Tornado Watch 321

Issued

May 29, 2004, 2:05 PM CDT (19:05 UTC)

Expired

May 29, 2004, 10:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

The Sioux Falls radar (KFSD), 98 km from the middle of the area, began a volume at 19:05 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 971May 29, 12:42 PM CDT
• Mesoscale Discussion 977May 29, 5:01 PM CDT
• Mesoscale Discussion 981May 29, 7:04 PM CDT
• Mesoscale Discussion 983May 29, 8:45 PM CDT
• Mesoscale Discussion 984May 29, 9:21 PM CDT

000 
WWUS20 KWNS 291909
SEL1  
SPC WW 291905
IAZ000-MNZ000-NEZ000-SDZ000-300300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 321
NWS STORM PREDICTION CENTER NORMAN OK
205 PM CDT SAT MAY 29 2004

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

       NORTHWEST IOWA
       SOUTHWEST MINNESOTA
       NORTHEAST NEBRASKA
       EASTERN SOUTH DAKOTA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 205 PM UNTIL
1000 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 65 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 135 STATUTE MILES EAST AND
WEST OF A LINE FROM 70 MILES NORTH OF WATERTOWN SOUTH DAKOTA TO 20
MILES SOUTHWEST OF SIOUX CITY IOWA.

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.

DISCUSSION...THUNDERSTORMS EXPECTED TO FORM DURING THE NEXT 1-2
HOURS INVOF WARM FRONT/INVERTED TROUGH INTERSECTION IN NE SD. 
ACTIVITY SHOULD ALSO DEVELOP SWD ALONG THOSE BOUNDARIES AS SURFACE
HEATING...CONTINUED BOUNDARY LAYER MOISTURE INFLOW AND APPROACH OF
KS UPPER LEVEL IMPULSE FURTHER DESTABILIZE REGION.  AMPLE CAPE AND
SHEAR /PER 18Z ABR RAOB/ SHOULD BE PRESENT SUPPORT SUPERCELLS WITH
HAIL.  TORNADO THREAT SHOULD BE GREATEST IN AREA OF BACKED LOW LEVEL
FLOW NEAR WARM FRONT.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 55 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.
MEAN STORM MOTION VECTOR 22025.


...CORFIDI

455,0941 420,0940 420,0991 455,0995

Tornado Watches in South Dakota, 2004Tornado Watches in Minnesota, 2004Tornado Watches in Iowa, 2004Every tornado watch in 2004

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.