Tornado Watch 387

Issued

Jun 12, 2007, 11:17 AM MDT (17:17 UTC)

Expired

Jun 12, 2007, 6:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Goodland radar (KGLD), 90 km from the middle of the area, began a volume at 17:19 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 1110Jun 12, 10:10 AM MDT
• Mesoscale Discussion 1115Jun 12, 1:47 PM MDT
• Mesoscale Discussion 1122Jun 12, 4:35 PM MDT

000
WWUS20 KWNS 121717
SEL7  
SPC WW 121717
COZ000-KSZ000-NEZ000-130000-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 387
NWS STORM PREDICTION CENTER NORMAN OK
1220 PM CDT TUE JUN 12 2007

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

       PARTS OF NORTHEAST COLORADO
       PARTS OF NORTHWEST KANSAS
       MUCH OF WESTERN NEBRASKA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1220 PM UNTIL
700 PM CDT.

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 70 STATUTE
MILES EAST AND WEST OF A LINE FROM 70 MILES SOUTH OF GOODLAND
KANSAS TO 10 MILES WEST NORTHWEST OF VALENTINE 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 384...WW 385...WW 386...

DISCUSSION...WITH A VERY MOIST/UNSTABLE AIRMASS IN PLACE AND THE
APPROACH OF THE UPPER TROUGH FROM THE SRN ROCKIES...STORMS ARE
INCREASING RAPIDLY IN WRN PORTION OF THE WATCH.  LOW LEVEL SHEAR/LOW
LCL AND STRONG INSTABILITY SUPPORT POTENTIAL FOR TORNADIC
SUPERCELLS.  INITIAL SUPERCELLS DEVELOPING NERN CO W OF GLD AND WILL
TRACK INTO SWRN NEB WITH ADDITIONAL SUPERCELL POTENTIAL DURING
AFTERNOON ACROSS WATCH.

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
550. MEAN STORM MOTION VECTOR 20030.


...HALES

Tornado Watches in Nebraska, 2007Tornado Watches in Kansas, 2007Tornado Watches in Colorado, 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.