Alert archive / Colorado / Tornado Warnings in 1987
Tornado Warning 11, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 28, 1987, 4:47 PM MDT for Arapahoe County, Washington County, Colorado. It was in force for 18 min.
The area
The counties it named.
The facts
- Issued
- Jun 28, 1987, 4:47 PM MDT (22:47 UTC)
- Expired
- Jun 28, 1987, 5:05 PM MDT
- In force
- 18 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Arapahoe 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, 10.8 hours before the alert went out and 47 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2946 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 19 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 282249
TORDEN
COC121-005-039-073-282305-
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
447 PM MDT SUN JUN 28 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 505 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
SOUTHWESTERN WASHINGTON
SOUTHEASTERN ARAPAHOE
NORTHEASTERN ELBERT
NORTHERN LINCOLN
INCLUDING THE FOLLOWING TOWNS/CITIES:
AGATE
THE STORM IS LOCATED 24 MILES NORTH OF LIMON.
AT445PM A TORNADO WAS REPORTED BY PERSONS JUST NORTH OF LIMON
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.
A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR
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 NUMBER FOR INFORMATION.
DUNN
LAT..LON 3965 10381 3967 10356 3950 10311 3930 10387What forecasters said that day
The local office's own words before this tornado 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, Jun 28, 12:10 PM MDT, 4 hours 37 minutes before
SPECIAL WEATHER STATEMENT/SHORT RANGE FORECAST NATIONAL WEATHER SERVICE DENVER CO 1207 PM MDT SAT JUN 27 1987 ....STRONG THUNDERSTORM NORTH OF FT COLLINS... AS OF 1205 PM MDT A STRONG THUNDERSTORM HAD DEVELOPED ABOUT 20 MILES NORTHEAST OF FORT COLLINS COLORADO...NEAR THE TOWN OF WARREN. THIS STORM SHOULD MOVE SOUTHEAST AND MAY BRING BRIEF HEAVY RAIN...SMALL HAIL AND STRONG GUSTY WINDS TO CARR...NUNN AND DOVER BETEWEEN NOW AND 130 PM MDT. THIS STORM IS PROBABLY THE BEGINNINGS OF A LINE OF STORMS WHICH IS EXPECTED TO DEVELOP NEAR THE WYOMING BORDER EARLY THIS AFTERNOON AND MOVE SOUTHWARD AHEAD OF A COLD FRONT. THE STORMS MAY BECOME SEVERE...ESPECIALLY ON THE NORTHEAST PLAINS. KAPLA
Local storm report, Jun 28, 2:31 PM MDT, 2 hours 16 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
225 PM MDT SUN JUN 28 1987
TIME EVENT/LOCATION
1413 NR GALETON CO...3/4 INCH HAIL, PARTLY MELTED, FROM RECENT
STORM. REPORT FROM PROFS CHASE TEAM.
KAPLANSpecial weather statement, Jun 28, 2:49 PM MDT, 1 hour 58 minutes before
SPECIAL WEATHER STATEMENT/SHORT RANGE FORECAST NATIONAL WEATHER SERVICE DENVER CO 248 PM MDT SAT JUN 27 1987 ....THUNDERSTORMS BUILDING AROUND DENVE METRO AREA.. AT 240 PM MDT CLOUDS WERE BUILDING FROM BOULDER THROUGH DENVER AND EASTWARD IN AN AREA OF CONVERGING WINDS. THESE CONVERGING WINDS SHOULD INTENSIFY AND THE CLOUDS BUILD INTO THUNDERSTORMS BY AROUND 3PM OR SHORTLY AFTER. THESE SHOWERS AND THUNDERSTORMS WILL PRODUCE STRONG WIND G
Special weather statement, Jun 28, 3:21 PM MDT, 1 hour 26 minutes before
SPECIAL WEATHER STATEMENT/SHORT RANGE FORECAST NATIONAL WEATHER SERVICE DENVER CO 320 PM MDT SUN JUN 28 1987 ....STRONG THUNDERSTORM NEAR AKRON,COLORADO.... A STRONG THUNDERSTORM WAS INDICATED ON RADAR AT 315PM VERY NEAR AKRON IN WESTERN WASHINGTON COUNTY. THIS STORM WAS MOVING VERY SLOWLY TO THE EAST. HEAVY RAIN WITH FLOODING OF LOW LYING AREAS AND SMALL HAIL ARE LIKELY IN THIS AREA. FURTHER STATEMENTS OR WARNINGS WILL BE ISSUED AS NEEDED...LPERSONS IN WASHINGTON COUNTY SHOULD STAY TUNED TO LOCAL MEDIA OR NOAA WEATHER RADIO FOR THE NEXT FEW HOURS. DUNN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 1:14 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 61 min |
| Jun 28, 3:27 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 63 min |
| Jun 28, 5:06 PM MDT | Severe Thunderstorm Warning | BOU | Washington, Yuma | 59 min |
| Jun 28, 5:06 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe | 59 min |
Nearby
Tornado Warnings in Colorado, 1987Every tornado warning in 1987Tornadoes 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; the sounding from the Mesonet's radiosonde archive.