Tornado Watch 312

Issued

May 31, 2007, 12:01 PM MDT (18:01 UTC)

Expired

May 31, 2007, 9:00 PM MDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Goodland radar (KGLD), 48 km from the middle of the area, began a volume at 18:00 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

30%

Ten or more severe wind reports

40%

One or more gusts of 65 knots or more

40%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 933May 31, 11:33 AM MDT
• Mesoscale Discussion 937May 31, 2:28 PM MDT
• Mesoscale Discussion 939May 31, 5:38 PM MDT

000
WWUS20 KWNS 311805
SEL2  
SPC WW 311805
COZ000-KSZ000-NEZ000-010100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 312
NWS STORM PREDICTION CENTER NORMAN OK
1205 PM MDT THU MAY 31 2007

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

       EASTERN COLORADO
       WESTERN KANSAS
       SOUTHWEST NEBRASKA

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 1205 PM UNTIL
700 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 135 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTHEAST OF IMPERIAL
NEBRASKA TO 75 MILES SOUTH SOUTHEAST OF BURLINGTON COLORADO.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU2).

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.

DISCUSSION...STRONG/SEVERE STORMS CONTINUE IN ALLEY OF FAVORABLE
MOISTURE CONVERGENCE AS A MID/UPPER LEVEL SHORTWAVE TROUGH BEGINS TO
MOVE SEWD FROM SERN WY.  AIR MASS CONTINUES TO DESTABILIZE AS MUCAPE
VALUES ARE BETWEEN 100-2000 J/KG.  DEEP LAYER IS ALSO ON THE
INCREASE AT 50-60 KT FROM CENTRAL CO INTO W CENTRAL KS JUST AHEAD OF
MID LEVEL JET EXIT REGION.  EXPECT MORE STORM DEVELOPMENT NEXT
SEVERAL HOURS ACROSS THIS AREA AHEAD OF SHORTWAVE TROUGH/MID LEVEL
JET EXIT REGION AS AIR MASS CONTINUES TO DESTABILIZE AND LOW LEVEL
JET BECOMES MORE DEFINED BETWEEN NOW AND 00Z.

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
450. MEAN STORM MOTION VECTOR 27030.


...MCCARTHY

Tornado Watches in Kansas, 2007Tornado Watches in Colorado, 2007Tornado Watches in Nebraska, 2007Every tornado watch in 2007

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.