Severe Thunderstorm Watch 641

Issued

Aug 26, 2002, 5:10 PM MDT (23:10 UTC)

Expired

Aug 26, 2002, 10:00 PM MDT

In force

5 hr

Issued by

the Storm Prediction Center

Counties Arthur County, NE, Banner County, NE, Box Butte County, NE, Cherry County, NE, Cheyenne County, NE, Dawes County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Hooker County, NE, Keith County, NE, Kimball County, NE, McPherson County, NE, Morrill County, NE, Scotts Bluff County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Fall River County, SD

The North Platte radar (KLNX), 184 km from the middle of the area, began a volume at 23:12 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 262312
SEL1  
SPC WW 262310
NEZ000-SDZ000-270400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 641
STORM PREDICTION CENTER NORMAN OK
510 PM MDT MON AUG 26 2002

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

WESTERN NEBRASKA                           
EXTREME SOUTHWEST SOUTH DAKOTA                       

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 510 PM UNTIL 1000
PM MDT.

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 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 25 MILES EAST SOUTHEAST OF SIDNEY
NEBRASKA TO 45 MILES NORTHEAST OF CHADRON NEBRASKA.

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 637.  WATCH NUMBER 637 WILL NOT BE
IN EFFECT AFTER 510 PM MDT.  CONTINUE...WW 638...WW 639...WW 640...

DISCUSSION...SEVERE STORMS WILL DEVELOP SWD ACROSS THE NEB
PANHANDLE ALONG AN AXIS OF STRONG SURFACE-BASED INSTABILITY IN THE
VICINITY OF SEVERAL N-S ORIENTED OUTFLOW BOUNDARIES.  DEEP LAYER
SHEAR WILL REMAIN FAVORABLE FOR SUPERCELLS...ESPECIALLY ALONG THE
WRN FLANK OF THE CONVECTIVE CLUSTERS WHERE STORMS SHOULD REMAIN
MORE DISCRETE.  LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE FOR
THE NEXT SEVERAL HOURS.


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 550.  MEAN STORM
MOTION VECTOR 36020.


...THOMPSON

431,1005 405,1010 405,1035 431,1035

Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in South Dakota, 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.