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Mesoscale Discussion 181
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   MESOSCALE DISCUSSION 0181
   NWS STORM PREDICTION CENTER NORMAN OK
   0501 PM CDT WED MAR 12 2014

   AREAS AFFECTED...NRN NH/VT INTO ME

   CONCERNING...HEAVY SNOW 

   VALID 122201Z - 130400Z

   SUMMARY...HEAVY SNOW WILL CONTINUE ACROSS NRN NH/VT AND SRN MAINE
   WHILE SHIFTING E/NE ACROSS NRN MAINE THIS EVENING AND TONIGHT. HEAVY
   SNOWFALL RATES OF 1 INCH PER HOUR ARE EXPECTED...WITH PERIODS OF 2
   INCH PER HOUR RATES NOT UNCOMMON. ADDITIONALLY...BLOWING SNOW WILL
   FURTHER REDUCE VISIBILITIES AS WIND SPEEDS INCREASE THIS EVENING TO
   AROUND 10-20 MPH WITH GUSTS TO 30 MPH.

   DISCUSSION...HEAVY SNOW HAS BEEN OCCURRING THIS AFTERNOON ACROSS NRN
   NY/NH/VT AND SRN MAINE IN A BAND OF STRONG ASCENT AND 850 MB
   FRONTOGENESIS TO THE NORTH OF THE SURFACE LOW CURRENTLY LOCATED OVER
   CENTRAL PA. AS THE LOW CONTINUES TO TRACK E/NE THIS EVENING...HEAVY
   SNOW IS EXPECTED TO CONTINUE IN FAVORABLE DEFORMATION ZONE ACROSS
   NRN NH/VT AND PIVOTING E/NE INTO CENTRAL AND NRN MAINE. FORECAST
   SOUNDINGS INDICATE SOME VERY WEAK MIDLEVEL INSTABILITY /LESS THAN
   100 J PER KG MUCAPE/. THIS SHOULD PRECLUDE MUCH IN THE WAY OF
   THUNDERSNOW BUT COULD AID IN THE DEVELOPMENT OF CONVECTIVELY
   ENHANCED HEAVIER BANDS OF SNOW. WIDESPREAD RATES OF 1 INCH PER HOUR
   ARE EXPECTED...BUT 2 INCHES PER HOUR WILL NOT BE UNCOMMON AT TIMES.
   INCREASING SFC WINDS ON THE BACK SIDE OF THE LOW WILL SPREAD ACROSS
   THE REGION THIS EVENING AND OVERNIGHT..LEADING TO BLOWING AND
   DRIFTING SNOW AND LOWERING VISIBILITIES EVEN FURTHER WITH N/NELY
   WINDS AROUND 10-20 MPH GUSTING TO 30 MPH.

   ..LEITMAN.. 03/12/2014


   ATTN...WFO...CAR...GYX...BTV...

   LAT...LON   46076737 45696749 45326778 44756881 44256988 43727103
               43527283 43827339 44597342 45077298 46897026 47686909
               47736785 47296727 46076737 

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Page last modified: March 20, 2014
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