MESOSCALE DISCUSSION 1951
   NWS STORM PREDICTION CENTER NORMAN OK
   0955 PM CDT THU AUG 11 2011
   
   AREAS AFFECTED...WY...ND...SD
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 768...
   
   VALID 120255Z - 120400Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 768
   CONTINUES.
   
   RECENT TRENDS IN REFLECTIVITY LOOP SUGGEST STORM MERGER AND GREATER
   MESOSCALE ORGANIZATION TO THE CONVECTION MOVING ACROSS NWRN SD. THIS
   UPSCALE ORGANIZATION TO A BOWING LINE MOVING AT NEARLY 50KT OCCURRED
   AS SUPERCELLS MOVING OUT OF SERN MT MERGED WITH ROTATING UPDRAFTS
   DROPPING SEWD ACROSS HARDING COUNTY SD. RESULTING STORMS ARE
   FAVORABLY ORIENTED TO THE FASTER WLY FLOW ALOFT AND COULD PRODUCE
   50-60KT WINDS INTO NRN MEADE AND SRN PERKINS COUNTIES WITHIN THE
   HOUR. AIRMASS FARTHER DOWNSTREAM WAS STABILIZED BY EARLIER COMPLEX
   AND IT REMAINS QUESTIONABLE AS TO WHETHER A SEVERE THREAT WILL EXIST
   TO THE EAST OF WATCH 768 LATER TONIGHT.
   
   ..CARBIN.. 08/12/2011
   
   
   ATTN...WFO...ABR...BIS...UNR...BYZ...
   
   LAT...LON   45090589 45140409 46620396 46560206 45440198 45410148
               45000135 44870111 44170300 44180498 43500518 43520594
               45090589