Heavy Snow - Shenadoah Valley
Posted by JAC on 2/5/2010, 7:38 am




MESOSCALE DISCUSSION 0097
  NWS STORM PREDICTION CENTER NORMAN OK
  0606 AM CST FRI FEB 05 2010
 
  AREAS AFFECTED...ERN WV...WRN/CNTRL VA
 
  CONCERNING...HEAVY SNOW
 
  VALID 051206Z - 051800Z
 
  HEAVY SNOW WILL SPREAD/DEVELOP NWD ACROSS PARTS OF ERN WV AND
  WRN/CNTRL VA THROUGH LATE MORNING.  SNOW RATES WILL LIKELY EXCEED
  ONE INCH PER HOUR AT TIMES.
 
  STRONG LOW-MID LEVEL WARM ADVECTION HAS AIDED IN THE INTENSIFICATION
  OF A WARM CONVEYOR BELT THAT STRETCHES FROM AL/GA...NEWD ATOP WEDGE
  FRONT EAST OF THE APPALACHIANS.  ALTHOUGH BOUNDARY LAYER IS NOT
  PARTICULARLY COLD EAST OF THE HIGHER TERRAIN...MOSTLY IN THE LOWER
  30S...THERMAL STRUCTURE IS ADEQUATELY COLD FOR HEAVY SNOW ACROSS
  BOTH THE HIGHER AND LOWER ELEVATIONS OVER MUCH OF ERN WV AND
  WRN/CNTRL VA.  THE PRIMARY CONCERN THROUGH 18Z WILL BE ALONG AND
  EAST OF THE ALLEGHENY MOUNTAINS WHERE UPSLOPE FLOW MAY ALSO ENHANCE
  PRECIPITATION RATES.  HEAVY SNOW HAS ALREADY DEVELOPED ACROSS MUCH
  OF WRN NC AND SHOULD BE NOTED SHORTLY FARTHER NORTH AS LOW LEVELS
  MOISTEN AND DEEP LAYER BECOMES SATURATED.  PERSISTENT STRONG WARM
  ADVECTION WILL LIKELY RESULT IN THE CHANGE-OVER FROM SNOW TO ICE
  PELLETS OR PERHAPS EVEN FREEZING RAIN ACROSS PARTS OF WRN VA AND
  EXTREME SRN WV BY LATE MORNING AS 850-700MB LAYER BEGINS TO NUDGE
  ABOVE FREEZING.  SNOW RATES WILL LIKELY EXCEED ONE INCH PER HOUR AT
  TIMES...THOUGH CONSIDERABLY LESS ACROSS NRN PORTIONS OF THE AREA
  UNTIL MID DAY.
 
  ..DARROW.. 02/05/2010
 
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Major Winter Event: Mid Atlantic & Ohio Valley. Blizzard Warnings Up DE & NJ Coast - JAC, 2/4/2010, 2:29 pm
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