All Weather News

Wild Temperature Swings

8 Sep 2013, 12:11 pm

Temperatures across the upper midwest and central plains were very warm yesterday, with some places breaking records.  That heat has backed down in some spots with the jet stream being knocked back a little bit to the south, and an area of Canadian High pressure is coming down from the north, bringing some cool air and light winds.

But the break from the heat is temporary, as the jet stream will lift back up a little northward.  An area of low pressure in the central plains will move towards the Great Lakes, lifting up alot of warmth and humid conditions, causing temperatures to soar in some spots well beyond their seasonal average for this time of year.

Here is the 7-day temperature trend for Des Moines, IA.  We start off by looking back at yesterday where the high was into the mid 90s, nearly 20° above normal.  Today the highs will be looking to be still above normal, but only 11°.  After Monday comes around, temps will have gone back into the upper 90s once again.  The record high for Des Moines on Monday is 99° and that record could be in jeopardy of being tied, if not broken.

In the Twin Cities Metro area of Minnesota, the temperatures got within a few degrees shy of the record (98°)  yesterday.  Today, with mostly cloudy skies, temps will struggle to get to the forecasted 81°.  But tomorrow, with a warm front lifting up through the area and mainly sunny skies, the temps will skyrocket to 98°!  The record for Monday is 95° and that record looks to be smashed.  Temps will cool down rapidly after the cold front from that area of low pressure comes through.  Highs will get into the low 80s for the mid week, and then barely into the 70s by the end of the week.  It will feel like we go from the middle of Summer to the beginning of Autumn in just a matter of days.

Here is how it looks for daytime highs for Sunday where the highs in the Great Lakes are comfortable, in the 70s and there is warmer air to the west in Iowa and the Plains.

Forcasted highs for Monday in the upper Midwest will make folks go and turn their A/Cs back on after a day of likely giving them a break in places like the Twin Cities.

We then turn our attention to the northeast, which is also seeing big swings in their temperatures.

In New York City, temperatures were a little milder yesterday than the seasonal average, but not by much.  After a high of 80°, today highs were forecasted to be in the upper 70s but as of around noon time, temps have gone to the low 80s.  Tomorrow, temps are forecasted to be in the low 70s before a big surge of heat comes this way and knocks highs into the mid 80s.  And much like a rollercoaster, temps will drop back then (thank goodness not with an insane drop), to the mid 70s, which is seasonal for this time of year.

Temps across the region in the northeast are forecasted to be on the cool side after a cold front has already passed through the interior section of the region.  Temps up in Buffalo and Burlington are forecasted to be into the mid 60s and in Boston, temps were forecasted this morning to be in the low 70s, but they have seen a recent bump of warmth to jump into the mid 70s.

But later on tonight, after the cold front has come and gone, the Canadian High pressure system behind it will settle in nicely.  The winds of the day today will subside and the clouds fade away, so radiational cooling will allow the heat of the day to escape up into space.

A chilly night is coming into some areas, with low temps expected to get into the 30s.  A frost advisory is up for the Adirondack Mountains in upstate NY, as well as portions of the Green and White Mountains in upper New England, as well as into Maine.  The heaters may have to be turned on in the cars in Glens Falls, NY and Barre, VT in the morning hours as you go to work or drop the kids off at school.

Here is the national map for the day ahead tomorrow.  Have a wonderful rest of your Sunday and a great upcoming work week!

Meteorologist Addison Green ~ Twitter: @agreenWNTV

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