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Mesoscale Discussion 2015
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   MESOSCALE DISCUSSION 2015
   NWS STORM PREDICTION CENTER NORMAN OK
   1157 AM CST SUN NOV 17 2013

   AREAS AFFECTED...ERN IL...WRN IND

   CONCERNING...TORNADO WATCH 561...562...

   VALID 171757Z - 171930Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 561...562...CONTINUES.

   SUMMARY...GREATEST NEAR-TERM SIGNIFICANT TORNADO RISK IS APPROACHING
   THE I-55 AND I-57 CORRIDORS BETWEEN JOLIET AND KANKAKEE AND PERHAPS
   THE SRN PORTIONS OF THE CHICAGOLAND METRO AREA.

   DISCUSSION...AN INTENSE SUPERCELL OVER NWRN LIVINGSTON COUNTY IL HAS
   HAD A TORNADO CYCLONE EVIDENT IN RADAR IMAGERY FOR NEARLY 50 MILES.
   DOWNSTREAM ENVIRONMENT REMAINS SUPPORTIVE FOR A LONG-TRACK
   SIGNIFICANT TORNADO GIVEN A SICKLE-CELL ENLARGED HODOGRAPH STRUCTURE
   SAMPLED IN ILX VWP DATA AND SURFACE TEMPERATURES WARMING INTO THE
   LOWER 70S IMMEDIATELY AHEAD OF THE BROKEN BAND OF SUPERCELLS.
   ADDITIONAL LONG-TRACK/SIGNIFICANT TORNADOES MAY EVOLVE E/NEWD OUT OF
   PERSISTENT SUPERCELLS CURRENTLY IN MCLEAN AND CHRISTIAN COUNTIES IN
   CNTRL IL.

   ..GRAMS.. 11/17/2013


   ATTN...WFO...IWX...IND...LOT...ILX...

   LAT...LON   42158783 41638684 40918652 39768683 39518758 39408852
               39488899 39988899 41478854 41868812 42158783 

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Page last modified: November 17, 2013
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