MESOSCALE DISCUSSION 0834
   NWS STORM PREDICTION CENTER NORMAN OK
   0132 AM CDT FRI MAY 09 2008
   
   AREAS AFFECTED...CENTRAL/EASTERN VA AND SOUTHERN MD INTO NORTHERN NC
   
   CONCERNING...TORNADO WATCH 283...
   
   VALID 090632Z - 090800Z
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 283 CONTINUES.
   
   TORNADO WATCH 283 CONTINUES UNTIL 07Z...A REPLACEMENT WATCH WILL BE
   NEEDED SOON. LOCALLY EXTENDED PORTIONS OF TORNADO WATCHES 280/282
   CONTINUE UNTIL 08Z. THE RISK FOR ISOLATED TORNADOES AND SEVERE
   HAIL/DAMAGING WINDS CONTINUES.
   
   WITH MID LEVEL TROUGH CROSSING THE UPPER OHIO RIVER VALLEY...LATEST
   SURFACE MESOANALYSIS FEATURES DEEPENING 1001 MB SURFACE LOW CROSSING
   WV EARLY THIS MORNING...WITH PRESSURE FALLS EVIDENT DOWNSTREAM FROM
   VA INTO THE CAROLINAS ALONG/SOUTH OF A SYNOPTIC WARM FRONT ACROSS VA
   INTO MD. EXPANSIVE PRECIPITATION/CONGEALED OUTFLOW ACROSS CENTRAL VA
   IS SERVING AS AN EFFECTIVE WARM FRONT...WITH THE STRONGEST STORMS
   OCCURRING ALONG THE VA/NC BORDER AS OF 0630Z...JUST AHEAD OF AN
   APPARENT MESOLOW. THIS SAME TREND/FOCUS SHOULD CONTINUE OVER THE
   NEXT FEW HOURS AS THE EFFECTIVE BOUNDARY ATTEMPTS TO LIFT
   NORTHWARD...WITH THE PRIMARY RISK ACROSS SOUTH CENTRAL/SOUTHEAST VA
   AND ADJACENT NC OVER THE NEXT FEWS. WITHIN THIS CORRIDOR...REGIONAL
   WSR-88D DERIVED WINDS ARE SAMPLING A 50+ KT SOUTHWESTERLY LOW LEVEL
   JET. ESTIMATED 0-1 KM SRH OF 300-500 M2/S2 WILL REMAIN FAVORABLE FOR
   A CONTINUED TORNADO THREAT AMIDST SURFACE DEWPOINTS GENERALLY IN THE
   MIDDLE 60S F. OTHERWISE...SEVERE HAIL/DAMAGING WIND GUSTS WILL
   REMAIN POSSIBLE.
   
   ..GUYER.. 05/09/2008
   
   
   ATTN...WFO...AKQ...MHX...LWX...RAH...RNK...GSP...
   
   36788036 37667846 38827674 37837538 35877608 35647829
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