

233 

WWUS20 KWNS 131621

SEL6

SPC WW 131621

DCZ000-MDZ000-TNZ000-VAZ000-WVZ000-CWZ000-132300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 306

NWS STORM PREDICTION CENTER NORMAN OK

1220 PM EDT THU JUN 13 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  DISTRICT OF COLUMBIA

  WESTERN MARYLAND

  EASTERN TENNESSEE

  WESTERN VIRGINIA

  EASTERN WEST VIRGINIA

  COASTAL WATERS



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1220 PM

  UNTIL 700 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2

    INCHES IN DIAMETER POSSIBLE

  A FEW DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW TORNADOES POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 100

STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTHWEST OF

WASHINGTON DISTRICT OF COLUM TO 30 MILES EAST SOUTHEAST OF

BRISTOL TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 305...



DISCUSSION...ORGANIZED LINE OF CONVECTION WILL CONTINUE TO TRACK

GENERALLY EAST ACROSS THE APPALACHIANS THROUGH THE AFTERNOON

SUSTAINED BY MODEST LARGE SCALE SUPPORT AND INCREASING

INSTABILITY...ESPECIALLY EAST OF THE MOUNTAINS AND SOUTH OF AN

OUTFLOW BOUNDARY ACROSS SCNTRL VA. PRIMARILY UNIDIRECTIONAL SHEAR

PROFILES WILL LIKELY MAINTAIN LINEAR STRUCTURE TO THE LINE WITH

BOWING/ACCELERATING SEGMENTS CAPABLE OF PRODUCING SEVERE WIND GUSTS

AND DAMAGE. SOME LOCALIZED TORNADO THREAT MAY EVOLVE WERE CONVECTION

INTERACTS WITH THE RESIDUAL BOUNDARY ACROSS VA...OR MORE ORGANIZED

SMALL SCALE BOWING SEGMENTS DEVELOP MESOVORTICES/BOW-HEAD

CIRCULATIONS.



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 450. MEAN STORM

MOTION VECTOR 25040.





...CARBIN

