SPC MD 1714



MD 1714 CONCERNING WINTER MIXED PRECIPITATION FOR SOUTHERN AND EASTERN MAINE

MD 1714 Image

Mesoscale Discussion 1714
NWS Storm Prediction Center Norman OK
0103 AM CST Mon Dec 17 2018

Areas affected...southern and eastern Maine

Concerning...Winter mixed precipitation 

Valid 170703Z - 171300Z

SUMMARY...Snow, perhaps mixed with freezing rain or sleet, will
remain possible through the overnight hours.

DISCUSSION...Frontogenesis in the 850-700-millibar layer within the
warm-conveyor belt has resulted in a band of heavy precipitation
along the southeast coast of Maine. This band will continue to pivot
northwest through the overnight hours. In the vicinity of this band,
surface temperatures have fallen below 32F, despite RAP forecasts
suggesting temperatures would remain near or above 32F. Modifying
the RAP soundings for the observed colder surface temperatures, wet
snow is likely, but given the strength of the warm-air advection
within the warm-conveyor belt, temperatures within the
850-700-millibar layer may approach, or even exceed, 0C. As such,
precipitation may mix with, or change to, freezing rain or sleet
overnight.

..Marsh/Goss.. 12/17/2018

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...CAR...GYX...

LAT...LON   44197086 45246936 45826711 44936676 44246739 43256962
            43007082 44197086 

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