Alert archive / Colorado / Tornado Warnings in 1991

Tornado Warning 10, NWS Denver/Boulder, CO

May 24, 1991Adams County, Arapahoe County, Colorado

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

TimeReportWhereRemark
May 24, 3:19 PM MDTTornado F0Arapahoe, 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 1991-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1991-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

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 10402

What 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
COZ011-012-013-242200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
255 PM MDT FRI MAY 24 1991

...THUNDERSTORMS CONTINUE IN NORTHEAST COLORADO...

THUNDERSTORMS CONTINUE TO DEVELOP AND MOVE ACROSS NORTHEAST COLORADO.
AT 250PM MDT THE STRONGEST THUNDERSTORMS WERE IN YUMA AND PHILLIPS
COUNTY.  THESE THUNDERSTORMS WERE MOVING SLOWLY TO THE NORTH.

HEAVY RAIN...HAIL AND FREQUENT LIGHTNING ACCOMPANY THESE THUNDERSTORMS
BUT THEY ALSO HAVE THE CAPABILITY OF INTENSIFYING AND CAUSING FUNNEL
CLOUDS OR PERHAPS EVEN A TORNADO.  ALL PERSONS IN NORTHEAST COLORADO
SHOULD REMAIN ALERT AND MOVE INDOORS TO A STURDY SHELTER IF THREATENING
WEATHER IS SIGHTED.

THE SLOW MOVEMENT OF THE THUNDERSTORMS WILL ALSO INCREASE THE POTENTIAL
FOR FLOODING OF SMALL STREAMS AND STORM DRAINS AS WELL AS LOW LYING
ROADWAYS.  MOTORISTS SHOULD REDUCE SPEED AND DRIVE WITH CAUTION IF RAIN
IS ENCOUNTERED.  DO NOT TRY TO DRIVE THROUGH LOW LYING AREAS IF WATER
IS COVERING THE PAVEMENT AS THE ROAD MAY BE IMPASSABLE.  PEOPLE NEAR
SMALL STREAMS SHOULD BE PREPARED TO MOVE TO HIGHER GROUND IF WATER
LEVELS INT HE STREAM BEGINS TO RISE.  MONITOR NOAA WEATHER RADIO OR
LOCAL NEWS MEDIA FOR ADDITIONAL STATEM3ENTS.

AT 235PM MDT 2 FUNNELS WERE SPOTTED BY A HAM RADIO OPERATOR ABOUT
2 MILES SOUTHWEST OF THE TOWN OF COPE OR 50 MILES NORTHEAST OF LIMON.

END...GCF...WSFO DENVER

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 6:00 PM MDTSevere Thunderstorm WarningBOUWashington, Yuma60 min
May 23, 6:56 PM MDTSevere Thunderstorm WarningBOUYuma49 min
May 24, 12:16 PM MDTTornado WarningBOULogan, Washington29 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.