Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 67, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 21, 1997, 6:02 PM MDT for Boulder County, Colorado. It was in force for 28 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, 6:02 PM MDT (00:02 UTC)
- Expired
- Jun 21, 1997, 6:30 PM MDT
- In force
- 28 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Boulder County, CO
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 0.0 hours before the alert went out and 169 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.
510
WUUS1 KDEN 220003 RRA
SVRDEN
COC013-220030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
602 PM MDT SAT JUN 21 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
EASTERN BOULDER
INCLUDING THE FOLLOWING LOCATIONS
BOULDER...LONGMONT...LAFAYETTE...LOUISVILLE...LYONS AND NIWOT
AT 549 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 2 MILES NORTHEAST OF BOULDER...OR ABOUT 24 MILES
NORTHWEST OF DENVER.
AT 549 PM MDT THE PUBLIC REPORTED A SEVERE THUNDERSTORM 2 MILES
NORTHEAST OF BOULDER...OR ABOUT 24 MILES NORTHWEST OF DENVER.
THIS STORM PRODUCED 1 INCH DIAMETER HAIL.
THE STORM WAS MOVING BNORTHEAST AT 10 MILES PER HOUR.
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 4025 10508 3996 10508 4001 10536 4027 10528What 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, 1 hour 34 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, 1 hour 32 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
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 |
| Jun 21, 8:38 PM MDT | Severe Thunderstorm Warning | BOU | Park | 52 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.