Alert archive / Colorado / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 39, NWS Denver/Boulder, CO

August 2, 1986Morgan County, Washington County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 2, 1986, 3:00 PM MDT for Morgan County, Washington County, Colorado. It was in force for 60 min.

The area

The counties it named.

The facts

Issued
Aug 2, 1986, 3:00 PM MDT (21:00 UTC)
Expired
Aug 2, 1986, 4:00 PM MDT
In force
60 min
Issued by
NWS Denver/Boulder, CO
Area
Whole counties

Counties Morgan County, CO, Washington 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 12:00Z, 9.0 hours before the alert went out and 36 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 1986-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 828 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 12:00Z on 1986-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 square meters per square second.193958Sfc1 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
828 J/kg
Mixed-layer CIN
-69 J/kg
Mixed-layer LCL
1202 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 022100
SVRDEN
COC087-121-022200-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
300 PM MDT SAT AUG 2 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 400 PM MDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

NORTHEAST COLORADO...SOUTHERN MORGAN AND WESTERN WASHINGTON

THIS WARNING INCLUDES THE FOLLOWING TOWNS AND CITIES... WIGGINS..
HOYT AND WOODROW.

AT 250PM MDT RADAR INDICATED A SEVERE THUNDERSTORM IN MORGAN COUNTY
ABOUT 60 MILES NORTHEAST OF DENVER OR ABOUT 5 MILES SOUTHEAST OF
WIGGINS.  LARGE HAIL..LOCALLY HEAVY RAINFALL AND STRONG GUSTY WINDS
ARE POSSIBLE WITH THIS STORM.

MOVEMENT IS TO THE SOUTHEAST AT 30 MILES AN HOUR.

IF SEVERE WEATHER APPROACHES YOUR AREA..GO TO A STURDY SHELTER AWAY
FROM CREEK BEDS AND OTHER LOW AREAS PRONE TO FLOODING.  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.

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN AFFECT FOR MOST OF EASTERN
COLORADO UNTIL 900PM MDT THIS EVENING.

DULONG

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, Aug 2, 10:43 AM MDT, 4 hours 17 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE  DENVER CO
1040AM MDT SAT AUG 2 1986

  ...HIGH POTENTIAL FOR HEAVY THUNDERSTORMS IN EASTERN COLORADO...

THERE IS AGAIN A GOOD POSSIBILITY OF STRONG THUNDERSTORMS DEVELOPING
IN EASTERN COLORADO TODAY.  SOME OF THESE STORMS MAY CONTAIN LARGE
HAIL AND HEAVY RAIN BY THIS AFTERNOON.  LOCAL FLOODING OF SMALL
STREAMS STREETS AND OTHER LOW LYING AREAS IS A POSSIBILITY.  SINCE
THE STORMS ARE EXPECTED TO MOVE FAIRLY RAPIDLY HOWEVER...SERIOUS FLASH
FLOODING OVER LARGE AREAS IS NOT A GREAT THREAT.

A VERY MOIST AND UNSTABLE AIR MASS REMAINS IN PLACE OVER THE EASTERN
PLAINS OF COLORADO THIS MORNING.  THIS IN COMBINATION WITH UPSLOPE
FLOW HAS MADE THE POTENTIAL FOR INTENSE STORM DEVELOPMENT RATHER HIGH.
SCATTERED THUNDERSTORMS WILL DEVELOP IN SOME AREAS BY EARLY AFTERNOON
AND THEN MOVE ONTO THE PLAINS WHILE INTENSIFYING.  ALMOST ANY LOCATION
IN EASTERN COLORADO MAY BE THREATENED THIS AFTERNOON.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TV FOR LATER
STATEMENTS OR WARNINGS CONCERNING STORM DEVELOPMENT.
WIESMUELLER

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 2, 3:18 PM MDTSevere Thunderstorm WarningBOUArapahoe, Elbert57 min
Aug 2, 3:54 PM MDTSevere Thunderstorm WarningBOUAdams, Washington66 min
Aug 2, 4:49 PM MDTSevere Thunderstorm WarningBOUBoulder, Larimer, Weld56 min
Aug 2, 5:11 PM MDTSevere Thunderstorm WarningBOUWashington59 min
Aug 2, 5:27 PM MDTSevere Thunderstorm WarningBOUAdams, Weld63 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1986Every severe thunderstorm warning 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.