Mid-July Heat Wave Update #3

(7:00PM - 7/15/20) A heat wave has begun to affect portions of the state, and will continue to impact the region over the next week or so...Bringing hot temperatures, high humidity and high heat indices to the state and region during this period.

Summary....
A heat wave has begun to impact the state, and will continue to impact the state and region over the next week or so. During this time, the ridge in place will fluctuate north and south. This will lead to consistently hot temperatures across the southern half of the state, and altering hot to more tolerable summer conditions across the northern half of the state, where an active storm pattern will also be in place. With the initial ridge building in through Thursday, high temperatures into the 90's will be likely across the southern half of the state on a daily basis, with low temperatures in the mid 60's to mid 70's on a nightly basis. Humidity  and heat indices will be increasing, with heat index values in the low 90's to low 100's on a daily basis. The ridge is expected to strengthen and build northward around the weekend, from Friday through Monday. During this time much of the state will see high temperatures well into the 90's on a daily basis, with high temperatures into the low 100's possible across Southwest Illinois. Low temperatures in the mid 60's to upper 70's will be likely on a nightly basis. High humidity and heat indices will be in place during this time, with heat index values in the mid 90's to mid 100's on a daily basis. There is potential for the heat wave to continue across portions of the region and state beyond Monday...However this is a bit too far out to put too much confidence in at this time.

Forecast For Next Two Days...
Thursday, July 16th Forecast...
Cooler temperatures will filter in on the backside of Wednesdays disturbance, leading to a brief reprieve to the start of the heat wave for many areas. High temperatures will range from the upper 80's to mid 90's across Southern Illinois, with low to mid 80's across Northern and Central Illinois. Heat index values in the upper 80's to upper 90's across Southern Illinois, with low to upper 80's across Northern and Central Illinois. Low temperatures in the low 60's to mid 70's across the state.

Friday, July 17th Forecast...
The ridge will begin to flex into the region more on Friday, leading to more widespread hotter and humid conditions across the state. High temperatures ranging from the upper 80's to mid 90's across the state. Heat index values in the upper 80's to mid 90's across Northern Illinois, and the low 90's to low 100's across Central and Southern Illinois. Low temperatures in the mid 60's to mid 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.
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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.

JP

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