Alert archive / Colorado / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 124, NWS Denver/Boulder, CO

June 22, 1991Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 22, 1991, 4:31 PM MDT for Morgan County, Weld County, Colorado. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
Jun 22, 1991, 4:31 PM MDT (22:31 UTC)
Expired
Jun 22, 1991, 5:15 PM MDT
In force
44 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Morgan County, CO, Weld County, CO

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.5 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 1991-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 299 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 1991-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 161 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
299 J/kg
Mixed-layer CIN
-102 J/kg
Mixed-layer LCL
841 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
161 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm 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 22, 1:13 PM MDT, 3 hours 18 minutes before
COZ011-012-014-015-016-222000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
110 PM MDT SAT JUN 22 1991

...TORNADO WATCH IN EFFECT FOR PORTIONS OF EASTERN COLORADO UNTIL 900 PM
MDT...

THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY HAS
ISSUED A TORNADO WATCH FOR PORTIONS OF EASTERN COLORADO UNTIL 900
PM MDT THIS AFTERNOON AND EVENING.  THIS WATCH INCLUDES THE FRONT
RANGE...PIKES PEAK/PALMER DIVIDE...NORTHEAST PLAINS...SOUTHEAST
FOOTHILLS...AND THE SOUTHEAST PLAINS.  THIS WATCH MEANS CONDITIONS ARE
FAVORABLE FOR TORNADOS AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE
WATCH AREA.

AT 110 PM NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED STRONG
THUNDERSTORMS WITH HEAVY RAIN BEGINNING TO DEVELOP OVER THE MOUNTAINS.
THE STRONGEST THUNDERSTORM  WAS LOCATED OVER SOUTHERN LARIMER COUNTY
OVER GLEN HAVEN ABOUT 10 MILES NORTHEAST OF ESTES PARK.  THE STORM WAS
MOVING NORTHEAST AT 20 TO 25 MPH.

THE EXPECTED SEVERE WEATHER TODAY IS THE RESULT OF PLENTY OF MOISTURE
AND FAVORABLE SURFACE AND UPPER ATMOSPHERIC WINDS.

PEOPLE IN PORTIONS OF EASTERN COLORADO SHOULD BE ALERT TO THE
POSSIBILITY OF TORNADOS AND SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING.  BE ON THE LOOKOUT FOR TORNADOS...3/4 INCH HAIL OR
GREATER...WINDS IN EXCESS OF 58 MPH...AND HEAVY RAIN.  CONTINUE TO STAY
ABREAST OF THE LATEST WEATHER INFORMATION. CONTINUE TO LISTEN TO NOAA
WEATHER RADIO...COMMERCIAL RADIO...OR TELEVISION FOR FURTHER STATEMENTS
OR WARNINGS.

HOLMES
Special weather statement, Jun 22, 1:54 PM MDT, 2 hours 37 minutes before
COZ011-222100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
153 PM MDT SAT JUN 22 1991

...THUNDERSTORMS DEVELOPING OVER WESTERN DENVER METRO AREA...

AT 145 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED
THUNDERSTORMS DEVELOPING OVER THE WESTERN PORTION OF THE DENVER METRO
AREA.  THE STORMS WERE MOVING NORTHEAST AT 25 MPH.

PEOPLE IN LITTLETON...COMMERCE CITY...DENVER AND BRIGHTON SHOULD BE
ALERT FOR GUSTY WINDS...BRIEF HEAVY RAIN AND HAIL UNTIL AROUND 300 PM.

CONTINUE TO MONITOR COMMERCIAL MEDIA...AS WELL AS NOAA WEATHER RADIO FOR
FURTHER STATEMENTS AND POSSIBLE WARNINGS.

A TORNADO WATCH IS IN EFFECT FOR MUCH OF EASTERN COLORADO...INCLUDING
THE DENVER METRO AREA UNTIL 9PM MDT TONIGHT.

LESZCYNSKI
Special weather statement, Jun 22, 2:07 PM MDT, 2 hours 24 minutes before
COZ011-222100-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
207 PM MDT SAT JUN 22 1991

...THUNDERSTORMS MOVING INTO DENVER...

AT 156 PM MDT MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWED
TWO THUNDERSTORMS INTENSIFYING AS THEY MOVE INTO THE DENVER METRO
AREA.  ONE THUNDERSTORM WAS LOCATED OVER ARVADA...WITH A SECOND
STORM OVER SOUTHWEST DENVER.  THESE STORMS WERE MOVING NORTHEAST
AT 10 TO 15 MPH.

A PUBLIC REPORT OF A FUNNEL CLOUD WAS REPORTED NEAR EDGEWATER AT
2 PM MDT...WITH A SECOND FUNNEL REPORTED AT 100TH AND LOWELL IN
WESTMINSTER AT 205 PM.  THE ENTIRE FRONT RANGE CONTINUES UNDER A TORNADO
WATCH UNTIL 9 PM MDT...SO RESIDENTS ALONG THE FRONT RANGE SHOULD
CLOSELY MONITOR THE WEATHER THIS AFTERNOON...AND BE PREPARED TO
TAKE COVER FROM THUNDERSTORMS.  TORNADOES AND LARGE HAIL MAY BE
POSSIBLE.

RTG

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 6:39 PM MDTSevere Thunderstorm WarningBOUJefferson21 min
Jun 21, 8:50 PM MDTSevere Thunderstorm WarningBOUAdams, Denver, Jefferson40 min
Jun 21, 9:25 PM MDTSevere Thunderstorm WarningBOUAdams, Denver25 min
Jun 21, 10:41 PM MDTSevere Thunderstorm WarningBOUDenver, Jefferson29 min
Jun 21, 11:09 PM MDTSevere Thunderstorm WarningBOUDenver26 min
Jun 21, 11:17 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe28 min
Jun 22, 1:57 PM MDTSevere Thunderstorm WarningBOULarimer, Weld33 min
Jun 22, 2:11 PM MDTSevere Thunderstorm WarningBOUBoulder, Weld34 min
Jun 22, 2:11 PM MDTSevere Thunderstorm WarningBOUAdams34 min
Jun 22, 2:36 PM MDTTornado WarningBOULarimer, Weld39 min
Jun 22, 2:45 PM MDTSevere Thunderstorm WarningBOUWeld30 min
Jun 22, 3:15 PM MDTSevere Thunderstorm WarningBOUWeld45 min
Jun 22, 3:50 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld40 min
Jun 22, 5:15 PM MDTTornado WarningBOUMorgan, Weld30 min
Jun 22, 5:47 PM MDTSevere Thunderstorm WarningBOULogan, Morgan, Weld43 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1991Every severe thunderstorm warning 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.