Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 34, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 9, 1991, 4:30 PM MDT for Weld County, Colorado. It was in force for 45 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 9, 1991, 4:30 PM MDT (22:30 UTC)
- Expired
- Jun 9, 1991, 5:15 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Weld County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 9, 4:51 PM MDT | Tornado F1 | Weld, CO | |
| Jun 9, 5:02 PM MDT | Tornado F0 | Weld, CO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 10.5 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 092231
TORDEN
COC123-092315-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
430 PM MDT SUN JUN 09 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 515 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
NORTHEASTERN WELD
INCLUDING THE FOLLOWING TOWNS/CITIES
KEOTA...NEW RAYMER...AND STONEHAM
AT 427 PM MDT REPORTS CONTINUE TO BE RECEIVED OF A TORNADO 15 MILES
NORTHWEST OF STONEHAM...10 MILES NORTH OF NEW RAYMER...OR ABOUT 42 MILES
WEST OF STERLING.
THE STORM PRODUCING THE TORNADO WAS MOVING TO THE EAST-SOUTHEAST AT
ABOUT 10 MPH AND IS LIKELY ALSO PRODUCING VERY LARGE HAIL AND INTENSE
RAINFALL.
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.
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 4066 10360 4073 10409 4097 10408 4098 10359UWhat 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, 1 hour 25 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, 3:51 PM MDT | Tornado Warning | BOU | Weld | 39 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.