Alert archive / Montana / Tornado Warnings in 1991
Tornado Warning 13, NWS Billings, MT
NWS Billings, MT issued this tornado warning at Jun 21, 1991, 6:22 PM MDT for Big Horn County, Montana. It was in force for 68 min.
The area
The counties it named.
The facts
- Issued
- Jun 21, 1991, 6:22 PM MDT (00:22 UTC)
- Expired
- Jun 21, 1991, 7:30 PM MDT
- In force
- 68 min
- Issued by
- NWS Billings, MT
- Area
- Whole counties
County Big Horn County, MT
The nearest sounding before it
Lander/Hunt Fiel, WY (KLND), launched 00:00Z, 0.4 hours before the alert went out and 305 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.
- Mixed-layer CAPE
- 759 J/kg
- Mixed-layer CIN
- -141 J/kg
- Mixed-layer LCL
- 2029 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KBIL 220022
TORBIL
MTC003-220130-
BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BILLINGS MT
622 PM MDT FRI JUN 21 1991
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 730 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY
IN THE STATE OF MONTANA
NORTHERN BIG HORN
AT 615PM MDT THE BIG HORN COUNTY SHERIFF REPORTED A FUNNEL CLOUD
AT CROW AGENCY MONTANA. WEATHER RADAR SHOWS THE THUNDERSTORMS
IN THIS AREA TO BE MOVING NORTHEAST AT 25 MPH.
DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF
A TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO
STRUCTURE IS NEARBY...TAKE SHELTER IN A DITCH OR LOW SPOT.
STAY ALERT. IF THREATENING WEATHER IS SIGHTED GO TO A SAFE PLACE
IMMEDIATELY. WHEN IT IS SAFE PLEASE RELAY YOUR REPORT OF SEVERE
WEATHER TO THE NEAREST LAW ENFORCvEMENT AGENCY.
END/FORBESWhat 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, Jun 21, 1:48 PM MDT, 4 hours 34 minutes before
WYZ003-004-005-212300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHERIDAN WY 150 PM MDT WED JUN 21 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SHERIDAN AND JONHSON COUNTIES UNTIL 8 PM MDT THIS EVENING... AT 130 PM MDT RADAR SHOWED THUNDERSTORMS STARTING TO DEVELOP IN NORTH CENTRAL WYOMING. AT THIS TIME NO SEVERE WEATHER HAS BEEN REPORTED. THE STRONGEST OF THESE STORMS IS SOUTH OF SHERIDAN ABOUT 25 MILES MOVING NORTHEAST. ,PERSONS IN NORTH CENRAL WYOMING SHOULD KEEP AN EYE ON THE WEATHER AND IF THREATENING WEATHER IS SIGHT GO TO A SAFE PLACE. ZEGLIN
Special weather statement, Jun 21, 4:47 PM MDT, 1 hour 35 minutes before
WYZ003-004-005-220200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHERIDAN WY 450 PM MDT WED JUN 21 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SHERIDAN AND JONHSON COUNTIES UNTIL 8 PM MDT THIS EVENING... AT 430 PM MDT RADAR SHOWED SOME WIDELY SCATTERED THUNDERSTORMS IN NORTH CENTRAL WYOMING. AT THIS TIME NO SEVERE WEATHER HAS BEEN REPORTED IN THE AREA. THESE THUNDERSTORMS ARE MOVING NORTHEAST A ABOUT 25 MILES AN HOUR. PERSO5NS IN NORTH CENRAL WYOMING SHOULD KEEP AN EYE ON THE WEATHER AND IF THREATENING WEATHER IS SIGHTED GO TO A SAFE PLACE. ZEGLIN
Special weather statement, Jun 21, 4:49 PM MDT, 1 hour 33 minutes before
WYZ003-004-005-220200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SHERIDAN WY 450 PM MDT FRI JUN 21 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR SHERIDAN AND JONHSON COUNTIES UNTIL 8 PM MDT THIS EVENING... AT 430 PM MDT RADAR SHOWED SOME WIDELY SCATTERED THUNDERSTORMS IN NORTH CENTRAL WYOMING. AT THIS TIME NO SEVERE WEATHER HAS BEEN REPORTED IN THE AREA. THESE THUNDERSTORMS ARE MOVING NORTHEAST A ABOUT 25 MILES AN HOUR. PERSO6NS IN NORTH CENRAL WYOMING SHOULD KEEP AN EYE ON THE WEATHER AND IF THREATENING WEATHER IS SIGHTED GO TO A SAFE PLACE. ZEGLIN
The office that day
Everything else NWS Billings, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 6:21 PM MDT | Flash Flood Warning | BYZ | Musselshell | 3 hr |
| Jun 21, 6:56 PM MDT | Flash Flood Warning | BYZ | Big Horn, Treasure | 3 hr |
| Jun 21, 8:41 PM MDT | Tornado Warning | BYZ | Custer, Rosebud | 64 min |
| Jun 21, 9:36 PM MDT | Flash Flood Warning | BYZ | Musselshell | 3 hr |
| Jun 21, 9:36 PM MDT | Flash Flood Warning | BYZ | Big Horn, Treasure | 3 hr |
| Jun 21, 11:36 PM MDT | Flash Flood Warning | BYZ | Musselshell | 6 hr |
| Jun 21, 11:36 PM MDT | Flash Flood Warning | BYZ | Treasure | 6 hr |
Nearby
Tornado Warnings in Montana, 1991Every tornado warning in 1991Tornadoes 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.