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Mesoscale Discussion 1123
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   MESOSCALE DISCUSSION 1123
   NWS STORM PREDICTION CENTER NORMAN OK
   0608 PM CDT MON JUN 22 2015

   AREAS AFFECTED...SERN IA...NRN IL

   CONCERNING...TORNADO WATCH 335...

   VALID 222308Z - 230015Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 335 CONTINUES.

   SUMMARY...CONVECTION IS EXPECTED TO EXPAND ACROSS WRN AND NRN
   PORTIONS OF WW335 OVER THE NEXT FEW HOURS.

   DISCUSSION...CONVECTION IS GRADUALLY EXPANDING IN AREAL COVERAGE
   ALONG A PRE-FRONTAL CORRIDOR FROM SCNTRL IA...NEWD INTO NWRN IL. 
   ALONG THIS ZONE...ISOLATED SUPERCELLS HAVE DEVELOPED WITH ONE
   LONGER-LIVED UPDRAFT PROPAGATING SEWD ACROSS MONROE COUNTY IA.  OVER
   THE NEXT FEW HOURS IT APPEARS TSTM ACTIVITY WILL INCREASE
   SUBSTANTIALLY INTO NRN IL ALONG/NEAR OLD OUTFLOW BOUNDARY THAT IS
   LOSING ITS IDENTITY.  ADDITIONALLY...SHOWERS ARE SLOWLY DEEPENING
   ACROSS NWRN MO BUT THIS CONVECTION MAY STRUGGLE A BIT DUE TO VERY
   WARM TEMPERATURES ALOFT.

   ..DARROW.. 06/22/2015


   ATTN...WFO...LOT...ILX...LSX...DVN...DMX...EAX...

   LAT...LON   42319330 41358827 39598824 40579331 42319330 

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