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| Mesoscale Discussion 174 |
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MESOSCALE DISCUSSION 0174
NWS STORM PREDICTION CENTER NORMAN OK
1131 PM CST TUE FEB 19 2013
AREAS AFFECTED...NRN MAINE
CONCERNING...HEAVY SNOW
VALID 200531Z - 200930Z
SUMMARY...SNOWFALL RATES UP TO 1 INCH/HR ARE PROBABLE ACROSS NRN
MAINE TONIGHT.
DISCUSSION...NEGATIVELY TILTED SHORTWAVE TROUGH IS PIVOTING NEWD
ACROSS SRN NEW ENGLAND AS OF 0530Z. MEANWHILE...RELATIVELY MOIST SLY
850 MB FLOW ASSOCIATED WITH A WARM CONVEYOR BELT IS SPREADING INTO
MAINE. UPPER DIVERGENCE AND STRONG LARGE-SCALE ASCENT OVERSPREADING
THIS MOIST SLY FLOW HAS RESULTED IN AN EXPANSIVE SHIELD OF
PRECIPITATION MOVING NWD ACROSS COASTAL MAINE. MEANWHILE AT THE
SURFACE...ELY WINDS ARE MAINTAINING A SUB-FREEZING AIRMASS ACROSS
THE NRN HALF OF MAINE. AS THE PRECIPITATION SHIELD SPREADS N ACROSS
THIS AIRMASS...SNOWFALL RATES OF 1 IN/HR WILL BECOME PROBABLE.
SHORT-TERM MODEL GUIDANCE INDICATES HEAVY SNOW WILL OCCUR THROUGH
12Z...AND THEN EXIT INTO CANADA BY MID MORNING.
..GARNER.. 02/20/2013
ATTN...WFO...CAR...GYX...
LAT...LON 47066762 45716744 45326799 45427044 45857058 47486925
47066762
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