MESOSCALE DISCUSSION 0554
   NWS STORM PREDICTION CENTER NORMAN OK
   1022 PM CDT MON APR 23 2007
   
   AREAS AFFECTED...PORTIONS W-CENTRAL/NW TX.
   
   CONCERNING...TORNADO WATCH 167...
   
   VALID 240322Z - 240445Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 167 CONTINUES.
   
   SBCINH INCREASES SUBSTANTIALLY WITH EWD EXTENT ACROSS NWRN/N-CENTRAL
   TX...WHICH INDICATES THAT HORIZONTAL SHRINKING TREND EVIDENT IN
   REFLECTIVITY IMAGERY SHOULD CONTINUE FOR SUPERCELL N ABI.  BEFORE
   THIS STORM DISSIPATES COMPLETELY...HOWEVER...IT STILL MAY POSE
   THREAT OF LARGE HAIL...STG-SVR GUSTS AND PERHAPS A TORNADO.
   
   MEANWHILE CONVECTION ACROSS GARZA/KENT/DICKENS COUNTIES HAS
   CONSOLIDATED INTO POTENTIALLY TORNADIC SUPERCELL WHICH...ACCORDING
   TO MODIFIED RUC SOUNDINGS...BARELY HAS SFC-BASED EFFECTIVE INFLOW
   LAYER.  AS FARTHER SE...MODIFIED RAOBS AND RUC SOUNDINGS SUGGEST
   STRENGTHENING SBCINH WITH TIME ACROSS NW TX IN PROJECTED PATH OF
   THIS ACTIVITY...INDICATING THREAT SHOULD NOT EXTEND SPATIALLY E OF
   PRESENT WW AREA.  LOCAL WW EXTENSION IN TIME MAY BE REQUIRED -- FOR
   A FEW COUNTIES IN PATH OF THIS ACTIVITY -- BEFORE IT DISSIPATES. 
   OTHERWISE...CONVECTIVE INITIATION WILL BECOME LESS PROBABLE WITH
   TIME...AND WW OUTSIDE THOSE LOCALIZED THREATS MAY BE ALLOWED TO
   EXPIRE AS SCHEDULED AT 4Z.
   
   ..EDWARDS.. 04/24/2007
   
   
   ATTN...WFO...FWD...OUN...SJT...LUB...MAF...
   
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