Alert archive / Colorado / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 1, NWS Denver/Boulder, CO

April 25, 1994Boulder County, Jefferson County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 25, 1994, 8:18 AM MDT for Boulder County, Jefferson County, Colorado. It was in force for 27 min.

The area

The counties it named.

The facts

Issued
Apr 25, 1994, 8:18 AM MDT (14:18 UTC)
Expired
Apr 25, 1994, 8:45 AM MDT
In force
27 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Boulder County, CO, Jefferson County, CO

The nearest sounding before it

Fort Carson/Butt, CO (KFCS), launched 12:00Z, 2.3 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, Fort Carson/Butt, CO at 12:00Z on 1994-04-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Carson/Butt, CO at 12:00Z on 1994-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.19395878Sfc1 km3 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
2327 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
68 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, Apr 25, 8:05 AM MDT, 13 minutes before
COZ038-042>043-251500-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
805 AM MDT MON APR 25 1994

...THUNDERSTORMS ALONG THE FRONT RANGE...

AT 750 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
THUNDERSTORMS ALONG THE FRONT RANGE.  THE STRONGEST THUNDERSTORM WAS
NEAR BERTHOUD IN LARIMER COUNTY...OR 19 MILES SOUTH OF FORT COLLINS.
OTHER STORMS WERE IN DOUGLAS COUNTY NEAR SEDALIA...OR 20 MILES SOUTH OF
DENVER AND JUST WEST OF GOLDEN IN JEFFERSON COUNTY.  THE STORMS WERE
MOVING NORTH NORTHWEST AT 20 MPH.

WEATHER SPOTTERS AT 745 AM REPORTED PEA SIZE HAIL PARTIALLY COVERING THE
GROUND IN BERTHOUD.  PEA SIZE HAIL WAS ALSO REPORTED IN GOLDEN.

PEOPLE ALONG THE FRONT RANGE...INCLUDING FORT COLLINS...LOVELAND...
DENVER AND BOULDER SHOULD BE ALERT FOR GUSTY WINDS...SMALL HAIL AND
FREQUENT LIGHTNING.

LESZCYNSKI

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 25, 8:18 AM MDTSevere Thunderstorm WarningBOUAdams, Denver27 min
Apr 25, 8:32 AM MDTSevere Thunderstorm WarningBOULarimer, Weld28 min
Apr 25, 8:49 AM MDTSevere Thunderstorm WarningBOUAdams, Denver, Jefferson41 min
Apr 25, 8:49 AM MDTSevere Thunderstorm WarningBOUBoulder, Weld41 min
Apr 25, 9:03 AM MDTSevere Thunderstorm WarningBOULarimer, Weld42 min
Apr 25, 9:45 AM MDTSevere Thunderstorm WarningBOUWeld30 min
Apr 25, 1:47 PM MDTSevere Thunderstorm WarningBOUArapahoe, Washington43 min
Apr 25, 2:20 PM MDTTornado WarningBOUWashington25 min
Apr 25, 2:45 PM MDTSevere Thunderstorm WarningBOUWashington25 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1994Every severe thunderstorm warning in 1994

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.