All Weather News

Fall Begins with Midwest Snow and a Northeast Severe Threat

22 Sep 2012, 12:26 pm

Happy Fall!

Fall officially began this morning with the Autumn Equinox at 10:49 am.  For the northern half of the nation, there is no doubt that the seasons are changing.  In fact, some may even say that we are moving too quickly right into winter.  Late yesterday, snow fell across Northern Minnesota!

September Snow

The scene in Hibbing, Minnesota.   With the ground temperature still so warm, it didn’t last through the night.

Snow briefly accumulated to about a half inch.

Snow fall in Hibbing, MN coating a parked car.

Midwest Cold Blast

Even though the snow is ending, the winter feeling is still lingering around the Midwest through the rest of the weekend.  A cold blast of air is coming in behind the wet weather.  As winds subside tonight and the skies clear out, the temperatures will be plummeting with many areas dealing with temperatures  in the 20s and 30s.

Aqua shaded areas indicate Freeze Warnings.  Dark blue counties to the east are under a Freeze Watch and the light blue counties to the west are Frost Advisories.

From the National Weather Service:

...FREEZE WARNING FOR TONIGHT INTO SUNDAY MORNING FOR ALL OF
CENTRAL AND SOUTHERN MINNESOTA AND WEST CENTRAL WISCONSIN...

.A FREEZE WARNING HAS BEEN ISSUED FOR THE AREA 1 AM TO 8 AM
SUNDAY MORNING FOR ALL OF CENTRAL AND SOUTHERN MINNESOTA AND WEST
CENTRAL WISCONSIN.

LOWS SUNDAY MORNING WILL DROP INTO THE MIDDLE 20S TO AROUND
30 OUTSIDE OF THE URBAN CORE OF THE TWIN CITIES. THIS WILL LIKELY
RESULT IN A HARD FREEZE FOR MANY LOCATIONS. WITHIN THE URBAN CORE
OF THE TWIN CITIES METRO AREA...TEMPERATURES ARE CURRENTLY
EXPECTED TO REMAIN IN THE LOWER TO MIDDLE 30S. REMEMBER...FROST
MAY BE POSSIBLE EVEN IF TEMPERATURES REMAIN A FEW DEGREES ABOVE
FREEZING.

A COLD DOME OF CANADIAN HIGH PRESSURE WILL BE BUILDING OVER THE
REGION TONIGHT AND SUNDAY. THIS WILL RESULT IN CLEAR SKIES AND
CALM WINDS SATURDAY NIGHT...WHICH WILL ALLOW TEMPERATURES TO FALL
BELOW 32 DEGREES FOR MUCH OF THE AREA BY SUNDAY MORNING.

Gusty Winds

Credit: http://gpsailing.org/?p=1202

Picture from the Rolex Farr 40 Yacht race at the Chicago Yacht Club in Lake Michigan early this week.  Wind gusts in the Wind City this morning were over 30 mph.

Tight packed isobars indicate the high winds behind the area of low pressure north of the Great Lakes. With the counter clockwise rotation around this system, the air will be streaming straight out of Canada and transporting that chilly air down to the Midwest. On the east side of the system through, the flow is still from the south.  That will be driving temperatures back in the the 70s and 80s today and that will be setting the stage for what may be an active afternoon.

Combine that wind with the cool weather and that leaves some areas with Wind Chills in the 30s and 40s.  Wind chill values are only relevant for temperatures below 50 degrees.

 

Severe Threat Today

As this cold air moves eastward, it collides with the warmer air already in place in the Northeast.  Slight risk area shaded in yellow includes Washington DC, New York, Philadelphia, Baltimore, and Burlington, VT.

Yesterday, this same system brought a few areas of wind and hail damage to the Ohio River Valley.  Some of those same threats will be in place today as these storms move into the Northeast.

Happy Fall!

Gretchen Mishek

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