MESOSCALE DISCUSSION 0660
   NWS STORM PREDICTION CENTER NORMAN OK
   0611 PM CDT FRI MAY 01 2009
   
   AREAS AFFECTED...NRN AR...WRN TN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 223...
   
   VALID 012311Z - 020015Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 223
   CONTINUES.
   
   THREAT OF SEVERE HAIL/DMGG WINDS REMAINS OVER WW223...WITH
   REDEVELOPMENT STILL POSSIBLE ACROSS CNTRL PORTIONS OF THE WATCH. 
   
   FAVORABLE MOISTURE/UPPER 60S DEW POINTS CONTINUE TO ALLOW
   THUNDERSTORMS TO DEVELOP ALONG A SLOWLY SAGGING COLD FRONT...AND
   AHEAD OF A SUBTLE VORT MAX...NOW NOTED ON WV IMAGERY NEAR THE SWRN
   MO/NWRN AR BORDER. VISIBLE SATELLITE IMAGERY SHOWS WHAT APPEARS TO
   BE A GRAVITY WAVE MOVING INTO SRN AR. THIS HAS LIKELY BRIEFLY
   STABILIZED THE AIRMASS BEHIND IT IN THE CNTRL PORTIONS OF THE
   WATCH...SUPPORTED BY GENERAL NON-CONVECTIVE APPEARANCE OF CLOUDS AND
   LACK OF DEVELOPMENT IN THESE AREAS. HOWEVER...REDEVELOPMENT STILL
   REMAINS A POSSIBILITY IN ADVANCE OF THE APPROACHING VORT MAX...AND
   AS THINNING CLOUD COVER ALLOWS HEATING/DESTABILIZATION ONCE AGAIN.
   GIVEN A MODERATE TO VERY UNSTABLE ATMOSPHERE COMBINED WITH
   MODERATELY STRONG UNIDIRECTIONAL FLOW...PRIMARY THREATS OF DMGG
   WINDS/LARGE HAIL WILL CONTINUE TO BE A THREAT ACROSS THE WATCH AREA.
   
   ..HURLBUT.. 05/01/2009
   
   
   ATTN...WFO...PAH...MEG...LZK...SGF...TSA...
   
   LAT...LON   35049443 36499440 36508831 35078831 35049443