Alert archive / Colorado / Tornado Warnings in 1987
Tornado Warning 5, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 9, 1987, 4:41 PM MDT for Arapahoe County, Colorado. It was in force for 29 min.
The area
The counties it named.
The facts
- Issued
- Jun 9, 1987, 4:41 PM MDT (22:41 UTC)
- Expired
- Jun 9, 1987, 5:10 PM MDT
- In force
- 29 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Arapahoe 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, 10.7 hours before the alert went out and 98 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
- 676 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 128 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 092243
TORDEN
COC005-092310-
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
441 PM MDT TUE JUN 09 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 510 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
SOUTHWESTERN ARAPAHOE
INCLUDING THE FOLLOWING TOWNS/CITIES:
SOUTHERN HALF OF AURORA
THE STORM IS LOCATED OVER SOUTHERN AURORA
AT 440PM MDT A FUNNEL CLOUD WAS REPORTED OVER THE INTERSECTION
OF ILIFF AND BUCKLEY AVENUES IN AURORA BY AN OFF DUTY WEATHER
FORECASTER.
IN HOME...GO TO A BASEMENT OR IF NO BASEMENT IS AVAILABLE GO
TO A FULLY ENCLOSED INTERIOR ROOM ON THE LOWEST FLOOR.
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.
THIS THUNDERSTORM MAY ALSO CAUSE FLOODING DUE TO VERY HEAVY RAIN.
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.
LAT..LON 3956 10492 3969 10487 3972 10467 3956 10466What 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 9, 12:14 PM MDT, 4 hours 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1210PM MDT TUESDAY JUNE 9 1987
...HEAVY RAIN IN MORGAN COUNTY COLORADO...
RADAR SHOWS A BAND OF HEAVY SHOWERS LOCATED OVER WESTERN MORGAN COUNTY.
THIS BAND IS VERY NARROW AND IS LOCATED FROM GOODRICH AND JACKSON
RESERVOIR TO ABOUT WIGGINS COLORADO. A SPOTTER AT JACKSON LAKE REPORTED
VERY HEAVY RAIN AT NOON WITH 2 INCHES THUS FAR. THESE SHOWERS HAVE
SHOWN VERY LITTLE MOVEMENT SINCE THEY FORMED.
PERSONS IN WESTERN MORGAN COUNTY SHOULD AVOID LOW LYING AREAS AND SMALL
STREAMS AS THIS HEAVY RAIN MAY CAUSE LOCAL FLOODING. MOTORISTS ON I-76
AND OTHER ROADS SHOULD DRIVE WITH CAUTION AND AVOID UNDERPASSES AND BE
ALERT FOR FLOODING OF STREET INTERSECTIONS. ALL PERSONS IN ESSTERN
COLORADO SHOULD CONTINUE TO MONITOR LOCAL RADIO AND TV BROADCASTS OR
NOAA WEATHER RADIO FOR FUTURE STATEMENTS AND WARNINGS. A FLASH FLOOD
WATCH REMAINS POSTED FOR THE EASTERN FOOTHILLS AND ADJACENT PLAINS
BELOW 7000 FEET FOR THIS AFTERNOON AND EVENING.Special weather statement, Jun 9, 1:11 PM MDT, 3 hours 30 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
110PM MDT TUESDAY JUNE 9 1987
...LOCALLY HEAVY RAINS CONTINUE IN EASTERN COLORADO...
HEAVY THUNDERSTORMS CONTINUE IN MORGAN COUNTY WITH THE HEAVIEST STORM
AT 1PM REPORTED 10 MILES SOUTHWEST OF FORT MORGAN. LOCALLY HEAVY
SHOWERS AND THUNDERSTORMS ARE ARE DEVELOPING THROUGHOUT MUCH OF EASTERN
COLORADO AND DURING THE PAST HOUR HAVE BEGUN FORMING ALONG THE EASTERN
FOOTHILLS. THESE STORMS ARE MOVING MOSTLY TOWARD THE NORTH NORTHEAST
AT AROUND 10 TO 20 MILES PER HOUR.
THE FLASH FLOOD WATCH VALID FROM 3PM TO 9PM THIS AFTERNOON ALONG
MUCH OF THE EASTERN FOOTHILLS BELOW 7500 FEET REMAINS IN EFFECT.
STAY TUNED TO RADIO OR TV FOR FURTHER INFORMATION.
TUNNELLSpecial weather statement, Jun 9, 2:44 PM MDT, 1 hour 57 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
3PM MDT TUESDAY JUNE 9 1987
...WIDESPREAD RAIN OVER EASTERN COLORADO...
LOCALLY HEAVY SHOWERS AND THUNDERSTORMS CONTINUED OVER EASTERN
COLORADO AT 3PM WITH THE HEAVIEST STORM 3 MILES SOUTHEAST OF MERINO
IN LOGAN COUNTY. OTHER HEAVY SHOWERS WERE SPOTTED THROUGHOUT THE EASTERN
PLAINS AND WERE BEGINNING TO DEVELOP IN WESTERN JEFFERSON COUNTY. THESE
STORMS ARE MOVING MOSTLY TOWARD THE NORTH AT AROUND 15 TO 20 MILES PER
HOUR.
THE FLASH FLOOD WATCH VALID FROM 3PM TO 9PM THIS AFTERNOON ALONG
MUCH OF THE EASTERN FOOTHILLS BELOW 7500 FEET REMAINS IN EFFECT.
STAY TUNED TO RADIO OR TV FOR FURTHER INFORMATION.
TUNNELL
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 3:30 PM MDT | Severe Thunderstorm Warning | BOU | Denver | 60 min |
| Jun 9, 3:30 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas, Jefferson | 60 min |
| Jun 9, 4:11 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 29 min |
| Jun 9, 4:17 PM MDT | Tornado Warning | BOU | Arapahoe, Douglas | 28 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.