Alert archive / Colorado / Severe Thunderstorm Warnings in 1992
Severe Thunderstorm Warning 113, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 11, 1992, 6:18 PM MDT for Washington County, Colorado. It was in force for 27 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
- Aug 11, 1992, 6:18 PM MDT (00:18 UTC)
- Expired
- Aug 11, 1992, 6:45 PM MDT
- In force
- 27 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Washington County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 11, 6:40 PM MDT | Hail 0.75 | Washington, CO | |
| Aug 11, 6:55 PM MDT | Hail 0.75 | 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, 0.3 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
- 1643 J/kg
- Mixed-layer CIN
- -19 J/kg
- Mixed-layer LCL
- 1320 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 45 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 120019
SVRDEN
COC121-120045-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
618 PM MDT TUE AUG 11 1992
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 645 PM MDT FOR PEOPLE IN
THE FOLLOWING COUNTIES
IN NORTHEASTERN COLORADO
NORTH CENTRAL WASHINGTON
INCLUDING THE FOLLOWING LOCATIONS
AKRON...MIDWAY AND PLATNER
AT 618 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
A SEVERE THUNDERSTORM 4 MILES WEST OF AKRON ...OR ABOUT 33
MILES SOUTH OF STERLING.
THE STORM WAS MOVING SOUTHEAST AT 15 MPH.
IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY
SHELTER AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS.
REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE DAMAGING
HAIL...DAMAGING WINDS OVER 60 MPH...FREQUENT DEADLY LIGHTNING...AND
VERY HEAVY RAIN.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT
AGENCYB RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
FORECAST OFFICE IN DENVER.
LAT...LON 4004 10300 4000 10342 4033 10347 4035 10328
DELGADOWhat 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 11, 2:46 PM MDT, 3 hours 32 minutes before
COZ002-004-011-112200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 245 PM MDT TUE AUG 11 1992 ...THUNDERSTORMS WITH HEAVY RAIN IN CLEAR CREEK COUNTY... A BAND OF THUNDERSTORMS WHICH DEVELOPED OVER THE CONTINENTAL DIVIDE THIS AFTERNOON HAS PRODUCED HEAVY RAINS AND SOME SMALL HAIL OVER MUCH OF CLEAR CREEK COUNTY. SOME MINOR FLOODING WAS REPORTED IN GEORGETOWN AT 240 PM. THE HEAVY RAINS HAVE ALSO CAUSED SOME ROCK AND MUDSLIDES TO OCCUR. A CAR ON WESTBOUND I-70 WAS STRUCK BY A FALLING BOULDER NEAR THE TOWN OF SILVER PLUME. THE THUNDERSTORMS ARE MOVING SOUTHEAST AT ABOUT 15 MPH...MOVING OVER THE HIGHER TERRAIN OF NORTHEAST PARK AND SOUTHWEST JEFFERSON COUNTY. MOTORISTS AND PEOPLE IN THESE AREAS SHOULD REMAIN ALERT FOR MUD AND ROCK SLIDES AS WELL AS RAPIDLY RISING STREAM LEVELS IN THIS MOUNTAINOUS TERRAIN. ADDITIONAL THUNDERSTORM ACTIVITY IS POSSIBLE THROUGH THE REST OF THE AFTERNOON. DANKERS...WSFO DENVER b
Special weather statement, Aug 11, 4:09 PM MDT, 2 hours 9 minutes before
COZ011-012-2300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 410 PM MDT TUE AUG 11 1992 ...THUNDERSTORMS IN SOUTHERN WASHINGTON AND EASTERN ARAPAHOE COUNTIES... OVER THE LAST HOUR A LINE OF STRONG THUNDERSTORMS HAS DEVELOPED OVER NORTHEAST COLORADO. THE LINE OF STORMS EXTENDED FROM NEAR COLORADO SPRINGS TO CENTRAL WASHINGTON COUNTY...NEAR ELBA. STORMS WITHIN THE LINE WERE MOVING SOUTHERLY AT ABOUT 10 MPH...BUT THE LINE ITSELF WAS NEARLY STATIONARY. AT 4 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE STRONGEST STORM WAS LOCATED JUST NORTH OF LINDON AND WEST OF ELBA IN WASHINGTON COUNTY. ANOTHER THUNDERSTORM WAS LOCATED IN EASTERN ARAPAHOE COUNTY JUST EAST OF DEER TRAIL. THESE STORMS ARE PRODUCING PERIODS OF HEAVY RAIN...WIND GUSTS UP TO 30 MPH AND POSSIBLY SMALL HAIL. MOTORISTS AND RESIDENTS SHOULD BE PREPARED FOR THE HEAVY RAINS AND NOT TRY TO CROSS WATER COVERED ROADS. DANKERS...WSFO DENVE R
Special weather statement, Aug 11, 5:58 PM MDT, 20 minutes before
COZ-012-013-120030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 600 PM MDT TUE AUG 11 1992 ...THUNDERSTORMS CONTINUE TO DEVELOP IN THE NORTHEAST PLAINS... AT 557 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTOMS MOVING THROUGH WASHINGTON COUNTY. THE STRONGER STORM WAS LOCATED ABOUT 5 MILES EAST OF HILLROSE. OTHER STORMS WERE DEVELOPING IN NORTHEASTERN WELD...MORGAN AND EASTERN ADAMS COUNTIES. THE STORMS WERE MOVING SOUTHEAST AT ABOUT 12 MPH. THESE STORMS COULD PRODUCE BRIEF HEAVY RAIN...FREQUENT DEADLY LIGHTNING...GUSTY WINDS AND POSSIBLY SOME HAIL. IF YOU ARE IN THE VICINITY OF THESE THUNDERSTORMS...GO INTO A STURDY BUILDING AND STAY AWAY FROM WINDOWS. ALSO...DO NOT USE THE PHONE OR ELECTRICAL APPLIANCES WHEN LIGHTNING IS AROUND UNLESS ABSOLUTELY NECESSARY. STAY TUNED TO NOAA WEATHER RADIO FOR LATER STATEMENTS. DELGADO
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 7:02 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 43 min |
| Aug 11, 7:48 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 42 min |
| Aug 11, 9:10 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Washington | 40 min |
| Aug 11, 10:20 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver, Douglas, Jefferson | 25 min |
| Aug 11, 10:56 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Douglas, Jefferson | 34 min |
| Aug 11, 10:56 PM MDT | Severe Thunderstorm Warning | BOU | Denver | 34 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1992Every severe thunderstorm warning in 1992
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.