Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 64, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 18, 1997, 4:41 PM MDT for Logan County, Weld County, Colorado. It was in force for 34 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 18, 1997, 4:41 PM MDT (22:41 UTC)
- Expired
- Jun 18, 1997, 5:15 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Logan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 108 km from the middle of the area, began a volume at 22:45 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 18, 3:15 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.7 hours before the alert went out and 109 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2353 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 86 m²/s²
- 0-3 km storm-relative helicity
- 100 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 182243 RRA
SVRDEN
COC075-123-182315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
441 PM MDT WED JUN 18 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
NORTHEASTERN WELD AND NORTHWESTERN LOGAN
INCLUDING THE FOLLOWING LOCATIONS
WESTPLAINS
AT 432 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 22 MILES WEST OF WESTPLAINS...OR ABOUT 43 MILES
NORTHWEST OF STERLING.
AT 425 PM MDT A SPOTTER IN NORTHEAST WELD COUNTY REPORTED WIND GUSTS
TO 60 MPH AS THE THUNDERSTORM APPROACHED FROM THE WEST.
WIND GUSTS TO 60 MPH AND HAIL UP TO 1 INCH WILL BE POSSIBLE IN
NORTHEAST WELD AND NORTHWEST LOGAN COUNTIES WITH THIS STORM UNTIL
5 PM.
THE STORM WAS MOVING EAST AT 30 MILES PER HOUR.
A TORNADO WATCH REMAINS IN EFFECT FOR MOST OF NORTHEASTERN COLORADO
UNTIL 9 PM MDT.
REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN DENVER.
DANKERS
LAT...LON 4069 10335 4070 10392 4100 10405 4097 10335
&What 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 18, 11:02 AM MDT, 5 hours 39 minutes before
COZ030-032>050-190600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1105 AM MDT WED JUN 18 1997 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO
Special weather statement, Jun 18, 11:05 AM MDT, 5 hours 36 minutes before
COZ030-032>050-190600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1105 AM MDT WED JUN 18 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 APPROACHING UPPER LEVEL DISTURBANCE WILL HELP DESTABILIZE THE ATMOSPHERE AND ALLOW ISOLATED THUNDERSTORMS TO DEVELOP OVER THE PLAINS BY LATE AFTERNOON AND CONTINUE UNTIL NEAR MIDNIGHT. THE THUNDERSTORM ACTIVITY WILL DEVELOP A LITTLE EARLIER OVER THE MOUNTAINS AND THEN MOVE ON TO THE PLAINS. THE MAIN THREAT FROM THE POTENTIAL STORMS IS HAIL AND GUSTY WINDS. STRONG WINDS IN THE MID LEVELS WILL KEEP THE STORMS MOVING RATHER QUICKLY AND INHIBIT THE THREAT OF HEAVY RAIN. MAXIMUM RAINFALL AMOUNTS WILL BE AROUND ONE-HALF OR THREE-QUARTERS OF AN INCH IN AN HOUR. SPOTTER ACTIVATION MAY BE NEEDED BY LATE AFTERNOON. HERALD/BOODA
Special weather statement, Jun 18, 2:25 PM MDT, 2 hours 16 minutes before
COZ035-038-043-182100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 225 PM MDT WED JUN 18 1997 ...THUNDERSTORMS DEVELOPING IN EASTERN LARIMER AND WESTERN WELD COUNTIES THIS AFTERNOON... AT 210 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 7 MILES NORTH OF BUCKEYE...OR ABOUT 22 MILES NORTH OF FORT COLLINS. THE PUBLIC REPORTED FUNNEL CLOUDS WITH THIS STORM. THE STORM WAS MOVING EAST AT 20 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...GREELEY...AULT...BELLVUE...CARR... EATON...EVANS...GALETON...HARMONY...JOHNSTOWN...LA SALLE...LIVERMORE ...LOVELAND...LUCERNE...MASONVILLE...MILLIKEN...NATURAL FORT REST AREA...NUNN...PIERCE...POUDRE PARK...PURCELL...ROCKPORT... EVERANCE ..TEDS PLACE...TIMNATH...VIRGINIA DALE...WELLINGTON AND WINDSOR SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. RJK
Special weather statement, Jun 18, 2:27 PM MDT, 2 hours 14 minutes before
COZ035-038-043-182100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 225 PM MDT WED JUN 18 1997 ...THUNDERSTORMS DEVELOPING IN EASTERN LARIMER AND WESTERN WELD COUNTIES THIS AFTERNOON... AT 210 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 7 MILES NORTH OF BUCKEYE...OR ABOUT 22 MILES NORTH OF FORT COLLINS. THE PUBLIC REPORTED FUNNEL CLOUDS WITH THIS STORM. THE STORM WAS MOVING EAST AT 20 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...GREELEY...AULT...BELLVUE...CARR... EATON...EVANS...GALETON...HARMONY...JOHNSTOWN...LA SALLE...LIVERMORE ...LOVELAND...LUCERNE...MASONVILLE...MILLIKEN...NATURAL FORT REST AREA...NUNN...PIERCE...POUDRE PARK...PrURCELL...ROCKPORT... EVERANCE ..TEDS PLACE...TIMNATH...VIRGINIA DALE...WELLINGTON AND WINDSOR SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. RJK
Special weather statement, Jun 18, 3:44 PM MDT, 57 minutes before
COZ038-042-182230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 344 PM MDT WED JUN 18 1997 ...THUNDERSTORMS MOVING ALONG THE COLORADO/WYOMING BORDER... AT 339 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 10 MILES WEST OF GROVER...OR ABOUT 37 MILES NORTHEAST OF GREELEY. ANOTHER STORM WAS OVER THE WELD/LARIMER COUNTY LINE. THE STORMS WERE MOVING EAST AT 25 MILES PER HOUR. PERSONS IN OR NEAR CARR...GROVER AND ROCKPORT SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HAIL UP TO A HALF INCH IN DIAMETER...BRIEF HEAVY RAIN AND WIND GUSTS UP TO 35 MPH ARE POSSIBLE AS THE THUNDERSTORM MOVES. INTENSE LIGHTNING IS BEING DETECTED WITH THIS 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. A TORNADO WATCH REMAINS IN EFFECT FOR MOST OF NORTHEASTERN COLORADO UNTIL 9 PM MDT. DANKERS
Special weather statement, Jun 18, 3:45 PM MDT, 56 minutes before
COZ038-042-182230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 344 PM MDT WED JUN 18 1997 ...THUNDERSTORMS MOVING ALONG THE COLORADO/WYOMING BORDER... AT 339 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 10 MILES WEST OF GROVER...OR ABOUT 37 MILES NORTHEAST OF GREELEY. ANOTHER STORM WAS OVER THE WELD/LARIMER COUNTY LINE. THE STORMS WERE MOVING EAST AT 25 MILES PER HOUR. PERSONS IN OR NEAR CARR...GROVER AND ROCKPORT SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HAIL UP TO A HALF INCH IN DIAMETER...BRIEF HEAVY RAIN AND WIND GUSTS UP TO 35 MPH ARE POSSIBLE AS THE THUNDERSTORM MOVES. INTENSE LIGHTNING IS BEING DETECTED WITH THIS 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 EM&ERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES. A TORNADO WATCH REMAINS IN EFFECT FOR MOST OF NORTHEASTERN COLORADO UNTIL 9 PM MDT. DANKERS
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 4:03 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 27 min |
| Jun 18, 4:49 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 41 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.