

779 

WWUS20 KWNS 061810

SEL8

SPC WW 061810

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-WVZ000-CWZ000-070100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 498

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT SAT SEP 6 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  DISTRICT OF COLUMBIA

  DELAWARE

  CENTRAL AND EASTERN MARYLAND

  NEW JERSEY

  SOUTHERN AND EASTERN PENNSYLVANIA

  NORTHERN VIRGINIA

  THE EASTERN PANHANDLE OF WEST VIRGINIA

  COASTAL WATERS



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

  900 PM EDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTH OF NEWARK

NEW JERSEY TO 15 MILES SOUTH SOUTHWEST OF WASHINGTON DISTRICT OF

COLUM.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 497...



DISCUSSION...SCTD TO NUMEROUS TSTMS EXPECTED ACROSS WW AREA THROUGH

EARLY EVE...WITH STORMS GRADUALLY MERGING INTO E TO ESE-MOVING

CLUSTERS. WHILE WLY DEEP SHEAR DECREASES WITH N-TO-S EXTENT IN

WW...AMPLE SHEAR APPEARS PRESENT FOR SOME DEGREE OF STORM

ORGANIZATION/SUSTENANCE...ESPECIALLY IN PA/NJ. GIVEN DEGREE OF

BUOYANCY /MUCAPE UP TO 3000 J PER KG/ AND HIGH PW...SETUP MAY YIELD

SCTD INSTANCES OF LOCALLY DMGG WIND AND PERHAPS MARGINALLY SVR HAIL

THROUGH EARLY TNGT.



AVIATION...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 550. MEAN STORM MOTION

VECTOR 27025.





...CORFIDI



464 

WWUS20 KWNS 061810

SEL8

SPC WW 061810

DCZ000-DEZ000-MDZ000-NJZ000-PAZ000-VAZ000-WVZ000-CWZ000-070100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 498

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT SAT SEP 6 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  DISTRICT OF COLUMBIA

  DELAWARE

  CENTRAL AND EASTERN MARYLAND

  NEW JERSEY

  SOUTHERN AND EASTERN PENNSYLVANIA

  NORTHERN VIRGINIA

  THE EASTERN PANHANDLE OF WEST VIRGINIA

  COASTAL WATERS



* EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

  900 PM EDT.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

  ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTH OF NEWARK

NEW JERSEY TO 15 MILES SOUTH SOUTHWEST OF WASHINGTON DISTRICT OF

COLUM.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 497...



DISCUSSION...SCTD TO NUMEROUS TSTMS EXPECTED ACROSS WW AREA THROUGH

EARLY EVE...WITH STORMS GRADUALLY MERGING INTO E TO ESE-MOVING

CLUSTERS. WHILE WLY DEEP SHEAR DECREASES WITH N-TO-S EXTENT IN

WW...AMPLE SHEAR APPEARS PRESENT FOR SOME DEGREE OF STORM

ORGANIZATION/SUSTENANCE...ESPECIALLY IN PA/NJ. GIVEN DEGREE OF

BUOYANCY /MUCAPE UP TO 3000 J PER KG/ AND HIGH PW...SETUP MAY YIELD

SCTD INSTANCES OF LOCALLY DMGG WIND AND PERHAPS MARGINALLY SVR HAIL

THROUGH EARLY TNGT.



AVIATION...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 550. MEAN STORM MOTION

VECTOR 27025.





...CORFIDI

