Alert archive / Nebraska / Tornado Warnings in 1991

Tornado Warning 38, NWS Cheyenne, WY

July 9, 1991Box Butte County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jul 9, 1991, 12:57 PM MDT for Box Butte County, Nebraska. It was in force for 33 min.

The area

The counties it named.

The facts

Issued: Jul 9, 1991, 12:57 PM MDT (18:57 UTC)
Expired: Jul 9, 1991, 1:30 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Whole counties

County Box Butte County, NE

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 7.0 hours before the alert went out and 206 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: 42 J/kg
Mixed-layer CIN: -343 J/kg
Mixed-layer LCL: 1859 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBFF 091857
TORBFF
NEC013-091930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING 
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1257 PM MDT TUE JUL 9 1991

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 130 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY

   IN THE PANHANDLE OF NEBRASKA
      EASTERN BOX BUTTE

AT 1252 PM MDT...A CITIZEN REPORTED A TORNADO 10 MILES NORTH OF
ALLIANCE...MOVING EAST AT 10 MPH.
=
THE WARNING DOES NOT INCLUDE THE CITY OF ALLIANCE.

TAKE SHELTER IN A BASEMENT IF AVAILABLE.  OTHERWISE GO TO A SMALL
INTERIOR ROOM ON THE LOWEST FLOOR.  STAY AWAY FROM WINDOWS.  ABANDON
CARS AND MOBILE HOMES.

PEEK

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 9, 10:45 AM MDT, 2 hours 12 minutes before

NEZ001-005-011-091745-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1045 AM MDT MON JUL 9 1991

...THUNDERSTORMS IN THE NORTH NEBRASKA PANHANDLE...

AT 1043 AM MDT...THUNDERSTORMS WERE SHOWN BY RADAR IN SIOUX COUNTY FROM
25 MILES NORTH OF SCOTTSBLUFF TO 30 MILES SOUTHWEST OF CHADRON.  THE
STORMS WERE MOVING EAST AT NEARLY 15 MPH.

BRIEF HEAVY RAIN...STRONG GUSTY WIND...AND DANGEROUS LIGHTNING ARE
POSSIBLE WITH THESE STORMS I
N CENTRAL SIOUX AND SOUTHWEST DAWES COUNTY
UNTIL 1145 AM MDT.
PEEK

Special weather statement, Jul 9, 11:22 AM MDT, 1 hour 35 minutes before

NEZ001-005-011-091820-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1122 AM MDT MON JUL 9 1991

...THUNDERSTORMS IN THE NEBRASKA PANHANDLE...

AT 1120 AM MDT...THUNDERSTORMS WERE SHOWN BY RADAR FROM 20 MILES
SOUTHWEST TO 15 MILES WEST OF SCOTTSBLUFF...AND 30 MILES NORTHWEST OF
SCOTTSBLUFF.  MOVEMENT WAS TO THE EAST AT 10 MPH.

BRIEF HEAVY RAIN...STRONG GUSTY WIND...DANGEROUS LIGHTNING AND SMALL
HAIL ARE POSSIBLE IN SIOUX...S8COTTS BLUFF...EXTREME SOUTHWEST DAWES AND
NORTHERN BANNER COUNTIES UNTIL 1220 PM MDT.
PEEK

Special weather statement, Jul 9, 12:21 PM MDT, 36 minutes before

NEZ001-005-011-091920-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SCOTTSBLUFF NE
1221 PM MDT MON JUL 9 1991

...THUNDERSTORMS IN THE NEBRASKA PANHANDLE...

AT 1219 PM MDT...THUNDERSTORMS WERE SHOWN BY RADAR FROM JUST WEST OF
SCOTTSBLUFF TO 20 MILES WEST OF ALLIANCE.  MOVEMENT WAS EAST AT LESS
THAN 10 MPH.

HEAVY RAIN...LOCALIZED FLOODING...DANGEROUS LIGHTNING AND EVEN SMALL
HAIL ARE POSSIBLE IN SCOTTS BLUFF AND WESTERN BOX BUTTE COUNTIES UNTIL
120 PM MDT.
PEEK

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 9, 1:35 PM MDT	Severe Thunderstorm Warning	CYS	Sheridan	40 min
Jul 9, 1:35 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte	23 min
Jul 9, 2:14 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	30 min
Jul 9, 2:14 PM MDT	Severe Thunderstorm Warning	CYS	Deuel, Garden	61 min

Nearby

Tornado Warnings in Nebraska, 1991 Every tornado warning in 1991 Tornadoes in 1991

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.