Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 2, 1997, 4:35 PM MDT for Weld County, Colorado. It was in force for 40 min. 1 report came from 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, with what was reported inside it.
The facts
- Issued
- Jun 2, 1997, 4:35 PM MDT (22:35 UTC)
- Expired
- Jun 2, 1997, 5:15 PM MDT
- In force
- 40 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 79 km from the middle of the area, began a volume at 22:56 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 2, 4:55 PM MDT | Hail 1 | Briggsdale, CO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
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 2, 2:00 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.6 hours before the alert went out and 116 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
- 99 J/kg
- Mixed-layer CIN
- -13 J/kg
- Mixed-layer LCL
- 562 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -2 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 022239 RRA
SVRDEN
COC123-022315-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
435 PM MDT MON JUN 2 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
CENTRAL WELD
INCLUDING THE FOLLOWING LOCATIONS
BRIGGSDALE
AT 430 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 3 MILES NORTHWEST OF BRIGGSDALE...OR ABOUT 25
MILES NORTHEAST OF GREELEY. ONE INCH SIZE HAIL WAS REPORTED IN
BRIGGSDALE AT 428 PM MDT.
THE STORM WAS MOVING EAST SOUTHEAST AT 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 TORNADOES WITH LITTLE WARNING...LARGE
DAMAGING HAIL...DAMAGING WINDS OVER 60 MPH...DEADLY LIGHTNING...AND
VERY HEAVY RAIN.
A TORNADO WATCH REMAINS IN EFFECT FOR NORTHEAST COLORADO UNTIL
8 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.
LAT...LON 4054 10401 4054 10416 4051 10437 4072 10452
4078 10415
KLEYLAWhat 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 2, 1:13 PM MDT, 3 hours 22 minutes before
COZ033-035-038-022000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 113 PM MDT MON JUN 2 1997 ...STRONG THUNDERSTORMS DEVELOPING OVER LARIMER COUNTY EARLY THIS AFTERNOON... AT 110 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM NEAR VIRGINIA DALE OR ABOUT 25 MILES NORTHWEST OF FORT COLLINS. THIS STORM WILL PRODUCE VERY HEAVY RAIN...HAIL TO 1/2 INCH IN DIAMETER...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORM WAS MOVING EAST SOUTHEAST AT 20 MILES PER HOUR. PERSONS IN THE PATH OF THIS STORM SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. KLEYLA
Special weather statement, Jun 2, 1:14 PM MDT, 3 hours 21 minutes before
COZ033-035-038-022000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 113 PM MDT MON JUN 2 1997 ...STRONG THUNDERSTORMS DEVELOPING OVER LARIMER COUNTY EARLY THIS AFTERNOON... AT 110 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM NEAR VIRGINIA DALE OR ABOUT 25 MILES NORTHWEST OF FORT COLLINS. THIS STORM WILL PRODUCE VERY HEAVY RAIN...HAIL TO 1/2 INCH IN DIAMETER...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORM WAS MOVING EAST SOUTHEAST AT 20 MILES PER HOUR. PERSONS IN THE PATH OF THIS STORM SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. KLEYLA
Special weather statement, Jun 2, 1:45 PM MDT, 2 hours 50 minutes before
COZ033-035-038-022015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 145 PM MDT MON JUN 2 1997 ...STRONG THUNDERSTORMS CONTINUE OVER EASTERN LARIMER COUNTY EARLY THIS AFTERNOON... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 12 MILES NORTHWEST OF BUCKEYE...OR ABOUT 26 MILES NORTHWEST OF FORT COLLINS. THIS STORM CONTAINS VERY HEAVY RAIN...HAIL TO 1/2 INCH IN DIAMETER...GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORM WAS MOVING EAST SOUTHEAST AT 15 MILES PER HOUR AND WILL BE PERSONS IN THE PATH OF THIS STORM SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. KLEYLA
Special weather statement, Jun 2, 1:45 PM MDT, 2 hours 50 minutes before
COZ033-035-038-022015- SPECIAL WEATHER STATEMENT...CORRECTED 2ND PARAGRAPH NATIONAL WEATHER SERVICE DENVER CO 145 PM MDT MON JUN 2 1997 ...STRONG THUNDERSTORMS CONTINUE OVER EASTERN LARIMER COUNTY EARLY THIS AFTERNOON... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 12 MILES NORTHWEST OF BUCKEYE...OR ABOUT 26 MILES NORTHWEST OF FORT COLLINS. THIS STORM CONTAINS VERY HEAVY RAIN...HAIL TO 1/2 INCH IN DIAMETER...GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORM WAS MOVING EAST SOUTHEAST AT 15 MILES PER HOUR. PERSONS IN THE PATH OF THIS STORM SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. KLEYLA
Special weather statement, Jun 2, 1:47 PM MDT, 2 hours 48 minutes before
COZ033-035-038-022015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 145 PM MDT MON JUN 2 1997 ...STRONG THUNDERSTORMS CONTINUE OVER EASTERN LARIMER COUNTY EARLY THIS AFTERNOON... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 12 MILES NORTHWEST OF BUCKEYE...OR ABOUT 26 MILES NORTHWEST OF FORT COLLINS. THIS STORM CONTAINS VERY HEAVY RAIN...HAIL TO 1/2 INCH IN DIAMETER...GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORM WAS MOVING EAST SOUTHEAST AT 15 MILES PER HOUR AND WILL BE PERSONS IN THE PATH OF THIS STORM SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. KLEYLA
Special weather statement, Jun 2, 1:49 PM MDT, 2 hours 46 minutes before
COZ033-035-038-022015- SPECIAL WEATHER STATEMENT...CORRECTED 2ND PARAGRAPH NATIONAL WEATHER SERVICE DENVER CO 145 PM MDT MON JUN 2 1997 ...STRONG THUNDERSTORMS CONTINUE OVER EASTERN LARIMER COUNTY EARLY THIS AFTERNOON... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 12 MILES NORTHWEST OF BUCKEYE...OR ABOUT 26 MILES NORTHWEST OF FORT COLLINS. THIS STORM CONTAINS VERY HEAVY RAIN...HAIL TO 1/2 INCH IN DIAMETER...GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORM WAS MOVING EAST SOUTHEAST AT 15 MILES PER HOUR. PERSONS IN THE PATH OF THIS STORM SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. KLEYLA
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 12:16 AM MDT | Severe Thunderstorm Warning | BOU | Logan, Washington | 44 min |
| Jun 2, 2:10 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 35 min |
| Jun 2, 3:30 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Jun 2, 3:56 PM MDT | Tornado Warning | BOU | Weld | 34 min |
| Jun 2, 4:55 PM MDT | Tornado Warning | BOU | Weld | 35 min |
| Jun 2, 5:18 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 42 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.