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  • Tim McGill

Record Breaking Heat Today

The record high for this date is 97° set back in 1973. My forecast is for a high 98° at O'Hare. Yesterday's debris cloud cover from storms that fired overnight Monday and a breeze off the lake kept temperatures down. More sunshine today and a stronger southwest wind preventing a lake breeze will insure a hotter day. Yesterday's 91° at O'Hare marked the 28th 90-degree day this year. That doubles the average amount of 90-degree days we see in a typical year.

Expect middle or upper 90s for highs today right up through the lakeshore.

The humidity will be moderate today and tomorrow with dew points in the 60s. The heat index and air temperatures will be similar but middle to upper 90s is dangerously hot on its own. Thursday's record high is also 97° and it too was set in 1973. We will come close to that tomorrow.

The heat will break by the weekend. Highs for both Saturday and Sunday should stay mainly in the 70s.

While record breaking heat is the headline the lack of rainfall is also a big weather story lately. We are down 3.25 inches of rain compared to average for this month and down 4.40" since July 1st. Scattered showers and thunderstorms will return late Thursday and more expected Friday into Friday night. There is the potential for some severe storms late Friday into Friday night.

Models continue to advertise a flip to a cooler pattern for the start of September. Both the 6-10 day and 8-14 day temperature probability forecasts have us outlooked for cooler than average temperatures overall from August 31st to September 9th.

Long range forecasts also suggest a flip to a wetter pattern. Both the 6-10 day and 8-14 day precipitation probability forecasts have us outlooked for above average rainfall overall from August 31st to September 9th.

Here is my 7 day forecast:

Today: Sunny, breezy & very hot High: 98 (Record is 97 set in 1973)

Thursday: Partly/mostly sunny, sct. t-storms late? Low: 78 High: 96

Friday: Partly cloudy, sct. showers & thunderstorms (some strong) Low: 74 High: 90

Saturday: Mostly sunny Low: 68 High: 78

Sunday: Mostly sunny Low: 60 High: 79

Monday: Partly to mostly sunny Low: 60 High: 80

Tuesday: Partly cloudy, sct. showers & thunderstorms Low: 60 High: 78



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