Tornado Watch 754

Issued

Aug 9, 2011, 1:51 PM MDT (19:51 UTC)

Expired

Aug 9, 2011, 8:56 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

60 kt

The Cheyenne radar (KCYS), 150 km from the middle of the area, began a volume at 19:52 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

60%

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

50%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1916Aug 9, 12:47 PM MDT
• Mesoscale Discussion 1921Aug 9, 5:02 PM MDT
• Mesoscale Discussion 1925Aug 9, 8:26 PM MDT

992 
WWUS20 KWNS 091951
SEL4
SPC WW 091951
COZ000-KSZ000-NEZ000-WYZ000-100300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 754
NWS STORM PREDICTION CENTER NORMAN OK
155 PM MDT TUE AUG 9 2011

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

       NORTHEAST COLORADO
       NORTHWEST KANSAS
       SOUTHWEST NEBRASKA
       SOUTHEAST WYOMING

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 155 PM UNTIL
900 PM MDT.

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 65 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 15 MILES WEST NORTHWEST OF
CHEYENNE WYOMING TO 35 MILES EAST OF MCCOOK NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU4).

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 753...

DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS WILL AFFECT THE WATCH
AREA THROUGH THE AFTERNOON AND EARLY EVENING.  PRIMARY RISK OF
ISOLATED TORNADOES WILL BE NEAR A WEAK BOUNDARY ACROSS THE SOUTHERN
NEB PANHANDLE...WITH HAIL AND WIND THREATS GREATEST ACROSS REMAINDER
OF WATCH.  STORMS MAY EVENTUALLY GROW UPSCALE AND TRACK INTO
NORTHWEST KS.

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 30030.


...HART

Tornado Watches in Nebraska, 2011Tornado Watches in Kansas, 2011Tornado Watches in Colorado, 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.