SWOMCD
SPC MCD 161329
MEZ000-MAZ000-NHZ000-VTZ000-NYZ000-161830-
MESOSCALE DISCUSSION 2238
NWS STORM PREDICTION CENTER NORMAN OK
0729 AM CST SUN DEC 16 2007
AREAS AFFECTED...NORTHEAST NY/VT/NH/MA/WESTERN MAINE
CONCERNING...WINTER MIXED PRECIPITATION
VALID 161329Z - 161830Z
MODERATE TO HEAVY SNOW WILL SPREAD ACROSS MUCH OF NORTHERN VT/NH
INTO WESTERN MAINE THIS MORNING...WITH SNOW GRADUALLY TAPERING ALONG
WITH A PRECIP-TYPE TRANSITION TO MAINLY SLEET ACROSS EASTERN NY INTO
MA AND ADJACENT PORTIONS OF SOUTHERN VT/NH.
WATER VAPOR IMAGERY AND UPPER AIR/SURFACE DIAGNOSTICS FEATURE A
CONTINUALLY DEEPENING CYCLONE ACROSS THE OHIO VALLEY...WITH A
SECONDARY SURFACE LOW ALSO CONTINUING TO DEEPEN ALONG THE MID
ATLANTIC COAST WITHIN AN EXISTING LOW LEVEL BAROCLINIC ZONE. SIMILAR
TO EARLY MORNING TRENDS ACROSS NORTHERN/EASTERN NY AND MA...MODERATE
TO HEAVY SNOW IS EXPECTED TO SPREAD NORTHEASTWARD ACROSS NORTHERN
PORTIONS OF VT/NH INTO WESTERN MAINE THROUGH 15Z-18Z. AS 09Z RUC
SOUNDINGS AND THE 12Z GRAY MAINE OBSERVED RAOB IMPLY...AMPLE OMEGA
THROUGH A SATURATED DENDRITIC LAYER WILL CONTINUE TO SUPPORT A
NORTHEASTWARD SPREAD OF MODERATE TO HEAVY SNOW THIS MORNING...WITH
THE POSSIBILITY OF 1 IN/HR SNOW RATES.
FARTHER SOUTHWEST ACROSS PORTIONS OF EASTERN NY AND MA INTO SOUTHERN
PORTIONS OF VT/NH...WITH MID LEVEL WARMING/APPROACHING DRY
SLOT...SNOW IS EXPECTED TO GRADUALLY TAPER WITH A TRANSITION TO
SLEET /AND PERHAPS SOME FREEZING RAIN OR DRIZZLE/ THIS MORNING. THE
12Z ALBANY OBSERVED RAOB FEATURES CONSIDERABLE MID LEVEL WARMING
SINCE LAST EVENING /00Z/...WITH A JUST-ABOVE FREEZING LAYER ALREADY
NOTED AT 12Z AROUND 800 MB...INCREASINGLY FAVORABLE FOR PARTIAL
MELTING/SLEET WITHIN THIS CORRIDOR.
.GUYER.. 12/16/2007
..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...BOX...BTV...ALY...BUF...
45046838 44426839 43597048 42857096 42207166 42157305
43197379 44517583 44977414 44977150 45517029 45536948
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