Sitting right on the 5400 thickness line. Ait saturated to 600mb.
Posted by JAC on 1/31/2011, 8:59 pm
http://www.crh.noaa.gov/ind/?n=webbriefing






MESOSCALE DISCUSSION 0057
  NWS STORM PREDICTION CENTER NORMAN OK
  0656 PM CST MON JAN 31 2011
 
  AREAS AFFECTED...ERN INDIANA...NERN AND CNTRL OHIO
 
  CONCERNING...WINTER MIXED PRECIPITATION
 
  VALID 010056Z - 010600Z
 
  MIXED WINTER PRECIPITATION CURRENTLY FALLING OVER MUCH OF CNTRL AND
  NRN INDIANA WILL CONTINUE TO TRACK E/NE INTO OHIO THIS EVENING.
  FREEZING RAIN WITH SLEET AT TIMES IS EXPECTED ALONG THE I-70
  CORRIDOR FROM INDIANAPOLIS TO COLUMBUS THEN NEWD TOWARD MANSFIELD
  AND CANTON BY 03Z-06Z. FURTHER SOUTH OF I-70 AND TOWARD THE OHIO
  RIVER...PRECIPITATION WILL BE MUCH LIGHTER.  ACROSS THE NORTHERN
  PORTIONS OF THE MCD AREA FROM NEAR FORT WAYNE TO FINDLAY AND
  TOLEDO...MODERATE TO HEAVY SNOWFALL IS EXPECTED WITH RATES
  APPROACHING ONE INCH PER HOUR THROUGH AT LEAST 06Z.
 
  ALL OF THIS IS RELATED TO REGION OF WAA/ISENTROPIC UPGLIDE IN
  VICINITY OF 292K-295K LAYER AND 850 MB FRONTOGENETIC BAND NOW
  LOCATED ACROSS CNTRL INDIANA. PRECIPITATION IS EXPECTED TO CONTINUE
  THROUGH MUCH OF THE EVENING AND INTO THE OVERNIGHT HOURS AS MID
  LEVEL JET AROUND 40 KT AND VORTICITY MAX ALIGN TO ENHANCE DEEP LAYER
  LIFT AND MAINTAIN/STRENGTHEN 850-700 MB FRONTOGENETIC BAND. IT
  SHOULD ALSO BE NOTED THAT STEEP LAPSE RATES AND SOME MODEST
  INSTABILITY NOTED ON FORECAST SOUNDINGS COULD LEAD TO SOME BRIEF
  PERIODS OF CONVECTIVE BANDS WHERE RATES WOULD EXCEED THOSE MENTIONED
  ABOVE.
 
  FORECAST SOUNDINGS INDICATE WARM NOSE OF 3-6 C ACROSS MUCH OF
  W-CNTRL AND CNTRL OHIO TONIGHT...ALLOWING PRECIPITATION TO FULLY
  MELT BEFORE REACHING THE NEAR SFC FREEZING LAYER. FURTHER N...THERE
  MAY BE A TRANSITION ZONE WHERE SLEET MIXES WITH FREEZING RAIN AND/OR
  SNOW BEFORE PROFILES BECOME FAVORABLE FOR DENDRITES TO REMAIN FROZEN
  AND FALL AS SNOW ACROSS NERN INDIANA AND NWRN OHIO.
 
  ..STOPPKOTTE.. 02/01/2011




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Conclues PDS Winter Storm - JAC, 1/30/2011, 8:07 pm
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