Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 36, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 12, 1997, 5:13 PM MDT for Morgan County, Weld County, Colorado. It was in force for 47 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 12, 1997, 5:13 PM MDT (23:13 UTC)
- Expired
- Jun 12, 1997, 6:00 PM MDT
- In force
- 47 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Morgan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 109 km from the middle of the area, began a volume at 23:13 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 12, 5:20 PM MDT | Hail 1.75 | New Raymer, 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 12, 12:30 PM MDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.2 hours before the alert went out and 90 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
- 48 J/kg
- Mixed-layer CIN
- -253 J/kg
- Mixed-layer LCL
- 1774 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- -3 m²/s²
- 0-3 km storm-relative helicity
- 52 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 122315 RRA
SVRDEN
COC087-123-130000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
513 PM MDT THU JUN 12 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
EAST CENTRAL WELD AND NORTH CENTRAL MORGAN
INCLUDING THE FOLLOWING LOCATIONS
NEW RAYMER
AT 510 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 3 MILES WEST OF NEW RAYMER...OR ABOUT 25 MILES
NORTH OF FORT MORGAN.
AT 510 PM MDT THE PUBLIC REPORTED 1.5" SIZE HAIN IN NEW RAYMER.
THE STORM WAS MOVING SOUTH AT 10 MILES PER HOUR.
A TORNADO WATCH REMAINS IN EFFECT FOR OF MOST OF EASTERN COLORADO
UNTIL 6 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.
&
KLEYLA
LAT...LON 4048 10360 4049 10389 4063 10400 4077 10373What 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 12, 11:55 AM MDT, 5 hours 18 minutes before
COZ041-121830- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1155 AM MDT THU JUN 12 1997 ...THUNDERSTORM WITH POSSIBLE FUNNEL CLOUD IN CENTRAL ELBERT COUNTY... AT 1152 AM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM OVER KIOWA...OR ABOUT 40 MILES SOUTHEAST OF DENVER. A WEATHER SPOTTER REPORTED A FUNNEL CLOUD JUST SOUTH OF THE ELIZABETH AREA. THE STORM WAS MOVING EAST AND NORTHEAST AT 15 MILES PER HOUR. PERSONS IN OR NEAR ELIZABETH AND KIOWA AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAIN AND HAIL WILL ALSO BE DEVELOPING WITH THIS STORM. A TORNADO WATCH IS ALSO IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL 6 PM MDT. ENTREKIN
Special weather statement, Jun 12, 12:01 PM MDT, 5 hours 12 minutes before
COZ041-121830- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1155 AM MDT THU JUN 12 1997 ...THUNDERSTORM WITH POSSIBLE FUNNEL CLOUD IN CENTRAL ELBERT COUNTY... AT 1152 AM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM OVER KIOWA...OR ABOUT 40 MILES SOUTHEAST OF DENVER. A WEATHER SPOTTER REPORTED A FUNNEL CLOUD JUST SOUTH OF THE ELIZABETH AREA. THE STORM WAS MOVING EAST AND NORTHEAST AT 15 MILES PER HOUR. PERSONS IN OR NEAR ELIZABETH AND KIOWA AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAIN AND HAIL WILL ALSO BE DEVELOPING WITH THIS STORM. A TORNADO WATCH IS ALSO IN EFFECT FOR MUCH OF EASTERN COLORADO UNTIL 6 PM MDT. ENTREKIN
Special weather statement, Jun 12, 12:10 PM MDT, 5 hours 3 minutes before
COZ035-121845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1210 PM MDT THU JUN 12 1997 ...THUNDERSTORMS DEVELOPING IN EASTERN LARIMER COUNTY... AT 1210 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 3 MILES EAST OF POUDRE PARK...OR ABOUT 11 MILES NORTHWEST OF FORT COLLINS. SPOTTERS HAVE REPORTED 1/2 HAIL WITH THIS STORM IN POURDE PARK. THE STORM WAS MOVING NORTHEAST AT 20 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...DRAKE...MASONVILLE...POUDRE PARK...AND WELLINGTON SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. A TORNADO WATCH IS IN EFFECT FOR THIS AREA UNTIL 6 PM MDT THIS EVENING. RJK
Special weather statement, Jun 12, 12:11 PM MDT, 5 hours 2 minutes before
COZ035-121845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1210 PM MDT THU JUN 12 1997 ...THUNDERSTORMS DEVELOPING IN EASTERN LARIMER COUNTY... AT 1210 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 3 MILES EAST OF POUDRE PARK...OR ABOUT 11 MILES NORTHWEST OF FORT COLLINS. SPOTTERS HAVE REPORTED 1/2 HAIL WITH THIS STORM IN POURDE PARK. THE STORM WAS MOVING NORTHEAST AT 20 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...DRAKE...MASONVILLE...POUDRE PARK...AND WELLINGTON SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. A TORNADO WATCH IS IN EFFECT FOR THIS AREA UNTIL 6 PM MDT THIS EVENING. RJK
Special weather statement, Jun 12, 12:30 PM MDT, 4 hours 43 minutes before
COZ045-046-049-121900-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1230 PM MDT THU JUN 12 1997
...THUNDERSTORM IN
EASTERN ARAPAHOE...NORTHEASTERN ELBERT...NORTH CENTRAL LINCOLN
AND SOUTHWESTERN WASHINGTON COUNTIES OF COLORADO
AT 1221 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM 5 MILES EAST OF AGATE...OR ABOUT 16 MILES NORTHWEST OF
LIMON.
THE STORM WAS MOVING NORTHEAST AT 25 MILES PER HOUR.
PERSONS IN OR NEAR AGATE AND JOLLY RANCH
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.
A TORNADO WATCH REMAINS IN EFFECT FOR ALL OF EASTERN COLORADO UNTIL
600 PM MDT.
GARD...WSFO DENVERSpecial weather statement, Jun 12, 12:31 PM MDT, 4 hours 42 minutes before
COZ045-046-049-121900-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1230 PM MDT THU JUN 12 1997
...THUNDERSTORM IN
EASTERN ARAPAHOE...NORTHEASTERN ELBERT...NORTH CENTRAL LINCOLN
AND SOUTHWESTERN WASHINGTON COUNTIES OF COLORADO
AT 1221 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM 5 MILES EAST OF AGATE...OR ABOUT 16 MILES NORTHWEST OF
LIMON.
THE STORM WAS MOVING NORTHEAST AT 25 MILES PER HOUR.
PERSONS IN OR NEAR AGATE AND JOLLY RANCH
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.
A TORNADO WATCH REMAINS IN EFFECT FOR ALL OF EASTERN COLORADO UNTIL
600 PM MDT.
GARD...WSFO DENVERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 2:11 PM MDT | Tornado Warning | BOU | Arapahoe, Douglas | 34 min |
| Jun 12, 2:19 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 41 min |
| Jun 12, 2:36 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 39 min |
| Jun 12, 2:55 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Weld | 50 min |
| Jun 12, 3:37 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 38 min |
| Jun 12, 3:49 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 41 min |
| Jun 12, 4:27 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 48 min |
| Jun 12, 5:24 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 36 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.