Alert archive / Colorado / Tornado Warnings in 1986

Tornado Warning 7, NWS Denver/Boulder, CO

September 18, 1986Logan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Sep 18, 1986, 6:31 PM MDT for Logan County, Weld County, Colorado. It was in force for 29 min.

The area

The counties it named.

The facts

Issued
Sep 18, 1986, 6:31 PM MDT (00:31 UTC)
Expired
Sep 18, 1986, 7:00 PM MDT
In force
29 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Logan 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.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 0.5 hours before the alert went out and 96 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 1986-09-19Temperature 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 00:00Z on 1986-09-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 113 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2795 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
113 m²/s²
0-3 km storm-relative helicity
217 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 190031 RRA
TORDEN
COC075-123-190100-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
631 PM MDT THU SEP 18 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

NORTHEAST COLORADO...EXTREME WESTERN LOGAN AND EXTREME EASTERN WELD

THIS WARNING INCLUDES THE FOLLOWING TOWNS AND CITIES... STONEHAM

AT 620 PM MDT A TORNADO WAS SIGHTED ON THE GROUND BY AIR FORCE
PERSONNEL AT A MISSLE SIGHT 5 MILES EAST OF THE TOWN OF NEW
RAYMER IN EXTREME EASTERN WELD COUNTY.

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...GULLY OR OTHER LOW SPOT.
.
IN ALL CASES...STAY AWAY FROM WINDOWS...DOORS AND OUTSIDE WALLS.
PROTECT YOUR HEAD AND FACE.  TRY TO GET UNDER SOMETHING STURDY.

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

WIESMUELLER

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 7:02 PM MDTSevere Thunderstorm WarningBOULogan, Weld58 min

Nearby

Tornado Warnings in Colorado, 1986Every tornado warning in 1986Tornadoes in 1986

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.