Alert archive / Colorado / Tornado Warnings in 1991
Tornado Warning 10, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at May 24, 1991, 3:19 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 26 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 24, 1991, 3:19 PM MDT (21:19 UTC)
- Expired
- May 24, 1991, 3:45 PM MDT
- In force
- 26 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Adams County, CO, Arapahoe County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 24, 3:19 PM MDT | Tornado F0 | Arapahoe, 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, 9.3 hours before the alert went out and 95 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
- 1303 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 75 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 242122
TORDEN
COC001-005-242145-
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
319 PM MDT FRI MAY 24 1991
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 345 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES
IN NORTHEASTERN COLORADO
SOUTHEASTERN ADAMS AND NORTH CENTRAL ARAPAHOE
THIS INCLUDES THE TOWNS OF BYERS...PEORIA AND DEER TRAIL.
AT 319 PM MDT THE ARAPAHOE COUNTY SHERIFF REPORTED A TORNADO
ON THE GROUND NORTH OF THE TOWN OF PEORIA...NORTH OF I-70 BETWEEN
THE TOWN OF PEORIA AND DEER TRAIL. THIS IS ABOUT 40 MILES
NORTHWEST OF LIMON. THERE HAS ALSO BEEN A REPORT OF TORNADO
JUST NORTHEAST OF THE TOWN OF BYERS.
THE STORM PRODUCING THE TORNADO WAS MOVING VERY SLOWLY TO THE SOUTHEAST.
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 THE FAR EASTERN PLAINS
OF COLORADO UNTIL 7PM MDT.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAWt ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
GCF...WSFO DENVER
LAT...LON 3967 10397 3970 10417 3982 10416 3982 10402What 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 24, 1:16 PM MDT, 2 hours 3 minutes before
COZ011-242000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 115 PM MDT THU MAY 23 1991 ...HAIL PRODUCING THUNDERSTORM IN NORTHEAST DOUGLAS COUNTY... AT 115 PM...NATIONAL WEATHER SERVICE RADAR INDICATED A NEARLY STATIONARY THUNDERSTORM IN NORTHEASTERN DOUGLAS OR ABOUT 25 MILES SOUTH SOUTHEAST OF DENVER. AT 100 PM THIS STORM HAS PRODUCED PEA SIZE AND SMALLER HAIL WHICH COVERED THE GROUND AT THE PINERY SOUTH OF PARKER. HEAVY RAIN WAS ALSO REPORTED BY THE COLORADO STATE PATROL EAST OF CASTLE ROCK ON I-25. DANGEROUS LIGHTNING...SMALL HAIL...GUSTY WINDS AND HEAVY RAINS WILL CONTINUE TO ACCOMPANY THIS STORM FOR THE NEXT 45 MINUTES. SOME FLOODING OF STREETS AND LOW LYING AREAbS COULD ALSO RESULT WITH THESE STORMS. DRIVERS SHOULD EXERCISE CAUTION WHEN DRIVING THROUGH HEAVY RAIN OR AREAS WHERE HEAVY RAIN RECENTLY OCCURRED. WOLF
Special weather statement, May 24, 1:19 PM MDT, 2 hours before
COZ011-242000- SPECIAL WEATHER STATEMENT...CORRECTION FOR HEADER DATE NATIONAL WEATHER SERVICE DENVER CO 115 PM MDT FRI MAY 24 1991 ...HAIL PRODUCING THUNDERSTORM IN NORTHEAST DOUGLAS COUNTY... AT 115 PM...NATIONAL WEATHER SERVICE RADAR INDICATED A NEARLY STATIONARY THUNDERSTORM IN NORTHEASTERN DOUGLAS OR ABOUT 25 MILES SOUTH SOUTHEAST OF DENVER. AT 100 PM THIS STORM HAS PRODUCED PEA SIZE AND SMALLER HAIL WHICH COVERED THE GROUND AT THE PINERY SOUTH OF PARKER. HEAVY RAIN WAS ALSO REPORTED BY THE COLORADO STATE PATROL EAST OF CASTLE ROCK ON I-25. DANGEROUS LIGHTNING...SMALL HAIL...GUSTY WINDS AND HEAVY RAINS WILL CONTINUE TO ACCOMPANY THIS STORM FOR THE NEXT 45 MINUTES. SOME FLOODIdNG OF STREETS AND LOW LYING AREAS COULD ALSO RESULT WITH THESE STORMS. DRIVERS SHOULD EXERCISE CAUTION WHEN DRIVING THROUGH HEAVY RAIN OR AREAS WHERE HEAVY RAIN RECENTLY OCCURRED. WOLF
Special weather statement, May 24, 2:11 PM MDT, 1 hour 8 minutes before
COZ011-012-242200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 210 PM MDT FRI MAY 24 1991 ...THUNDERSTORMS DEVELOPING IN SOUTHEAST WASHINGTON COUNTY... AT 200 PM MDT...NATIONAL WEATHER SERVICE RADAR SHOWED THUNDERSTORMS DEVELOPING IN SOUTHEAST WASHINGTON COUNTY...NEAR THE CITY OF COPE OR ABOUT 60 MILES SOUTH OF STERLING. THE STORMS WERE MOVING NORTH AT 20 MPH AND WILL BE MOVING INTO CENTRAL WASHINGTON COUNTY BY 3PM. THERE WERE SEVERAL PUBLIC REPORTS OF FUNNEL CLOUDS IN THE VICINTY OF COPE SINCE 130 PM. HAIL...FREQUENT LIGHTNING AND HEAVY RAIN ARE POSSIBLE WITH THESE STORMS. PERSONS IN WASHINGTON COUNTY SHOULD BE ALERT FOR DEVELOPING THUNDERSTORMS...AND BE PREPARED TO MOVE TO A PLACE OF SAFETY IF THREATENING WEATHER APPROACHES. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR PORTIONS OF EASTERN COLORADO UNTIL 7PM MDT TONIGHT. LESZCYNSKI
Special weather statement, May 24, 2:54 PM MDT, 25 minutes before
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
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 6:00 PM MDT | Severe Thunderstorm Warning | BOU | Washington, Yuma | 60 min |
| May 23, 6:56 PM MDT | Severe Thunderstorm Warning | BOU | Yuma | 49 min |
| May 24, 12:16 PM MDT | Tornado Warning | BOU | Logan, Washington | 29 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.