Alert archive / Colorado / Flash Flood Warnings in 1991

Flash Flood Warning 3, NWS Denver/Boulder, CO

June 1, 1991Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jun 1, 1991, 11:00 PM MDT for Larimer County, Colorado. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Jun 1, 1991, 11:00 PM MDT (05:00 UTC)
Expired
Jun 2, 1991, 1:00 AM MDT
In force
2 hr
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Larimer County, CO

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 5.0 hours before the alert went out and 209 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 00:00Z on 1991-06-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 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 00:00Z on 1991-06-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -342 square meters per square second.193958Sfc1 km3 km6 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
1289 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
-342 m²/s²
0-3 km storm-relative helicity
-213 m²/s²
Significant tornado parameter
0.0
Supercell composite
-4.4

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 flash flood 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 1, 9:35 PM MDT, 1 hour 25 minutes before
COZ011-012-013-014-020400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
930 PM MDT SAT JUN 1 1991

...SEVERE THUNDERSTORM WATCH FOR NORTH CENTRAL COLORADO CANCELLED...

EFFECTIVE AT 930 PM MDT THE SEVERE THUNDERSTORM WATCH FOR A LARGE
PORTION OF NORTH CENTRAL COLORADO INCLUDING THE DENVER METROPOLITAN
AREA WAS CANCELLED.  THUNDERSTORMS HAVE DECREASED IN BOTH INTENSITY AND
AREAL COVERAGE.

HOWEVER...A FLASH FLOOD WATCH REMAINS IN EFFECT TIL MIDNIGHT TONIGHT FOR
THE FRONT RANGE AND NORTHEAST PLAINS OF COLORADO INCLUDING THE GREATER
DENVER METROPOLITAN AREA.

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 2, 5:01 PM MDTTornado WarningBOUAdams, Larimer, Weld29 min
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

Flash Flood Warnings in Colorado, 1991Every flash flood 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.