Alert archive / Colorado / Tornado Warnings in 1987

Tornado Warning 2, NWS Denver/Boulder, CO

May 26, 1987Larimer County, Weld County, Colorado

NWS Denver/Boulder, CO issued this tornado warning at May 26, 1987, 2:04 PM MDT for Larimer County, Weld County, Colorado. It was in force for 31 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, 2:04 PM MDT (20:04 UTC)
Expired: May 26, 1987, 2:35 PM MDT
In force: 31 min
Issued by: NWS Denver/Boulder, CO
Area: Whole counties

Counties 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	Remark
May 26, 2:20 PM MDT	Hail 1	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, 8.1 hours before the alert went out and 166 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 262007
TORDEN
COC123-262035-
 
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
204 PM MDT TUE MAY 26 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 235 PM  MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
 
     EXTREME EASTERN LARIMER..NORTHWESTERN WELD
 
INCLUDING THE FOLLOWING TOWNS/CITIES:
 
     CARR..NUNN..PIERCE..AND ROCKPORT AND WELLINGTON
 
THE STORM IS LOCATED 13 MILES NORTHEAST OF FT COLLINS.
 
AT 200 PM MDT  RADAR INDICATED A POSSIBLE TORNADO NEAR WELLINGTON.
THE PUBLIC ALSO REPORTED FUNNEL CLOUDS IN THE AREA.
 
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.
 
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 NJUMBER FOR INFORMATION.
 
DULONG    
 
LAT..LON  4096 10500 4096 10470 4063 10470 4063 10501

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 1:33 PM MDT	Severe Thunderstorm Warning	BOU	Adams, Arapahoe	57 min
May 26, 3:24 PM MDT	Severe Thunderstorm Warning	BOU	Morgan	61 min

Nearby

Tornado Warnings in Colorado, 1987 Every tornado warning in 1987 Tornadoes 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.