Alert archive / Nebraska / Tornado Watches in 1997

Tornado Watch 753

October 11, 199722 counties in Nebraska

The Storm Prediction Center issued this tornado watch at Oct 11, 1997, 11:00 PM MDT for 22 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Oct 11, 1997, 11:00 PM MDT (05:00 UTC)
Expired: Oct 12, 1997, 5:00 AM MDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 22 counties

Arthur County, NE, Blaine County, NE, Brown County, NE, Chase County, NE, Cherry County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Frontier County, NE, Hayes County, NE, Hitchcock County, NE, Hooker County, NE, Keith County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, McPherson County, NE, Perkins County, NE, Red Willow County, NE, Rock County, NE, Thomas County, NE

The radar

The North Platte radar (KLNX), 93 km from the middle of the area, began a volume at 05:04 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.0 hours before the alert went out and 31 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 990 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1102 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 247 m²/s²
0-3 km storm-relative helicity: 328 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

767 
WWUS9 KMKC 120447
SEL3  
MKC WW 120447
NEZ000-121100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 753
STORM PREDICTION CENTER NORMAN OK
1147 PM CDT SAT OCT 11 1997

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

   CENTRAL NEBRASKA                           

EFFECTIVE THIS SUNDAY MORNING FROM MIDNIGHT CDT UNTIL 600 AM CDT.

TORNADOES...HAIL TO 1 1/4 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES EAST AND WEST
OF A LINE FROM 35 MILES WEST SOUTHWEST OF MCCOOK NEBRASKA TO 25
MILES EAST NORTHEAST OF VALENTINE 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 747...WW 748...WW
749...WW 750...WW 751...WW 752...

DISCUSSION...BOW ECHOES AND ISOLATED BOWHEAD TORNADOES POSSIBLE
DURING THE OVERNIGHT HOURS AS EXIT REGION OF UPPER SPEED MAX
APPROACHES FROM THE SOUTHWEST.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 1/4 INCHES.  EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450.  MEAN STORM MOTION VECTOR 21545.


...CORFIDI

400,1021 425,1011 425,0985 400,1000

Nearby

Tornado Watches in Nebraska, 1997 Every tornado watch in 1997

Sources

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.