Tornado Watch 415

Issued

Jun 13, 2001, 4:30 PM CDT (21:30 UTC)

Expired

Jun 13, 2001, 9:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

000 
WWUS9 KMKC 132054
SEL5  

SEL5  
MKC WW 132048
IAZ000-MNZ000-SDZ000-140200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 415
STORM PREDICTION CENTER NORMAN OK
348 PM CDT WED JUN 13 2001

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

   NORTHWEST IOWA                               
   WEST CENTRAL AND SOUTHWEST MINNESOTA                          
   EASTERN SOUTH DAKOTA                       

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 430 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 80 STATUTE MILES EAST AND WEST
OF A LINE FROM 55 MILES WEST OF ALEXANDRIA MINNESOTA TO 45 MILES
EAST OF YANKTON SOUTH DAKOTA.

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 ARE BEGINNING TO DEVELOP ALONG AND EAST
FRONTAL BOUNDARY OVER ERN SD WHERE SUSTAINED LOW LEVEL CONVERGENCE
HAS BEEN OCCURRING.  AIR MASS HAS BECOME EXTREMELY UNSTABLE WITH
WITH MUCAPE OF 3000-4000 J/KG.  VERTICAL SHEAR WILL BE INCREASING
THIS EVENING AS 50 KT MID LEVEL JET STREAK LIFTS NEWD ACROSS THE
AREA...ENHANCING POTENTIAL FOR SEVERE THUNDERSTORMS INCLUDING
POSSIBLE TORNADOES.  


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. 
MEAN STORM MOTION VECTOR 21035.


...WEISS

;455,0945 425,0945 425,0980 455,0981;

Tornado Watches in South Dakota, 2001Tornado Watches in Minnesota, 2001Tornado Watches in Iowa, 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.