Heavy Snow VT & NH
Posted by JAC on 2/24/2010, 12:58 pm


MESOSCALE DISCUSSION 0145
  NWS STORM PREDICTION CENTER NORMAN OK
  1044 AM CST WED FEB 24 2010
 
  AREAS AFFECTED...NERN NY...NRN VT/NH...AND FAR WRN ME
 
  CONCERNING...HEAVY SNOW
 
  VALID 241644Z - 242015Z
 
  SNOWFALL RATES NEAR 1 IN/HR WILL BE POSSIBLE ACROSS NERN NY...NRN
  VT/NH...AND FAR WRN ME DURING THE AFTERNOON...WITH THE THREAT
  FORECAST TO DECREASE SUBSTANTIALLY BY OR SHORTLY AFTER 00Z.
 
  WV IMAGERY DEPICTS A FAST MOVING UPPER IMPULSE LIFTING N-NEWD
  THROUGH ERN PA/SRN NY AT 16Z...WITH A ZONE OF COLD CLOUD TOPS
  LOCATED DOWNSTREAM OVER NERN NY INTO VT/NH. LARGE SCALE ASCENT AHEAD
  OF THE UPPER WAVE IS EXPECTED TO AID IN MAINTAINING A DEEPLY
  SATURATED AIRMASS...BEFORE EXITING N OUT OF THE REGION BY 00Z. IN
  ADDITION...SELY LLJ IS FORECAST TO INTENSIFY TO 50+ KT DURING THE
  AFTERNOON...WHICH MAY ENHANCE ASCENT AND SUBSEQUENT PRECIPITATION
  RATES ALONG WINDWARD FACING MOUNTAIN SLOPES. MEANWHILE...SURFACE
  WINDS WILL GENERALLY MAINTAIN AN ELY COMPONENT...WHICH WILL ALLOW
  LOW LEVEL TEMPERATURES TO REMAIN CLOSE TO FREEZING.
  THUS...SNOW...WHICH HAS BEEN MODERATE TO HEAVY AT TIMES DURING THE
  MORNING WILL CONTINUE THROUGH THE AFTERNOON...WITH RATES
  OCCASIONALLY APPROACHING 1 IN/HR. HOWEVER...MODEL FORECAST GUIDANCE
  INDICATES THAT DRY AIR IN THE MID LEVELS ALONG WITH WEAKENING ASCENT
  WILL SPREAD ACROSS THE REGION FROM S TO N DURING THE LATE
  AFTERNOON/EARLY EVENING AS THE UPPER IMPULSE LIFTS N...WHICH SHOULD
  LEAD TO RAPIDLY DECREASING SNOWFALL RATES.
 
  ..GARNER.. 02/24/2010
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Hype Cane or Real Bad Storm Thurs/Friday? - BobbiStorm, 2/23/2010, 9:10 pm
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