Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 16, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 31, 1991, 9:37 PM MDT for Morgan County, Colorado. It was in force for 38 min. 1 report 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
- May 31, 1991, 9:37 PM MDT (03:37 UTC)
- Expired
- May 31, 1991, 10:15 PM MDT
- In force
- 38 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Morgan County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 31, 9:48 PM MDT | Tornado F0 | Morgan, 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 00:00Z, 3.6 hours before the alert went out and 66 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
- 169 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1122 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- -14 m²/s²
- 0-3 km storm-relative helicity
- 160 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 010340
TORDEN
COC087-010415-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
937 PM MDT FRI MAY 31 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 1015 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
EASTERN MORGAN
INCLUDING THE FOLLOWING TOWNS/CITIES
BRUSH...FORT MORGAN AND HILLROSE
AT 937 PM MDT THE PUBLIC REPORTED FUNNEL CLOUDS
2 MILES SOUTHWEST OF BRUSH ...OR ABOUT 37 MILES SOUTHWEST OF
STERLING. NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A POSSIBLE TORNADO.
THE STORM PRODUCING THE TORNADO WAS MOVING TO THE NORTHEAST AT
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 TIL 1100 PM MDT.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
GARD...WSFO DENVER
LAT...LON 4014 10349 4013 10381 4048 10380 4048 10346What 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, May 31, 9:19 PM MDT, 18 minutes before
COZ011-010500- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 920 PM MDT FRI MAY 31 1991 ...THUNDERSTORMS IN DOUGLAS COUNTY... STRONG THUNDERSTORMS ARE DEVELOPING OVER DOUGLAS COUNTY LATE THIS EVENING. THE STRONGEST STORM WAS NORTHEAST OF PALMER LAKE OR ABOUT 40 MILES SOUTH OF DENVER AND WAS MOVING TO THE NORTH AT 25 MPH. A LINE OF THUNDERSTORMS EXTENDED FROM THIS STRONG STORM NORTH TO NEAR LITTLETON. THIS LINE TOO WAS MOVING TO THE NORTH AT ABOUT 25 MPH. HAIL...LIGHTNING...VERY HEAVY RAIN AND GUSTY WINDS ARE TO BE EXPECTED IN CENTRAL DOUGLAS COUNTY WITHIN THE NEXT 30 TO 60 MINUTES. THE SOUTHERN SECTIONS OF THE DENVER METRO AREA WILL ALSO BE AFFECTED BY THIS LINE OF STORMS BY 945 PM FRIDAY EVENING. PERSONS IN THE PATH OF THESE STORMS SHOULD BE ON THE LOOKOUT FOR RAPIDLY CHANGING WEATHER CONDITIONS AND MOVE TO SAFE SHELTER IF THREATENING WEATHER APPROACHES. ET
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 6:09 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 51 min |
| May 31, 6:12 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 48 min |
| May 31, 6:46 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 59 min |
| May 31, 7:43 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 62 min |
| May 31, 8:38 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 67 min |
| May 31, 9:06 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 39 min |
| May 31, 9:44 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 46 min |
| May 31, 10:02 PM MDT | Tornado Warning | BOU | Adams, Arapahoe, Washington | 28 min |
| May 31, 10:25 PM MDT | Tornado Warning | BOU | Logan, Morgan, Washington | 35 min |
| May 31, 10:26 PM MDT | Tornado Warning | BOU | Adams, Washington | 34 min |
| May 31, 10:38 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 52 min |
| May 31, 10:48 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 42 min |
| May 31, 11:00 PM MDT | Tornado Warning | BOU | Morgan, Washington | 45 min |
| May 31, 11:05 PM MDT | Tornado Warning | BOU | Logan, Washington | 40 min |
| May 31, 11:33 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 42 min |
| May 31, 11:49 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 26 min |
| May 31, 11:51 PM MDT | Tornado Warning | BOU | Logan | 24 min |
| Jun 1, 12:15 AM MDT | Severe Thunderstorm Warning | BOU | Washington | 30 min |
| Jun 1, 12:15 AM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Jun 1, 12:26 AM MDT | Tornado Warning | BOU | Washington | 34 min |
| Jun 1, 1:01 AM MDT | Tornado Warning | BOU | Washington | 29 min |
| Jun 1, 4:05 PM MDT | Severe Thunderstorm Warning | BOU | Denver, Jefferson | 40 min |
| Jun 1, 4:05 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 40 min |
| Jun 1, 4:36 PM MDT | Tornado Warning | BOU | Jefferson | 24 min |
| Jun 1, 4:57 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Boulder, Denver, Jefferson | 48 min |
| Jun 1, 5:20 PM MDT | Flash Flood Warning | BOU | Adams, Jefferson | 115 min |
| Jun 1, 5:33 PM MDT | Tornado Warning | BOU | Boulder, Jefferson | 27 min |
| Jun 1, 5:44 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Jefferson | 46 min |
| Jun 1, 5:44 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Weld | 46 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.