Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 71, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 21, 1997, 8:38 PM MDT for Park County, Colorado. It was in force for 52 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
- Jun 21, 1997, 8:38 PM MDT (02:38 UTC)
- Expired
- Jun 21, 1997, 9:30 PM MDT
- In force
- 52 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Park County, CO
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 2.6 hours before the alert went out and 223 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
- 687 J/kg
- Mixed-layer CIN
- -122 J/kg
- Mixed-layer LCL
- 2509 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 135 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.2
The text
As transmitted, in the capitals the NWS used until 2016.
529
WUUS1 KDEN 220239 RRA
SVRDEN
COC093-220330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
838 PM MDT SAT JUN 21 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 930 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN CENTRAL COLORADO
NORTHERN PARK
INCLUDING THE FOLLOWING LOCATIONS
COMO...GRANT...JEFFERSON...KENOSHA PASS AND RED HILL PASS
AT 830 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 3 MILES SOUTHEAST OF RED HILL PASS...OR ABOUT 61
MILES SOUTHWEST OF DENVER.
THE STORM WAS MOVING NORTHEAST AT 10 TO 15 MILES PER HOUR.
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...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
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.
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.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
GARD...WSFO DENVER
LAT...LON 3931 10545 3915 10595 3928 10606 3951 10574What 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 21, 4:28 PM MDT, 4 hours 10 minutes before
COZ036-040-041-212330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 428 PM MDT SAT JUN 21 1997 ...THUNDERSTORMS PRODUCING LOCALLY HEAVY RAIN OVER HIGHER TERRAIN IN NORTHEASTERN PARK...SOUTHERN JEFFERSON AND WESTERN DOUGLAS COUNTIES... AT 420 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS OVER NORTHEAST PARK...SOUTHERN JEFFERSON... WESTERN DOUGLAS COUNTIES. THE STRONGEST THUNDERSTORM WAS 6 MILES SOUTHEAST OF BUFFALO CREEK...OR ABOUT 32 MILES SOUTHWEST OF DENVER. THESE STORMS WERE MOVING SOUTHEAST AT 20 MILES AN HOUR. DOPPLER RADAR HAS ESTIMATED FROM 0.25 TO 0.50 INCH OF RAIN IN THE PAST HOUR FROM THUNDERSTORMS MOVING ACROSS SOUTHERN JEFFERSON COUNTY. POOLING OF WATER ON ROADWAYS AND MINOR RISES IN WATER LEVELS IN DITCHES AND SMALL CREEKS MAY OCCUR. PERSONS IN OR NEAR BUFFALO CREEK...CHEESMAN RESERVOIR...DECKERS... DEVILS HEAD...HARRIS PARK...PINE...SHAWNEE...SOUTH PLATTE... SPRUCEWOOD AND WELLINGTON LAKE SHOULD BE ON THE LOOKOUT FOR THUNDERSTORMS THE NEXT COUPLE OF HOURS CAPABLE OF LOCALLY HEAVY RAIN...STRONG GUSTY WINDS AND DEADLY LIGHTNING. BE PREPARED TO MOVE TO A PLACE OF SAFETY IF THREATENING WEATHER APPROACHES. BAKER
Special weather statement, Jun 21, 4:30 PM MDT, 4 hours 8 minutes before
COZ036-040-041-212330- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 428 PM MDT SAT JUN 21 1997 ...THUNDERSTORMS PRODUCING LOCALLY HEAVY RAIN OVER HIGHER TERRAIN IN NORTHEASTERN PARK...SOUTHERN JEFFERSON AND WESTERN DOUGLAS COUNTIES... AT 420 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS OVER NORTHEAST PARK...SOUTHERN JEFFERSON... WESTERN DOUGLAS COUNTIES. THE STRONGEST THUNDERSTORM WAS 6 MILES SOUTHEAST OF BUFFALO CREEK...OR ABOUT 32 MILES SOUTHWEST OF DENVER. THESE STORMS WERE MOVING SOUTHEAST AT 20 MILES AN HOUR. DOPPLER RADAR HAS ESTIMATED FROM 0.25 TO 0.50 INCH OF RAIN IN THE PAST HOUR FROM THUNDERSTORMS MOVING ACROSS SOUTHERN JEFFERSON COUNTY. POOLING OF WATER ON ROADWAYS AND MINOR RISES IN WATER LEVELS IN DITCHES AND SMALL CREEKS MAY OCCUR. PERSONS IN OR NEAR BUFFALO CREEK...CHEESMAN RESERVOIR...DECKERS... DEVIL'S HEAD...HARRIS PARK...PINE...SHAWNEE...SOUTH PLATTE... SPRUCEWOOD AND WELLINGTON LAKE SHOULD BE ON THE LOOKOUT FOR THUNDERSTORMS THE NEXT COUPLE OF HOURS CAPABLE OF LOCALLY HEAVY RAIN...STRONG GUSTY WINDS AND DEADLY LIGHTNING. BE PREPARED TO MOVE TO A PLACE OF SAFETY IF THREATENING WEATHER APPROACHES. BAKER
Special weather statement, Jun 21, 7:50 PM MDT, 48 minutes before
COZ034-036-037-220235-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
750 PM MDT SAT JUN 21 1997
...STRONG THUNDERSTORMS MOVING INTO WESTERN PARK COUNTY...
