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| Mesoscale Discussion 128 |
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MESOSCALE DISCUSSION 0128
NWS STORM PREDICTION CENTER NORMAN OK
0754 AM CST SAT FEB 09 2013
AREAS AFFECTED...CENTRAL/EASTERN MA AND NH/MAINE
CONCERNING...BLIZZARD
VALID 091354Z - 091800Z
SUMMARY...HEAVY SNOWFALL AND BLIZZARD CONDITIONS WILL PERSIST
THROUGH LATE MORNING/EARLY AFTERNOON ACROSS PORTIONS OF
CENTRAL/EASTERN MA INTO NH/MAINE. SNOWFALL RATES ARE EXPECTED TO
GRADUALLY DIMINISH...ALTHOUGH 2-3 IN/HR RATES WILL REMAIN POSSIBLE
ESPECIALLY ACROSS COASTAL/EASTERN MAINE INTO EARLY AFTERNOON. THE
PERSISTENCE OF VERY STRONG NORTHERLY WINDS WILL CONTINUE TO
CONTRIBUTE TO CONSIDERABLE BLOWING/DRIFTING SNOW.
DISCUSSION...CYCLONE CONTINUES TO GENERALLY SHIFT EAST-NORTHEASTWARD
THIS MORNING...CENTERED OFF THE COAST OF MA AS OF 13Z. A MULTI-HOUR
TREND OF WARMING CLOUD TOPS CONTINUES TO BE NOTED IN IR SATELLITE
IMAGERY ACROSS MUCH OF NEW ENGLAND ASIDE FROM MAINE. THIS COINCIDES
WITH THE EASTWARD SHIFT OF FORCED ASCENT AWAY FROM THE
REGION...WHICH SHOULD LEAD TO DIMINISHING SNOWFALL RATES THROUGH THE
MORNING. THAT SAID...A LONGER-LIVED/PIVOTING BAND ACROSS
COASTAL/EASTERN MAIN WILL CONTINUE TO PRODUCE HEAVY SNOWFALL WITH
2-3 IN/HR RATES POSSIBLE INTO EARLY AFTERNOON. THE 12Z OBSERVED
SOUNDING FROM GRAY MAINE FEATURED A DEEPLY SATURATED/COLD
THERMODYNAMIC PROFILE EFFICIENT FOR HEAVY SNOWFALL. EVEN WHILE
SNOWFALL RATES MAY BEGIN TO DIMINISH BY LATE MORNING/EARLY
AFTERNOON...VERY STRONG NORTH-NORTHEASTERLY WINDS WILL CONTRIBUTE TO
CONSIDERABLE BLOWING AND DRIFTING SNOW AS WSR-88D VWP DATA FROM GRAY
MAINE CONTINUES TO SAMPLE 60-65 KT WINDS WITHIN THE LOWEST 1-2 KM
AGL.
..GUYER.. 02/09/2013
ATTN...WFO...CAR...GYX...BOX...
LAT...LON 46396789 44846725 44356825 42977040 41947030 41437068
42277181 43727117 45526892 46396789
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