Tornado Watch 814

Issued

Sep 8, 2004, 12:50 PM EDT (16:50 UTC)

Expired

Sep 8, 2004, 7:00 PM EDT

In force

6 hr

Issued by

the Storm Prediction Center

The Raleigh/Durham radar (KRAX), 89 km from the middle of the area, began a volume at 16:50 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

• Mesoscale Discussion 2189Sep 8, 12:00 PM EDT
• Mesoscale Discussion 2190Sep 8, 3:39 PM EDT

000 
WWUS20 KWNS 081652
SEL4  
SPC WW 081650
DCZ000-MDZ000-NCZ000-VAZ000-CWZ000-082300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 814
NWS STORM PREDICTION CENTER NORMAN OK
1250 PM EDT WED SEP 8 2004

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       DISTRICT OF COLUMBIA
       SOUTHERN MARYLAND
       CENTRAL AND EASTERN NORTH CAROLINA
       CENTRAL AND EASTERN VIRGINIA
       COASTAL WATERS

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL
700 PM EDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 55 MILES NORTH NORTHEAST OF CHARLOTTESVILLE
VIRGINIA TO 15 MILES SOUTHEAST OF FAYETTEVILLE NORTH CAROLINA.

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...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 813. WATCH NUMBER 813 WILL NOT BE IN EFFECT AFTER
1250 PM EDT. 

DISCUSSION...BREAKS IN CLOUDS WILL CONTINUE TO SPREAD NWD ACROSS
VA...ALLOWING ADDITIONAL DESTABILIZATION THIS AFTERNOON.  BOUNDARY
LAYER DEWPOINTS IN THE MID 70S AND TEMPERATURES IN THE 80S WILL
SUPPORT SBCAPE VALUES OF 1500-2500 J/KG...IN AN ENVIRONMENT OF 0-1
KM SRH OF 200-300 M2/S2.  THE THREAT FOR SUPERCELLS WITH A FEW
TORNADOES WILL LIKELY INCREASE THIS AFTERNOON AS CELLULAR CONVECTION
INCREASES IN THE WARM SECTOR FROM CENTRAL NC TO CENTRAL VA...WITH
THE GREATEST TORNADO THREAT FOCUSED ALONG A WEAK BAROCLINIC ZONE
ACROSS CENTRAL VA.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 18025.


...THOMPSON

385,0763 344,0771 344,0800 385,0793

Tornado Watches in Virginia, 2004Tornado Watches in North Carolina, 2004Tornado Watches in Maryland, 2004Every tornado watch in 2004

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.