Freezing Rain to Develop across IA to Chicago
Posted by JAC on 12/23/2009, 7:56 am
http://www.iowaroadconditions.org/roadConditions.asp?area=IA_statewide&textOnly=False

http://wrc.gettingaroundillinois.com/winterroadconditions/






MESOSCALE DISCUSSION 2267
  NWS STORM PREDICTION CENTER NORMAN OK
  0644 AM CST WED DEC 23 2009
 
  AREAS AFFECTED...SERN NEB...SRN IA...NRN IL
 
  CONCERNING...FREEZING RAIN
 
  VALID 231244Z - 231645Z
 
  FREEZING RAIN WITH RATES UP TO 0.05 IN/HR IS LIKELY THROUGH THE
  MORNING HOURS FROM SERN NEB INTO NRN IL.
 
  LATEST SURFACE ANALYSIS SHOWS A RELATIVELY BROAD WARM FRONT
  EXTENDING FROM ERN KS INTO SRN IL. A W-E ORIENTED ZONE OF WARM
  ADVECTION PRECIPITATION CURRENTLY EXISTS ALONG AND N OF THIS
  BOUNDARY AS OF 12Z...AND WILL PERSIST AS IT GRADUALLY SHIFTS NWD.
  SURFACE TEMPERATURES...AS WELL AS WET BULB TEMPERATURES...ARE AT OR
  BELOW FREEZING ALONG AND N OF A BIE-RDK-OTM-MLI LINE AS OF 12Z. THE
  FREEZING LINE IS LIKELY TO GRADUALLY SHIFT NWD AS WELL DUE TO LOW
  LEVEL WARM ADVECTION...EXTENDING APPROXIMATELY ALONG A
  OFF-TNU-DVN-VYS LINE BY 18Z. OMAHA AND DES MOINES WILL LIKELY BE
  AFFECTED BY ICING THIS MORNING...BEFORE TEMPERATURES RISE ABOVE
  FREEZING THIS AFTERNOON.
 
  ..JEWELL.. 12/23/2009


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Big Storm for Central CONUS - JAC, 12/23/2009, 7:48 am
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