Alert archive / Colorado / Tornado Warnings in 1987
Tornado Warning 16, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jul 8, 1987, 5:52 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 28 min.
The area
The counties it named.
The facts
- Issued
- Jul 8, 1987, 5:52 PM MDT (23:52 UTC)
- Expired
- Jul 8, 1987, 6:20 PM MDT
- In force
- 28 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.
The nearest sounding before it
Denver, CO (KDEN), launched 12:00Z, 11.9 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.
- Mixed-layer CAPE
- 10 J/kg
- Mixed-layer CIN
- -338 J/kg
- Mixed-layer LCL
- 1779 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 107 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 082353
TORDEN
COC001-005-090020-
BULLETIN...EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
552 PM MDT WED JUL 08 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING
EFFECTIVE UNTIL 620 PM MDT FOR PEOPLE IN THE FOLLOWING
COUNTIES OF NORTHEAST COLORADO:
CENTRAL ADAMS
CENTRAL ARAPAHOE
INCLUDING THE FOLLOWING TOWNS/CITIES:
BENNETT..BYERS..AND STRASBURG
THE STORM IS LOCATED 28 MILES EAST OF DENVER NEAR THE TOWN OF BENNETT.
STORM SPOTTERS REPORTED A POSSIBLE TORNADO ONE HALF MILE EAST OF
BENNETT.
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 NUMBER FOR INFORMATION.
E.T.
LAT..LON 3995 10458 3995 10422 3963 10422 3963 10458What 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, Jul 8, 1:40 PM MDT, 4 hours 12 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 140 PM MDT WED JUL 8 1987 A STRONG THUNDERSTORM HAS DEVELOPED RAPIDLY IN SOUTHEAST DOUGLAS COUNTY THIS AFTERNOON. AT 135 PM THE STORM WAS LOCATED ABOUT 5 MILES TO THE SOUTHEAST OF CASTLE ROCK...MOVING TO THE EAST AT AROUND 10 TO 15 MPH. THE STORM SHOULD PRODUCE HEAVY RAIN...HAIL AND STRONG GUSTY WINDS AS WELL AS LIGHTNING. THE STORM MAY EVEN BECOME SEVERE BUT WILL LIKELY BE OUT OF DOUGLAS COUNTY BY THE TIME IT DOES SO. PERSONS IN SOUTHEAST DOUGLAS COUNTY SHOULD KEEP AN EYE ON THE SKY AND BE PREPARED TO SEEK SAFE SHELTER SHOULD THREATENING WEATHER APPROACH. E.T. AFTERNOON AND EVENING IN NORTHEAST COLORADO. E.T.
Special weather statement, Jul 8, 4:08 PM MDT, 1 hour 44 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 409 PM MDT WED JUL 8 1987 A STRONG THUNDERSTORM HAS DEVELOPED 5 MILES SOUTHEAST OF BYERS IN CENTRAL ARAPAHOE COUNTY AND IS MOVING TO THE EAST AT ABOUT 10 MPH. STRONG GUSTY WINDS...HAIL...HEAVY RAIN AND LIGHTNING CAN BE EXPECTED WITH THIS STORM. PERSONS IN CENTRAL AND EASTERN ARAPAHOE COUNTY...INCLUDING THE TOWNS OF BYERS AND DEER TRAIL SHOULD BE ON THE LOOKOUT AND BE READY TO MOVE TO A PLACE OF SAFETY SHOULD THREATENING WEATHER APPROACH. WEATHER SPOTTERS REPORTED HAIL ONE HALF INCH IN DIAMETER FALLING BETWEEN BYERS AND DEER TRAIL AT 404 PM MDT. OTHER THUNDERSTORMS CONTINUE TO DEVELOP IN MANY SECTIONS OF NORTHEAST COLYORADO...BEING MOST NUMEROUS IN WASHINGTON COUNTY SOUTH OF AKRON. E.T.
Special weather statement, Jul 8, 5:13 PM MDT, 39 minutes before
SPECIAL WEATHER STATEMENT/SHORT RANGE FORECAST NATIONAL WEATHER SERVICE DENVER CO 512 PM MDT WED JUL 8 1987 STRONG THUNDERSTORMS ARE DEVELOPING IN EASTERN CLEAR CREEK COUNTY AND ARE MOVING TO THE EAST AT ABOUT 10 MPH. THESE STORMS SHOULD BEGIN AFFECTING THE DENVER METROPOLITAN AREA WITHIN THE NEXT HOUR OR TWO. STRONG GUSTY WINDS APPEAR TO BE THE MAIN EFFECT THESE STORMS WILL HAVE ON THE DENVER AREA ALTHOUGH RAIN AND HAIL ARE A POSSIBILITY AS THESE STORMS MOVE OFF THE MOUNTAINS. EARLIER THUNDERSTORMS WEST OF DENVER HAVE PRODUCED GUSTY WINDS WITH ONE GUST OF ABOUT 25 MPH CLOCKED AT THE NATIONAL WEATHER SERVICE OFFICE NEAR STAPLETON FIELD. CLOUDS ARE BEGINNING TO BUILD OVER THE EASTERN SECTIONS OF THE DENVER AREA AT THIS TIME AND SHOULD DEVELOP INTO THUNDERSTORMS WITHIN THE NEXT HOUR OR TWO. THESE STORMS...SHOULD THEY DEVELOP...MAY BE STRONGER THAN THE ONES MOVING OFF THE MOUNTAINS AND ARE MORE LIKELY TO PRODUCE HAIL AND HEAVY RAIN. IN ADDITION...THUNDERSTORMS CONTINUE TO DEVELOP AND DISSIPATE IN CENTRAL AND EASTERN ADAMS AND ARAPAHOE COUNTIES AS WELL AS SOUTHERN WASHINGTON AND SOUTHWEST YUMA COUNTIES AT THIS HOUR AND SHOULD CONTINUE TO DO SO FOR THE NEXT COUPLE OF HOURS. HAIL AS LARGE AS ONE INCH IN DIAMETER HAS OCCURRED IN OPEN COUNTRY NORTH OF DEER TRAIL WITHIN THE LAST HOUR. MORE LARGE HAIL MAY BE ANTICIPATED FROM THESE STORMS. E.T.
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.