Smokey skies dimmed Monday’s sunshine in Chicago. The smoke had origins in a number of wildfires burning across Canada.
Lower atmospheric northeast winds delivered a yellow veil of smoke off a mammoth fire which forced evacuations in sections of Labrador in northeast Canada over the weekend at the same time mid and high level winds moving out of northern Canada’s Northwest and Nunavut territories picked up additional smoke from blazes in progress there.
Clouds shroud the skies here Tuesday which will obscure the view of any smoke aloft here a second day.
Uncommon early July cool spell driven by 4th consecutive day of northeast winds; only 5 comparably cool streaks of 70s on the books the past 85 years at Midway this time of year
For a 4th consecutive day Tuesday, northeast winds are to blow into the Chicago area after a long trek the length of the Lake Michigan over cool waters. Such a flow maximizes the cooling which takes place carious then metro area—and nowhere more than on area beaches and along the lakeshore.
Back-to-back highs in the 70s over a four-day period this time of year are NOT common. In fact they’re downright rare.
Based on history, a set of four 70s in late June and early July, has occurred only 5 times at Midway Airport since observations began there in 1928. The most recent occurrence was in 2007. You have to go back to 1976 to find another spell of four or more back-to-back 70s at this time of year.
Clouds and showers to replace Monday’s sun
A cloudy, cut-off low aloft has been drifting northwestward since early Monday toward the Chicago area with showers in tow. Its arrival raises rain prospects here Tuesday into Wednesday, though it’s clear the rainy spells won’t be continuous.
Tuesday temperatures more typical of mid-May than early July; 13-degrees below normal!
Peak temperatures Tuesday head for the low 70s in all but lakeside areas—a temperature level more typical of the normal highs May 9. The anomalous Monday chill is 13-degrees below normal.
History suggests big temp rebounds—including 90s– not at all uncommon after cool July opens
The 90-degree temp tallies which have followed the handful of summer cool spells nearly comparable in intensity to the current set-up have been impressive.
In the past, a majority of Julys which have followed a cool spell like this one have actually gone on to produce an ABOVE average of 8-days of 90s in July.