Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 60, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 15, 1997, 1:41 PM MDT for Larimer 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 15, 1997, 1:41 PM MDT (19:41 UTC)
- Expired
- Jun 15, 1997, 2:15 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Larimer County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 42 km from the middle of the area, began a volume at 19:42 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 nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 7.7 hours before the alert went out and 173 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
- 62 J/kg
- Mixed-layer CIN
- -239 J/kg
- Mixed-layer LCL
- 1525 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- -73 m²/s²
- 0-3 km storm-relative helicity
- -77 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 151947 RRA
SVRDEN
COC069-123-152015-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
141 PM MDT SUN JUN 15 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 215 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
NORTHWESTERN WELD
IN NORTH CENTRAL COLORADO
EAST CENTRAL LARIMER
INCLUDING THE FOLLOWING LOCATIONS
CARR...NUNN...ROCKPORT AND WELLINGTON
AT 135 PM MDT THE PUBLIC REPORTED 3/4 INCH HAIL 2 MILES NORTHWEST OF
WAVERLY...OR ABOUT 10 MILES NORTH OF FORT COLLINS. NATIONAL WEATHER
SERVICE DOPPLER RADAR ALSO INDICATED ANOTHER STRONG THUNDERSTORM TO
THE NORTHEAST OF CARR...IN NORTHWESTERN WELD COUNTY.
THE STORMS WERE MOVING EAST AT 5 MILES PER HOUR.
HAIL UP TO ONE INCH IN DIAMETER AND BRIEF HEAVY RAINS WILL OCCUR
WITH THESE THUNDERSTORMS. MOVE TO SHELTER UNTIL THE STORM PASSES TO
AVOID BEING STRUCK BY LIGHTNING.
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 4072 10464 4061 10513 4076 10524 4088 10501
4100 10461What 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 15, 11:25 AM MDT, 2 hours 16 minutes before
COZ030-032>050-160600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1125 AM MDT SUN JUN 15 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: THE AIRMASS OVER NORTHEAST COLORADO HAS MODIFIED THIS MORNING IN THE WAKE OF A WEATHER DISTURBANCE WHICH PASSED SOUTH OF THE AREA OVERNIGHT. AS A RESULT...THE CURRENT WIND PROFILE DOES NOT FAVOR THE DEVELOPMENT OF STRONG OR EVEN SEVERE THUNDERSTORMS TODAY. THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG THE FOOTHILLS...MOVING ONTO THE PLAINS DURING THE AFTERNOON AND EVENING. A WEAK COLD FRONT AN AND UPPER LEVEL DISTURBANCE WILL MOVE ACROSS NORTHEAST COLORADO THIS AFTERNOON...BRINGING AN INCREASE IN LOW LEVEL MOISTURE ACROSS NORTHEAST COLORADO. AS A RESULT...SOME OF THE STORMS COULD PRODUCE BRIEF HEAVY RAINS AS WELL AS SMALL HAIL...MAINLY EAST OF A LIMON TO AKRON LINE AND OVER THE MOUNTAINS AND HIGHER FOOTHILLS. SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. LESZCYNSKI
Special weather statement, Jun 15, 11:26 AM MDT, 2 hours 15 minutes before
COZ030-032>050-160600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1125 AM MDT SUN JUN 15 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: THE AIRMASS OVER NORTHEAST COLORADO HAS MODIFIED THIS MORNING IN THE WAKE OF A WEATHER DISTURBANCE WHICH PASSED SOUTH OF THE AREA OVERNIGHT. AS A RESULT...THE CURRENT WIND PROFILE DOES NOT FAVOR THE DEVELOPMENT OF STRONG OR EVEN SEVERE THUNDERSTORMS TODAY. THUNDERSTORMS WILL CONTINUE TO DEVELOP ALONG THE FOOTHILLS...MOVING ONTO THE PLAINS DURING THE AFTERNOON AND EVENING. A WEAK COLD FRONT AN AND UPPER LEVEL DISTURBANCE WILL MOVE ACROSS NORTHEAST COLORADO THIS AFTERNOON...BRINGING AN INCREASE IN LOW LEVEL MOISTURE ACROSS NORTHEAST COLORADO. AS A RESULT...SOME OF THE STORMS COULD PRODUCE BRIEF HEAVY RAINS AS WELL AS SMALL HAIL...MAINLY EAST OF A LIMON TO AKRON LINE AND OVER THE MOUNTAINS AND HIGHER FOOTHILLS. SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. LESZCYNSKI
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 14, 6:05 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 35 min |
| Jun 14, 7:35 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Washington | 25 min |
| Jun 14, 7:55 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 45 min |
| Jun 14, 8:52 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips, Sedgwick | 38 min |
| Jun 14, 9:38 PM MDT | Severe Thunderstorm Warning | BOU | Phillips | 27 min |
| Jun 15, 12:33 AM MDT | Flash Flood Warning | BOU | Phillips | 3 hr |
| Jun 15, 3:25 AM MDT | Flash Flood Warning | BOU | Phillips | 2 hr |
| Jun 15, 5:23 AM MDT | Flash Flood Warning | BOU | Phillips | 3 hr |
| Jun 15, 3:11 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Boulder, Weld | 34 min |
| Jun 15, 3:20 PM MDT | Tornado Warning | BOU | Adams, Weld | 25 min |
| Jun 15, 3:20 PM MDT | Tornado Warning | BOU | Boulder | 25 min |
| Jun 15, 3:53 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 32 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.