Alert archive / Colorado / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 76, NWS Denver/Boulder, CO

July 1, 1992Adams County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 1, 1992, 6:04 PM MDT for Adams County, Weld County, Colorado. It was in force for 36 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jul 1, 1992, 6:04 PM MDT (00:04 UTC)
Expired
Jul 1, 1992, 6:40 PM MDT
In force
36 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Adams County, CO, Weld County, CO

What was reported inside it

TimeReportWhereRemark
Jul 1, 6:04 PM MDTHail 1Weld, CO

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 0.1 hours before the alert went out and 104 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 1992-07-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 620 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 00:00Z on 1992-07-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 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
620 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
1005 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
411 m²/s²
Significant tornado parameter
0.7
Supercell composite
6.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KDEN 020006
SVRDEN
COC001-123-020045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
604 PM MDT WED JUL 01 1992

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 645 PM MDT FOR PEOPLE IN
THE FOLLOWING COUNTIES

IN NORTHEASTERN COLORADO
     NORTH CENTRAL ADAMS AND SOUTH CENTRAL WELD

INCLUDING THE FOLLOWING LOCATIONS
     KEENESBURG...PROSPECT VALLEY AND ROGGEN

AT 604 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM OVER PROSPECT VALLEY ...OR ABOUT 29 MILES
SOUTHEAST OF GREELEY.

AMATEUR RADIO WEATHER SPOTTERS REPORTED ONE INCH SIZE HAIL JUST
WEST OF PROSPECT VALLEY. 

THE STORM WAS MOVING EAST AT 15 MPH.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY
SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING
HAIL...DAMAGING WINDS OVER 60 MPH...DEADLY LIGHTNING...AND VERY
HEAVY RAIN.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.

DULONG
LAT...LON 3998 10415 3996 10454 4013 10454 4021	 10424

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, Jul 1, 12:20 PM MDT, 5 hours 44 minutes before
COZ002-004-011-012-013-020000-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1140 AM MDT WED JUL 1 1992

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

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

SEVERE WEATHER IS POSSIBLE IN THE AREA...BUT SHOULD NOT DEVELOP UNTIL
LATE THIS AFTERNOON OR THIS EVENING.

A COOL AND STABLE AIRMASS HAS DROPPED INTO NORTHEAST COLORADO TODAY
BEHIND A COLD FRONT.  EAST TO NORTHEAST UPSLOPING FLOW HAS CAUSED
WIDESPREAD CLOUDINESS.   AREAS OF LIGHT RAIN AND DRIZZLE HAVE BEEN
OCCURRING...MAINLY OVER THE LOWER NORTHEAST PLAINS AND BORDER.

LOOKING TOWARDS THE WEST...A FAIRLY STRONG UPPER LEVEL SYSTEM IS
APPROACHING COLORADO FROM UTAH.  THIS SYSTEM WILL HELP SPAWN NUMEROUS
SHOWERS AND THUNDERSTORMS OVER THE HIGHER TERRAIN OF NORTHERN COLORADO
THIS AFTERNOON AND EVENING...SPECIFICALLY FROM THE NORTHEAST FOOTHILLS
AND PALMER DIVIDE WESTWARD.  A FEW OF THESE STORMS COULD APPROACH SEVERE
LEVELS...MAINLY OVER OR NEAR THE HIGHER TERRAIN OF LARIMER COUNTY
SOUTHWARD TO DOUGLAS COUNTY.  COLDER AIR WILL BE MOVING IN ALOFT...
DROPPING THE SNOW LEVEL TO 10 THOUSAND FEET.

THIS APPROACHING SYSTEM IS EXPECTED TO CHANGE THE STABLE AIRMASS OF
NORTHEAST COLORADO TO ONE FAVORING STORM DEVELOPMENT BY EARLY TONIGHT.
SHOWERS AND THUNDERSTORMS SHOULD BECOME NUMEROUS OVER THE URBAN CORRIDOR
...AND SPREAD EASTWARD TO THE KANSAS AND NEBRASKA BORDERS BY 8 PM THIS
EVENING.  SOME OF THESE STORMS COULD ALSO BE'COME SEVERE.

SPOTTER ACTIVATION COULD BE NEEDED ALONG THE URBAN CORRIDOR
LATE THIS AFTERNOON...AND COULD BE EXPANDED TO THE NORTHEAST
PLAINS/BORDER REGION THIS EVENING.

DULONG
Special weather statement, Jul 1, 5:06 PM MDT, 58 minutes before
COZ011-012-020000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
510 PM MDT WED JUL 01 1992

...STRONG THUNDERSTORM SOUTHEAST OF PLATTEVILLE...

AT 5 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG
AND RAPIDLY DEVELOPING THUNDERSTORM SOUTHEAST OF PLATTEVILLE OR ABOUT 30
MILES SOUTHEAST OF FORT COLLINS.  THE STORM WAS MOVING TO THE EAST AT
ABOUT 10 MPH.

HAIL...STRONG WINDS AND VERY HEAVY RAIN WILL ACCOMPANY THIS STORM AS IT
MOVES ACROSS SOUTH CENTRAL WELD COUNTY NORTH OF HUDSON OVER THE NEXT 30
MINUTES.

MOVE TO A PLACE OF SAFETY IF THREATENING WEATHER APPROACHES.

ET

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 6:35 PM MDTSevere Thunderstorm WarningBOUWeld20 min
Jul 1, 6:35 PM MDTSevere Thunderstorm WarningBOUMorgan40 min
Jul 1, 7:03 PM MDTTornado WarningBOUWashington42 min
Jul 1, 7:39 PM MDTTornado WarningBOUWashington51 min
Jul 1, 8:24 PM MDTSevere Thunderstorm WarningBOUYuma51 min
Jul 1, 9:13 PM MDTSevere Thunderstorm WarningBOUYuma47 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1992Every severe thunderstorm warning in 1992

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.