Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 79, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 8, 1998, 4:11 PM MDT for Boulder County, Jefferson County, Colorado. It was in force for 49 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 8, 1998, 4:11 PM MDT (22:11 UTC)
- Expired
- Jun 8, 1998, 5:00 PM MDT
- In force
- 49 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Boulder County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 63 km from the middle of the area, began a volume at 22:15 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, 10.2 hours before the alert went out and 175 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
- 56 J/kg
- Mixed-layer CIN
- -25 J/kg
- Mixed-layer LCL
- 546 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -97 m²/s²
- 0-3 km storm-relative helicity
- -66 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.1
The text
As transmitted, in the capitals the NWS used until 2016.
379
WUUS1 KDEN 082212 RRA
SVRDEN
COC013-059-082300-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
411 PM MDT MON JUN 8 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL BOULDER COUNTY IN NORTHEAST COLORADO
NORTHWESTERN JEFFERSON COUNTY IN NORTHEAST COLORADO
* UNTIL 500 PM MDT
* AT 410 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 4 MILES NORTHWEST OF WHITE RANCH OPEN SPACE...
OR ABOUT 21 MILES WEST OF DENVER...MOVING EAST AT 15 MILES PER
HOUR.
* LOCATIONS IN THE WARNING INCLUDE...NORTHWESTERN ARVADA...ELDORADO
SPRINGS...ROCKY FLATS AND WHITE RANCH OPEN SPACE
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.
LAT...LON 3994 10538 3980 10537 3981 10514 3993 10512
COOPERWhat 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 8, 11:30 AM MDT, 4 hours 41 minutes before
COZ030-032>050-090600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1130 AM MDT MON JUN 08 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: A COOLER AND MORE STABLE AIRMASS HAS MOVED OVER THE AREA AND WILL ACT AS A LID TO KEEP SEVERE THUNDERSTORMS FROM DEVELOPING. WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE STILL EXPECTED OVER THE AREA THROUGH THIS EVENING. SOME OF THE STRONGER STORMS COULD PRODUCE SMALL HAIL AND BRIEF HEAVY RAIN...BUT ARE NOT EXPECTED TO BECOME SEVERE. SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. LESZCYNSKI
Special weather statement, Jun 8, 11:30 AM MDT, 4 hours 41 minutes before
COZ030-032>050-090600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1130 AM MDT MON JUN 08 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: A COOLER AND MORE STABLE AIRMASS HAS MOVED OVER THE AREA AND WILL ACT AS A LID TO KEEP SEVERE THUNDERSTORMS FROM DEVELOPING. WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE STILL EXPECTED OVER THE AREA THROUGH THIS EVENING. SOME OF THE STRONGER STORMS COULD PRODUCE SMALL HAIL AND BRIEF HEAVY RAIN...BUT ARE NOT EXPECTED TO BECOME SEVERE. SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY. LESZCYNSKI
Special weather statement, Jun 8, 1:45 PM MDT, 2 hours 26 minutes before
COZ035-038-043-082030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO...CORRECTED 145 PM MDT MON JUN 8 1998 .CORRECTED HEADER... ...STRONG THUNDERSTORMS IN EASTERN LARIMER COUNTY... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS EXTENDING FROM FORT COLLINS TO VIRGINIA DALE. AT 135 PM MDT A WEATHER SPOTTER REPORTED PEA SIZE HAIL OCCURRING AT FORT COLLINS WITH ONE OF THE STORMS. THE STORMS WERE MOVING EAST AT 10 TO 15 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...GREELEY...AULT...EATON...GALETON... HARMONY...LUCERNE...NUNN...PIERCE...PURCELL...SEVERANCE...TIMNATH... WELLINGTON AND WINDSOR SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY WHEN THE STORMS APPROACH. DANGEROUS LIGHTNING...PEA TO MARBLE SIZE HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. COOPER
Special weather statement, Jun 8, 1:45 PM MDT, 2 hours 26 minutes before
COZ035-038-043-082030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO...CORRECTED 145 PM MDT MON JUN 8 1998 .CORRECTED HEADER... ...STRONG THUNDERSTORMS IN EASTERN LARIMER COUNTY... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS EXTENDING FROM FORT COLLINS TO VIRGINIA DALE. AT 135 PM MDT A WEATHER SPOTTER REPORTED PEA SIZE HAIL OCCURRING AT FORT COLLINS WITH ONE OF THE STORMS. THE STORMS WERE MOVING EAST AT 10 TO 15 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...GREELEY...AULT...EATON...GALETON... HARMONY...LUCERNE...NUNN...PIERCE...PURCELL...SEVERANCE...TIMNATH... WELLINGTON AND WINDSOR SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY WHEN THE STORMS APPROACH. DANGEROUS LIGHTNING...PEA TO MARBLE SIZE HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. COOPER
Special weather statement, Jun 8, 1:45 PM MDT, 2 hours 26 minutes before
COZ035-038-043-08230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 145 PM MDT MON JUN 8 1998 ...STRONG THUNDERSTORMS IN EASTERN LARIMER COUNTY... AT 140 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF THUNDERSTORMS EXTENDING FROM FORT COLLINS TO VIRGINIA DALE. AT 135 PM MDT A WEATHER SPOTTER REPORTED PEA SIZE HAIL OCCURRING AT FORT COLLINS WITH ONE OF THE STORMS. THE STORMS WERE MOVING EAST AT 10 TO 15 MILES PER HOUR. PERSONS IN OR NEAR FORT COLLINS...GREELEY...AULT...EATON...GALETON... HARMONY...LUCERNE...NUNN...PIERCE...PURCELL...SEVERANCE...TIMNATH... WELLINGTON AND WINDSOR SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY WHEN THE STORMS APPROACH. DANGEROUS LIGHTNING...PEA TO MARBLE SIZE HAIL...BRIEF HEAVY RAIN...AND GUSTY WINDS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. COOPER
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 7, 6:39 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 51 min |
| Jun 8, 2:25 AM MDT | Severe Thunderstorm Warning | BOU | Weld | 35 min |
| Jun 8, 3:00 AM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 40 min |
| Jun 8, 3:02 AM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 38 min |
| Jun 8, 4:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Jefferson | 46 min |
| Jun 8, 5:32 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Jefferson | 28 min |
| Jun 8, 5:59 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, Douglas, Jefferson | 31 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.