SWOMCD
SPC MCD 021038
NJZ000-PAZ000-DEZ000-MDZ000-DCZ000-VAZ000-021345-
MESOSCALE DISCUSSION 0190
NWS STORM PREDICTION CENTER NORMAN OK
0438 AM CST MON MAR 02 2009
AREAS AFFECTED...DISTRICT OF COLUMBIA...ERN MD...NRN DE...SERN
PA...WRN NJ
CONCERNING...HEAVY SNOW
VALID 021038Z - 021345Z
MDT-HVY SNOW WITH HOURLY RATES UP TO 1 INCH WILL TRANSLATE NWD FROM
VA/DC/MD TOWARD THE PHL METRO AREA THROUGH MID-MORNING. SNOW RATES
SHOULD DIMINISH WITH TIME AS FOCUS FOR HEAVIER SNOWS FOCUSES ACROSS
NEW ENGLAND.
PV-ANOMALY ALONG BASE OF THE MID-LVL LOW WAS QUICKLY TRANSLATING NWD
INTO VA AT 1030Z AND WILL MOVE INTO ERN PA BY LATE MORNING. THIS
FEATURE HAS BEEN ASSOCD WITH MDT-HVY SNOWFALL RATES ACROSS CNTRL VA
EARLY THIS MORNING. EARLIER BREAK IN SNOW ACROSS ERN PA/NJ...PSBLY
TIED TO A NEWD TRANSLATION OF A GRAVITY WAVE...WILL QUICKLY FILL
BACK IN BEFORE SUNRISE.
MOST FAVORABLE DENDRITIC GROWTH ZONE WILL BE SLIGHTLY OFFSET TO THE
WEST WITH RESPECT TO THE MOIST CONVEYOR/LIFT. NONETHELESS... MODEST
VERTICAL MOTION/MID-LVL FRONTOGENESIS ALONG THE TRACK OF THE VORT
MAX WILL BE FAVORABLE FOR NARROW BANDED STRUCTURES WITH SNOWFALL
RATES UP TO 1 INCH PER HOUR.
SNOWS SHOULD QUICKLY TAPER FROM S-N ACROSS THE REGION IN THE 15-18Z
TIME FRAME.
..RACY.. 03/02/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PHI...AKQ...CTP...LWX...
LAT...LON 38867707 40637582 40637484 40157451 38897560 38307655
38867707
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