MESO: Mesoscale Discussion 0143

ACUS11 KWNS 231158
SWOMCD
SPC MCD 231158
MEZ000-231600-

MESOSCALE DISCUSSION 0143
NWS STORM PREDICTION CENTER NORMAN OK
0558 AM CST MON FEB 23 2009

AREAS AFFECTED...PORTIONS MAINE.

CONCERNING...HEAVY SNOW

VALID 231158Z - 231600Z

SNOWFALL RATES 1-3 INCHES/HOUR WILL REMAIN POSSIBLE FOR ANOTHER FEW
HOURS -- DECREASING FROM S-N WITH TIME...BUT STILL ACCOMPANIED BY
OCCASIONAL/LOCALIZED BLIZZARD CONDITIONS. OVERALL ORGANIZATION OF
SNOW EVENT OVER MAINE HAS PEAKED AND SHOULD CONTINUE TO DIMINISH
THROUGH REMAINDER MORNING.

11Z SFC ANALYSIS SHOWS APPROXIMATELY 983 MB LOW TRIANGULATED BETWEEN
SERN TIP OF MAINE...AND CANADIAN STATIONS CXGM AND CWVU.
PRIND LOW LEVEL CYCLONE WILL EJECT ENEWD ACROSS ERN NEW BRUNSWICK
COAST AND GRADUALLY FARTHER FROM MAINE. ATTENDANT/ELEVATED WAA
CONVEYOR -- WITH HEAVIEST SNOWFALL CORRESPONDING WELL TO
POSITION/ALIGNMENT OF 850 MB FRONTOGENESIS MAX -- WILL PIVOT
CYCLONICALLY IN ALIGNMENT...BECOMING PROGRESSIVELY MORE ELEVATED AND
WEAKER WITH TIME IN ANY GIVEN LOCALE. ASSOCIATED FRONTOGENESIS MAX
ALSO IS PROGGED TO WEAKEN AND REDEVELOP FARTHER E OVER CENTRAL/ERN
NEW BRUNSWICK...THEN LIFT NEWD RAPIDLY FROM THERE OVER GULF OF ST
LAWRENCE...THROUGH 15Z. THESE TENDENCIES WILL RESULT IN NET NWD TO
NEWD RETREAT OF HEAVIEST SNOW BELT ACROSS REMAINDER NRN MAINE AND
OVER ADJOINING SECTIONS OF CANADA...FOLLOWED BY REDUCTION IN SNOW
RATES IN DISCUSSION AREA THROUGH 18Z. STRONG LOW LEVEL
PRESSURE/HEIGHT GRADIENTS ON W SIDE OF EJECTING CYCLONE ALSO WILL
SUPPORT ADDITIONAL POTENTIAL FOR BLIZZARD CONDITIONS THROUGH
REMAINDER MORNING ACROSS REGION.

..EDWARDS.. 02/23/2009

...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...

LAT...LON 45796778 45546858 45446961 45936979 46556950 47086928
47446911 47406904 47256902 47176886 47266846 47376826
47046780 45796778

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