Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 124, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 21, 1998, 4:55 PM MDT for Logan County, Weld County, Colorado. It was in force for 35 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, 1998, 4:55 PM MDT (22:55 UTC)
- Expired
- Jul 21, 1998, 5:30 PM MDT
- In force
- 35 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Logan County, CO, Weld County, CO
The radar
The Cheyenne radar (KCYS), 105 km from the middle of the area, began a volume at 22:56 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.9 hours before the alert went out and 252 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
- 128 J/kg
- Mixed-layer CIN
- -624 J/kg
- Mixed-layer LCL
- 2474 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 37 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 212255 RRA
SVRDEN
COC075-123-212330-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
455 PM MDT TUE JUL 21 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN LOGAN COUNTY IN NORTHEAST COLORADO
NORTHEASTERN WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 530 PM MDT
* AT 445 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 26 MILES NORTHWEST OF WESTPLAINS.
MOVING SOUTHEAST AT 25 MILES PER HOUR.
LOCATIONS IN THE WARNING INCLUDE...NORTH STERLING RESERVOIR AND
WESTPLAINS
WIND GUSTS OF 60 TO 70 MPH HAVE OCCURRED NEAR THE NEBRASKA-COLORADO BORDER
AHEAD OF THE SEVERE THUNDERSTORM.
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...D
EADLY LIGHTNING...AND VERY HEAVY RAIN.
LAT...LON 4099 10387 4075 10382 4077 10319 4099 10321
4100 10361
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, Jul 21, 11:32 AM MDT, 5 hours 23 minutes before
COZ030-032>050-220600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT TUE MUL 21 1998 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: INCREASING MOISTURE ALONG WITH WARM AFTERNOON TEMPERATURES WILL PRODUCE ISOLATED TO WIDELY SCATTERED LATE AFTERNOON AND EARLY EVENING THUNDERSTORMS OVER THE AREA...WITH BEST CHANCES FOR STORMS IN EXTREME NORTHEASTERN COLORADO. MOST STORM S WILL PRODUCE MORE LIGHTNING AND WIND THAN RAIN AND ACITIVITY SHOULD DIMINISH AFTER 8 OR 9 PM. SPOTTER ACTIVITY SHOULD NOT BE REQUIRED. TUNNELL
Special weather statement, Jul 21, 1:30 PM MDT, 3 hours 25 minutes before
COZ033>035-212015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 130 PM MDT TUE JUL 21 1998 ...THUNDERSTORMS INTENSIFYING IN SOUTH CENTRAL LARIMER... NORTHWESTERN BOULDER AND EXTREME NORTHEASTERN GRAND COUNTIES OF COLORADO AT 125 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SCATTERED THUNDERSTORMS FROM ESTES PARK SOUTH TO WARD. THESE THUNDERSTORMS WILL PRODUCE VERY HEAVY RAIN...HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 10 MPH. PERSONS IN OR NEAR ALLENSPARK...BRAINARD LAKE...DRAKE...ESTES PARK... GLEN HAVEN...GOLD HILL...JAMESTOWN...LONG'S PEAK...MEEKER PARK...MT AUDUBON...PEACEFUL VALLEY...RAYMOND AND WARD SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY FLOOD LOW LYING AREAS. 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. KLEYLA
Special weather statement, Jul 21, 1:30 PM MDT, 3 hours 25 minutes before
COZ033>035-212015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 130 PM MDT TUE JUL 21 1998 ...THUNDERSTORMS INTENSIFYING IN SOUTH CENTRAL LARIMER... NORTHWESTERN BOULDER AND EXTREME NORTHEASTERN GRAND COUNTIES OF COLORADO AT 125 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SCATTERED THUNDERSTORMS FROM ESTES PARK SOUTH TO WARD. THESE THUNDERSTORMS WILL PRODUCE VERY HEAVY RAIN...HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 10 MPH. PERSONS IN OR NEAR ALLENSPARK...BRAINARD LAKE...DRAKE...ESTES PARK... GLEN HAVEN...GOLD HILL...JAMESTOWN...LONG'S PEAK...MEEKER PARK...MT AUDUBON...PEACEFUL VALLEY...RAYMOND AND WARD SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY FLOOD LOW LYING AREAS. 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. KLEYLA
