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Mesoscale Discussion 63
MD 63 graphic
   
   MESOSCALE DISCUSSION 0063
   NWS STORM PREDICTION CENTER NORMAN OK
   0108 AM CST MON FEB 02 2004
   
   AREAS AFFECTED...NERN MO/SERN IA AND MUCH OF CENTRAL IL
   
   CONCERNING...FREEZING RAIN 
   
   VALID 020708Z - 021115Z
   
   FREEZING RAINFALL RATES RANGING FROM 0.05-0.10 INCHES PER 3 HOURS IS
   EXPECTED TO SPREAD NWD ACROSS MUCH OF CENTRAL IL AND EXTREME NERN MO
   INTO EXTREME SERN IA DURING THE NEXT 2-3 HOURS...REACHING PORTIONS
   OF NWRN IL/FAR EAST CENTRAL IA BY 10Z.
   
   REGIONAL RADARS SHOW A LARGE AREA OF RAINFALL MOVING NWD ACROSS ERN/
   SERN MO AND SWRN IL WITH RAINFALL RATES AROUND 0.03 IN/HR.  THIS
   ACTIVITY IS ASSOCIATED WITH LOW-LEVEL WAA AS A SLY 40 KT LLJ
   INDICATED BY VWP DATA AT STL/MEM/PAH...NOSES INTO THIS REGION. 00Z
   SOUNDINGS FROM ERN IA/CENTRAL IL SHOWED DRY LOW-MID LEVELS WITH
   CURRENT SURFACE WET-BULB TEMPERATURES ACROSS THE AREA OF CONCERN IN
   THE MID-UPPER 20S.  LARGE SCALE ASCENT WILL INCREASE AS THE SRN
   PLAINS UPPER TROUGH BECOMES NEGATIVELY TILTED AND BEGINS TO LIFT
   NEWD TOWARD THE MID MS VALLEY DURING THE NEXT 6-12 HOURS.  THIS
   ASCENT COMBINED WITH PERSISTENT LOW-LEVEL WAA WILL PROVE SUFFICIENT
   TO MOISTEN THE BOUNDARY LAYER...RESULTING IN A PERIOD OF FREEZING
   RAIN CONTINUING THROUGH THE MORNING /BEYOND 12Z/.
   
   ..PETERS.. 02/02/2004
   
   
   ATTN...WFO...LOT...ILX...LSX...DVN...
   
   39348976 39499131 40619179 41949044 41008868 40458790
   39778782 39418818 
   
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