MESOSCALE DISCUSSION 0377
   NWS STORM PREDICTION CENTER NORMAN OK
   1125 AM CDT FRI MAR 30 2007
   
   AREAS AFFECTED...OK
   
   CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE 
   
   VALID 301625Z - 301730Z
   
   BETTER SEVERE POTENTIAL MAY NOT DEVELOP UNTIL LATER THIS
   AFTERNOON/EVENING...BUT TRENDS ARE BEING MONITORED FOR THE
   POSSIBILITY OF A WW.
   
   AS VIGOROUS SHORT WAVE TROUGH CONTINUES TO LIFT INTO/THROUGH THE
   SOUTHERN HIGH PLAINS...STRONGER MID/UPPER FORCING IS EXPECTED TO
   RAPIDLY SPREAD OUT OF NORTHWEST TEXAS THROUGH MUCH OF CENTRAL
   OKLAHOMA DURING THE 18-21Z TIME FRAME.  THIS WILL BE ACCOMPANIED BY 
   EXPANDING CLUSTER OR CLUSTERS OF CONVECTION.  SEVERE THREAT IN THE
   SHORT TERM ASSOCIATED WITH THIS ACTIVITY IS A BIT UNCERTAIN DUE...IN
   PART...TO CONSIDERABLE CLOUD COVER EAST OF STALLING FRONTAL BOUNDARY
   TO THE WEST OF THE INTERSTATE 35 CORRIDOR.  LOW-LEVEL LAPSE RATES
   PROBABLY WILL REMAIN WEAK...WITH LIMITED SURFACE HEATING. 
   AND...LOW-LEVEL WIND FIELDS/SHEAR ARE EXPECTED TO ONLY BEGIN TO
   SLOWLY STRENGTH.  LOCALLY EXCESSIVE RAINS MAY BE THE PRIMARY THREAT
   IN THE SHORT TERM DUE TO SEVERAL HOUR PERIOD OF HEAVY RAIN FALL. 
   PRIMARY SEVERE POTENTIAL ACROSS MUCH OF SOUTH CENTRAL INTO EASTERN
   OKLAHOMA SEEMS LIKELY TO BEGIN TO DEVELOP IN THE WAKE OF INITIAL
   NORTHWARD DEVELOPING CONVECTIVE CLUSTER... DURING THE 30/21Z-31/00Z
   TIME FRAME...AS UPPER SYSTEM DRAWS CLOSER AND SURFACE WAVE
   STRENGTHENS ALONG FRONTAL ZONE...ACCOMPANIED BY INCREASING VERTICAL
   SHEAR.
   
   ..KERR.. 03/30/2007
   
   
   ATTN...WFO...SHV...TSA...OUN...
   
   36179969 36969855 36909674 36649543 35359492 34339489
   33899641 34149771 34459881 34669937