SEL2 URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 312 NWS STORM PREDICTION CENTER NORMAN OK 1030 AM EDT TUE MAY 29 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN NEW YORK EASTERN OHIO WESTERN AND CENTRAL PENNSYLVANIA NORTHERN WEST VIRGINIA LAKE ERIE LAKE ONTARIO EFFECTIVE THIS TUESDAY MORNING AND EVENING FROM 1030 AM UNTIL 700 PM EDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH NORTHWEST OF SYRACUSE NEW YORK TO 45 MILES EAST SOUTHEAST OF ZANESVILLE OHIO. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2). REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. DISCUSSION...STORMS ARE INCREASING OVER ERN OH IN ADVANCE OF AN UPPER TROUGH MOVING TOWARD THE UPPER GREAT LAKES REGION. 12Z SOUNDINGS AND LATEST SURFACE OBSERVATIONS INDICATE AN MODERATELY/STRONGLY UNSTABLE AIR MASS IS DEVELOPING OVER PA AND NY AS STRONG DIABATIC HEATING COMBINES WITH AMPLE MOISTURE AND MODERATE STEEP LAPSE RATES BELOW 500 MB. MULTIPLE BANDS OF STORMS ARE LIKELY TO DEVELOP TODAY CAPABLE OF PRODUCING STRONG WIND GUSTS AND SEVERE HAIL. ADDITIONAL WATCHES WILL LIKELY BE NEEDED TO THE EAST OF THIS WATCH BY THE EARLY AFTERNOON HOURS. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION VECTOR 24025.
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