Heavy Snow OH
Posted by JAC on 2/5/2010, 12:07 pm


MESOSCALE DISCUSSION 0099
  NWS STORM PREDICTION CENTER NORMAN OK
  1049 AM CST FRI FEB 05 2010
 
  AREAS AFFECTED...MUCH OF SRN OH...NRN WV AND EXTREME SW PA
 
  CONCERNING...HEAVY SNOW
 
  VALID 051649Z - 052145Z
 
  SNOWFALL RATES OF 1 INCH PER HOUR ARE EXPECTED ACROSS MUCH OF SRN
  OH...NRN WV AND EXTREME SW PA THIS AFTERNOON.
 
  A DEEP UPPER LEVEL LOW OVER THE CNTRL PLAINS AS NOTED ON 16Z WV
  IMAGERY WILL CONTINUE TO TRACK ESE INTO THE MID MISSISSIPPI VALLEY
  DURING THE AFTERNOON. MOISTURE WAS STREAMING NWD INTO THE OHIO
  VALLEY VIA A SLY TO SELY LLJ OF 30-40 KTS. 16Z SFC ANALYSIS SHOWED
  THE FREEZING LINE NORTH OF THE OHIO RIVER ACROSS CNTRL OH STRETCHING
  EWD INTO SW PA. EXPECT THE FREEZING LINE TO REMAIN NEARLY STATIONARY
  THROUGH THE DAY BEFORE SLOWLY SAGGING SWD CLOSER TO 00Z.
  THEREFORE...LOCATIONS NEAR THE OHIO RIVER WILL LIKELY SEE EITHER
  JUST RAIN OR A RAIN/SNOW MIX AS TEMPERATURES APPROACH THE WET BULB
  ZERO MARK.
 
  FURTHER NORTH...LIGHT TO MODERATE SNOWFALL WAS ALREADY FALLING
  ACROSS PORTIONS OF CNTRL OH AND SNOWFALL RATES WILL INCREASE THROUGH
  THE AFTERNOON. FORECAST SOUNDINGS INDICATE TEMPERATURES WILL REMAIN
  AT OR JUST BELOW FREEZING NEAR THE SFC WITH STEEP MID LEVEL LAPSE
  RATES THROUGH A DEEP SATURATED LAYER. HEAVY...WET SNOWFALL WILL
  FURTHER BE SUPPORTED BY AN AREA OF DIFFERENTIAL PVA AND A
  DEFORMATION ZONE THAT WILL DEVELOP OVER THE OHIO VALLEY AS THE UPPER
  LOW MOVES ESE. THIS WILL CONTRIBUTE TO AN AREA OF LOW LEVEL
  CONVERGENCE AND ENHANCED LIFT JUST NORTH OF THE OHIO RIVER INTO FAR
  NRN WV AND SW PA. GIVEN THE LOCATION OF LOW LEVEL CONVERGENCE THIS
  AFTERNOON...EXPECT THE HEAVIEST SNOW BAND TO SET UP NEAR ILN TO DAY
  EWD THROUGH OSU AND INTO PIT.
 
  ..STOPPKOTTE.. 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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