Tornado Watch 338

Issued

Jun 1, 2012, 8:01 PM EDT (00:01 UTC)

Expired

Jun 2, 2012, 12:18 AM EDT

In force

4 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Sterling radar (KLWX), 113 km from the middle of the area, began a volume at 00:02 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

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1010Jun 1, 4:25 PM EDT
• Mesoscale Discussion 1011Jun 1, 4:31 PM EDT
• Mesoscale Discussion 1014Jun 1, 6:54 PM EDT
• Mesoscale Discussion 1016Jun 1, 7:42 PM EDT

260 
WWUS20 KWNS 020005
SEL8
SPC WW 020005
DCZ000-DEZ000-MDZ000-NCZ000-NJZ000-PAZ000-VAZ000-CWZ000-020600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 338
NWS STORM PREDICTION CENTER NORMAN OK
800 PM EDT FRI JUN 1 2012

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

       DISTRICT OF COLUMBIA
       DELAWARE
       CENTRAL AND EASTERN MARYLAND
       FAR NORTHEAST NORTH CAROLINA
       SOUTHWESTERN NEW JERSEY
       SOUTHEAST AND EAST CENTRAL PENNSYLVANIA
       CENTRAL AND EASTERN VIRGINIA
       COASTAL WATERS

EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 800 PM
UNTIL 200 AM 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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST SOUTHEAST OF
ROANOKE RAPIDS NORTH CAROLINA TO 45 MILES NORTHEAST OF HARRISBURG
PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 333. WATCH NUMBER 333 WILL NOT BE IN EFFECT AFTER
800 PM EDT. CONTINUE...WW 332...WW 334...WW 335...WW 336...WW
337...

DISCUSSION...THREAT FOR ISOLD TORNADOES AND DMGG WIND EXPECTED TO
PERSIST THROUGH MID-LATE EVE ACROSS WW AREA.  IT APPEARS THAT THIS
THREAT WILL REMAIN BIMODAL...WITH /1/ EPISODIC STRENGTHENING OF LOW
LVL MESOCYCLONES ASSOCIATED WITH SEMI-DISCRETE/BROKEN LINE
SEGMENTS/SHALLOW SUPERCELLS NOW OVER THE CHESAPEAKE BAY REGION...AND
/2/ EMBEDDED CIRCULATIONS ALONG FRONTAL/PRE-FRONTAL SQLN NOW
ENTERING WRN PORTIONS OF THE PA/MD/VA PIEDMONT.  CONTINUED LOW LVL
MOISTURE RETURN...AND STRENGTHENING OF LOW TO MID LVL WIND FIELD
ASSOCIATED WITH THE AMPLIFICATION/EWD ADVANCE OF UPSTREAM SHORTWAVE
TROUGH...EXPECTED TO SOMEWHAT OFFSET NOCTURNAL STABILIZATION TO
MAINTAIN A RISK FOR SVR WEATHER INTO THE NIGHT.

AVIATION...TORNADOES AND 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 450.
MEAN STORM MOTION VECTOR 21040.


...CORFIDI

Tornado Watches in Virginia, 2012Tornado Watches in Maryland, 2012Tornado Watches in Pennsylvania, 2012Every tornado 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.