Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 142, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 26, 1997, 4:55 PM MDT for Logan County, Colorado. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Aug 26, 1997, 4:55 PM MDT (22:55 UTC)
- Expired
- Aug 26, 1997, 5:45 PM MDT
- In force
- 50 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Logan County, CO
The radar
The Cheyenne radar (KCYS), 130 km from the middle of the area, began a volume at 22:57 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.9 hours before the alert went out and 108 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 262258 RRA
SVRDEN
COC075-262345-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
455 PM MDT TUE AUG 26 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 545 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
NORTHWESTERN LOGAN
AT 455 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF WESTPLAINS...OR ABOUT
17 MILES NORTHWEST OF STERLING.
THE STORM WAS MOVING NORTHEAST AT 15 MILES PER HOUR...AND WILL BE
LOCATED JUST NORTHWEST OF NORTH STERLING RESERVOIR BY 530 PM.
LARGE HAIL UP TO 1.5 INCHES IN DIAMETER 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. THE STORM WILL ALSO
PRODUCE UP TO 2 INCHES OF RAIN AND CAUSE MINOR FLOODING OF LOW LYING
AREAS.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
BARJENBRUCH
LAT...LON 4084 10316 4079 10342 4082 10350 4092 10330What 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 40 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, 1 hour 21 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, 1 hour 20 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, 58 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, 37 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, 36 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, 4:33 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 42 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.