Alert archive / Colorado / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 23, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 14, 1990, 8:15 PM MDT for Washington County, Colorado. It was in force for 40 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jun 14, 1990, 8:15 PM MDT (02:15 UTC)
- Expired
- Jun 14, 1990, 8:55 PM MDT
- In force
- 40 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Washington County, CO
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 14, 8:15 PM MDT | Hail 1.75 | Washington, CO | |
| Jun 14, 8:36 PM MDT | Hail 2.75 | Washington, CO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Denver, CO (KDEN), launched 00:00Z, 2.3 hours before the alert went out and 11 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
- 962 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 2454 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 409 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 150218
SVRDEN
COC121-150255-
BULLETIN...IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
815 PM MDT THU JUN 14 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM
WARNING EFFECTIVE UNTIL 855 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES OF NORTHEAST COLORADO:
NORTHERN AND CENTRAL WASHINGTON
INCLUDING THE FOLLOWING TOWNS/CITIES:
AKRON AND OTIS
THE STORM WAS LOCATED VERY NEAR AKRON..WHICH IS 32 MILES SOUTH
OF STERLING. RADAR INDICATED THE STORM MOVING EAST AT 20 MPH.
AT 812 PM A WEATHER SPOTTER IN AKRON REPORTED MARBLE TO GOLF BALL SIZED
HAIL.
A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT TONIGHT. THIS STORM
HAS A HISTORY OF PRODUCING FUNNEL CLOUDS...AND A TORNADO IS POSSIBLE.
SO BE ON THE LOOKOUT AND BE PREPARED TO MOVE TO A PLACE
OF SAFETY IF ONE IS SPOTTED.
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.
RTG
LAT..LON 3990 10283 3991 10342 4036 10344 4037 10282What 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, Jun 14, 3:10 PM MDT, 5 hours 5 minutes before
COZ011-012-013-014-142330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 300 PM MDT THU JUN 14 1990 ...TORNADO WATCH UNTIL 10PM THIS EVENING FOR NORTHEAST COLORADO... THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WATCH FOR PARTS OF NORTHEAST COLORADO FROM THE PALMER DIVIDE NORTH TO THE WYOMING BORDER...INCLUDING MANY OF THE LARGER CITIES ALONG THE FRONT RANGE EASTWARD...BUT NOT INCLUDING THE NORTHEAST CORNER OF THE STATE. ALONG THE HEAVILY POPULATED FRONT RANGE...THE GREATEST THREAT OF SEVERE WEATHER WILL BE ON THE PLAINS...WITH A LESSER THREAT NEAR THE FOOTHILLS. EASTERN AND NORTHERN METROPOLITAN DENVER ARE INCLUDED IN THE WATCH...BUT BOULDER AND GOLDEN WILL BE WEST OF THE WATCH. STRONG WINDS ALOFT...WITH MOIST EASTERLY WINDS NEAR GROUND LEVEL WILL CONTINUE THIS AFTERNOON CREATING SOME OF THE CONDITIONS NECESSARY FOR STRONG THUNDERSTORM DEVELOPMENT. REMEMBER...A TORNADO WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS INCLUDING TORNADOES. IF TORNADOES ARE SIGHTED BY SPOTTERS OR INDICATED BY RADAR...A TORNADO WARNING WILL BE ISSUED. RTG
Special weather statement, Jun 14, 5:32 PM MDT, 2 hours 43 minutes before
COZ011-012-013-014-150200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 530 PM MDT THU JUN 14 1990 ...THUNDERSTORMS ARE DEVELOPING RAPIDLY SOUTHEAST OF GREELEY... AT 525PM NATIONAL WEATHER SERVICE RADAR SHOWED TWO THUNDERSTORMS DEVELOPING VERY RAPIDLY NEAR ROGGEN...IN SOUTHWEST WELD COUNTY. THE STORMS APPEARED TO BE MOVING TO THE NORTH. ANOTHER STORM WAS DEVELOPING 5 MILES WEST OF GREELEY. A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR WELD COUNTY...AND MUCH OF NORTHERN COLORADO UNTIL 10 PM TONIGHT. HEAVY RAIN...LARGE HAIL...AND TORNADOES ARE POSSIBLE. STORMS MAY DEVELOP VERY RAPIDLY. RESIDENTS OF NORTHEAST COLORADO SHOULD TAKE COVER IF THREATENED BY SEVERE WEATHER...AND REPORT ANY SEVERE WEATHER TO YOUR NEAREST LAW ENFORCEMENT AGENCY. RTG
Special weather statement, Jun 14, 5:35 PM MDT, 2 hours 40 minutes before
COZ011-012-013-014-150200- SPECIAL WEATHER STATEMENT...CORRECTED FOR TORNADO WATCH NATIONAL WEATHER SERVICE DENVER CO 530 PM MDT THU JUN 14 1990 ...THUNDERSTORMS ARE DEVELOPING RAPIDLY SOUTHEAST OF GREELEY... AT 525PM NATIONAL WEATHER SERVICE RADAR SHOWED TWO THUNDERSTORMS DEVELOPING VERY RAPIDLY NEAR ROGGEN...IN SOUTHWEST WELD COUNTY. THE STORMS APPEARED TO BE MOVING TO THE NORTH. ANOTHER STORM WAS DEVELOPING 5 MILES WEST OF GREELEY. A TORNADO WATCH IS IN EFFECT FOR WELD COUNTY...AND MUCH OF NORTHERN COLORADO UNTIL 10 PM TONIGHT. HEAVY RAIN...LARGE HAIL...AND TORNADOES ARE POSSIBLE. STORMS MAY DEVELOP VERY RAPIDLY. RESIDENTS OF NORTHEAST COLORADO SHOULD TAKE COVER IF THREATENED BY SEVERE WEATHER...AND REPORT ANY SEVERE WEATHER TO YOUR NEAREST LAW ENFORCEMENT AGENCY. RTG
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 6:05 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| Jun 14, 6:50 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| Jun 14, 8:50 PM MDT | Severe Thunderstorm Warning | BOU | Washington, Yuma | 40 min |
| Jun 15, 4:05 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 40 min |
| Jun 15, 5:10 PM MDT | Severe Thunderstorm Warning | BOU | Sedgwick | 20 min |
| Jun 15, 5:55 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1990Every severe thunderstorm warning in 1990
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.