(10:30PM - 7/25/21) A period of hot and humid conditions continues across the region and will continue to impact the state through the middle of this week. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.

Summary....
A large ridge in place across the US will help extend hot and humid conditions into the state and region for several day period of time, from today through the middle of this week.

​Forecast For Next Two Days...
Monday, June 26th Forecast...
High temperatures will range from the upper 80's to mid 90's across the state, with low temperatures ranging from the low 60's to low 70's. Heat index values will be in the upper 80's to mid 90's.

Tuesday, June 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 be in the upper 80's to upper 90's.

​Recap Summary...
Friday, July 23rd Recap...
High temperatures topped out in the mid 80's to low 90's across the state, and low temps in the mid 60's to low 70's. Peak heat index values were in the upper 80's to upper 90's.

Saturday, July 24th Recap...
High temperatures topped out in the upper 80's to mid 90's across the state, and low temps in the low 60's to mid 70's. Peak heat index values were in the mid 90's to mid 100's

JP

(10:30PM - 7/24/21) A heat wave continues to settle in across the region and will continue to impact the state through the middle of next week. Hot temperatures, high humidity and high heat indices are expected across the state and region during this period.

Summary....
A large ridge in place across the US will help extend hot and humid conditions into the state and region for several day period of time, from today through the middle of next week.

​Forecast For Next Two Days...
Sunday, June 25th 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 be in the upper 80's to low 100's.

Monday, June 26th Forecast...
High temperatures will range from the low to mid 90's across the state, with low temperatures ranging from the mid 60's to mid 70's. Heat index values will be in the low 90's to low 100's.

Recap Summary...
Friday, July 23rd Recap...
High temperatures topped out in the mid 80's to low 90's across the state, and low temps in the mid 60's to low 70's. Peak heat index values were in the upper 80's to upper 90's.