Severe Thunderstorm Watch 439

Issued

Jun 29, 2012, 10:09 PM EDT (02:09 UTC)

Expired

Jun 30, 2012, 2:00 AM EDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

65 kt

The Dover AFB radar (KDOX), 60 km from the middle of the area, began a volume at 02:13 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.

Two or more tornadoes

20%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

90%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1314Jun 29, 7:51 PM EDT
• Mesoscale Discussion 1316Jun 29, 10:51 PM EDT

127 
WWUS20 KWNS 300211
SEL9
SPC WW 300211
DEZ000-MDZ000-NJZ000-VAZ000-CWZ000-300600-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 439
NWS STORM PREDICTION CENTER NORMAN OK
1010 PM EDT FRI JUN 29 2012

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

       DELAWARE
       EASTERN MARYLAND
       SOUTHERN NEW JERSEY
       EASTERN VIRGINIA
       COASTAL WATERS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1010 PM
UNTIL 200 AM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST
NORTHEAST OF WILMINGTON DELAWARE TO 25 MILES SOUTH OF NORFOLK
VIRGINIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

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 438...

DISCUSSION...A WELL-ORGANIZED LINE OF CONVECTION CONTINUES MOVING
QUICKLY EWD ACROSS VA/MD ATTM...WITH A VERY UNSTABLE DOWNSTREAM
AIRMASS EXTENDING TO THE COAST EXPECTED TO PERMIT THIS MCS TO REMAIN
SEVERE UNTIL MOVING OFFSHORE OVER THE NEXT FEW HOURS.  THIS MCS HAS
A HISTORY OF WIDESPREAD DAMAGING WINDS AND HAIL...AND EXPECT THE
DAMAGING WIND THREAT TO ACCOMPANY THIS SYSTEM AS IT CROSSES THE
REMAINDER OF THE MID-ATLANTIC REGION.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29045.


...GOSS

Severe Thunderstorm Watches in Virginia, 2012Severe Thunderstorm Watches in Maryland, 2012Severe Thunderstorm Watches in New Jersey, 2012Every severe thunderstorm watch in 2012

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.