Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 106, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 21, 1997, 6:12 PM MDT for Weld County, Colorado. It was in force for 48 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
- Jul 21, 1997, 6:12 PM MDT (00:12 UTC)
- Expired
- Jul 21, 1997, 7:00 PM MDT
- In force
- 48 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), 102 km from the middle of the area, began a volume at 00:11 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 00:00Z, 0.2 hours before the alert went out and 104 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
- 67 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 3399 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -11 m²/s²
- 0-3 km storm-relative helicity
- -4 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 220013 RRA
SVRDEN
COC123-220100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
612 PM MDT MON JUL 21 1997
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SEVERE
THUNDERSTORM WARNING EFFECTIVE UNTIL 700 PM MDT FOR PEOPLE IN THE
FOLLOWING COUNTIES...
IN NORTHEAST COLORADO
EAST CENTRAL WELD
INCLUDING THE FOLLOWING LOCATIONS
NEW RAYMER AND STONEHAM
AT 612 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 11 MILES NORTH OF NEW RAYMER...OR ABOUT 33 MILES
WEST OF STERLING.
THE STORM WAS MOVING SOUTH/SOUTHEAST AT 15 MILES PER HOUR AND WILL
BE MOVING INTO THE STONEHAM AND NEW RAYMER AREAS BY 650 PM.
LARGE HAIL AND DAMAGING WIND GUSTS UP TO 60 MPH ARE POSSIBLE WITH
THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT
YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. STAY AWAY
FROM WINDOWS. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES
WITH LITTLE OR NO ADVANCED WARNING.
BARJENBRUCH
LAT...LON 4080 10360 4053 10359 4054 10386 4080 10389
4088 10381What 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, Jul 21, 1:25 PM MDT, 4 hours 47 minutes before
COZ049-212000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 125 PM MDT MON JUL 21 1997 ...THUNDERSTORM WITH HEAVY RAIN IN CENTRAL WASHINGTON COUNTY... AT 123 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM JUST WEST OF ELBA...OR ABOUT 16 MILES SOUTH OF AKRON. THIS STORM WAS PRODUCING TORRENTIAL RAIN...SMALL HAIL...AND GUSTY WINDS UP TO 50 MPH. THE STORM WAS NEARLY STATIONARY...AND WILL PRODUCE 1 TO 2 INCHES OF RAIN IN 30 MINUTES OR LESS. HEAVY RAINS MAY FLOOD LOW LYING AREAS. DO NOT DRIVE ACROSS FLOODED ROADS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. BARJENBRUCH
Special weather statement, Jul 21, 1:26 PM MDT, 4 hours 46 minutes before
COZ049-212000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 125 PM MDT MON JUL 21 1997 ...THUNDERSTORM WITH HEAVY RAIN IN CENTRAL WASHINGTON COUNTY... AT 123 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM JUST WEST OF ELBA...OR ABOUT 16 MILES SOUTH OF AKRON. THIS STORM WAS PRODUCING TORRENTIAL RAIN...SMALL HAIL...AND GUSTY WINDS UP TO 50 MPH. THE STORM WAS NEARLY STATIONARY...AND WILL PRODUCE 1 TO 2 INCHES OF RAIN IN 30 MINUTES OR LESS. HEAVY RAINS MAY FLOOD LOW LYING AREAS. DO NOT DRIVE ACROSS FLOODED ROADS. WATER LEVELS OF SMALL STREAMS AND RIVERS MAY ALSO RISE...THEREFORE SEEK HIGHER GROUND IF THREATENED BY FLOOD WATERS. BARJENBRUCH
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.