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295 

WWUS20 KWNS 201710

SEL5

SPC WW 201710

DCZ000-INZ000-KYZ000-MDZ000-OHZ000-VAZ000-WVZ000-CWZ000-210100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 425

NWS STORM PREDICTION CENTER NORMAN OK

110 PM EDT SAT JUL 20 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  DISTRICT OF COLUMBIA

  SOUTHEASTERN INDIANA

  NORTHEASTERN KENTUCKY

  CENTRAL AND WESTERN MARYLAND INCLUDING PANHANDLE

  SOUTHERN OHIO

  NORTHERN VIRGINIA

  CENTRAL AND NORTHERN WEST VIRGINIA INCLUDING EASTERN PANHANDLE

  COASTAL WATERS



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 110 PM UNTIL

  900 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 55

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 95 MILES WEST OF

ATHENS OHIO TO 15 MILES SOUTH SOUTHEAST OF BALTIMORE MARYLAND.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU5).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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...INITIALLY LOOSELY ORGANIZED BELT OF TSTMS FROM NRN WV

ACROSS SRN OH...AS WELL AS SEPARATE AREA OF CONVECTION OVER CENTRAL

INDIANA...MAY ORGANIZE AND INTENSIFY TO SVR LEVELS AS THEY MOVE

ESEWD INTO DIABATICALLY DESTABILIZING AND FAVORABLY MOIST AIR

MASS...NEAR SRN EDGE OF FAVORABLE MID-UPPER LEVEL FLOW.

MULTICELLULAR BANDS AND CLUSTERS WILL OFFER DAMAGING GUSTS AND

SPORADIC LARGE HAIL BEFORE WEAKENING EARLY THIS EVENING.



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 550. MEAN STORM

MOTION VECTOR 28025.





...EDWARDS

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