SWOMCD
SPC MCD 120152
NHZ000-VTZ000-NYZ000-120545-
MESOSCALE DISCUSSION 2458
NWS STORM PREDICTION CENTER NORMAN OK
0752 PM CST THU DEC 11 2008
AREAS AFFECTED...CENTRAL NY NEWD TO NRN VT
CONCERNING...HEAVY SNOW
VALID 120152Z - 120545Z
HOURLY SNOWFALL RATES IN EXCESS OF 1 INCH/HR ARE POSSIBLE BEGINNING
IN THE 04-08Z PERIOD OVER PARTS OF W-CENTRAL NY EXTENDING NWD INTO
PARTS OF EXTREME NRN VT.
WATER VAPOR IMAGERY DEPICTS A PRONOUNCED DRY SLOT MOVING NWD FROM
THE CENTRAL APPALACHIANS WITH DEEP LAYER UVV/S INCREASING THROUGH
THE PERIOD AS THE UPPER SYSTEM APPROACHES FROM THE S. A ZONE OF
SNOW HAS BEEN OBSERVED EXTENDING FROM PARTS OF NRN PA TO NRN VT.
00Z/12 PIT RAOB SHOWED A DEEP...MOIST SUB-FREEZING ISOTHERMAL LAYER.
LATEST RUC FORECAST SOUNDINGS SHOW WITHIN THIS ZONE STEEPENING
MID-LEVEL LAPSE RATES IN THE DENDRITIC GROWTH LAYER /-12 TO -17 DEG
C/ IN ASSOCIATION WITH APPROACHING SYSTEM. 750-650 MB
FRONTOGENETICAL FORCING SHIFTING NEWD WILL ALSO LIKELY CONTRIBUTE TO
ENHANCING SNOWFALL RATES...WITH 1 INCH/HR RATES PROBABLE ACROSS THE
REGION IN THE 04-08Z PERIOD.
..SMITH.. 12/12/2008
...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...GYX...BTV...ALY...BGM...BUF...
LAT...LON 43397374 42847451 42967545 43257572 44087464 44787330
44967252 44897190 44637154 43397374
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