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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 131

NWS STORM PREDICTION CENTER NORMAN OK

230 PM EDT FRI APR 19 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  DISTRICT OF COLUMBIA

  CENTRAL AND EASTERN MARYLAND

  NORTH-CENTRAL NORTH CAROLINA

  CENTRAL AND EASTERN VIRGINIA

  EASTERN WEST VIRGINIA PANHANDLE

  COASTAL WATERS



* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

  1000 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  A FEW LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 15 MILES EAST OF DANVILLE

VIRGINIA TO 40 MILES NORTH NORTHWEST OF BALTIMORE MARYLAND.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 129...WW 130...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY EAST OF THE HIGH TERRAIN THIS AFTERNOON AS REGION IS

INFLUENCED BY A MIDLEVEL JET STREAK LIFTING POLEWARD THROUGH THE TN

VALLEY.  WHILE MIDLEVEL LAPSE RATES ARE POOR...DAYTIME HEATING

COUPLED WITH BOUNDARY LAYER DEWPOINTS IN THE LOW TO MID 60S WILL

YIELD MLCAPE VALUES OF 500-1000 J/KG.  THIS INSTABILITY WILL ALIGN

WITH A STRONGLY SHEARED KINEMATIC ENVIRONMENT WHICH WILL PROMOTE

ORGANIZED STORM MODES...INCLUDING SUPERCELL AND LEWP STRUCTURES

CAPABLE OF DAMAGING WINDS AND A FEW TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.

MEAN STORM MOTION VECTOR 24040.





...MEAD

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