Alert archive / Colorado / Tornado Warnings in 1990

Tornado Warning 2, NWS Denver/Boulder, CO

June 1, 1990Boulder County, Larimer County, Weld County, Colorado

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

The radar

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

What was reported inside it

Time	Report	Where
Jun 1, 5:02 PM MDT	Thunderstorm Wind 50	Weld, CO
Jun 1, 5:26 PM MDT	Thunderstorm Wind 71	Weld, CO
Jun 1, 5:36 PM MDT	Thunderstorm Wind 52	Weld, CO
Jun 1, 5:48 PM MDT	Thunderstorm Wind 52	Weld, 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 12:00Z, 11.0 hours before the alert went out and 169 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3029 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 96 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.

Issued	Product	Office	Counties	Lasted
Jun 1, 4:58 PM MDT	Tornado Warning	BOU	Adams, Jefferson	47 min
Jun 1, 5:50 PM MDT	Tornado Warning	BOU	Adams, Weld	45 min

Nearby

Tornado Warnings in Colorado, 1990 Every tornado warning in 1990 Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.