Alert archive / Colorado / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 86, NWS Denver/Boulder, CO

June 24, 1997Morgan County, Weld County, Colorado

NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 24, 1997, 5:50 PM MDT for Morgan County, 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 24, 1997, 5:50 PM MDT (23:50 UTC)
Expired
Jun 24, 1997, 6:30 PM MDT
In force
40 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 Denver radar (KFTG), 58 km from the middle of the area, began a volume at 23:51 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

TimeReportWhereRemark
Jun 24, 6:20 PM MDTHail 1Masters, 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, 11.8 hours before the alert went out and 92 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 1997-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 210 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1997-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -27 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
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

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

573 
WUUS1 KDEN 242352 RRA
SVRDEN
COC087-123-250030-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
550 PM MDT TUE JUN 24 1997

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...

IN NORTHEAST COLORADO
     SOUTH CENTRAL WELD AND SOUTHWESTERN MORGAN

INCLUDING THE FOLLOWING LOCATIONS
     GOODRICH...HOYT...JACKSON RESERVOIR...ORCHARD...PROSPECT
     VALLEY...RIVERSIDE RESERVOIR...ROGGEN AND WIGGINS

AT 545 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 6 MILES NORTH OF ROGGEN...OR ABOUT 22 MILES
SOUTHEAST OF GREELEY.

THE STORM WAS MOVING EAST SOUTHEAST AT 20 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 4026 10404 4002 10403 4002 10450 4042 10455
          4043 10406

KLEYLA

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 23, 6:59 PM MDTTornado WarningBOUAdams, Arapahoe31 min
Jun 23, 8:14 PM MDTSevere Thunderstorm WarningBOUWeld46 min
Jun 23, 9:00 PM MDTSevere Thunderstorm WarningBOUWeld45 min
Jun 24, 3:11 PM MDTSevere Thunderstorm WarningBOUDouglas, Elbert49 min
Jun 24, 3:58 PM MDTSevere Thunderstorm WarningBOUElbert47 min
Jun 24, 4:40 PM MDTSevere Thunderstorm WarningBOUElbert, Lincoln50 min
Jun 24, 4:43 PM MDTSevere Thunderstorm WarningBOUMorgan, Weld32 min
Jun 24, 5:11 PM MDTSevere Thunderstorm WarningBOUWeld49 min
Jun 24, 5:15 PM MDTSevere Thunderstorm WarningBOUMorgan30 min
Jun 24, 5:26 PM MDTSevere Thunderstorm WarningBOUWashington49 min
Jun 24, 5:36 PM MDTSevere Thunderstorm WarningBOULincoln39 min
Jun 24, 5:54 PM MDTSevere Thunderstorm WarningBOULincoln36 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.