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  • Tim McGill

The Calm After The Storms

I blogged on Monday about strong storms possibly helping to break the heat. Saying they were strong storms was a bit of an understatement. The last time a derecho came through that was that devastating was in the middle of July, 2011. That event left almost a million people without power. A derecho is a "is a widespread, long-lived wind storm associated with a band of rapidly moving showers or thunderstorms variously known as a squall line, bow echo, or quasi-linear convective system."


The storms were able to harness an incredible amount of energy. The combination of high heat and humidity made it feel like 105° in a few places. At one point there were nearly 3000 lightning flashes per hour in the Chicagoland area.


In the wake of that squall line we have cooler and more comfortable weather to enjoy for a few days. Monday's high hit 91° at O'Hare marking the 23rd 90° day this year. It's the sixth greatest number of 90° days we have ever seen in a year. Today's highs are back to about average in the lower 80s.


Not only a break from the heat expected but a break from the storms too. The only decent chance for a few scattered thunderstorms will be late Saturday into early Sunday.


Seeing a signal that suggests a return to either near normal or below normal temperatures for the middle to late part of August. The 6-10 and 8-14 day temperature probability forecast has us near normal from August 16th through the 24th. Most of next week will see highs only in the 70s. A growing area of blue just south of the city on these forecasts suggests maybe a switch to a cooler pattern in a week or so. Stay tuned.


Here is my 7 day forecast:


Today: Mostly sunny High: 83 (78 Lakefront)


Wednesday: Mostly sunny Low: 63 High: 85 (80 Lakefront)


Thursday: Partly to mostly sunny Low: 68 High: 85 (79 Lakefront)


Friday: Partly/mostly sunny, isolated thunderstorm possible Low: 69 High: 87 (83 Lakefront)


Saturday: Partly cloudy, sct. showers/t-storms possible Low: 70 High: 88


Sunday: Partly cloudy, sct. showers/t-storms possible Low: 69 High: 85


Monday: Partly to mostly sunny Low: 66 High: 78


#ilwx

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