As we discussed earlier conditions have become unstable across the Eastern U.S. and two tornado watches have now been issued. The most recent is near Nelson, but does not include us at this time. I would not be surprised to see the watch area expanded later this evening. Dewpoints are running in the low 70’s so the air is very moist at this time. Again, Nelson is not included in this watch, but is very close to the watch area.
URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 483…CORRECTED
NWS STORM PREDICTION CENTER NORMAN OK
205 PM EDT WED JUL 4 2007
CORRECTED TO “MUCH OF MARYLAND” INSTEAD OF “MARYLAND”
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
DISTRICT OF COLUMBIA
MUCH OF DELAWARE
MUCH OF MARYLAND
MUCH OF NEW JERSEY
SOUTHERN AND EASTERN PENNSYLVANIA
NORTHERN AND CENTRAL VIRGINIA
EASTERN WEST VIRGINIA
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 205 PM UNTIL
1000 PM EDT.
TORNADOES…HAIL TO 1 INCH IN DIAMETER…THUNDERSTORM WIND GUSTS
TO 70 MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 5 MILES SOUTH SOUTHEAST OF
TRENTON NEW JERSEY TO 80 MILES WEST SOUTHWEST OF MARTINSBURG WEST
VIRGINIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 482…
DISCUSSION…TSTMS/POSSIBLE SUPERCELLS EXPECTED TO INCREASE OVER WW
THIS AFTERNOON THROUGH THE EVENING AS HEATING CONTINUES IN
MODERATELY SHEARED /40 KT/ ENVIRONMENT INVOF NW FLOW SHORT WAVE
TROUGH. WHILE INSTABILITY WILL REMAIN FAIRLY LIMITED…SUBSTANTIAL
DIRECTIONAL COMPONENT TO DEEP SHEAR WILL FAVOR A SEMI-DISCRETE MODE
WITH STORMS THAT DO FORM. DECREASING LCLS AND STRENGTHENING LLJ
INVOF WARM FRONT OVER ERN PA MAY ENHANCE POTENTIAL FOR LOW LVL STORM
ROTATION INTO EARLY EVENING EWD INTO NJ.