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Mesoscale Discussion 590
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   MESOSCALE DISCUSSION 0590
   NWS STORM PREDICTION CENTER NORMAN OK
   0243 PM CDT SUN MAY 10 2015

   AREAS AFFECTED...SOUTHEAST SD/EASTERN NEB/SOUTHWEST MN/WESTERN IA

   CONCERNING...TORNADO WATCH 156...

   VALID 101943Z - 102115Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 156 CONTINUES.

   SUMMARY...SEVERE HAIL/WIND POTENTIAL CONTINUES ALONG WITH THE RISK
   FOR A COUPLE OF TORNADOES...ESPECIALLY ACROSS SOUTHEAST SD/WESTERN
   IA INTO FAR SOUTHWEST MN. TORNADO WATCH 156 CONTINUES UNTIL 02Z.

   DISCUSSION...A SURFACE LOW CONTINUES TO DEEPEN/MOVE NORTHEASTWARD
   NEAR THE SIOUX FALLS AREA...WITH PRECEDING PRESSURE FALLS MAXIMIZED
   AT MID-AFTERNOON ACROSS SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA IN
   VICINITY OF A WARM FRONT THAT EXTENDS SOUTHEASTWARD FROM THE SURFACE
   LOW ACROSS WESTERN/SOUTH-CENTRAL IA. LOW TO MID-TROPOSPHERIC FLOW IS
   BECOMING INCREASINGLY UNIDIRECTIONAL OVER TIME...WHICH WILL CONTINUE
   TO LEAD TO A COMMONALITY OF STORM CLUSTERS/BOWING LINEAR SEGMENTS
   WITH HAIL/WIND THE PRIMARY RISKS. A 55 KT WIND GUST WAS MEASURED IN
   TEKAMAH NEB AS 1902Z. THAT SAID...PARTICULARLY JUST EAST-NORTHEAST
   OF THE SURFACE LOW AND WARM FRONTAL VICINITY...THE POTENTIAL FOR
   SEMI-DISCRETE SUPERCELLS WITH A TORNADO THREAT WILL CONTINUE THROUGH
   THE LATE AFTERNOON HOURS AMID SOUTHEASTERLY LOW-LEVEL WINDS WITH 0-1
   KM SRH ESTIMATED TO BE 200+ M2/S2 AS SUPPORTED PER REGIONAL WSR-88D
   VWP DATA.

   ..GUYER.. 05/10/2015


   ATTN...WFO...MPX...DMX...FSD...OAX...

   LAT...LON   43609787 44529799 44259558 40979461 41719643 43609787 

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Page last modified: May 10, 2015
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