Alert archive / Colorado / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 8, NWS Denver/Boulder, CO

April 25, 1994Arapahoe County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Apr 25, 1994, 1:47 PM MDT for Arapahoe County, Washington County, Colorado. It was in force for 43 min.

The area

The counties it named.

The facts

Issued
Apr 25, 1994, 1:47 PM MDT (19:47 UTC)
Expired
Apr 25, 1994, 2:30 PM MDT
In force
43 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Arapahoe County, CO, Washington County, CO

The radar

The Denver radar (KFTG), 66 km from the middle of the area, began a volume at 19:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Denver, CO (KDEN), launched 12:00Z, 7.8 hours before the alert went out and 47 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 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 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 1994-04-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1386 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
67 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, 5 hours 42 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
Special weather statement, Apr 25, 10:47 AM MDT, 3 hours before
COZALL-251730-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1045 AM MDT MON APR 25 1994

...EARLY SEASON THUNDERSTORMS IN NORTHEAST COLORADO...

ALL SEVERE THUNDERSTORM WARNINGS HAVE EXPIRED BUT LIGHT TO MODERATE
INTENSITY THUNDERSTORMS CONTINUE TO RUMBLE ALONG THE FRONT RANGE AND
ADJACENT PLAINS THIS MORNING.  THESE THUNDERSTORMS WILL PRODUCE LOCALLY
HEAVY RAIN AND SMALL HAIL THROUGH MIDDAY AND POSSIBLY THROUGH THE
AFTERNOON.  SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE
REST OF NORTHEAST COLORADO AS THE DAY PROGRESSES.

LOCALLY HEAVY RAIN FROM SOME OF THE THUNDERSTORMS COULD CAUSE LOCAL
FLOODING OF STREETS...UNDERPASSES AND LOW LYING AREAS.  SMALL STREAMS...
CREEKS AND CANALS MAY HAVE WATER LEVELS RISE TO NEAR BANKFULL STAGE.
THE AREA MOST PRONE TO HEAVY RAIN WILL BE THE FOOTHILLS AND THE PLAINS
AREAS BETWEEN THE FOOTHILLS AND I-25.

ALL PERSONS IN NORTHEAST COLORADO AND THE FRONT RANGE FOOTHILLS EAST OF
THE CONTINENTAL DIVIDE SHOULD STAY ABREAST OF THE LATEST WEATHER
FORECASTS AND BE ALERT FOR LATER WEATHER BULLETINS.

BOODA
Special weather statement, Apr 25, 11:57 AM MDT, 1 hour 50 minutes before
COZ015-030>045-048>050-260700-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1200 PM MDT MON APR 25 1994

THIS UPDATED OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS          DENVER     JACKSON      LOGAN       SEDGWICK
ARAPAHOE       DOUGLAS    JEFFERSON    MORGAN      SUMMIT
BOULDER        GILPIN     LARIMER      PARK        WASHINGTON
CLEAR CREEK    GRAND      LAKE         PHILLIPS    WELD

...SNOW ADVISORY MOUNTAINS AND FRONT RANGE FOOTHILLS NORTH OF
   DENVER THIS AFTERNOON...

AN EARLY SPRING STORM WILL SPREAD PRECIPITATION ACROSS NORTHEAST AND
NORTH CENTRAL COLORADO THIS AFTERNOON AND EVENING.

OVER THE MOUNTAINS AND FRONT RANGE FOOTHILLS NORTH OF DENVER ADDITIONAL
SNOW ACCUMULATIONS OF 4 TO 7 INCHES ARE POSSIBLE THIS AFTERNOON.  LESSER
AMOUNTS OF SNOW ARE POSSIBLE IN THE FOOTHILLS SOUTHWEST OF DENVER.
LIGHT SNOW WILL CONTINUE THROUGH THE EVENING HOURS WITH SOME ADDITIONAL
ACCUMULATIONS.

OVER THE NORTHEASTERN HIGH PLAINS LOW LEVEL UPSLOPE FLOW HAS DEVELOPED
WITH EMBEDDED SHOWERS AND THUNDERSTORMS.  A FEW OF THESE THUNDERSTORMS
MAY BE SEVERE WITH LARGE HAIL AND STRONG GUSTY WINDS THIS AFTERNOON AND
EARLY EVENING.  LOCALLY HEAVY RAIN OF UP TO AN INCH IS POSSIBLE FROM
THESE THUNDERSTORMS.  SHOWERS AND THUNDERSTORMS WILL DECREASE DURING THE
LATE EVENING HOURS WITH OCCASIONAL RAIN BECOMING MIXED WITH SNOW NEAR
THE FOOTHILLS.

GARD...WSFO DENVER

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 25, 8:18 AM MDTSevere Thunderstorm WarningBOUBoulder, Jefferson27 min
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, 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; radar from the NEXRAD Level II archive.