Autumn Chill Sweeps Great Lakes, West Continues To Simmer, East Coast Storms, Arctic Shot Next Weekend? (Inc Video!)

Photo courtesy of Mark Vogan

Highs yesterday remained stuck in the 70s from Minneapolis to Detroit with Chicago ‘shivering’ at 75°. It was even cooler around the Lakes with highs in Wisconsin and Michigan only topping out in the mid-60s. While many are in the 50s this morning, International Falls on the Canadian border fell to a chilly 37°.

The low pushing east over the eastern Lakes will be responsible for bringing strong backside north winds and producing big waves on Lakes Superior and particularly Michigan with highs again holding in the low to mid-70s in Chicago and Detroit, 60s further north.

Heavy storms and now taking aim at Philadelphia and later, New York City!

The low is also responsible for pumping heat and humidity up the East Coast ahead of a cold. There are currently two lines of storms one back where the cold front is positioned and the second is a front runner which is now exiting eastern Pennsylvania and pushing into western New Jersey, taking aim initially at Philadelphia and later today, New York City. Torrential, flooding rains, gusty winds and lots of lightning can be expected from these storms.

Radar image courtesy of weather.com

Two days in a row of 126° at Death Valley, 110s dominate Vegas, Phoenix & CA Central Valley

While the cool shot currently drills into the Upper Midwest and Lakes, the heat is very much alive in the Western part of the country with yesterday marking the second consecutive 126° reading at Death Valley. The hottest August value for the site and US since 1998. In Phoenix the past two days has seen 115° and 114° respectively and today and the next several days appear to comfortably hold above the 110° mark. The 110-116

The 100s aren’t confined to the Desert Southwest as they’ve been reaching all the way up through the basins and low elevation valleys of the Great Basin and up into the interior Northwest and Montana. Mid-90s have dominated the LA Basin and eastern side of San Diego for the first time this summer and you don’t have to go far inland till you get the 100s.

Forecasted highs for Southwest off NAM-WRF model (Courtesy of WeatherBELL Models)

The deeper trough the ECMWF has for next week has arctic air coming with it, may lead record cold highs and an early frost/freeze from ND to IN

As we head into next week, a significant cold pool spinning over Arctic Canada looks to expand and help deepen a trough over the Yukon. The ECMWF shows this trough plunge south over Western Canada, eventually dropping into Montana by late next week before sliding east through the Northern Plains and Great Lakes next weekend. This may help pump 90s back into the I-5 corridor between Seattle and Portland with near 100° in Portland. What’s eyecatching about this second shot of chill is that arctic air can be drawn down and this could have the potential in providing record cold daytime highs and early frost and freezes in rural areas from eastern Montana to the Ohio Valley next weekend.

The key difference between the current cool shot and the possible one the ECMWF has for later next week is that this one isn’t fed by any real cold air to it’s north. This is obviously far out and lots can change but this is certainly worth keeping a close eye on.

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