Alert archive / Colorado / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 46, NWS Denver/Boulder, CO

May 31, 1991Douglas County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 31, 1991, 4:20 PM MDT for Douglas County, Colorado. It was in force for 40 min.

The area

The counties it named.

The facts

Issued
May 31, 1991, 4:20 PM MDT (22:20 UTC)
Expired
May 31, 1991, 5:00 PM MDT
In force
40 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

County Douglas County, CO

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 10.3 hours before the alert went out and 158 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 1991-05-31Temperature 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 1991-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -33 square meters per square second.19395878Sfc1 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
1512 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-33 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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, May 31, 3:06 PM MDT, 1 hour 14 minutes before
COZ011-312200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
305 PM MDT THU MAY 30 1991

     ...THUNDERSTORMS DEVELOPING IN SOUTHERN METRO DENVER AREA...

THUNDERSTORMS WERE DEVELOPING IN NORTHERN DOUGLASS AND WESTERN ARAPAHOE
COUNTIES THIS AFTERNOON.  AT 300 PM MDT...NATIONAL WEATHER SERVICE
DOPPLER RADAR INDICATED A COUPLE OF THUNDERSTORMS NEAR SOUTHERN AURORA
AND ALSO JUST SOUTH OF LITTLETON.  THE STORMS WERE MOVING NORTH
NORTHEAST AT ABOUT 20 MILES AN HOUR.

THESE STORMS COULD PRODUCE HAIL...GUSTY WIND AND BRIEF HEAVY RAIN.
MINOR STREET FLOODING IS ALSO POSSIBLE.  RESIDENTS OF THE METRO DENVER
AREA SHOULD MONITOR WEATHER CONDITIONS AND BE PREPARED TO TAKE THE
NECESSARY SAFETY PRECAUTIONS SHOULD THREATENING WEATHER APPROACH.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION FOR
LATER STATEMENTS AND POSSIBLE WARNINGS.

DELGADO...WSFO DENVER

The office that day

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

IssuedProductOfficeCountiesLasted
May 31, 3:29 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver31 min
May 31, 3:29 PM MDTSevere Thunderstorm WarningBOUDouglas31 min
May 31, 3:56 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver34 min
May 31, 4:20 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe, Denver40 min
May 31, 4:30 PM MDTSevere Thunderstorm WarningBOUAdams, Arapahoe45 min
May 31, 4:56 PM MDTSevere Thunderstorm WarningBOUArapahoe, Douglas49 min
May 31, 5:14 PM MDTSevere Thunderstorm WarningBOUAdams46 min
May 31, 5:45 PM MDTSevere Thunderstorm WarningBOUArapahoe60 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.