Tornado Watch 549

Issued

Jul 1, 1997, 4:00 PM CDT (21:00 UTC)

Expired

Jul 1, 1997, 9:00 PM CDT

In force

5 hr

Issued by

the Storm Prediction Center

Counties Burleigh County, ND, Dunn County, ND, Emmons County, ND, Grant County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Oliver County, ND, Sioux County, ND, Campbell County, SD, Corson County, SD, Dewey County, SD, Edmunds County, SD, Potter County, SD, Walworth County, SD

The Bismarck radar (KBIS), 17 km from the middle of the area, began a volume at 21:01 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 012027
MKC WW 012027
SDZ000-NDZ000-020200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 549
STORM PREDICTION CENTER NORMAN OK
327 PM CDT TUE JUL 1 1997

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

   NORTH CENTRAL SOUTH DAKOTA                       
   SOUTHWEST AND SOUTH CENTRAL NORTH DAKOTA                       

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 400 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 1 3/4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 55 STATUTE MILES EITHER SIDE OF
A LINE FROM ROSEGLEN NORTH DAKOTA TO 50 MILES SOUTH SOUTHEAST OF
MOBRIDGE 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.

OTHER WATCH INFORMATION...  CONTINUE...WW 547...WW 548...

DISCUSSION...LINE OF THUNDERSTORMS IS INTENSIFYING IN ASSOCIATION
WITH UPPER LEVEL VORTICITY MAXIMA MOVING ACROSS NORTHWEST SOUTH
DAKOTA.  LOW LEVEL MOISTURE HAS PERSISTED OVER NORTH SOUTH DAKOTA
AND PARTS OF NORTH DAKOTA...AND STEEP LAPSE RATES ACCOMPANYING COLD
CORE ALOFT ARE CONTRIBUTING TO MODERATE INSTABILITY /LIFTED INDEX
TO -6/.  VAD PROFILES INDICATE SUFFICIENT VERTICAL SHEAR TO ENHANCE
THREAT OF SEVERE THUNDERSTORMS INCLUDING CHANCE OF ISOLATED
TORNADOES.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 3/4 INCHES.  EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450.  MEAN STORM MOTION VECTOR 22025.


...WEISS

;480,1004 451,0990 443,1010 472,1025;

Tornado Watches in North Dakota, 1997Tornado Watches in South Dakota, 1997Every tornado watch in 1997

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.