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Mesoscale Discussion 1735
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   MESOSCALE DISCUSSION 1735
   NWS STORM PREDICTION CENTER NORMAN OK
   0552 PM CDT SAT AUG 22 2015

   AREAS AFFECTED...CENTRAL/SOUTHERN MN AND NORTHERN IA/FAR WESTERN WI

   CONCERNING...TORNADO WATCH 497...

   VALID 222252Z - 230015Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 497 CONTINUES.

   SUMMARY...THE POTENTIAL FOR DAMAGING WINDS...SEVERE HAIL AND A
   COUPLE OF TORNADOES WILL CONTINUE TO SPREAD EASTWARD ACROSS
   CENTRAL/SOUTHERN MN AND NORTHERN IA/FAR WEST-CENTRAL WI THROUGH
   EARLY EVENING. TORNADO WATCH 497 CONTINUES UNTIL 04Z.

   DISCUSSION...A COLD FRONT CONTINUES TO STEADILY PROGRESS EASTWARD
   ACROSS WEST-CENTRAL/SOUTHERN MN AND NORTHWEST IA LATE THIS
   AFTERNOON...ROUGHLY ALONG A LINE FROM ALEXANDRIA/REDWOOD
   FALLS/WORTHINGTON MN TO SPENCER/STORM LAKE IA AS OF 530 PM
   CDT/2230Z. INCREASINGLY LINEAR CONVECTION CONTINUES TO EVOLVE
   PARTICULARLY ACROSS NORTHERN IA IMMEDIATELY AHEAD OF THE
   FRONT...WHILE A DISTINCTLY SEPARATE PRE-FRONTAL BAND /LIKELY RELATED
   TO LOW-LEVEL CONFLUENCE AND-OR DIFFERENTIAL HEATING/ CONTINUES TO
   SPREAD NORTHEASTWARD ACROSS EAST-CENTRAL MN IN AREAS W/NW OF THE
   TWIN CITIES. THE MAIN TORNADO THREAT WILL BE WITH ANY SURFACE-ROOTED
   STORMS OCCURRING AHEAD OF THE COLD FRONT ACROSS FAR EASTERN
   MN/POSSIBLY FAR-WEST-CENTRAL WI. LATEST WSR-88D VWP DATA FROM
   MINNEAPOLIS FEATURES VERY STRONG LOW/MID-LEVEL SOUTH-SOUTHWESTERLY
   WINDS WITH STRONG NEAR-GROUND SOUTHEASTERLY WINDS CONTRIBUTING TO
   400+ 0-1 KM SRH. FARTHER WEST...A MORE COMPLEX/LINEAR CONVECTIVE
   MODE WITH RELATED DAMAGING WIND AND SOME TORNADO/HAIL RISK WILL
   EXIST CLOSER TO THE EASTWARD-MOVING FRONT AS ADDITIONAL CELL
   MERGERS/COLD POOL DEVELOPMENT LEADS TO UPSCALE LINEAR CONVECTIVE
   GROWTH THROUGH EARLY EVENING.

   ..GUYER.. 08/22/2015


   ATTN...WFO...DLH...MPX...DMX...FSD...

   LAT...LON   46039487 46089233 44079317 42289314 42479529 44359497
               46039487 

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