Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 141, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 26, 1997, 4:33 PM MDT for Washington County, Colorado. It was in force for 42 min. 1 report 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 26, 1997, 4:33 PM MDT (22:33 UTC)
- Expired
- Aug 26, 1997, 5:15 PM MDT
- In force
- 42 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Washington County, CO
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 26, 5:15 PM MDT | Hail 2 | Akron, 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.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.6 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
- 6 J/kg
- Mixed-layer CIN
- -296 J/kg
- Mixed-layer LCL
- 2325 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -57 m²/s²
- 0-3 km storm-relative helicity
- -28 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 262233 RRA
SVRDEN
COC121-262315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
433 PM MDT TUE AUG 26 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
NORTHWESTERN WASHINGTON
INCLUDING THE FOLLOWING LOCATIONS
PREWITT RESERVOIR
AT 431 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 13 MILES SOUTH OF PREWITT RESERVOIR...OR ABOUT 12
MILES NORTHWEST OF AKRON.
THE STORM WAS MOVING NORTHEAST AT 15 MILES PER HOUR AND WILL BE
MOVING TO PREWITT RESERVOIR BETWEEN 500 AND 515 PM.
VERY LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE
IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A
SUBSTANTIAL SHELTER.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
BARJENBRUCHWhat 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 26, 11:15 AM MDT, 5 hours 18 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT TUE AUG 26 1997 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: AN UPPER LEVEL DISTURBANCE WILL MOVE ACROSS THE MOUNTAINS THIS AFTERNOON AND ACROSS THE WYOMING BORDER THIS EVENING. PLENTY OF MOISTURE AND DAYTIME HEATING WILL GIVE FUEL FOR THUNDERSTORMS TODAY. THE STRONGER STORMS WILL OCCUR MAINLY NORTH OF I-76 AND PRODUCE LOCALLY HEAVY RAIN. A FEW STORMS MAY REACH SEVERE LIMITS BUT SPOTTER ACTIVATION IS NOT ANTICIPATED. TA
Special weather statement, Aug 26, 3:34 PM MDT, 59 minutes before
COZ036-040-262210- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 335 PM MDT TUE AUG 26 1997 ...STRONG THUNDERSTORM IN CENTRAL JEFFERSON COUNTY... AT 335 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM PRODUCING HEAVY RAINFALL IN CENTRAL JEFFERSON COUNTY. THE STORM WAS MOVING EAST AT 15 MILES PER HOUR. RADAR ESTIMATED RAINFALL RATES OF 1 TO 1.5 INCHES PER HOUR. THIS STORM WAS ALSO CAPABLE OF PRODUCING WIND GUSTS TO 45 MPH. PERSONS IN OR NEAR ASPEN PARK...BUFFALO CREEK...CHATFIELD RESERVOIR...CONIFER...INDIAN HILLS...MORRISON...PINE...ROXBOROUGH PARK...SOUTH PLATTE AND TINY TOWN SHOULD BE ON THE LOOKOUT FOR THESE HEAVY RAINS AND STRONG WINDS. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. RJK
Special weather statement, Aug 26, 3:35 PM MDT, 58 minutes before
COZ036-040-262210- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 335 PM MDT TUE AUG 26 1997 ...STRONG THUNDERSTORM IN CENTRAL JEFFERSON COUNTY... AT 335 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM PRODUCING HEAVY RAINFALL IN CENTRAL JEFFERSON COUNTY. THE STORM WAS MOVING EAST AT 15 MILES PER HOUR. RADAR ESTIMATED RAINFALL RATES OF 1 TO 1.5 INCHES PER HOUR. THIS STORM WAS ALSO CAPABLE OF PRODUCING WIND GUSTS TO 45 MPH. PERSONS IN OR NEAR ASPEN PARK...BUFFALO CREEK...CHATFIELD RESERVOIR...CONIFER...INDIAN HILLS...MORRISON...PINE...ROXBOROUGH PARK...SOUTH PLATTE AND TINY TOWN SHOULD BE ON THE LOOKOUT FOR THESE HEAVY RAINS AND STRONG WINDS. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. RJK
