

861 

WWUS20 KWNS 271804

SEL7

SPC WW 271804

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-CWZ000-280200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 377

NWS STORM PREDICTION CENTER NORMAN OK

200 PM EDT THU JUN 27 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  DISTRICT OF COLUMBIA

  DELAWARE

  CENTRAL AND EASTERN MARYLAND

  NEW JERSEY

  SOUTH CENTRAL AND SOUTHEASTERN PENNSYLVANIA

  NORTHERN VIRGINIA

  COASTAL WATERS



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 200 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 1.5 INCHES IN DIAMETER POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHWEST OF

ALLENTOWN PENNSYLVANIA TO 50 MILES SOUTH OF DOVER DELAWARE.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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 376...



DISCUSSION...STRONG/SEVERE STORM DEVELOPMENT IS NOW UNDERWAY ALONG

AND TO THE EAST OF THE NORTH CENTRAL APPALACHIANS.  ACTIVITY IS

EXPECTED TO CONTINUE TO INCREASE AND INTENSIFY...AHEAD OF THE

MID-LEVEL TROUGH SHIFTING TOWARD NORTHERN MID ATLANTIC COASTAL

AREAS.  DEEP LAYER FLOW AND SHEAR ARE SOMEWHAT MODEST...BUT HIGH

BOUNDARY LAYER MOISTURE CONTENT AND HUMIDITY...COUPLED WITH AMBIENT

VERTICAL VORTICITY...MAY CONTRIBUTE TO THE RISK FOR A FEW...AT LEAST

WEAK...TORNADOES IN DISCRETE STORMS.  PRECIPITATION LOADING WITHIN

CONSOLIDATING CONVECTION WILL ALSO CONTRIBUTE TO THE RISK FOR

POTENTIALLY DAMAGING WIND GUSTS.



AVIATION...TORNADOES AND 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 24025.





...KERR

