Alert archive / Colorado / Tornado Warnings in 1991

Tornado Warning 29, NWS Denver/Boulder, CO

June 2, 1991Adams County, Larimer County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 2, 1991, 5:01 PM MDT for Adams County, Larimer County, Weld County, Colorado. It was in force for 29 min.

The area

The counties it named.

The facts

Issued
Jun 2, 1991, 5:01 PM MDT (23:01 UTC)
Expired
Jun 2, 1991, 5:30 PM MDT
In force
29 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Adams County, CO, Larimer County, CO, Weld County, CO

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 11.0 hours before the alert went out and 139 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 1991-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 110 joules per kilogram.LCLLFCEL10008507005003002001001 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 1991-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 square meters per square second.1939587897Sfc1 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
110 J/kg
Mixed-layer CIN
-53 J/kg
Mixed-layer LCL
832 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
104 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 022303
TORDEN
COC069-123-022330-

BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
501 PM MDT SUN JUN 02 1991

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 530 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

IN NORTH CENTRAL COLORADO
     SOUTHEASTERN LARIMER

IN NORTHEASTERN COLORADO
     SOUTHWESTERN WELD

INCLUDING THE FOLLOWING TOWNS/CITIES
     GILCREST...GREELEY...LOVELAND...MILLIKEN AND PLATTEVILLE

AT 501 PM MDT A WELD COUNTY SHERIFF REPORTED A TORNADO ON THE GROUND
NEAR MILLIKEN ...OR ABOUT 14 MILES SOUTHWEST OF GREELEY

THE STORM PRODUCING THE TORNADO WAS MOVING TO THE NORTH ABOUT 30 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 MUCH OF NORTHEAST
AND NORTH CENTRAL COLORADO UNTIL 8PM MDT.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.

GCF...DENVER

LAT...LON 4022 10481 4022 10494 4048 10507 4041 10475
1 follow-up statement
000 
TTAA00 KDEN 022305 RRA
TORDEN
COC001-031-022330-

BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
501 PM MDT SUN JUN 02 1991

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A TORNADO
WARNING EFFECTIVE UNTIL 530 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

IN NORTHEASTERN COLORADO
     WESTERN ADAMS...AND NORTHERN DENVER

INCLUDING THE FOLLOWING TOWNS/CITIES
     AURORA...COMMERCE CITY...NORTHEAST DENVER...
     

AT 501 PM MDT THE NATIONAL WEATHER SERVICE OBSERVED REPORTED FUNNEL
CLOUDS 3 MILES NORTH OF STAPLETON IN THE CITY OF COMMERCE CITY ...OR
ABOUT 5 MILES NORTH OF DENVER
THE STORM PRODUCING THE TORNADO WAS MOVING TO THE NORTHWEST AT 25 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.


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 3975 10485 3975 10496 4000 10512 4001 10483

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, Jun 2, 3:47 PM MDT, 1 hour 14 minutes before
COZ011-012-013-014-020400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
345PM MDT   SUNDAY   JUNE 2 1991

...THUNDERSTORMS INCREASING OVER COLORADO...

THUNDERSTORMS ARE INCREASING IN NUMBER OVER NORTHEASTERN COLORADO.
A SEVERE THUNDERSTORM WATCH IS POSTED FOR A LARGE PART OF NORTHEAST
AND PART OF NORTH CENTRAL COLORADO UNTIL 8PM MDT.  A FLASH FLOOD
WATCH IS ALSO IN EFFECT FOR THE FRONT RANGE AND NORTHEAST PLAINS OF
COLORADO UNTIL MIDNIGHT FOR RIVERS AND STREAMS BELOW 8000 FEET.
A FLOOD WARNING IS POSTED FOR THE SOUTH PLATTE RIVER BETWEEN GREELEY
TO JUST NORTH OF FORT LUPTON UNTIL MONDAY MORNING.

