Alert archive / Colorado / Severe Thunderstorm Warnings in 1986
Severe Thunderstorm Warning 33, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 31, 1986, 6:19 PM MDT for Washington County, Yuma County, Colorado. It was in force for 56 min.
The area
The counties it named.
The facts
- Issued
- Jul 31, 1986, 6:19 PM MDT (00:19 UTC)
- Expired
- Jul 31, 1986, 7:15 PM MDT
- In force
- 56 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Washington County, CO, Yuma 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 00:00Z, 0.3 hours before the alert went out and 38 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
- 855 J/kg
- Mixed-layer CIN
- -78 J/kg
- Mixed-layer LCL
- 2151 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 3 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDEN 010019 SVRDEN COC121-125-010115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DENVER CO 619 PM MDT THU JUL 31 1986 THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 715 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF NORTHEAST COLORADO...EAST CENTRAL WASHINGTON AND WEST CENTRAL YUMA THIS WARNING INCLUDES THE FOLLOWING TOWNS AND CITIES... YUMA AT 610 PM MDT RADAR INDICATED A SEVERE THUNDERSTORM 8 MILES SOUTH- EAST OF AKRON MOVING TOWARD THE SOUTHEAST AT 10 MPH. 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 NATI[ONAL 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. GOODMAN
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, Jul 31, 2:43 PM MDT, 3 hours 36 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 240PM MDT THUR JUL 31 1986 ...STRONG THUNDERSTORMS DEVELOPING OVER NORTHEASTERN COLORADO.... AT 230PM MDT THIS AFTERNOON RADAR INDICATED A CLUSTER OF STRONG THUNDERSTORMS 30 MILES SOUTH SOUTHEAST OF STERLING COLORADO OR ABOUT 12 MILES EAST OF ARKON COLORADO. THESE STORMS WERE MOVING TO THE EAST AT 5 MILES PER HOUR AND COULD PRODUCE LOCALLY HEAVY RAINFALL...STRONG LIGHTNING AND SURBFACE WINDS. AT THE CURRENT SPEED...THE TOWNS OF YUMA AND CLARKVILLE IN EASTERN WASHINGTON COUNTY COLORADO WILL BE AFFECTED IN THE NEXT HOUR. HECKMAN
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 8:49 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 71 min |
| Jul 31, 9:54 PM MDT | Severe Thunderstorm Warning | BOU | Park | 66 min |
| Jul 31, 10:01 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 59 min |
| Jul 31, 11:00 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 60 min |
| Aug 1, 7:06 AM MDT | Severe Thunderstorm Warning | BOU | Washington | 69 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.