Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 143, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 26, 1997, 5:15 PM MDT for Washington County, Colorado. It was in force for 45 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, 5:15 PM MDT (23:15 UTC)
- Expired
- Aug 26, 1997, 6:00 PM MDT
- In force
- 45 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Washington County, CO
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.3 hours before the alert went out and 55 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 262315 RRA
SVRDEN
COC121-270000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
515 PM MDT TUE AUG 26 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 600 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
NORTH CENTRAL WASHINGTON
AT 513 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER NORTH CENTRAL WASHINGTON COUNTY...OR
ABOUT 11 MILES NORTH OF AKRON.
THE STORM WAS MOVING NORTHEAST AT 10 MILES PER HOUR. BY
600 PM...THIS STORM WILL BE LOCATED ABOUT 10 MILES NORTHWEST OF
BURDETT.
UP TO GOLFBALL SIZED 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 FORECA>ST
OFFICE IN DENVER.
BARJENBRUCH
LAT...LON 4032 10300 4028 10323 4036 10333 4043 10314
4043 10302What 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, 3:34 PM MDT, 1 hour 41 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 40 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, 1 hour 18 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, 57 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, 56 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
Special weather statement, Aug 26, 5:08 PM MDT, 7 minutes before
COZ041-262345- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 508 PM MDT TUE AUG 26 1997 ...STRONG THUNDERSTORM IN SOUTHEASTERN DOUGLAS COUNTY... AT 505 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES SOUTH OF LARKSPUR...OR ABOUT 38 MILES SOUTH OF DENVER. DOPPLER RADAR INDICATED RAINFALL RATES OF 1 TO 1.5 INCHES IN AN HOUR. THE STORMS MAY ALSO PRODUCE WIND GUSTS TO 50 MPH AND PEA SIZED HAIL. THE STORM WAS MOVING EAST AT 20 MILES PER HOUR. PERSONS IN OR NEAR GREENLAND AND LARKSPUR SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. DANGEROUS LIGHTNING...SMALL HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS WILL OCCUR WITH THIS STORM. HERRALD
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, 4:55 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 50 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.