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479 

WWUS20 KWNS 181716

SEL2

SPC WW 181716

INZ000-MDZ000-OHZ000-PAZ000-WVZ000-190100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 492

NWS STORM PREDICTION CENTER NORMAN OK

115 PM EDT WED JUL 18 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN AND EASTERN INDIANA

       WESTERN MARYLAND PANHANDLE

       OHIO

       WESTERN PENNSYLVANIA

       NORTHERN WEST VIRGINIA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 115 PM UNTIL

900 PM EDT.



HAIL TO 1.5 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF

MUNCIE INDIANA TO 25 MILES EAST SOUTHEAST OF LATROBE

PENNSYLVANIA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 490...WW 491...



DISCUSSION...SCATTERED-NUMEROUS STORMS ARE ANTICIPATED TO DEVELOP

ALONG AND TO THE S OF SLOW-MOVING COLD FRONT.  THOUGH ENVIRONMENT

WILL REMAIN WEAKLY SHEARED...STEEPENING LOW-LEVEL LAPSE RATES...HIGH

PW CONTENT AND MLCAPE OF 2000-4000 J/KG WILL FOSTER INTENSE WET

MICROBURSTS CAPABLE OF LOCALLY DAMAGING WIND GUSTS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 30015.





...MEAD

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