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000
ACUS11 KWNS 271524
SWOMCD
SPC MCD 271524
MEZ000-MAZ000-NHZ000-RIZ000-272030-

MESOSCALE DISCUSSION 0046
NWS STORM PREDICTION CENTER NORMAN OK
0924 AM CST TUE JAN 27 2015

AREAS AFFECTED...RI...ERN MA...ERN NH...AND MUCH OF MAINE

CONCERNING...HEAVY SNOW

VALID 271524Z - 272030Z

SUMMARY...HEAVY SNOWFALL WITH RATES IN EXCESS OF 1 INCH/HR WILL
CONTINUE THROUGH AT LEAST 20Z ACROSS RI...ERN MA...ERN NH...AND MUCH
OF MAINE. THE AXIS OF HEAVIEST SNOWFALL WILL SHIFT NWD WITH TIME.

DISCUSSION...SFC MESOANALYSIS AT 15Z INDICATES A LOW SE OF MA WITH A
MINIMUM CENTRAL PRESSURE OF 978 MB...MOVING NEWD WITH TIME. A CLOSED
UPPER LOW WITH AN ASSOCIATED VORTICITY MAXIMUM IS LOCATED JUST
OFFSHORE THE RI/MA COAST...ALSO MOVING NEWD. MID-LEVEL FRONTOGENESIS
AND DEEP ASCENT ASSOCIATED WITH THE UPPER LOW ARE THE PRIMARY
FEATURES RESPONSIBLE FOR THE ONGOING N/S ORIENTED BAND OF HEAVY SNOW
ACROSS THE DISCUSSION AREA.

LATEST SFC OBSERVATIONS SHOW BLIZZARD CONDITIONS CONTINUING ALONG
THE COAST FROM MAINE TO MA WITH A STRONG PRESSURE GRADIENT BETWEEN
THE SFC LOW OFF THE MA COAST AND HIGH PRESSURE ACROSS THE ERN
CANADIAN PROVINCES. AS BOTH THE SFC AND UPPER LOW MOVE NEWD THROUGH
20Z...THE AXIS OF HEAVIEST SNOWFALL WILL CONTINUE TO SHIFT NWD AWAY
FROM RI AND ERN MA...AND TOWARDS ERN NH AND MUCH OF CNTRL/ERN MAINE.
SNOWFALL RATES SHOULD BEGIN TO DECREASE AFTER 20Z AS THE SFC LOW
FILLS UNDERNEATH THE UPPER LOW CIRCULATION...AND MID-LEVEL
FRONTOGENESIS SHIFTS NWD AND AWAY FROM THE DISCUSSION AREA.

..GLEASON/PETERS.. 01/27/2015

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

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

LAT...LON   41397175 42567179 44637103 46056883 46566782 45646757
            45146706 44676710 44426739 44116834 43776965 42947057
            41357043 41397175