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Mesoscale Discussion 1578
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   MESOSCALE DISCUSSION 1578
   NWS STORM PREDICTION CENTER NORMAN OK
   0949 PM CDT MON AUG 18 2014

   AREAS AFFECTED...NE IA...SRN WI...EXTREME SE MN/NRN IL

   CONCERNING...SEVERE THUNDERSTORM WATCH 466...

   VALID 190249Z - 190345Z

   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 466
   CONTINUES.

   SUMMARY...ISOLATED DAMAGING WINDS AND MARGINALLY SEVERE HAIL WILL
   PERSIST FOR A FEW MORE HOURS...WITH OVERALL RISK ANTICIPATED TO
   GRADUALLY DIMINISH OVERNIGHT OVER PARTS OF SRN WI.

   DISCUSSION...GREATEST NEAR-TERM SEVERE RISK EXISTS IN THE FORM OF
   DAMAGING WINDS WITH A BULGING SHORT-LINE SEGMENT NEAR/JUST N OF THE
   LA CROSSE AREA. THIS PORTION OF A SEMI-ORGANIZED CONVECTIVE CLUSTER
   SHOULD CONTINUE E/SE ALONG AN OUTFLOW BOUNDARY LEFTOVER FROM
   DECAYING CONVECTION ACROSS ERN WI AND LK MI. LSE VWP DATA SAMPLED
   LITTLE CHANGE IN DIRECTION/SPEED WITH HEIGHT...BUT 30-35 KT
   LOW-LEVEL W/SWLYS SHOULD FAVOR POTENTIAL FOR STRONG WIND GUSTS
   CAPABLE OF LOCALLY DAMAGING WINDS. THIS RISK SHOULD PERSIST ALONG
   THE NRN PERIPHERY OF RESIDUAL WARM SURFACE TEMPERATURES /IN THE
   MIDDLE TO UPPER 70S/ ACROSS SW WI/NE IA PRIOR TO CONVECTION
   OVERSPREADING THE MORE STABLE/PREVIOUSLY OVERTURNED AIR MASS ACROSS
   MOST OF S-CNTRL/SE WI.

   ..GRAMS.. 08/19/2014


   ATTN...WFO...GRB...LOT...MKX...DVN...ARX...DMX...

   LAT...LON   44409150 44289029 44088940 43788898 43368852 42998824
               42728838 42638857 42368910 42289091 42339232 42499302
               42669333 43209337 43549245 44409150 

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Page last modified: August 19, 2014
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