Classic CAD, December 16, 2012

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By Ralph Fato on December 16, 2012, 9:00pm Last modified: December 17, 2012, 5:32pm

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High pressure near Maine, 850mb temps warming above freezing while the surface has dropped and stayed below freezing in spots. Since cold air is dense, it doesn't rise and so it gets stuck at the surface while its warm up above. Topography can also play a role in creating a temperature inversion since it can sometimes cause cold air to flow from mountain peaks down into valleys. This cold air then pushes under the warmer air rising from the valley, creating the inversion.  

Take a look at the 8:30pm setup 12/16/12. Light blue background is where the 5000 foot level is above freezing. Numbers on the map are the surface temps. So basically where the surface is below freezing under the light blue areas is mostly freezing rain falling. Northern CT and Litchfield County was below freezing at this time.

Freezing Rain Advisories into Northern CT because of it. BDL was reporting ZR. Winter Advisories elsewhere and Winter Storm Warnings for parts of NH and ME.

I should point out, thickness of atmosphere temps needs to be considered as well.

CPC just now issued an area of watch for northern NY, VT, MA and southern NH..

SUMMARY...THE COVERAGE AND INTENSITY OF WINTER MIXED PRECIPITATION
ARE EXPECTED TO INCREASE AFTER 04Z. FREEZING RAIN WITH RATES OF 0.05
INCH PER 3 HOURS WILL BE POSSIBLE. ALSO...SNOW RATES APPROACHING 1
IN/HR MAY OCCUR FROM CNTRL/ERN VT INTO W-CNTRL NH AFTER 10Z.

MtWashington 

Take a look at Mt Washington Auto road.. clearly see at 2300' its 19 degrees and just 1000 feet high it warms to 26 degrees! http://www.mountwashington.org/weather/

 

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Ralph Fato

Town: Coastal, CT  

Reporting for WXedge since May 2012.

Articles: 158

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