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Mesoscale Discussion 990
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   MESOSCALE DISCUSSION 0990
   NWS STORM PREDICTION CENTER NORMAN OK
   0331 PM CDT THU JUN 17 2010
   
   AREAS AFFECTED...WRN/CNTRL MN...WRN IA...ERN NEB
   
   CONCERNING...TORNADO WATCH 334...335...
   
   VALID 172031Z - 172130Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 334...335...CONTINUES.
   
   GREATEST NEAR-TERM TORNADO/SIGNIFICANT HAIL THREAT APPEARS TO LIE
   ACROSS W-CNTRL MN WITH DEVELOPING SUPERCELLS INVOF AXN. SURFACE
   TEMPERATURES IMMEDIATELY DOWNSTREAM OF THIS ACTIVITY HAVE NOW WARMED
   INTO THE MIDDLE 80S WITHIN AN AXIS OF MIDDLE TO UPPER 60S DEW POINTS
   PER ASOS OBSERVATIONS. GIVEN PRESENCE OF 50 KT SLY FLOW AT 2-3 KM
   AGL PER WOOD LAKE MN PROFILER...ENLARGED LOW-LEVEL HODOGRAPHS WILL
   SUPPORT EFFECTIVE SRH AOA 300 M2/S2 AND MAINTENANCE OF ONGOING
   SUPERCELLULAR STRUCTURES.
   
   FARTHER S...TSTM INITIATION APPEARS APT TO COMMENCE SHORTLY FROM
   SWRN MN TOWARDS THE MO RIVER ALONG THE NEB/IA BORDER WITH INCREASED
   DEEPENING OF CU FIELD IN VISIBLE SATELLITE IMAGERY. MODIFIED 18Z OAX
   RAOB WOULD INDICATE MINIMAL CIN REMAINS WITHIN THIS REGION. THE
   PRESENCE OF A VERY UNSTABLE AIR MASS /MLCAPE GENERALLY AOA 3500
   J/KG/ AND STRONG DEEP-LAYER SHEAR WILL PROMOTE EVOLUTION TO INTENSE
   SUPERCELLS...CAPABLE OF PRODUCING VERY LARGE HAIL AND TORNADOES.
   
   ..GRAMS.. 06/17/2010
   
   
   ATTN...WFO...DLH...MPX...DMX...FGF...FSD...OAX...
   
   LAT...LON   46709593 47319529 47599442 47569358 47199319 45009330
               42009446 41239575 41069700 41409691 42319641 44099596
               45509602 46709593 
   
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