Alert archive / Colorado / Tornado Warnings in 1990

Tornado Warning 3, NWS Denver/Boulder, CO

June 1, 1990Adams County, Jefferson County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 1, 1990, 4:58 PM MDT for Adams County, Jefferson County, Colorado. It was in force for 47 min.

The area

The counties it named.

The facts

Issued
Jun 1, 1990, 4:58 PM MDT (22:58 UTC)
Expired
Jun 1, 1990, 5:45 PM MDT
In force
47 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Adams County, CO, Jefferson County, CO

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Fort Carson/Butt, CO (KFCS), launched 12:00Z, 11.0 hours before the alert went out and 117 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 1990-06-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 joules per kilogram.LCLLFCEL10008507005003002001001 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, Fort Carson/Butt, CO at 12:00Z on 1990-06-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 50 square meters per square second.19395878Sfc1 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
6 J/kg
Mixed-layer CIN
-170 J/kg
Mixed-layer LCL
1792 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
50 m²/s²
0-3 km storm-relative helicity
171 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 012307
TORDEN
COC059-001-013-123-069-012345-

BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
458 PM MDT FRI JUN 01 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 545 PM  MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:

     WESTERN ADAMS
     EASTERN BOULDER
     SOUTHWESTERN WELD

INCLUDING THE FOLLOWING TOWNS/CITIES:

     BRIGHTON..BROOMFIELD..DACONO..ERIE..FIRESTONE..FREDERICK..
     FT LUPTON..LAFAYETTE..LONGMONT..LOUISVILLE..LYONS..MEAD..
     NIWOT..NORTHGLENN..PLATTEVILLE..SUPERIOR..AND THORNTON

AT 405 PM MDT SPOTTERS REPORTED A FUNNEL CLOUD IN EXTREME NORTHWEST
ADAMS COUNTY AND SOUTHWEST WELD COUNTY BETWEEN BRIGHTON AND FT LUPTON.
MOVEMENT WAS TOWARDS THE EAST 15 TO 20 MPH.  BRIGHTON..FT LUPTON AND
HUDSON MAY BE AFFECTED DURING NEXT 30 MINUTES.

IN HOMES GO TO THE BASEMENT OR INTO A CLOSET OR BATHROOM.
IN SCHOOLS..HIGH RISES AND HOSPITALS GO TO AN INTERIOR
HALLWAY ON THE LOWEST FLOOR.  IF IN MOBILE HOMES OR VEHICLES..
EVACUATE THEM AND GO TO A SUBSTANTIAL SHELTER.  IF NO SHELTER
IS AVAILABLE..LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT.
IN ALL CASES..STAY AWAY FROM WINDOWS..DOORS AND OUTSIDE WALLS.

A TORNADO WATCH REMAINS IN EFFECT FOR EXTREME NORTHEAST COLORADO.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE OFFICE
IN DENVER..OR CALL YOUR REPORT TO THE NATIONAL WEATHER SERVICE
AT 361-0663.  DO NOT CALL THIS NUMBER FOR INFORMATION.

DULONG

LAT..LON  3981 10471 3992 10526 4027 10527 4027 10470

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 1, 4:58 PM MDTTornado WarningBOUBoulder, Larimer, Weld47 min
Jun 1, 5:50 PM MDTTornado WarningBOUAdams, Weld45 min

Nearby

Tornado Warnings in Colorado, 1990Every tornado warning in 1990Tornadoes in 1990

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.