Tornado Watch 417

Issued

Jun 1, 2008, 2:29 PM MDT (20:29 UTC)

Expired

Jun 1, 2008, 10:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Rapid City radar (KUDX), 187 km from the middle of the area, began a volume at 20:31 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

90%

• Mesoscale Discussion 1141Jun 1, 2:02 PM MDT
• Mesoscale Discussion 1144Jun 1, 4:42 PM MDT
• Mesoscale Discussion 1148Jun 1, 6:45 PM MDT
• Mesoscale Discussion 1149Jun 1, 8:46 PM MDT

000
WWUS20 KWNS 012028
SEL7  
SPC WW 012028
NEZ000-SDZ000-WYZ000-020400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 417
NWS STORM PREDICTION CENTER NORMAN OK
230 PM MDT SUN JUN 1 2008

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

       NEBRASKA PANHANDLE
       FAR SOUTHWEST SOUTH DAKOTA
       EASTERN WYOMING

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 230 PM UNTIL
1000 PM MDT.

TORNADOES...HAIL TO 2.5 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 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 95 MILES NORTH NORTHEAST OF
DOUGLAS WYOMING TO 5 MILES SOUTH SOUTHEAST OF SIDNEY 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 415...WW 416...

DISCUSSION...SEVERE THUNDERSTORMS...INCLUDING POTENTIAL FOR
LONGER-LIVED SUPERCELLS...WILL DEVELOP AND SPREAD ESEWD ACROSS WW
THIS EVENING.  AIR MASS IS ALREADY MODERATELY UNSTABLE WITH
EFFECTIVE SHEAR NEAR 50 KT.  STORMS WILL BE CAPABLE OF LARGE
HAIL...WITH ISOLATED TORNADO THREAT INCREASING THROUGH THE EARLY
EVENING AS SELY LOW LEVEL FLOW STRENGTHENS OVER SERN WY/NEB
PANHANDLE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 28020.


...EVANS

Tornado Watches in Nebraska, 2008Tornado Watches in Wyoming, 2008Tornado Watches in South Dakota, 2008Every tornado watch in 2008

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.