Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 28, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 1, 1991, 6:33 PM MDT for Larimer County, Colorado. It was in force for 27 min.
The area
The counties it named.
The facts
- Issued
- Jun 1, 1991, 6:33 PM MDT (00:33 UTC)
- Expired
- Jun 1, 1991, 7:00 PM MDT
- In force
- 27 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Larimer County, CO
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 0.6 hours before the alert went out and 209 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1289 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -342 m²/s²
- 0-3 km storm-relative helicity
- -213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -4.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 020036 COR
TORDEN
COC069-020100-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING...CORRECTION TO CONTINUE WATCH
NATIONAL WEATHER SERVICE DENVER CO
633 PM MDT SAT JUN 01 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTH CENTRAL COLORADO
SOUTH CENTRAL LARIMER
INCLUDING THE FOLLOWING TOWNS/CITIES
DRAKE...CARTER LAKE AREA...
AT 633 PM MDT RADAR INDICATED A POSSIBLE TORNADO 13 MILES SOUTHEAST OF
DRAKE ...OR ABOUT 22 MILES SOUTH OF FORT COLLINS. THE PUBLIC REPORTED
TWO FUNNEL CLOUDS OVER CARTER LAKE AT 633 PM.
THE STORM PRODUCING THE TORNADO WAS MOVING AT ABOUT 20 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 SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR MOST OF NORTHEAST
COLORADO UNTIL 11 PM MDT.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER%.
ET
LAT...LON 4028 10513 4028 10528 4044 10541 4049 10516What 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 1, 2:47 PM MDT, 3 hours 46 minutes before
COZ011-012200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 245 PM MDT SAT JUN 1 1991 ...STRONG THUNDERSTORM IN FOOTHILLS NORTHWEST OF BOULDER... AT 240 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM BETWEEN LYONS AND JAMESTOWN IN NORTHERN BOULDER COUNTY...ABOUT 35 MILES NORTHWEST OF DENVER. THIS STORM WAS MOVING TO THE NORTHWEST AT 15 TO 20 MPH. ALL PEOPLE IN NORTHERN BOULDER COUNTY AND SOUTHWESTERN LARIMER COUNTY INCLUDING THE TOWNS OF JAMESTOWN...LYONS...RAYMOND...ALLENSPARK... MEEKER PARK AND ESTES PARK SHOULD BE ALERT FOR DANGEROUS FREQUENT LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THIS STORM UNTIL 400 PM MDT THIS AFTERNOON. HEAVY RAIN FROM THIS STORM WILL PRODUCE FLOODING OF NORMALLY DRY GULCHES...SMALL STREAMS...HIGHWAYS...AND LOW LYING OR FLOOD PRONE AREAS. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MOST OF NORTHEAST COLORADO UNTIL MIDNIGHT TONIGHT. GARD...WSFO DENVER
Special weather statement, Jun 1, 4:02 PM MDT, 2 hours 31 minutes before
COZ011-012300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 400 PM MDT SAT JUN 1 1991 ...STRONG THUNDERSTORMS OVER SOUTHWEST METRO DENVER... AT 355 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS OVER THE SOUTHWEST PORTION OF THE DENVER METRO AREA IN LAKEWOOD NEAR SOUTHWEST PLAZA SHOPPING CENTER. PEA TO MARBLE SIZE HAIL HAS BEEN REPORTED FROM THESE STORMS. THE STORMS WERE MOVING TO THE NORTHWEST AT 15 TO 20 MPH AND WILL BE MOVING OVER MORRISON... EVERGREEN AND GOLDEN. ALL PEOPLE IN WEST AND SOUTHWEST METRO DENVER SHOULD BE ALERT FOR DANGEROUS FREQUENT LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THESE STORMS UNTIL 500 PM MDT THIS AFTERNOON. HEAVY RAIN FROM THIS STORM WILL PRODUCE FLOODING OF NORMALLY DRY GULCHES...SMALL STREAMS...HIGHWAYS...STREETS...AND LOW LYING OR FLOOD PRONE AREAS INCLUDING LENA GULCH. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR MOST OF NORTHEAST COLORADOd UNTIL MIDNIGHT TONIGHT. GARD...WSFO DENVER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 6:07 PM MDT | Tornado Warning | BOU | Boulder | 38 min |
| Jun 1, 8:02 PM MDT | Flash Flood Warning | BOU | Larimer | 3 hr |
| Jun 1, 11:00 PM MDT | Flash Flood Warning | BOU | Larimer | 2 hr |
| Jun 2, 5:01 PM MDT | Tornado Warning | BOU | Adams, Larimer, Weld | 29 min |
| Jun 2, 5:01 PM MDT | Tornado Warning | BOU | Denver | 29 min |
| Jun 2, 5:27 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Boulder, Denver, Jefferson | 48 min |
| Jun 2, 5:27 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 48 min |
| Jun 2, 5:41 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan, Washington | 64 min |
| Jun 2, 5:45 PM MDT | Flash Flood Warning | BOU | Denver | 75 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.