SWOMCD
SPC MCD 021138
MEZ000-MAZ000-NHZ000-021545-
MESOSCALE DISCUSSION 0191
NWS STORM PREDICTION CENTER NORMAN OK
0538 AM CST MON MAR 02 2009
AREAS AFFECTED...NERN MA...SERN NH AND ERN MAINE
CONCERNING...HEAVY SNOW
VALID 021138Z - 021545Z
HOURLY SNOWFALL RATES OF 1 TO 1.5 INCHES CAN BE EXPECTED THROUGH AT
LEAST 15Z. AXIS OF HEAVIEST SNOWFALL WILL OCCUR WITHIN A 60 NM WIDE
CORRIDOR CENTERED FROM 10NM E KORH-KPWM-30NM S KHUL. THIS INCLUDES
THE BOSTON...MANCHESTER...PORTLAND METRO AREAS.
MID-LVL FRONTOGENESIS AXIS HAS BECOME ESTABLISHED ACROSS CSTL NEW
ENGLAND AT DAYBREAK...DOWNSTREAM FROM THE EJECTING PV-ANOMALY MOVING
NWD INTO VA. WARM/MOIST CONVEYOR HAS BEEN FEEDING INTO THIS
FRONTOGENETIC ZONE FOR SVRL HOURS...WITH MANY REPORTS OF MDT-HVY
SNOW. THE CONVEYOR WILL BEGIN TO SHIFT ENEWD WITH TIME THIS
MORNING. BUT...AS THE VA VORT MAX SHIFTS INTO ERN NY... ENHANCEMENT
OF DEEP LAYER VERTICAL MOTION/FRONTOGENESIS IS EXPECTED TO OCCUR BY
MID-LATE MORNING. A PIVOT POINT WHERE THE LONGEST DURATION OF HEAVY
SNOW IS LIKELY TO EVOLVE OVER SERN NH NEWD INTO PARTS OF ERN MAINE
THROUGH MID-MORNING. THIS AREA WILL ALSO BE CLOSEST TO THE FAVORABLE
DENDRITIC GROWTH ZONE THAT HAS CONTINUED TO BE SLIGHTLY OFFSET TO
THE WEST OF THE MOIST PLUME. THE RESULT WILL BE A PROLONGED PERIOD
OF SNOWFALL RATES EASILY EXCEEDING 1 INCH PER HOUR.
..RACY.. 03/02/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CAR...GYX...BOX...
LAT...LON 43087182 44417076 45356924 45846809 45396759 44806846
43786972 42997064 42167118 42257188 43087182
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