Alert archive / Colorado / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 39, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 2, 1986, 3:00 PM MDT for Morgan County, Washington County, Colorado. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Aug 2, 1986, 3:00 PM MDT (21:00 UTC)
- Expired
- Aug 2, 1986, 4:00 PM MDT
- In force
- 60 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Morgan 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, 9.0 hours before the alert went out and 36 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
- 828 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 1202 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 58 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDEN 022100 SVRDEN COC087-121-022200- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 300 PM MDT SAT AUG 2 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 400 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHEAST COLORADO...SOUTHERN MORGAN AND WESTERN WASHINGTON THIS WARNING INCLUDES THE FOLLOWING TOWNS AND CITIES... WIGGINS.. HOYT AND WOODROW. AT 250PM MDT RADAR INDICATED A SEVERE THUNDERSTORM IN MORGAN COUNTY ABOUT 60 MILES NORTHEAST OF DENVER OR ABOUT 5 MILES SOUTHEAST OF WIGGINS. LARGE HAIL..LOCALLY HEAVY RAINFALL AND STRONG GUSTY WINDS ARE POSSIBLE WITH THIS STORM. MOVEMENT IS TO THE SOUTHEAST AT 30 MILES AN HOUR. IF SEVERE WEATHER APPROACHES YOUR AREA..GO TO A STURDY SHELTER AWAY FROM CREEK BEDS AND OTHER LOW AREAS PRONE TO FLOODING. 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 REPORTS 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. A SEVERE THUNDERSTORM WATCH REMAINS IN AFFECT FOR MOST OF EASTERN COLORADO UNTIL 900PM MDT THIS EVENING. DULONG
What forecasters said that day
The local office's own words before this severe thunderstorm 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, Aug 2, 10:43 AM MDT, 4 hours 17 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1040AM MDT SAT AUG 2 1986 ...HIGH POTENTIAL FOR HEAVY THUNDERSTORMS IN EASTERN COLORADO... THERE IS AGAIN A GOOD POSSIBILITY OF STRONG THUNDERSTORMS DEVELOPING IN EASTERN COLORADO TODAY. SOME OF THESE STORMS MAY CONTAIN LARGE HAIL AND HEAVY RAIN BY THIS AFTERNOON. LOCAL FLOODING OF SMALL STREAMS STREETS AND OTHER LOW LYING AREAS IS A POSSIBILITY. SINCE THE STORMS ARE EXPECTED TO MOVE FAIRLY RAPIDLY HOWEVER...SERIOUS FLASH FLOODING OVER LARGE AREAS IS NOT A GREAT THREAT. A VERY MOIST AND UNSTABLE AIR MASS REMAINS IN PLACE OVER THE EASTERN PLAINS OF COLORADO THIS MORNING. THIS IN COMBINATION WITH UPSLOPE FLOW HAS MADE THE POTENTIAL FOR INTENSE STORM DEVELOPMENT RATHER HIGH. SCATTERED THUNDERSTORMS WILL DEVELOP IN SOME AREAS BY EARLY AFTERNOON AND THEN MOVE ONTO THE PLAINS WHILE INTENSIFYING. ALMOST ANY LOCATION IN EASTERN COLORADO MAY BE THREATENED THIS AFTERNOON. STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TV FOR LATER STATEMENTS OR WARNINGS CONCERNING STORM DEVELOPMENT. WIESMUELLER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 3:18 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Elbert | 57 min |
| Aug 2, 3:54 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Washington | 66 min |
| Aug 2, 4:49 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer, Weld | 56 min |
| Aug 2, 5:11 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 59 min |
| Aug 2, 5:27 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 63 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1986Every severe thunderstorm warning in 1986
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.