Severe Thunderstorm Watch - Example of A Severe Thunderstorm Watch

Example of A Severe Thunderstorm Watch

The following severe thunderstorm watch was issued for a large portion of the path of the June 2012 North American derecho.

URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 436 NWS STORM PREDICTION CENTER NORMAN OK 305 PM EDT FRI JUN 29 2012 THE NWS STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EXTREME SOUTHEAST INDIANA EXTREME NORTHERN KENTUCKY MOST OF CENTRAL AND SOUTHERN OHIO CENTRAL AND NORTHWEST WEST VIRGINIA EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 305 PM UNTIL 1000 PM EDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST NORTHWEST OF DAYTON OHIO TO 45 MILES EAST OF PARKERSBURG WEST VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6). 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. OTHER WATCH INFORMATION...CONTINUE...WW 435... DISCUSSION...A DEVELOPING MCS/BOW ECHO ACROSS INDIANA IS EXPECTED TO MOVE ESEWD THROUGH THE AFTERNOON/EVENING AT ROUGHLY 50 KT. THE STORM ENVIRONMENT DOWNSTREAM FEATURES STRONG INSTABILITY AND SUFFICIENT DEEP-LAYER FLOW/SHEAR TO MAINTAIN AN ORGANIZED MCS...AND THERE WILL BE THE POTENTIAL FOR WIDESPREAD DAMAGING WINDS /SOME SIGNIFICANT/ WITH THIS BOWING SYSTEM THROUGH THIS EVENING. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 650. MEAN STORM MOTION VECTOR 29050. ...THOMPSON

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