Special weather statement, Jul 21, 2:10 PM MDT, 2 hours 45 minutes before
COZ033>035-038-212045- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 210 PM MDT TUE JUL 21 1998 ...SCATTERED THUNDERSTORMS CONTINUE OVER PORTIONS OF LARIMER... WESTERN BOULDER AND NORTHEASTERN GRAND COUNTIES OF COLORADO EARLY THIS AFTERNOON... AT 200 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS CAPABLE OF PRODUCING HEAVY RAIN UP TO 1 INCH PER HOUR...SMALL HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING OVER PORTIONS OF LARIMER...WESTERN BOULDER AND NORTHEASTERN GRAND COUNTIES. THE THUNDERSTORMS WERE MOVING SLOWLY SOUTHEAST AT 5 TO 10 MPH. PERSONS IN OR NEAR ALLENSPARK...BELLVUE...BRAINARD LAKE...BUCKHORN MOUNTAIN...DRAKE...ESTES PARK...GLEN HAVEN...GRAND LAKE...LIVERMORE...LONGS PEAK...MEEKER PARK...MISHOWAKA...MT AUDUBON...PEACEFUL VALLEY...PINGREE PARK...POUDRE PARK...RAYMOND...RUSTIC...TEDS PLACE...TRAIL RIDGE AND WARD SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY FLOOD LOW LYING AREAS. 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. KLEYLA
Special weather statement, Jul 21, 3:10 PM MDT, 1 hour 45 minutes before
COZ035-038-212145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 310 PM MDT TUE JUL 21 1998 ...THUNDERSTORMS CONTINUE IN EASTERN LARIMER AND EXTREME WEST CENTRAL WELD COUNTIES OF COLORADO THIS AFTERNOON... AT 305 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS FROM WEST OF CARR EXTENDING SOUTH TO 10 MILES NORTHWEST OF LOVELAND. THE STRONGEST THUNDERSTORM WAS LOCATED 2 MILES NORTH OF TEDS PLACE...OR ABOUT 9 MILES NORTHWEST OF FORT COLLINS. THESE THUNDERSTORMS WILL PRODUCE RAINFALL UP TO 1 INCH PER HOUR... SMALL HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING SLOWLY EAST AT 5 TO 10 MPH. PERSONS IN OR NEAR FORT COLLINS...BELLVUE...BUCKHORN MOUNTAIN... DRAKE...GLEN HAVEN...HARMONY...LIVERMORE...MASONVILLE...MISHOWAKA... POUDRE PARK...TEDS PLACE...TIMNATH AND WELLINGTON SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY BRIEFLY 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. KLEYLA
Special weather statement, Jul 21, 3:10 PM MDT, 1 hour 45 minutes before
COZ035-038-212145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 310 PM MDT TUE JUL 21 1998 ...THUNDERSTORMS CONTINUE IN EASTERN LARIMER AND EXTREME WEST CENTRAL WELD COUNTIES OF COLORADO THIS AFTERNOON... AT 305 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SCATTERED THUNDERSTORMS FROM WEST OF CARR EXTENDING SOUTH TO 10 MILES NORTHWEST OF LOVELAND. THE STRONGEST THUNDERSTORM WAS LOCATED 2 MILES NORTH OF TEDS PLACE...OR ABOUT 9 MILES NORTHWEST OF FORT COLLINS. THESE THUNDERSTORMS WILL PRODUCE RAINFALL UP TO 1 INCH PER HOUR... SMALL HAIL...GUSTY WINDS AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING SLOWLY EAST AT 5 TO 10 MPH. PERSONS IN OR NEAR FORT COLLINS...BELLVUE...BUCKHORN MOUNTAIN... DRAKE...GLEN HAVEN...HARMONY...LIVERMORE...MASONVILLE...MISHOWAKA... POUDRE PARK...TEDS PLACE...TIMNATH AND WELLINGTON SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. HEAVY RAINS MAY BRIEFLY 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. KLEYLA
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 5:31 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 44 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1998Every severe thunderstorm warning in 1998
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.