Tornado Watch 489

Issued

Jun 20, 1997, 2:30 PM MDT (20:30 UTC)

Expired

Jun 20, 1997, 9:00 PM MDT

In force

7 hr

Issued by

the Storm Prediction Center

The North Platte radar (KLNX), 105 km from the middle of the area, began a volume at 20:30 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.

663 
WWUS9 KMKC 201951
SEL9  
MKC WW 201951
NEZ000-WYZ000-COZ000-210300-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 489
STORM PREDICTION CENTER NORMAN OK
151 PM MDT FRI JUN 20 1997

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

   WESTERN AND CENTRAL NEBRASKA                           
   EASTERN WYOMING                            
   NORTHEAST COLORADO                           

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 230 PM UNTIL 900
PM MDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 85 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 110 STATUTE MILES EAST AND WEST
OF A LINE FROM 10 MILES NORTH NORTHEAST OF CHADRON NEBRASKA TO 30
MILES WEST SOUTHWEST OF MCCOOK NEBRASKA.

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 488...

DISCUSSION...SUPERCELLS WITH THE POTENTIAL FOR TORNADOES POSSIBLE
THIS AFTERNOON AND EVENING ACROSS WATCH AREA.  MOIST EASTERLY FLOW
N OF E/W OUTFLOW BOUNDARY IN SOUTHERN PART OF WATCH WILL MAINTAIN
FAVORABLE STORM-RELATIVE INFLOW FOR CONVECTION DEVELOPING EWD FROM
WY.  THE LATTER ACTIVITY IS FORMING ALONG COLD FRONT THAT IS
BECOMING STATIONARY OVER NORTHERN PART OF WATCH.  ADDITIONAL STORMS
MAY INITIATE ALONG THIS BOUNDARY OVER NORTHERN NEBRASKA LATER
TODAY.     

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES.  EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 75 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. 
MEAN STORM MOTION VECTOR 27025.


...CORFIDI

425,1005 400,0990 400,1031 425,1051

Tornado Watches in Nebraska, 1997Tornado Watches in Colorado, 1997Tornado Watches in Wyoming, 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.