Tornado Watch 640

Issued

Jul 13, 2011, 3:41 PM MDT (21:41 UTC)

Expired

Jul 13, 2011, 10:00 PM MDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Goodland radar (KGLD), 30 km from the middle of the area, began a volume at 21:43 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

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1606Jul 13, 2:23 PM MDT
• Mesoscale Discussion 1610Jul 13, 6:46 PM MDT

600 
WWUS20 KWNS 132140
SEL0
SPC WW 132140
COZ000-KSZ000-NEZ000-140400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 640
NWS STORM PREDICTION CENTER NORMAN OK
345 PM MDT WED JUL 13 2011

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

       EASTERN COLORADO
       NORTHWEST KANSAS
       SOUTHWEST NEBRASKA

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 345 PM UNTIL
1000 PM MDT.

TORNADOES...HAIL TO 2 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 45 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST OF LIMON
COLORADO TO 40 MILES SOUTH SOUTHEAST OF KEARNEY NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 638...WW 639...

DISCUSSION...ISOLATED SUPERCELL THUNDERSTORMS HAVE BEGUN TO FORM
ALONG A BOUNDARY EXTENDING FROM EAST-CENTRAL CO INTO SOUTH-CENTRAL
NEB.  BACKED LOW LEVEL WINDS ALONG AND NORTH OF THE
BOUNDARY...COUPLED WITH NEAR 70F DEWPOINTS AND HIGH CAPE VALUES WILL
POSE A RISK OF A FEW TORNADOES THROUGH THE EVENING.
OTHERWISE...LARGE HAIL AND DAMAGING WINDS APPEAR TO BE THE MAIN
THREATS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26025.


...HART

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