MORE RECORD HEAT, THEN A MAJOR COOL DOWN

By: TerrySwailsWeather , 6:43 AM GMT on September 10, 2013

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CAN I HAVE ANOTHER RECORD PLEASE? I'LL TAKE A MAJOR COOL DOWN TOO
A big day for heat around the Midwest with highs 10-20 degrees above normal. It was 101 in Des Moines and Mt. Pleasant, Iowa. 100 at Cedar Rapids, Muscatine, and Burlington. The 101 in Des Moines was the hottest temp ever for so late in the summer season. Here in the Quad Cities our high of 99 tied the record originally set in 1933. WOW!
More records are expected Tuesday with the heat dome still in control and records a few degrees cooler. Here are the marks to beat Tuesday.
RECORD HIGHS FOR SEPTEMBER 10...
MOLINE.........95 IN 1983
CEDAR RAPIDS...98 IN 1931
DUBUQUE........97 IN 1895
BURLINGTON.....97 IN 1933
Of course, the heat was especially hard on those areas where no rain has fallen for 35 to 41 consecutive days. The rain free streak will reach 36 in the Quad Cities Tuesday and that is 3rd longest behind 40 days in 1944 and 45 days in 1952.
We have one more day of heat before temperatures begin to tail off behind a cold front Wednesday. By Friday, highs will be 30 degrees cooler as northwest flow and Canadian high pressure become dominant.

While the change to early fall temperatures will be nice the focus remains on much needed rain chances. Both the GFS and Euro keep rain spotty and to a minimum along the cold front Wednesday. I'm not liking chances as forcing weakens when the front hits the region. Another system arrives late weekend but both models keep the brunt of the rain north of I-80. While some forecasters are pretty bullish with the rain threat I remain very cautious in my approach. Notice the EURO 10 day rainfall forecast, nothing much over the SE third of Iowa and northern Illinois. Hard to say this far out but unless we can get some sort of surface wave to develop NW flow is not my favorite for soaking rains. I'm playing it down until I see something more concrete.

Note the CFSv2 temperature anomalies I posted. An impressive cool down Sept 14-19th but the warm air comes right back in a modified form the 19th-24th and hangs around the rest of the month. That's a wrap folks!

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About TerrySwailsWeather

Terry is a TV meteorologist at WQAD TV in the Quad Cities. He has 38 years on-air experience, is a 3 time published author with a passion for weather!

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