Tornado Watch 355

Issued

Jun 6, 2007, 7:36 PM CDT (00:36 UTC)

Expired

Jun 7, 2007, 2:35 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The Sioux Falls radar (KFSD), 177 km from the middle of the area, began a volume at 00:38 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

30%

Ten or more severe wind reports

50%

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 1029Jun 6, 6:56 PM CDT
• Mesoscale Discussion 1031Jun 6, 10:53 PM CDT

000
WWUS20 KWNS 070040
SEL5  
SPC WW 070040
NEZ000-SDZ000-070800-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 355
NWS STORM PREDICTION CENTER NORMAN OK
740 PM CDT WED JUN 6 2007

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

       NORTHERN AND CENTRAL NEBRASKA
       EASTERN AND SOUTHERN SOUTH DAKOTA

EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 740 PM
UNTIL 300 AM CDT.

TORNADOES...HAIL TO 2.5 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 EAST AND WEST OF A LINE FROM 30 MILES EAST NORTHEAST OF
HURON SOUTH DAKOTA TO 35 MILES WEST OF KEARNEY NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).

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 353...WW 354...

DISCUSSION...TSTMS EXPECTED TO FORM LATER THIS EVENING INVOF MCS
OUTFLOW BOUNDARY/DRY LINE INTERSECTION OVER NRN AND CNTRL NEB. 
OTHER STORMS SHOULD CONTINUE TO FORM ALONG MCS OUTFLOW IN SD. 
STRENGTHENING WIND FIELD ASSOCIATED WITH CONTINUED ENE MOTION OF
POTENT CO SHORT WAVE TROUGH...DIURNAL DECOUPLING OF THE BOUNDARY
LAYER...AND INCREASING LOW LEVEL MOISTURE RETURN SUGGEST POTENTIAL
FOR A FEW SUSTAINED SUPERCELLS WITH LARGE HAIL/HIGH WIND AND
POSSIBLE TORNADOES INTO EARLY THURSDAY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 23035.


...CORFIDI

Tornado Watches in Nebraska, 2007Tornado Watches in South Dakota, 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.