Severe Thunderstorm Watch 99

Issued

Apr 16, 2002, 5:45 PM CDT (22:45 UTC)

Expired

Apr 17, 2002, 12:00 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

The Fargo/Grand Forks radar (KMVX), 173 km from the middle of the area, began a volume at 22:49 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 
WWUS20 KWNS 162238
SEL9  
SPC WW 162232
MNZ000-NDZ000-SDZ000-170500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 99
STORM PREDICTION CENTER NORMAN OK
532 PM CDT TUE APR 16 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN MINNESOTA                          
   EASTERN NORTH DAKOTA                       
   EASTERN SOUTH DAKOTA                       

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 545 PM
UNTIL MIDNIGHT CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 85 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF WARROAD
MINNESOTA TO 10 MILES SOUTH SOUTHEAST OF WORTHINGTON MINNESOTA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 96...WW 97...WW 98...

DISCUSSION...THUNDERSTORMS..INCLUDING SUPERCELLS...EXPECTED TO
SPREAD NWD INTO RED RIVER VALLEY AREA DURING NEXT SEVERAL HOURS AS
LOW LEVEL CONVERGENCE/DEEP ASCENT INCREASE OVER REGION DOWNSTREAM
FROM WRN NEB UPPER TROUGH.  DOMINANT CONVECTIVE MODE EXPECTED TO BE
A SQUALL LINE WITH EMBEDDED BOW SEGMENTS...ALTHOUGH A FEW DISCRETE
SUPERCELLS COULD DEVELOP AHEAD OF MAIN LOW LEVEL CONVERGENCE AXIS
DURING THE NEXT FEW HOURS.  

AVIATION...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 19035.

...CORFIDI

490,0935 433,0934 433,0971 490,0973

WWUS20 KWNS 162238
SEL9  
SPC WW 162232
MNZ000-NDZ000-SDZ000-170500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 99
STORM PREDICTION CENTER NORMAN OK
532 PM CDT TUE APR 16 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   WESTERN MINNESOTA                          
   EASTERN NORTH DAKOTA                       
   EASTERN SOUTH DAKOTA                       

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 545 PM
UNTIL MIDNIGHT CDT.

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

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 85 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES WEST NORTHWEST OF WARROAD
MINNESOTA TO 10 MILES SOUTH SOUTHEAST OF WORTHINGTON MINNESOTA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 96...WW 97...WW 98...

DISCUSSION...THUNDERSTORMS..INCLUDING SUPERCELLS...EXPECTED TO
SPREAD NWD INTO RED RIVER VALLEY AREA DURING NEXT SEVERAL HOURS AS
LOW LEVEL CONVERGENCE/DEEP ASCENT INCREASE OVER REGION DOWNSTREAM
FROM WRN NEB UPPER TROUGH.  DOMINANT CONVECTIVE MODE EXPECTED TO BE
A SQUALL LINE WITH EMBEDDED BOW SEGMENTS...ALTHOUGH A FEW DISCRETE
SUPERCELLS COULD DEVELOP AHEAD OF MAIN LOW LEVEL CONVERGENCE AXIS
DURING THE NEXT FEW HOURS.  

AVIATION...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 19035.

...CORFIDI

490,0935 433,0934 433,0971 490,0973

Severe Thunderstorm Watches in Minnesota, 2002Severe Thunderstorm Watches in South Dakota, 2002Severe Thunderstorm Watches in North Dakota, 2002Every severe thunderstorm watch in 2002

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.