Tornado Watch 611

Issued

Jul 8, 2011, 1:32 PM MDT (19:32 UTC)

Expired

Jul 8, 2011, 11:00 PM MDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1540Jul 8, 1:13 PM MDT
• Mesoscale Discussion 1545Jul 8, 4:38 PM MDT
• Mesoscale Discussion 1548Jul 8, 9:37 PM MDT

014 
WWUS20 KWNS 081934
SEL1
SPC WW 081934
NDZ000-090300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 611
NWS STORM PREDICTION CENTER NORMAN OK
230 PM CDT FRI JUL 8 2011

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

       WESTERN AND CENTRAL NORTH DAKOTA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 105 STATUTE
MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHWEST OF
MINOT NORTH DAKOTA TO 70 MILES SOUTHEAST OF DICKINSON NORTH
DAKOTA.  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.

OTHER WATCH INFORMATION...CONTINUE...WW 610...

DISCUSSION...THUNDERSTORMS OVER EXTREME ERN MT ARE EXPECTED TO
DEVELOP EWD AND INTENSIFY FURTHER THIS AFTERNOON AS A SHORT WAVE
TROUGH MOVES EWD ACROSS THE AREA.  AIR MASS IS CONTINUING TO WARM
AND DESTABILIZE WITH MLCAPE OF 1500-2000 J/KG EXPECTED THIS
AFTERNOON.  VAD PROFILES EXHIBIT CLOCKWISE TURNING HODOGRAPHS AND
CONSIDERABLE LOWER LEVEL SHEAR/HELICITY SUGGESTING THREAT FOR
SUPERCELLS AND A FEW TORNADOES...LARGE HAIL AND DAMAGING WINDS.  THE
WIND THREAT MAY INCREASE BY EVENING AS THERE IS POTENTIAL FOR STORMS
TO GROW UPSCALE INTO A FORWARD PROPAGATING MCS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24030.


...WEISS

Tornado Watches in North Dakota, 2011Every tornado watch in 2011

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.