Severe Thunderstorm Watch 397

Issued

Jun 7, 2002, 4:30 PM MDT (22:30 UTC)

Expired

Jun 7, 2002, 10:00 PM MDT

In force

6 hr

Issued by

the Storm Prediction Center

The North Platte radar (KLNX), 1 km from the middle of the area, began a volume at 22:30 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.

000 
WWUS20 KWNS 072209
SEL7  
SPC WW 072203
COZ000-NEZ000-SDZ000-080400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 397
STORM PREDICTION CENTER NORMAN OK
503 PM CDT FRI JUN 7 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   EXTREME NORTHEAST COLORADO                           
   WESTERN AND NORTHERN NEBRASKA                           
   SOUTHEAST SOUTH DAKOTA                       

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 530 PM UNTIL 1100
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 20 MILES WEST SOUTHWEST OF SIDNEY
NEBRASKA TO 45 MILES SOUTH SOUTHEAST OF SIOUX FALLS SOUTH DAKOTA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 396...

DISCUSSION...THUNDERSTORMS ARE INCREASING ALONG AND NORTH OF THE
SURFACE FRONT FROM NERN CO ACROSS CENTRAL NEB.  AIR MASS IS
MODERATELY UNSTABLE NORTH OF THE FRONT WITH MLCAPE OF 1500-2500
J/KG.  STORM MAINTENANCE WILL BE AIDED BY STRENGTHENING LOW LEVEL
JET THIS EVENING.  VERTICAL SHEAR IS FAVORABLE FOR SUPERCELL
DEVELOPMENT AS WINDS EXHIBIT STRONG VEERING WITH HEIGHT...RESULTING
IN 15-20 M/S DEEP LAYER SHEAR.  PRIMARY THREAT SHOULD BE LARGE HAIL
AND DAMAGING WIND GUSTS GIVEN HIGH THUNDERSTORM BASES.


AVIATION...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 24025.


...WEISS

415,1031 435,0962 420,0962 400,1031

Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in South Dakota, 2002Severe Thunderstorm Watches in Colorado, 2002Every severe thunderstorm watch in 2002

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.