Alert archive / Colorado / Tornado Warnings in 1986

Tornado Warning 2, NWS Denver/Boulder, CO

June 8, 1986Adams County, Arapahoe County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at Jun 8, 1986, 5:17 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 23 min. 2 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 8, 1986, 5:17 PM MDT (23:17 UTC)
Expired
Jun 8, 1986, 5:40 PM MDT
In force
23 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Adams County, CO, Arapahoe 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

TimeReportWhereRemark
Jun 8, 5:20 PM MDTTornado F1Adams, CO
Jun 8, 5:20 PM MDTTornado F1Adams, 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, 11.3 hours before the alert went out and 95 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 1986-06-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1986-06-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
117 J/kg
Mixed-layer CIN
-286 J/kg
Mixed-layer LCL
776 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
50 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 082317 RRA
TORDEN
COC005-082340-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED 
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
517 PM MDT SUN JUN 8 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 540 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTY OF

NORTHEAST COLORADO...WESTERN ARAPAHOE

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

AT 510 PM MDT WEATHER SERVICE PERSONNEL OBSERVED SEVERAL TORNADOES
ON THE GROUND IN AURORA.  TAKE COVER IMMEDIATELY.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING
WINDS OF OVER 60 MPH...DEADLY LIGHTNING...AND HEAVY RAINS THAT CAN
QUICKLY FLOOD A LOW LYING AREA.

THESE STORMS CAN AND OCCASIONALLY DO PRODUCE A TORNADO WITH LITTLE OR
NO ADVANCE WARNING...SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO
A PLACE OF SAFETY IF ONE IS SPOTTED.

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
CALoL YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN DENVER AT
361-0663.  DO NOT CALL THIS NUMBER FOR INFORMATION.

A TORNADO WATCH REMAINS IN AFFECT FOR MOST OF NORTHEAST COLORADO
TIL 8 PM MDT THIS SUNDAY EVENING.

THALER

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 7, 7:37 PM MDTSevere Thunderstorm WarningBOUMorgan53 min
Jun 8, 3:26 PM MDTSevere Thunderstorm WarningBOUAdams54 min
Jun 8, 4:40 PM MDTSevere Thunderstorm WarningBOUWeld65 min
Jun 8, 5:44 PM MDTTornado WarningBOUAdams26 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.