Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 39, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 18, 1991, 7:03 PM MDT for Logan County, Phillips County, Yuma County, Colorado. It was in force for 27 min.
The area
The counties it named.
The facts
- Issued
- Jun 18, 1991, 7:03 PM MDT (01:03 UTC)
- Expired
- Jun 18, 1991, 7:30 PM MDT
- In force
- 27 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Logan County, CO, Phillips County, CO, Yuma County, CO
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 1.1 hours before the alert went out and 81 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
- 691 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 2943 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 190105
TORDEN
COC075-095-121-125-190130-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
703 PM MDT TUE JUN 18 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 730 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
SOUTHEASTERN LOGAN...WESTERN PHILLIPS AND NORTHWESTERN YUMA
INCLUDING THE FOLLOWING TOWNS/CITIES
CLARKVILLE...FLEMING...HAXTUN AND PAOLI
AT 703 PM MDT THE LOGAN COUNTY SHERIFF REPORTED A TORNADO ABOUT
10 MILES EAST OF STERLING. THE TORNADO APPEARS TO BE MOVING SOUTH.
THE STORM PRODUCING THE TORNADO WAS MOVING SOUTH SOUTHEAST 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 AWAY
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 THE NORTHEAST PLAINS AND NORTHEAST
BORDER AREAS OF COLORADO UNTIL 11PM MDT.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
GCF..WSFO DENVER
LAT...LON 4032 10247 4030 10279 4075 10296 4074 10248What 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 18, 3:53 PM MDT, 3 hours 10 minutes before
COZ011-012-182250- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 350 PM MDT TUE JUN 18 1991 ...THUNDERSTORMS WITH GUSTY WINDS EAST OF DENVER... AT 350 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF THUNDERSTORMS EAST OF DENVER ACROSS PORTIONS OF CENTRAL AND WESTERN ADAMS AND ARAPAHOE COUNTIES. BRIEF STRONG WINDS AND LIGHTNING ARE THE PRIMARY THREAT WITH THESE STORMS AT THIS TIME. AT 330 PM A WIND GUST OF 46 MPH WAS RECORDED AT BRIGHTON IN NORTHWEST ADAMS COUNTY. THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS AFTERNOON OVER NORTHEASTERN COLORADO WITH THE STRONGER STORMS EXPECTED EAST OF THE DENVER AREA. MONITOR LOCAL NEWS MEDIA OR NOAA WEATHER RADIO 0FOR FUTURE STATEMENTS AND BULLETINS. END...SZOKE/GCF...WSFO DENVER
Special weather statement, Jun 18, 4:30 PM MDT, 2 hours 33 minutes before
COZ011-012-182300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 430 PM MDT TUE JUN 18 1991 ...NEW THUNDERSTORMS IN SOUTHEASTERN WELD AND WESTERN MORGAN COUNTIES... AT 430 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT NEW THUNDERSTORMS HAVE DEVELOPED IN SOUTHEASTERN WELD COUNTY FROM EAST OF KEENSBURG EASTWARD TO THE MORGAN COUNTY LINE. BRIEF STRONG WINDS...LIGHTNING...AND POSSIBLE HAIL WILL OCCUR WITH THESE STORMS. THE STORMS ARE MOVING TO THE EAST-NORTHEAST AT ABOUT 20 MPH. NEW STORMS WILL CONTINUE TO DEVELOP NEAR I-76 BETWEEN ROGGEN AND WIGGINS...AND ACROSS MUCH OF WESTERN MORGAN COUNTY. OTHER THUNDERSTORMS WITH FREQUENT LIGHTNING WERE FOUND IN SOUTHERN DOUGLAS COUNTY. ADDITIONAL THUNDERSTORM DEVELOPMENT CAN BE EXPECTED OVER NORTHEASTERN COLORADO INTO THIS EVENING AND SOME STORMS COULD BECOME STRONG...ESPECIALLY OVER THE EXTREME EASTERN PLAINS EAST OF DENVER. MONITOR LOCAL NEWS MEDIA OR NOAA WEATHER RADIO FOR FUTURE STATEMENTS AND BULLETINS. END...SZOKE/GCF...WSFO DENVER
Special weather statement, Jun 18, 5:15 PM MDT, 1 hour 48 minutes before
COZ011-012-190000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 515 PM MDT TUE JUN 18 1991 ...THUNDERSTORMS CONTINUE OVER PORTIONS OF NORTHEASTERN COLORADO... THUNDERSTORMS CONTINUED TO DEVELOP OVER PORTIONS OF THE NORTHEAST THIS EVENING. AT 515 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED TWO MAIN AREAS OF THUNDERSTORMS. ONE AREA WAS IN THE SOUTHEASTERN QUARTER OF DOUGLAS COUNTY WHILE THE OTHER AREA OF THUNDERSTORMS EXTENDED FROM SOUTHERN MORGAN COUNTY NORTHWARDS ACROSS FORT MORGAN INTO NORTHEASTERN WELD COUNTY. STRONG WINDS...LIGHTNING...AND POSSIBLE HAIL WILL ACCOMPANY THESE STORMS. ADDITIONAL THUNDERSTORMS WILL DEVELOP ACROSS PORTIONS OF NORTHEASTERN COLORADO INTO THIS EVENING AND SOME STORMS COULD BECOME STRONG...ESPECIALLY OVER THE EXTREME EASTERN PLAINS EAST OF DENVER. CONTINUE TO MONITOR LOCAL NEWS MEDIA OR NOAA WEATHER RADIO FOR FUTURE STATEMENTS AND BULLETINS. END...SZOKE/GCF...WSFO DENVER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 6:04 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 26 min |
| Jun 18, 6:29 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 31 min |
| Jun 19, 5:50 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 25 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.