AT 345PM MDT THERE WERE SEVERAL WEAK TO MODERATE THUNDERSTORMS IN
WELD AND CENTRAL ADAMS COUNTIES.  THERE WERE ALSO SOME STRONG
THUNDERSTORMS IN NORTHWEST BOULDER COUNTY.  THUNDERSTORMS WERE ALSO
SPREADING NORTH FROM SOUTHEAST COLORADO INTO ELBERT COUNTY.  THESE
THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAIN...UP TO 2 INCHES IN
AN HOUR OR LESS...HAIL AND FREQUENT LIGHTNING.  THE THUNDERSTORMS WERE
MOVING TO THE NORTH NORTHWEST AT 25-30 MPH.

ALL PERSONS IN NORTHEAST COLORADO SHOULD MONITOR NOAA WEATHER RADIO OR
LOCAL NEWS MEDIA FOR ADDITIONAL STATEMENTS AND WARNINGS.  BE ALERT AND
BE PREPARED TO MOVE TO A PLACE OF SHELTER IF THREATENING WEATHER IS IN
YOUR AREA.  PEOPLE NEAR STREAMS AND RIVERS SHOULD BE READY TO MOVE TO
HIGHER GROUND IF HEAVY RAIN IS OBSERVED OR IF WATER LEVELS BEGIN TO
RISE.  MANY STREAMS AND CREEKS IN AND NEAR THE FRONT RANGE FOOTHILLS
AND NEARBY PLAINS ARE RUNNING QUITE HIGH ALREADY.  ANY HEAVY RAINFALL
WILL BE ENOUGH TO MAKE THEM OVERFLOW THEIR BANKS IN SOME AREAS.  HEAVY
RAIN IN AN URBAN AREA WILL CAUSE FLOODING OF STREETS ESPECJIALLY IN LOW
LYING AREAS AND AT INTERSECTIONS.

END...GCF...WSFO DENVER
Special weather statement, Jun 2, 4:01 PM MDT, 1 hour before
COZ012-022300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
400 PM MDT SUN JUNE 2 1991

...STRONG THUNDERSTORM OVER NORTHEAST COLORADO...

AT 350 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM IN NORTHERN WELD COUNTY 9 MILES SOUTH OF KEOTA
OR 50 MILES EAST OF FORT COLLINS.  THIS STROM WAS MOVING TO THE
NORTHWEST AT 25 MPH.

ALL PERSONS IN NORTHERN WELD COUNTY INCLUDING THE TOWNS OF GROVER...
BRIGGSDALE AND HEREFORD SHOULD BE ALERT FRO FREQUENT DANGEROUS
LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THIS STORM TIL 500 PM
MDT THIS AFTERNOON.  HEAVY RAIN MAY CAUSE LOCAL FLOODING OF
HIGHWAYS...DITCHES...SMALL STREAMS AND LOW LYING OR FLOOD PROlNE AREAS.

GARD...WSFO DENVER
Special weather statement, Jun 2, 4:24 PM MDT, 37 minutes before
COZ011-022330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
425 PM MDT SUN JUNE 2 1991

...STRONG THUNDERSTORMS MAY DEVELOP OVER SOUTHERN METRO AREA...

AT 415 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THAT STRONG THUNDERSTORMS COULD DEVELOP RAPIDLY OVER THE SOUTHERN
PORTION OF THE DENVER METRO AREA FROM NEAR PARKER WEST TO LITTLETON.
SHOULD STORMS DEVELOP THEY WILL MOVE TO THE NORTHWEST AT 25 MPH ACROSS
CENTRAL DENVER.

ALL PEOPLE IN THE SOUTHERN PORTION OF THE DENVER METRO AREA SHOULD BE
ALERT FOR FREQUENT DANGEROUS LIGHTNING...HAIL AND STRONG GUSTY WINDS
FROM THESE STORMS TIL 530 PM MDT THIS AFTERNOON.  HEAVY RAIN MAY CAUSE
LOCAL FLOODING OF STREETS...DITCHES...SMALL STREAMS AND LOW LYING OR
FLOOD PRONE AREAS.

GARD...WSFO DENVER
Special weather statement, Jun 2, 4:38 PM MDT, 23 minutes before
COZ011-022330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
440 PM MDT SUN JUNE 2 1991

...STRONG THUNDERSTORMS OVER SOUTHEAST METRO DENVER...

