Tornado Watch 767

Issued

Aug 11, 2011, 4:38 PM CDT (21:38 UTC)

Expired

Aug 12, 2011, 2:00 AM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

60 kt

Counties Blaine County, NE, Boyd County, NE, Brown County, NE, Cherry County, NE, Custer County, NE, Garfield County, NE, Grant County, NE, Holt County, NE, Hooker County, NE, Keya Paha County, NE, Loup County, NE, Rock County, NE, Sheridan County, NE, Thomas County, NE, Wheeler County, NE

The North Platte radar (KLNX), 78 km from the middle of the area, began a volume at 21:41 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

50%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1945Aug 11, 4:15 PM CDT
• Mesoscale Discussion 1948Aug 11, 6:38 PM CDT
• Mesoscale Discussion 1949Aug 11, 9:22 PM CDT
• Mesoscale Discussion 1952Aug 12, 1:45 AM CDT

344 
WWUS20 KWNS 112135
SEL7  
SPC WW 112135
NEZ000-120500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 767
NWS STORM PREDICTION CENTER NORMAN OK
435 PM CDT THU AUG 11 2011

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

       NORTHERN NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON FROM 435 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 80 MILES WEST NORTHWEST OF
MULLEN NEBRASKA TO 20 MILES EAST NORTHEAST OF ONEILL NEBRASKA. 
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 766...

DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS ARE TRACKING
SOUTHEASTWARD ACROSS SD...AND WILL BEGIN AFFECTING PORTIONS OF THE
WATCH AREA IN THE NEXT 1-2 HOURS.  MEANWHILE...INCREASING CU FIELD
MAY ALSO RESULT IN AN ISOLATED STORM OR TWO TO FORM OVER NORTHERN
NEB THIS EVENING.  STRONG VERTICAL SHEAR AND AMPLE CAPE WILL SUPPORT
A RISK OF SUPERCELLS CAPABLE OF VERY LARGE HAIL AND DAMAGING WINDS. 
STRENGTHENING LOW LEVEL WIND FIELDS DURING THE EVENING ALSO INDICATE
A RISK OF ISOLATED TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 30025.


...HART

Tornado Watches in Nebraska, 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; radar from the NEXRAD Level II archive.