Alert archive / Colorado / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 7, NWS Denver/Boulder, CO

May 26, 1987Adams County, Arapahoe County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 26, 1987, 1:33 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 57 min. 1 report 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: May 26, 1987, 1:33 PM MDT (19:33 UTC)
Expired: May 26, 1987, 2:30 PM MDT
In force: 57 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

Time	Report	Where	Remark
May 26, 2:00 PM MDT	Hail 1	Adams, 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, 7.6 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-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: 10 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 1049 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: -82 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDEN 261933
SVRDEN
COC001-005-262030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
133 PM MDT TUE MAY 26 1987

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 230 PM MDT FOR PEOPLE IN THE FOLLOWING 
COUNTIES OF

NORTHEAST COLORADO...CENTRAL ADAMS AND CENTRAL ARAPAHOE

THIS WARNING INCLUDES THE FOLLOWING TOWNS AND CITIES... BENNETT..
STRASBURG..BYERS

AT 120 PM A SEVERE THUNDERSTORM WAS LOCATED NEAR BENNETT MOVING
NORTHEAST AT 15 MPH.  LARGE HAIL WAS OCCURRING IN THIS STORM.

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

DULONG

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 2:04 PM MDT	Tornado Warning	BOU	Larimer, Weld	31 min
May 26, 3:24 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	61 min

Nearby

Severe Thunderstorm Warnings in Colorado, 1987 Every severe thunderstorm warning in 1987

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.