MESOSCALE DISCUSSION 1623
   NWS STORM PREDICTION CENTER NORMAN OK
   1102 PM CDT SUN JUL 19 2009
   
   AREAS AFFECTED...PARTS OF WRN/CNTRL DAKOTAS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 605...
   
   VALID 200402Z - 200500Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 605
   CONTINUES.
   
   REMAINING VALID PORTION OF WW WILL PROBABLY BE ALLOWED TO EXPIRE AS
   SCHEDULED AT 06Z.
   
   MODELS SUGGEST THAT THE LOWER/MID TROPOSPHERIC THERMAL RIDGE
   EXTENDING NORTHEASTWARD OUT OF THE PLATEAU/ROCKIES REGION WILL NOT
   BREAK DOWN UNTIL LATER TONIGHT.  THE WARM MID-LEVEL TEMPERATURES
   ASSOCIATED WITH THIS FEATURE...COUPLED WITH DIURNAL COOLING NOW
   UNDERWAY ACROSS THE HIGHER PLAINS...APPEAR TO BE SUPPRESSING ONGOING
   STORMS WITHIN THE WARM ADVECTION REGIME AHEAD OF A PRE-FRONTAL
   SURFACE TROUGH.  STRONG GUSTY WINDS MAY STILL ACCOMPANY A WEAKENING
   STORM CLUSTER BETWEEN PHILIP AND PIERRE SD THROUGH 05-06Z.  BUT...IN
   GENERAL...THE SEVERE POTENTIAL APPEARS TO BE DIMINISHING.
   
   ..KERR.. 07/20/2009
   
   
   ATTN...WFO...ABR...BIS...UNR...
   
   LAT...LON   44080192 44900187 46010142 47060136 47710083 47539977
               46209949 44889955 44269987 43660043 43620113 43680171
               44080192