Tornado Watch 570

Issued

Jun 23, 2003, 6:45 PM CDT (23:45 UTC)

Expired

Jun 23, 2003, 11:00 PM CDT

In force

4 hr

Issued by

the Storm Prediction Center

The Sioux Falls radar (KFSD), 31 km from the middle of the area, began a volume at 23:46 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 1475Jun 23, 6:24 PM CDT
• Mesoscale Discussion 1480Jun 23, 9:10 PM CDT
• Mesoscale Discussion 1481Jun 23, 10:38 PM CDT

000 
WWUS20 KWNS 232348
SEL0  
SPC WW 232345
IAZ000-MNZ000-SDZ000-240400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 570 
NWS STORM PREDICTION CENTER NORMAN OK 
645 PM CDT MON JUN 23 2003

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

       NORTHWEST IOWA
       SOUTHWEST MINNESOTA
       EASTERN SOUTH DAKOTA

EFFECTIVE THIS MONDAY EVENING FROM 645 PM UNTIL 1100 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 95 STATUTE MILES EAST AND WEST
OF A LINE FROM 10 MILES SOUTH OF YANKTON SOUTH DAKOTA TO 55 MILES
NORTH NORTHWEST OF REDWOOD FALLS MINNESOTA.

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...THIS TORNADO WATCH REPLACES SEVERE
THUNDERSTORM WATCH NUMBER 566. WATCH NUMBER 566 WILL NOT BE IN
EFFECT AFTER 645 PM CDT. CONTINUE...WW 567...WW 568...WW 569...


DISCUSSION...COMBINATION OF ASCENT ALONG STRENGTHENING SLY LLJ THIS
EVENING AND MODERATE INSTABILITY ALREADY IN PLACE WILL SUPPORT
INCREASING CONVECTION ACROSS WW THROUGH THE LATE EVENING.  LOW AND
DEEP LAYER SHEAR WILL LIKELY INCREASE AS LLJ DEVELOPS AND ENHANCE
THE POTENTIAL FOR SUPERCELLS AND ATTENDANT THREAT OF TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.
MEAN STORM MOTION VECTOR 24035.


...EVANS

424,0991 451,0972 451,0933 424,0953

Tornado Watches in South Dakota, 2003Tornado Watches in Minnesota, 2003Tornado Watches in Iowa, 2003Every tornado watch in 2003

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.