Tornado Watch 480

Issued

Jun 7, 2008, 4:25 PM CDT (21:25 UTC)

Expired

Jun 7, 2008, 11:14 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

70 kt

The Omaha radar (KOAX), 35 km from the middle of the area, began a volume at 21:28 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

70%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

80%

One or more gusts of 65 knots or more

60%

Ten or more severe hail reports

90%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1266Jun 7, 3:29 PM CDT
• Mesoscale Discussion 1268Jun 7, 6:34 PM CDT
• Mesoscale Discussion 1271Jun 7, 10:15 PM CDT
• Mesoscale Discussion 1272Jun 7, 11:01 PM CDT

000
WWUS20 KWNS 072126
SEL0  
SPC WW 072126
IAZ000-KSZ000-NEZ000-080500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 480
NWS STORM PREDICTION CENTER NORMAN OK
425 PM CDT SAT JUN 7 2008

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

       A LARGE PART OF WESTERN IOWA
       PARTS OF NORTHERN KANSAS
       A LARGE PART OF EASTERN NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON FROM 425 PM UNTIL MIDNIGHT CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 20 MILES EAST OF DENISON
IOWA TO 65 MILES SOUTH SOUTHWEST OF KEARNEY NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 478...WW 479...

DISCUSSION...VERY TO EXTREMELY UNSTABLE AIR MASS WITH MLCAPES TO
3500 J/KG AND STRONG DEEP LAYER SHEAR AVAILABLE FOR SUPERCELL
DEVELOPMENT ACROSS THE WATCH AREA.  STORMS WILL DEVELOP RAPIDLY
ALONG WARM FRONT FROM NRN KS INTO WRN IA.  ALONG WITH VERY LARGE
HAIL...DAMAGING DOWNBURST WINDS...TORNADOES WILL BE LIKELY WITH ANY
SUPERCELL. STORMS EXPECTED TO DEVELOP UPSCALE DURING THE EVENING
INTO ONE OR MORE MCS/S.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 24035.


...HALES

Tornado Watches in Nebraska, 2008Tornado Watches in Iowa, 2008Tornado Watches in Kansas, 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.