MESO: Mesoscale Discussion 0250

ACUS11 KWNS 081325
SWOMCD
SPC MCD 081325
MAZ000-NHZ000-RIZ000-CTZ000-NYZ000-081730-

MESOSCALE DISCUSSION 0250
NWS STORM PREDICTION CENTER NORMAN OK
0725 AM CST FRI MAR 08 2013

AREAS AFFECTED...CENTRAL AND ERN MA/FAR SRN NH/RI/CT/LONG ISLAND

CONCERNING...HEAVY SNOW

VALID 081325Z - 081730Z

SUMMARY...HEAVY SNOWFALL RATES AROUND 1 INCH PER HOUR ARE EXPECTED
TO PERSIST THROUGH THE MORNING ACROSS MUCH OF ERN AND CENTRAL MA
INTO NERN CT. CURRENT THINKING SUGGESTS THESE GREATER SNOWFALL RATES
WILL SPREAD SWWD AND SWD ACROSS MORE OF CT AND POSSIBLY AFFECT PARTS
OF LONG ISLAND PRIOR TO THIS WINTER WEATHER HAZARD DIMINISHING
AROUND 17-18Z.

DISCUSSION...AT 13Z...REGIONAL RADAR IMAGERY INDICATED A 30-45 MILE
WIDE BAND OF SNOW /EMBEDDED WITH MODERATE TO HEAVY SNOWFALL RATES/
EXTENDING FROM NERN CT THROUGH CENTRAL AND ERN MA TO FAR SERN NH.
THIS BAND OF PRECIPITATION IS LOCATED WITHIN A ZONE OF STRONG LOW
LEVEL WAA EXTENDING FROM THE NWRN ATLANTIC AND ACROSS SRN NEW
ENGLAND...ATTENDANT TO A 50-55 KT ENELY LLJ AS SAMPLED BY BOSTON MA
WSR-88D VWP DATA AT 1254Z. 06Z NAM/10Z HRRR/00Z WRF-NSSL 4 KM ALL
SUGGEST THE CURRENT BAND OF SNOW WITH EMBEDDED HIGHER SNOWFALL RATES
SHOULD EXPAND SWWD/SWD ACROSS MORE OF CT THIS MORNING AND POSSIBLY
AFFECT PARTS OF LONG ISLAND WITH RATES UP TO 1 INCH PER HOUR. THESE
MODELS ALSO INDICATED THE HEAVIER SNOWFALL RATES WILL BEGIN TO
DIMINISH BY 17-18Z AS THE CURRENT STRONG LLJ WEAKENS AND THEN SHIFTS
SWD OFF THE SRN NEW ENGLAND COAST AFTER 18Z.

..PETERS/COHEN.. 03/08/2013

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...GYX...BOX...OKX...ALY...

LAT...LON 42727092 42017081 41477173 40947221 40807308 40867341
41397342 41987297 42387251 42737194 42957138 42727092

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