Special weather statement, Aug 26, 3:57 PM MDT, 36 minutes before
COZ042-048-262300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 357 PM MDT TUE AUG 26 1997 ...STRONG THUNDERSTORM IN NORTHEASTERN WELD COUNTY... AT 355 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 14 MILES SOUTHWEST OF WESTPLAINS...OR ABOUT 30 MILES WEST OF STERLING. THE STORM WAS MOVING NORTHEAST AT 15 MILES PER HOUR...AND WILL PRODUCE DANGEROUS LIGHTNING...MARBLE SIZED HAIL...AND BETWEEN 1 AND 2 INCHES OF RAIN IN 30 MINUTES. PERSONS IN EXTREME NORTHEAST WELD COUNTY AND EXTREME NORTHWEST LOGAN COUNTY...INCLUDING THE TOWN OF WESTPLAINS...SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER. MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. BARJENBRUCH
Special weather statement, Aug 26, 4:18 PM MDT, 15 minutes before
COZ036-040-041-262300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER COLORADO 418 PM MDT TUE AUG 26 1997 ...STRONG THUNDERSTORMS PUSHING EAST ACROSS DOUGLAS COUNTY... AT 418 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER SEDALIA...OR ABOUT 23 MILES SOUTH OF DENVER. THE STORM WAS MOVING EAST AT 25 MILES PER HOUR. RADAR ESTIMATED RAINFALL RATES OF 1 TO 1.5 INCHES PER HOUR. THIS STORM WAS ALSO CAPABLE OF PRODUCING WIND GUSTS TO 45 MPH AS WELL AS HAIL UP TO 1/2 INCH IN DIAMETER. PERSONS IN OR NEAR SOUTHERN ENGLEWOOD...LITTLETON...BEVERLY HILLS... CASTLE ROCK...DEVILS HEAD...ELIZABETH...FRANKTOWN...HIGHLANDS RANCH...LARKSPUR...LOUVIERS...PARKER...PERRY PARK...PONDEROSA PARK... ROXBOROUGH PARK...SEDALIA...SURREY RIDGE AND THE PINERY SHOULD BE ON THE LOOKOUT FOR HEAVY RAINS...SMALL HAIL...AND STRONG WIND GUSTS. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. RJK
Special weather statement, Aug 26, 4:19 PM MDT, 14 minutes before
COZ036-040-041-262300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER COLORADO 418 PM MDT TUE AUG 26 1997 ...STRONG THUNDERSTORMS PUSHING EAST ACROSS DOUGLAS COUNTY... AT 418 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER SEDALIA...OR ABOUT 23 MILES SOUTH OF DENVER. THE STORM WAS MOVING EAST AT 25 MILES PER HOUR. RADAR ESTIMATED RAINFALL RATES OF 1 TO 1.5 INCHES PER HOUR. THIS STORM WAS ALSO CAPABLE OF PRODUCING WIND GUSTS TO 45 MPH AS WELL AS HAIL UP TO 1/2 INCH IN DIAMETER. PERSONS IN OR NEAR SOUTHERN ENGLEWOOD...LITTLETON...BEVERLY HILLS... CASTLE ROCK...DEVIL'S HEAD...ELIZABETH...FRANKTOWN...HIGHLANDS RANCH...LARKSPUR...LOUVIERS...PARKER...PERRY PARK...PONDEROSA PARK... ROXBOROUGH PARK...SEDALIA...SURREY RIDGE AND THE PINERY SHOULD BE ON THE LOOKOUT FOR HEAVY RAINS...SMALL HAIL...AND STRONG WIND GUSTS. HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 4:55 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 50 min |
| Aug 26, 5:15 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 45 min |
| Aug 26, 5:58 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 47 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1997Every severe thunderstorm warning in 1997
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.