AT 745 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE
OF THUNDERSTORMS MOVING OFF THE MOSQUITO MOUNTAIN RANGE INTO WESTERN
PARK COUNTY IN CENTRAL COLORADO. THE STRONGEST STORM ON RADAR WAS
DETECTED 3 MILES WEST OF FAIRPLAY...OR ABOUT 69 MILES SOUTHWEST OF
DENVER.
THESE STORMS WERE MOVING EAST AT 10 MILES PER HOUR. THESE STORMS ARE
EXPECTED TO MOVE OUT OVER OPEN RANGELAND IN SOUTH PARK WHERE THEY WILL
WEAKEN OR DISSIPATE BY 10 PM MDT.
PERSONS IN OR NEAR ALMA...COMO...FAIRPLAY...GRANT...JEFFERSON...
KENOSHA PASS...RED HILL PASS...TARRYALL RESERVOIR AND WILKERSON PASS
SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE
OF SAFETY IF BAD WEATHER APPROACHES.
DANGEROUS LIGHTNING...HAIL...BRIEF HEAVY RAIN...AND STRONG GUSTY WINDS
MAY OCCUR WITH THESE STORM.
IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE
INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
BAKERSpecial weather statement, Jun 21, 7:51 PM MDT, 47 minutes before
COZ034-036-037-220235-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
750 PM MDT SAT JUN 21 1997
...STRONG THUNDERSTORMS MOVING INTO WESTERN PARK COUNTY...
AT 745 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE
OF THUNDERSTORMS MOVING OFF THE MOSQUITO MOUNTAIN RANGE INTO WESTERN
PARK COUNTY IN CENTRAL COLORADO. THE STRONGEST STORM ON RADAR WAS
DETECTED 3 MILES WEST OF FAIRPLAY...OR ABOUT 69 MILES SOUTHWEST OF
DENVER.
THESE STORMS WERE MOVING EAST AT 10 MILES PER HOUR. THESE STORMS ARE
EXPECTED TO MOVE OUT OVER OPEN RANGELAND IN SOUTH PARK WHERE THEY WILL
WEAKEN OR DISSIPATE BY 10 PM MDT.
PERSONS IN OR NEAR ALMA...COMO...FAIRPLAY...GRANT...JEFFERSON...
KENOSHA PASS...RED HILL PASS...TARRYALL RESERVOIR AND WILKERSON PASS
SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE
OF SAFETY IF BAD WEATHER APPROACHES.
DANGEROUS LIGHTNING...HAIL...BRIEF HEAVY RAIN...AND STRONG GUSTY WINDS
MAY OCCUR WITH THESE STORM.
IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE
INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID
USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY
ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
BAKERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 21, 6:02 PM MDT | Severe Thunderstorm Warning | BOU | Boulder | 28 min |
| Jun 21, 6:34 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 41 min |
| Jun 21, 6:37 PM MDT | Severe Thunderstorm Warning | BOU | Park | 33 min |
| Jun 21, 7:14 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 46 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.