Tornado Watch 243

Issued

May 10, 2005, 6:00 PM CDT (23:00 UTC)

Expired

May 11, 2005, 1:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

The Omaha radar (KOAX), 75 km from the middle of the area, began a volume at 23:00 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.

• Mesoscale Discussion 805May 10, 5:01 PM CDT
• Mesoscale Discussion 810May 10, 9:14 PM CDT
• Mesoscale Discussion 813May 10, 11:35 PM CDT

000 
WWUS20 KWNS 102301
SEL3  
SPC WW 102301
IAZ000-NEZ000-SDZ000-110600-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
600 PM CDT TUE MAY 10 2005

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

       WESTERN IOWA
       EASTERN NEBRASKA
       EXTREME SOUTHEAST SOUTH DAKOTA

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 600 PM
UNTIL 100 AM CDT.

TORNADOES...HAIL TO 3 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 65 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 50 MILES NORTH NORTHWEST OF GRAND
ISLAND NEBRASKA TO 55 MILES SOUTH OF FORT DODGE IOWA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

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 241...WW 242...

DISCUSSION...VISIBLE IMAGERY SHOWS DEEPENING CUMULUS ALONG THE E-W
FRONT ACROSS E CENTRAL NEB/W CENTRAL IA...WHERE DAYTIME HEATING AND
PERSISTENT CONVERGENCE APPEAR TO BE WEAKENING THE CAP. THUNDERSTORM
DEVELOP WILL BE POSSIBLE THIS EVENING ALONG THE BOUNDARY...WHERE
VERTICAL SHEAR AND INSTABILITY WILL BE FAVORABLE FOR SUPERCELLS WITH
VERY LARGE HAIL AND DAMAGING WINDS.  THOUGH TEMPERATURE-DEWPOINT
SPREADS ARE SOMEWHAT LARGE /25-30 F/...ENHANCED LOW-LEVEL SHEAR
ALONG THE BOUNDARY AND A TENDENCY FOR INCREASING MOISTURE FROM THE S
LATER THIS EVENING MAY SUPPORT A COUPLE OF TORNADOES. 
LASTLY...THUNDERSTORM COVERAGE WILL LIKELY INCREASE TONIGHT IN
CONJUNCTION WITH WAA ON THE NOSE OF A STRENGTHENING LOW-LEVEL
JET...WHEN UPSCALE GROWTH INTO AN MCS WILL BE POSSIBLE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 27025.


...THOMPSON

423,0984 424,0941 404,0941 404,0984

Tornado Watches in Nebraska, 2005Tornado Watches in Iowa, 2005Every tornado watch in 2005

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.