Tornado Watch 412

Issued

Jun 12, 2001, 6:00 PM CDT (23:00 UTC)

Expired

Jun 13, 2001, 12:00 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Sioux Falls radar (KFSD), 76 km from the middle of the area, began a volume at 23:03 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.

000 
WWUS9 KMKC 122247
SEL2  

SEL2  
MKC WW 122242
IAZ000-MNZ000-NEZ000-SDZ000-130500-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 412
STORM PREDICTION CENTER NORMAN OK
542 PM CDT TUE JUN 12 2001

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

   NORTHWEST IOWA                               
   SOUTHWEST MINNESOTA                          
   NORTHEAST NEBRASKA                           
   SOUTHEAST SOUTH DAKOTA                       

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

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 80 MILES SOUTHWEST OF MITCHELL SOUTH DAKOTA TO
35 MILES SOUTHEAST OF SPENCER 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 407...WW 408...WW
409...WW 410...WW 411...

DISCUSSION...STRONG UPWARD MOTION AS LOW LEVEL JET INTERSECTS E/W
BOUNDARY ACROSS NERN NEB INTO NRN IA.  WITH VERY UNSTABLE AND
WEAKLY CAPPED AIRMASS S OF BOUNDARY...RAPID DEVELOPMENT OF SEVERE
THUNDERSTORMS/SUPERCELLS  EXPECTED VICINITY OF BOUNDARY.  WITH
STEEP LAPSE RATE AND VEERING SHEAR PROFILES...VERY LARGE HAIL AND
ISOLATED TORNADOES ARE LIKELY.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. 
MEAN STORM MOTION VECTOR 24035.


...HALES

;435,0990 434,0943 415,0943 420,0990;

Tornado Watches in Iowa, 2001Tornado Watches in South Dakota, 2001Tornado Watches in Nebraska, 2001Every tornado watch in 2001

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.