MESOSCALE DISCUSSION 0438
   NWS STORM PREDICTION CENTER NORMAN OK
   0906 PM CDT THU APR 22 2004
   
   AREAS AFFECTED...104
   
   CONCERNING...TORNADO WATCH 105...
   
   VALID 230206Z - 230230Z
   
   SEVERE STORMS IN NWRN TX ARE EXPECTED TO GRADUALLY WEAKEN AND WW
   LIKELY WILL NOT BE REISSUED AT 03Z.
   
   HAIL AND HEAVY EXTREME RAINFALL AMOUNTS CONTINUE TO BE THE MAIN
   SEVER WEATHER THREATS ACROSS NWRN TX IN SRN CLAY..MONTAGUE AND COOKE
   COUNTIES. THE STORMS HAVE ALSO BUILT SLOWLY WSWWD INTO EXTREME
   NORTHERN JACK AND YOUNG COUNTIES. HOWEVER..THE EVENING SOUNDINGS AT
   OKC AND FTW SHOWED INVERSIONS BETWEEN 700 AND 850 MB. AS THE
   BOUNDARY LAYER CONTINUES TO SLOWLY COOL...THE SURFACE BASED PARCELS
   EVENTUALLY WILL NOT BE ABLE TO SUSTAIN THE FEED OF BOUNDARY LAYER
   MOISTURE/INSTABILITY. ALTHOUGH THE STORMS MAY REMAIN SEVERE FOR THE
   NEXT 1 TO 2 HOURS...THE WW IS NOT EXPECTED TO BE REISSUED WHEN THE
   CURRENT WW EXPIRES AT 03Z.
   
   ..IMY.. 04/23/2004
   
   
   ATTN...WFO...FWD...OUN...
   
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