Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 82, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 24, 1997, 5:11 PM MDT for Weld County, Colorado. It was in force for 49 min. 2 reports 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 24, 1997, 5:11 PM MDT (23:11 UTC)
- Expired
- Jun 24, 1997, 6:00 PM MDT
- In force
- 49 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Weld County, CO
The radar
The Denver radar (KFTG), 64 km from the middle of the area, began a volume at 23:10 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 24, 5:17 PM MDT | Hail 0.75 | La Salle, CO | |
| Jun 24, 5:47 PM MDT | Hail 0.75 | Masters, 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 nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.2 hours before the alert went out and 114 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
- 210 J/kg
- Mixed-layer CIN
- -271 J/kg
- Mixed-layer LCL
- 2200 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- -34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
339
WUUS1 KDEN 242313 RRA
SVRDEN
COC123-250000-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
511 PM MDT TUE JUN 24 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
CENTRAL WELD
INCLUDING THE FOLLOWING LOCATIONS
EASTERN GREELEY...BARNESVILLE...GILL...KERSEY...
LUCERNE...MILTON RESERVOIR AND RIVERSIDE RESERVOIR
AT 504 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 4 MILES SOUTHEAST OF EVANS...OR ABOUT 8 MILES
SOUTHEAST OF GREELEY.
THE STORM WAS MOVING EAST 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 LARGE DAMAGING HAIL...DAMAGING WINDS OVER 60
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
HEAVY RAINS MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND
UNDERPASSES. AVOID THESE AREAS AND DO NOT CROSS FLOODED ROADS AS THEY
MAY BE WASHED OUT. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO
RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS.
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 4020 10421 4018 10468 4051 10472 4051 10447
4053 10420
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 24, 11:15 AM MDT, 5 hours 56 minutes before
COZ030-032>050-260600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT TUE JUN 24 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: IT WILL BE A VERY ACTIVE AFTERNOON AND EVENING FOR CONVECTION OVER NORTHEAST COLORADO. SEVERAL FACTORS WILL COME TOGETHER TO PRODUCE WIDESPREAD...POSSIBLY SEVERE THUNDERSTORMS WITH HEAVY RAIN...ESPECIALLY EAST OF GREELEY TO LIMON LINE THIS EVENING. SOUTHEAST WINDS WILL CONTINUE TO FEED MOIST AIR ACROSS NORTHEAST COLORADO INTO SOUTHEAST WYOMING. A WEAK UPPER TROUGH WILL ALSO HELP FOCUS THE THUNDERSTORMS IN NORTHEAST COLORADO LATE THIS AFTERNOON AND EVENING. A SURFACE LOW WILL STRENGTHEN EAST OR NORTHEAST OF DENVER WHICH WILL ALSO ACT AS A FOCUS FOR THUNDERSTORMS. WINDS WILL TURN CLOCKWISE WITH HEIGHT...SO THUNDERSTORMS WILL ALSO BE CAPABLE OF PRODUCING TORNADOES. THUNDERSTORMS WILL RAPIDLY FORM OVER THE HIGHER TERRAIN...THE FOOTHILLS...PALMER DIVIDE AND CHEYENNE RIDGE EARLY THIS AFTERNOON... AND DEVELOP TO THE PLAINS BEFORE 2PM. BY EVENING... THUNDERSTORMS SHOULD BEGIN DECREASING OVER THE URBAN CORRIDOR...WHILE THUNDERSTORMS BECOME WIDESPREAD TO THE NORTHEAST OF GREELEY AND LIMON. WE WILL HAVE TO WATCH FOR...TORNADOES...LARGE HAIL...AND POSSIBLE FLOODING. SPOTTERS WILL LIKELY BE ACTIVATED AROUND 1PM. RTG
Special weather statement, Jun 24, 11:45 AM MDT, 5 hours 26 minutes before
COZ030-032>050-270600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1145 AM MDT TUE JUN 24 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 SURFACE AIRMASS HAS SLIGHTLY DRIED TODAY FROM YESTERDAY AND THERE HAS BEEN SOME SLIGHT WARMING ALOFT. IN SPITE OF THESE TWO FACTORS THERE IS STILL ENOUGH MOISTURE PRESENT FOR THUNDERSTORM DEVELOPMENT WHEN COUPLED WITH THE EXPECTED SIGNIFICANT DAYTIME HEATING. SOUTHEAST SURFACE FLOW SHOULD CONTINUE TO DEVELOP AND INCREASE OVER THE PLAINS THIS AFTERNOON CREATING A CONVERGENCE LINE FOR THUNDERSTORMS TO DEVELOP UPON TO THE EAST OF THE DENVER METRO AREA. EXPECT STORMS TO DEVELOP OVER THE HIGHER TERRAIN BY 1:30 PM...AND OUT OVER THE PLAINS BY 4 PM. SOME OF THE STORMS MAY BE SEVERE OVER MOST OF THE PLAINS...DUE TO LARGE HAIL AND STRONG WINDS. THE BEST THREAT OF SEVERE WEATHER WILL BE OVER LINCOLN... WASHINGTON...LOGAN....PHILLIPS...AND SEDGWICK COUNTIES. SPOTTER ACTIVATION MAY BE NEEDED AFTER 3 PM. RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 6:59 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 31 min |
| Jun 23, 8:14 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 46 min |
| Jun 23, 9:00 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Jun 24, 3:11 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 49 min |
| Jun 24, 3:58 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 47 min |
| Jun 24, 4:40 PM MDT | Severe Thunderstorm Warning | BOU | Elbert, Lincoln | 50 min |
| Jun 24, 4:43 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 32 min |
| Jun 24, 5:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 30 min |
| Jun 24, 5:26 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 49 min |
| Jun 24, 5:36 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 39 min |
| Jun 24, 5:50 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 40 min |
| Jun 24, 5:54 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln | 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.