MESOSCALE DISCUSSION 0820
   NWS STORM PREDICTION CENTER NORMAN OK
   0822 PM CDT WED MAY 13 2009
   
   AREAS AFFECTED...CNTRL/SWRN MO...NWRN AR...MUCH OF OK...FAR SERN KS
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 295...296...
   
   VALID 140122Z - 140215Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH
   295...296...CONTINUES.
   
   ADDITIONAL WW/S WILL LIKELY BE ISSUED PRIOR TO 03Z DOWNSTREAM OF
   WW/S 295/296.
   
   SEVERAL LINE SEGMENTS WITH EMBEDDED/SEMI-DISCRETE SUPERCELLS
   CONTINUE TO EVOLVE ALONG COLD FRONT BOUNDARY THAT EXTENDED ROUGHLY
   FROM 20 E IRK TO 20 E CSM AS OF 01Z. LARGE HAIL AND BRIEF TORNADOES
   HAVE BEEN THE PRIMARY THREATS THUS FAR. WHILE TRANSITION TO AN
   ELONGATED QLCS HAS APPEARED TO BE DELAYED TO SOME EXTENT...STORM
   INTERACTIONS AND CONVERGENCE ALONG THE FRONT/OUTFLOW BOUNDARIES
   SHOULD BE SUFFICIENT FOR ADDITIONAL DEVELOPMENT IN BETWEEN ONGOING
   CLUSTERS. AMBIENT WARM SECTOR AIR MASS REMAINS VERY UNSTABLE BASED
   ON MODIFIED 00Z OUN/SGF RAOBS WITH LARGE LOW-LEVEL HODOGRAPHS. THIS
   SUGGEST OVERALL STORM INTENSITY WILL BE MAINTAINED AS ACTIVITY
   SHIFTS S/EWD THIS EVENING...WITH ADDITIONAL WW/S LIKELY BEING NEEDED
   FOR DOWNSTREAM OF WW/S 295/296. DAMAGING WINDS WITH EMBEDDED BOWING
   SEGMENTS SHOULD BECOME THE MAIN THREAT AS COLD POOL DEVELOPMENT
   LIKELY OCCURS.
   
   ..GRAMS.. 05/14/2009
   
   
   ATTN...WFO...LSX...LZK...SGF...EAX...TSA...ICT...OUN...
   
   LAT...LON   34779916 35339873 36569675 38129453 39129295 38629219
               38279142 37599162 36619235 35129421 34329618 34199784
               34409896 34779916