Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 22, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 31, 1991, 11:51 PM MDT for Logan County, Colorado. It was in force for 24 min.
The area
The counties it named.
The facts
- Issued
- May 31, 1991, 11:51 PM MDT (05:51 UTC)
- Expired
- Jun 1, 1991, 12:15 AM MDT
- In force
- 24 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Logan County, CO
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 5.9 hours before the alert went out and 96 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 010552
TORDEN
COC075-010615-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
1151 PM MDT FRI MAY 31 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 1215 AM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
SOUTHWESTERN LOGAN
INCLUDING THE FOLLOWING TOWNS/CITIES
ATWOOD...MERINO AND STERLING
AT 1151 PM MDT RADAR INDICATED A POSSIBLE TORNADO 2 MILES NORTHEAST OF
MERINO ...OR ABOUT 11 MILES SOUTHWEST OF STERLING.
THE STORM PRODUCING THE TORNADO WAS MOVING NORTHEAST AT ABOUT 10 MILES
AN HOUR.
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 NORTHEASTERN COLORADO
UNTIL 300 AM MDT.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
DELGADO
LAT...LON 4052 10311 4044 10337 4057 10346 4071 10327What 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, 2 hours 32 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
Local storm report, May 31, 10:05 PM MDT, 1 hour 46 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1004 PM MDT FRI MAY 31 1991
PRELIMINARY STORM REPORTS FOR FRIDAY MAY 31 1991
TIME (MDT) COUNTY/LOCATION EVENT
1505 WELD/5 1/2 MI WNW WELLINGTON PEA SIZE HAIL
1532 DOUGLAS/LINCOLN & I25 GOLF BALL SIZE HAIL
1536 ARAPAHOE/ENGLEWOOD 3/4 INCH DIAMETER HAIL
1544 ARAPAHOE/I25 & COUNTY HEAVY RAIN REPORTED BY HAM
LINE ROAD "PROBABALY EXCEEDING 2 INCHES
PER HOUR"
1547 ARAPAHOE/I25 & ORCHARD ROAD 1 INCH DIAMETER HAIL
1549 ARAPAHOE/I25 & ORCHARD ROAD 3/4 INCH DIAMETER HAIL
1550 ARAPAHOE/ILIFF & I225 3/4 INCH HAIL
1554 ARAPAHOE/ALAMEDA & BUCKLEY PEA TO MARBLE SIZE HAIL
1555 ARAPAHOE/CENTRAL AURORA PEA TO MARBLE SIZE HAIL
1558 ARAPAHOE/MISSISSIPPI & PEA TO MARBLE SIZE HAIL
BUCKLEY 1 INCH DEEP
1604 ARAPAHOE/ILIFF & TELURIDE 1 INCH DIAMETER HAIL
1604 ARAPAHOE/MISSISSIPPI & 1/2 INCH DIAMETER HAIL
TOWER
1606 ARAPAHOE/CHERRY CREEK LAKE 1/2 INCH DIAMETER HAIL
1624 ARAPAHOE/DRY CREEK & 1 INCH DIAMETER HAIL
YOSEMITE
1628 ARAPAHOE/BUCKLEY NATIONAL NATIONAL GUARD REPORTED FUNNEL
GUARD BASE SOUTH WEST OF BUCKLEY
1637 ARAPAHOE/DRY CREEK & 3/4 INCH HAIL .38 INCHES OF RAIN
YOSEMITE IN 20 MINUTES
1640 DOUGLAS/CASTLEROCK 1/2 INCH DIAMETER HAIL
1645 ADAMS/WATKINS 1 INCH DIAMETER HAIL
1659 DOUGLAS/3 MILES SOUTH EAST MARBLE TO 1 INCH DIAMETER HAIL
OF PARKER
1700 DOUGLAS/5 MILES EAST SOUTH 1 INCH DIAMETER HAIL
EAST OF PARKER
1700 DOUGLAS/3 MILES SOUTH EAST MARBLE SIZE HAIL
OF PARKER
1706 DOUGLAS/2 MILES NORTH EAST MARBLE SIZE HAIL
OF PARKER
1743 ELBERT/HIGHWY 86 MARBLE SIZE HAIL
1753 ELBERT/PARKER HIGHLAND 1 INCH DIAMETER HAIL
ESTATES
1801 ELBERT/2 MILES SOUTH OF GOLF BALL SIZE HAIL
RAPAHOE COUNTY LINE
1807 JEFFERSON/NORTH WEST CORNER 1/2 TO 3/4 INCH HAIL
OF ROCKY FLATS
1808 ARAPAHOE/10 MILES SOUTH MARBLE SIZE HAIL 2 INCHES DEEP
WEST OF BYERS
1812 BOULDER/28TH & DIAGONAL HEAVY RAIN GREATER THAN 1 INCH
PER HOUR WITH SOME STREET
FLOODING
1843 ADAMS/3 MILES WEST OF BENNETT HEAVY RAIN GREATER THAN 1 INCH
PER HOUR
1847 JEFFERSON/58TH & RALSTON ROAD MARBLE SIZE HAIL
1849 ELBERT/ELIZABETH 1 INCH DIAMETER HAIL 1 1/2
INCH ES DEEP
1908 ADAMS/BENNETT MARBLE SIZE HAIL
1919 DOUGLAS/2 MILES NORTH EAST MARBLE SIZE HAIL
OF PARKER
1921 ELBERT/KIOWA MARBLE SIZE HAIL
SIMMONSSpecial weather statement, May 31, 10:11 PM MDT, 1 hour 40 minutes before
COZ011-010600- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1015 PM MDT FRI MAY 31 1991 ...THUNDERSTORMS IN DENVER AREA... AT 1010 PM MDT FRIDAY EVENING STRONG THUNDERSTORMS CONTINUED TO DEVELOP OVER THE DENVER METRO AREA. HAIL...VERY HEAVY RAIN...LIGHTNING AND GUSTY WINDS WILL ACCOMPANY THESE STORMS AS THEY MOVE THROUGH THE DENVER AREA OVER THE NEXT HOUR OR TWO. THE RAIN AND HAIL ASSOCIATED WITH THESE STORMS WILL BE SUFFICIENT TO FLOOD LOW LYING AREAS...UNDERPASSES...INTERSECTIONS AND SMALL CREEKS AND STREAMS. PERSONS IN THE DENVER AREA SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO SAFE SHELTER IF BAD WEATHER APPROACHES. AVOID DRIVING THROUGH S)TANDING WATER. 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, 9:37 PM MDT | Tornado Warning | BOU | Morgan | 38 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 |
| 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; the sounding from the Mesonet's radiosonde archive.