Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 33, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 9, 1991, 3:51 PM MDT for Weld County, Colorado. It was in force for 39 min.
The area
The counties it named.
The facts
- Issued
- Jun 9, 1991, 3:51 PM MDT (21:51 UTC)
- Expired
- Jun 9, 1991, 4:30 PM MDT
- In force
- 39 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Weld County, CO
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 9.9 hours before the alert went out and 125 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
- 2 J/kg
- Mixed-layer CIN
- -512 J/kg
- Mixed-layer LCL
- 2648 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 092153
TORDEN
COC123-092230-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
351 PM MDT SUN JUN 09 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 430 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
NORTHEASTERN WELD
INCLUDING THE FOLLOWING TOWNS/CITIES
GROVER
AT 351 PM MDT RADAR INDICATED A POSSIBLE TORNADO 8 MILES EAST OF GROVER
...OR ABOUT 46 MILES NORTHEAST OF GREELEY. AT 351 THE PUBLIC REPORTED A
TORNADO AT ABOUT THE SAME LOCATION.
THE STORM PRODUCING THE TORNADO WAS MOVING TO THE EAST-SOUTHEAST AT 15
MPH.
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET
UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO
BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE
BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE
BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY FROM
WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN
THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH
YOUR HANDS.
A TORNADO WATCH REMAINS IN EFFECT FOR NORTHEAST COLORADO TIL 900 PM.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
MCQUEEN
LAT...LON 4064 10359 4072 10422 4098 10426 4098 10360What 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 9, 3:05 PM MDT, 46 minutes before
COZ011-012-013-014-092200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 305 PM MDT SUN JUN 9 1991 ...TORNADO WATCH FOR MOST OF NORTHEAST COLORADO TIL 900 PM MDT... AT 305 PM MDT RADAR WAS SHOWING A STRONG THUNDERSTORM OVER NORTHERN LARIMER COUNTY ABOUT 30 MILES NORTH OF FORT COLLINS. THIS STORM WAS MOVING TO THE EAST-SOUTHEAST AT 25 MPH AND WILL CROSS EXTREME NORTHEAST LARIMER COUNTY BY 400 PM. A FEW OTHER THUNDERSTORMS WERE DEVELOPING OVER EASTERN LARIMER AND WESTERN WELD COUNTY...AND SOUTHERN PARTS OF DOUGLAS AND ARAPAHOE COUNTIES. THESE STORMS WERE MOVING EAST AT 25 MPH. A TORNADO WATCH IS IN EFFECT UNTIL 900 PM FOR MOST OF NORTHEAST COLORADO. IN THE DENVER METRO AREA...THIS IS TO THE EAST OF SHERIDAN BOULEVARD. LISTEN TO NOAA WEATHER RADIO...OR LOCAL RADIO AND T.V....FOR UPDATES OR WARNINGS THIS AFTERNOON AND EVENING. MCQUEEN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 6:30 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips | 45 min |
| Jun 9, 3:35 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 55 min |
| Jun 9, 4:30 PM MDT | Tornado Warning | BOU | Weld | 45 min |
| Jun 9, 5:10 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 35 min |
| Jun 9, 5:12 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Jefferson | 48 min |
| Jun 9, 5:16 PM MDT | Tornado Warning | BOU | Weld | 59 min |
| Jun 9, 5:59 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver | 61 min |
Nearby
Tornado Warnings in Colorado, 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.