Tornado Watch 641

Issued

Sep 18, 2012, 9:45 AM EDT (13:45 UTC)

Expired

Sep 18, 2012, 5:56 PM EDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

The Raleigh/Durham radar (KRAX), 32 km from the middle of the area, began a volume at 13:47 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

30%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1957Sep 18, 8:49 AM EDT
• Mesoscale Discussion 1960Sep 18, 11:19 AM EDT
• Mesoscale Discussion 1963Sep 18, 1:21 PM EDT
• Mesoscale Discussion 1969Sep 18, 4:11 PM EDT

355 
WWUS20 KWNS 181344
SEL1
SPC WW 181344
NCZ000-182100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 641
NWS STORM PREDICTION CENTER NORMAN OK
945 AM EDT TUE SEP 18 2012

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

       CENTRAL NORTH CAROLINA

EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 945 AM UNTIL
500 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 APPROXIMATELY ALONG AND 50 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES WEST NORTHWEST OF
ROANOKE RAPIDS NORTH CAROLINA TO 10 MILES SOUTH SOUTHWEST OF
FAYETTEVILLE NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE
WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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.

DISCUSSION...BROKEN BAND OF SHOWERS HAS ALREADY SHOWN SIGNS OF
ROTATION AS IT INTERACTS WITH A VERY MOIST AND STRONGLY SHEARED
ENVIRONMENT.  EXPECT ONGOING ACTIVITY TO FURTHER DEEPEN INTO
SUPERCELLS AND/OR A BOWING LINE SEGMENT CAPABLE OF TORNADOES AND
DAMAGING WINDS.

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
400. MEAN STORM MOTION VECTOR 22035.


...MEAD

Tornado Watches in North Carolina, 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.