MESO: Mesoscale Discussion 0312

ACUS11 KWNS 011325
SWOMCD
SPC MCD 011325
MEZ000-NHZ000-011830-

MESOSCALE DISCUSSION 0312
NWS STORM PREDICTION CENTER NORMAN OK
0725 AM CST SAT MAR 01 2008

AREAS AFFECTED...NH/MAINE

CONCERNING...HEAVY SNOW

VALID 011325Z - 011830Z

MODERATE/HEAVY SNOW IS EXPECTED TO SPREAD ACROSS MUCH OF NH INTO
CENTRAL/COASTAL MAINE THROUGH EARLY AFTERNOON...WITH LOCALIZED RATES
OF 1-2 IN/HR.

WATER VAPOR IMAGERY FEATURES A NEARLY VERTICALLY STACKED
CYCLONE...WITH A 1008 MB SURFACE LOW AS OF 13Z...SHIFTING EASTWARD
ACROSS FAR EASTERN ONTARIO AT DAYBREAK. AMPLE DOWNSTREAM PRESSURE
FALLS ARE ONGOING ACROSS MUCH OF NEW ENGLAND...WITH MODERATE/LOCALLY
HEAVY SNOW BECOMING MORE COMMON OVER THE PAST 1-2 HOURS ACROSS
PORTIONS OF SOUTHERN VT/SOUTHERN NH INTO FAR WESTERN COASTAL MAINE.
AS THE MID LEVEL WAVE BECOMES PROGRESSIVELY CLOSED THROUGH
MIDDAY...06Z NAM/GFS AND 09Z RUC/SREF GUIDANCE IMPLY AN INCREASING
SNOW INTENSITY THIS MORNING...WITH A DOWNSTREAM SPREAD OF
MODERATE/HEAVY SNOW ACROSS MUCH OF CENTRAL/COASTAL MAINE. WITHIN
THIS CORRIDOR...06Z NAM/09Z RUC FORECAST SOUNDINGS DEPICT A SEVERAL
HOUR PERIOD OF AMPLE DEEP LAYER OMEGA COINCIDENT WITH A FAVORABLE
DENDRITIC GROWTH LAYER. FURTHERMORE...INCREASINGLY STEEP MID LEVEL
LAPSE RATES/MODEST SLANTWISE INSTABILITY WILL CONTRIBUTE TO ENHANCED
SNOW RATES ACROSS CENTRAL/COASTAL MAINE BETWEEN 15Z-21Z...WITH
LOCALIZED RATES LIKELY TO REACH 1.5-2.0 IN/HR.

.GUYER.. 03/01/2008

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

..NOTICE...
SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.

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

43157110 43467184 44287143 45266990 45666807 45266742
44826745 44496873 43687049

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