THE FA IS CURRENTLY UNDER A TORNADO WATCH, EFFECTIVE THROUGH 02Z TONIGHT.  STORM PREDICTION CENTER ISSUED THIS AT 21:45Z.

UPPER LEVEL DYNAMICS ARE FAVORABLE TO CONTINUE SVR WX IN THE WSTRN PA, EST OH AREA.  500MB TROUGH PUTS ACTIVE REGION OF UPR LVL LOW OVER THE FA ALLOWING FOR DIVERGENCE ALOFT TO OCCUR.  90KT JET STREAK IS CURRENTLY TO THE SW OF FA BUT PROGS TO SET THE LEFT EXIT REGION OVER THE FA.  850 LLJ OF 30+ KNOTS WILL PROVIDE VERTICAL SPEED SHEAR ALLOWING FOR SOME ROTATING STORMS TO BE POSSIBLE.  SURFACE DEWPOINTS IN THE 50'S WILL FEED MOISTURE INTO THESE THUNDERSTORMS, HOWEVER IN EASTERN WASH CO., PA, DEWPOINTS ARE ONLY IN THE LOWER 50'S.  MUCAPE VALUES ARE BETWEEN 600 AND 700 J/KG THROUGHOUT SWPA.  HELICITY VALUES VARY THROUGHT THE FA, HOWEVER ARE HIGHER IN EASTERN OH, WEST OF THE WV BOARDER.  LI VALUES OF -4 PROVE THAT SUPERCELL FORMATION IS POSSIBLE.  PW READINGS ARE LOWER THAN SVR WX THRESHOLD IN MAJORITY OF FA, BUT SOUTHERLY WINDS AT ALL LVLS WILL SERVE TO ADV MOISTURE INTO THE FA AS SECOND LINE OF TRW MOVES INTO FA LATER THIS EVENING. ALONG WITH THIS MOISTURE ADV, DEEP LAYER CONV IS HIGH IN THE FA MEANING THAT STRONG UPLIFT AND SVR WX MAY BE POSSIBLE IF STEEP LAPSE RATES REMIAN AFTER DUSK.

IF CONDITIONS W OF FA ARE ABLE TO SURVIVE THE LOSS OF SOLAR RAD. THE FA DOES RUN THE RISK FOR SVR WX THIS EVENING.   SVR WX DEVELOPMENT MAY ALSO BE HINDERED BY EVAPORATIVE COOLING DUE TO SHOWER ACTIVITY IN SWERN PA. WRF MODEL PROGS THE FA GETTING HIT PRETTY HEAVILY WITH RAIN, HOWEVER SEVERE THREAT SEEMS TO BE IN NE OHIO, NW PA, AND AREAS WEST OF WASH PA.  MAIN THREAT FOR THESE STORMS WILL BE HAIL, POSSIBLY UP TO ONE INCH IN DIAMETER, STRONG WINDS, AND POSSIBLE FLASH FLOODING.