Severe Thunderstorm Watch 710

Issued

Aug 11, 2006, 1:46 PM MDT (19:46 UTC)

Expired

Aug 11, 2006, 10:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Bismarck radar (KBIS), 130 km from the middle of the area, began a volume at 19:45 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

60%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

80%

One or more hailstones of 2 inches or more

50%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1797Aug 11, 1:18 PM MDT
• Mesoscale Discussion 1799Aug 11, 4:20 PM MDT
• Mesoscale Discussion 1800Aug 11, 6:58 PM MDT

000 
WWUS20 KWNS 111947
SEL0  
SPC WW 111947
NDZ000-NEZ000-SDZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 710
NWS STORM PREDICTION CENTER NORMAN OK
250 PM CDT FRI AUG 11 2006

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

       WESTERN NORTH DAKOTA
       NORTHWEST NEBRASKA
       WESTERN SOUTH DAKOTA

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
1100 PM CDT.

HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
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 70 MILES NORTHWEST OF
MINOT NORTH DAKOTA TO 60 MILES SOUTHWEST OF VALENTINE NEBRASKA. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 709...

DISCUSSION...THUNDERSTORMS EXPECTED TO DEVELOP RAPIDLY VICINITY WRN
BORDERS OF ND/SD WHERE AIR MASS HAS BECOME VERY UNSTABLE AND WEAKLY
CAPPED.  SHEAR PROFILES ARE FAVORABLE FOR SUPERCELLS GIVEN APPROACH
OF MID LEVEL TROUGH AND MLCAPES AOA 2000 J/KG. PRIMARY THREAT WILL
BE VERY LARGE HAIL AND DAMAGING DOWNBURSTS WINDS.  STORMS WILL
PROPAGATE E/NEWD ACROSS WRN DAKOTAS DURING THRU THE EVENING.

AVIATION...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 550. MEAN STORM
MOTION VECTOR 24030.


...HALES

Severe Thunderstorm Watches in North Dakota, 2006Severe Thunderstorm Watches in South Dakota, 2006Severe Thunderstorm Watches in Nebraska, 2006Every severe thunderstorm watch in 2006

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.