Tornado Watch 232

Issued

May 8, 2005, 1:50 PM CDT (18:50 UTC)

Expired

May 8, 2005, 9:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

The Aberdeen radar (KABR), 140 km from the middle of the area, began a volume at 18:53 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 776May 8, 1:10 PM CDT
• Mesoscale Discussion 781May 8, 5:27 PM CDT
• Mesoscale Discussion 785May 8, 7:14 PM CDT

000 
WWUS20 KWNS 081849
SEL2  
SPC WW 081849
IAZ000-MNZ000-NDZ000-NEZ000-SDZ000-090200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 232
NWS STORM PREDICTION CENTER NORMAN OK
150 PM CDT SUN MAY 8 2005

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

       NORTHWESTERN IOWA
       WESTERN MINNESOTA
       SOUTHEASTERN NORTH DAKOTA
       FAR NORTHEASTERN NEBRASKA
       EASTERN SOUTH DAKOTA

EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 150 PM UNTIL 900
PM CDT.

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 90 STATUTE MILES
EAST AND WEST OF A LINE FROM 105 MILES NORTH NORTHEAST OF ABERDEEN
SOUTH DAKOTA TO 10 MILES SOUTH SOUTHWEST OF SIOUX CITY IOWA.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU2).

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 231...

DISCUSSION...AIR MASS CONTINUES TO DESTABILIZE AHEAD OF SLOW MOVING
UPPER TROUGH AND ASSOCIATED SURFACE COLD FRONT NOW MOVING INTO
CENTRAL SD/NEB.  AS LARGE SCALE ASCENT OVERSPREADS THE WARM
SECTOR...THUNDERSTORMS WILL DEVELOP AND BECOME SEVERE DURING THE
NEXT HOUR TO TWO.  DEEP LAYER SHEAR WILL BE SUPPORTIVE OF SUPERCELLS
AND LINEAR STRUCTURES WITH PRIMARY THREAT OF VERY LARGE HAIL. 
TORNADOES WILL ALSO BECOME A THREAT LATER TODAY AS SURFACE WINDS
BACK AHEAD OF SURFACE LOW AND SLY LLJ INCREASES.  WIND DAMAGE
POTENTIAL MAY ALSO EVOLVE INTO THE EVENING AS STORMS ORGANIZE INTO
SMALL LINES/BOW ECHOES.

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 22025.


...EVANS

465,0954 421,0944 421,0981 465,0992

Tornado Watches in South Dakota, 2005Tornado Watches in Minnesota, 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.