AT 435 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS OVER SOUTHEAST METRO DENVER IN THE VICNITY OF
SOUTH AURORA AND SOUTHEAST DENVER.  THESE STROMS WERE MOVING TO
THE NORTHWEST AT 25 MPH.

ALL PEOPLE IN THE DENVER METRO AREA SHOULD BE ALERT FOR FREQUENT
DANGEROUS LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THESE STORMS TIL
530 PM MDT THIS AFTERNOON.  HEAVY RAIN MAY CAUSE LOCAL FLOODING OF
STREETS...DITCHES...SMALL STREAMS AND LOW LYING OR FLOOD PRONE AREAS.

GARD...WSFO DENVER
Special weather statement, Jun 2, 4:44 PM MDT, 17 minutes before
COZ011-022330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
445PM MDT SUN JUNE 2 1991

...HEAVY RAIN AND STRONG THUNDERSTORM NEAR MEAD COLORADO...

AT 445 PM MDT RADAR INDICATED A STRONG NEAR HARNEY COLORADO.  THIS
THUNDERSTORM WAS DUMPING 1 TO 2 INCHES OF RAIN PER HOUR IN THE TOWN
OF MEAD ACCORDING TO REPORTS FROM AHAM RADIO OPERATOR.  THE
THUNDERSTORM IS MOVING TO THE NORTH NORTHWEST ABOUT 30 MPH.

PEOPLE IN WESTERN WELD AND SOUTHEASTERN LARIMER COUNTY SHOULD BE ALERT
FOR THIS STORM AND MOVE INDOORS IF THREATENING WEATHER APPROACHES.
MOTORISTS ALONG AND NEAR I-25 BETWEEN 40 AND 60 MILES NORTH OF DENVER
SHOULD WATCH FOR HEAVY RAIN.  THIS THUNDERSTORM COULD CAUSE FLOODING
OF STREETS AND LOW LYING AREAS.

IF YOU ARE NEAR A CREEK OR STREAM IN SOUTHWEST WELD OR SOUTHEAST
LARIMER COUNTY MOVE TO HIGHER GROUND IF HEAVY RAIN REACHES YOUR
LOCATION AS STREAMS ARE LIKELY TO OVERFLOW IN THIS AREA.

END...GCF...WSFO DENVER
Special weather statement, Jun 2, 4:47 PM MDT, 14 minutes before
COZ011-022330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
450 PM MDT SUN JUNE 2 1991

...STRONG THUNDERSTORMS OVER SOUTHEAST METRO DENVER...

AT 445 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG
THUNDERSTORM INTENSIFYING OVER THE EAST METRO DENVER IN THE VICNITY OF
AURORA.  THIS STORM MAY CONTAIN HAIL.  THIS STORM WAS MOVING TO THE
NORTHWEST AT 25 MPH.

ALL PEOPLE IN THE DENVER METRO AREA SHOULD BE ALERT FOR FREQUENT
DANGEROUS LIGHTNING...HAIL AND STRONG GUSTY WINDS FROM THIS STORM TIL
530 PM MDT THIS AFTERNOON.  HEAVY RAIN MAY CAUSE LOCAL FLOODING OF
STREETS...DITCHES...SMALL STREAMS AND LOW LYING OR FLOOD PRONE AREAS.

GARD...WSFO DENVER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 6:07 PM MDTTornado WarningBOUBoulder38 min
Jun 1, 6:33 PM MDTTornado WarningBOULarimer27 min
Jun 1, 8:02 PM MDTFlash Flood WarningBOULarimer3 hr
Jun 1, 11:00 PM MDTFlash Flood WarningBOULarimer2 hr
Jun 2, 5:01 PM MDTTornado WarningBOUDenver29 min
Jun 2, 5:27 PM MDTSevere Thunderstorm WarningBOUAdams, Boulder, Denver, Jefferson48 min
Jun 2, 5:27 PM MDTSevere Thunderstorm WarningBOUWeld48 min
Jun 2, 5:41 PM MDTSevere Thunderstorm WarningBOUAdams, Morgan, Washington64 min
Jun 2, 5:45 PM MDTFlash Flood WarningBOUDenver75 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.