Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 82, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 8, 1998, 5:59 PM MDT for 4 counties in Colorado. It was in force for 31 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 8, 1998, 5:59 PM MDT (23:59 UTC)
- Expired
- Jun 8, 1998, 6:30 PM MDT
- In force
- 31 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Arapahoe County, CO, Denver County, CO, Douglas County, CO, Jefferson County, CO
The radar
The Denver radar (KFTG), 49 km from the middle of the area, began a volume at 00:05 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 8, 6:05 PM MDT | Hail 1 | Littleton, 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, 12.0 hours before the alert went out and 159 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.
000
TTAA00 KDEN 082359 RRA
SVRDEN
COC005-031-035-059-090030-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
559 PM MDT MON JUN 8 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTHWESTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
SOUTHWESTERN DENVER COUNTY IN NORTHEAST COLORADO
NORTH CENTRAL DOUGLAS COUNTY IN NORTHEAST COLORADO
EAST CENTRAL JEFFERSON COUNTY IN NORTHEAST COLORADO
* UNTIL 630 PM MDT
* AT 555 PM MDT...THE PUBLIC REPORTED GOLFBALL SIZE HAIL AT
SOUTHWEST PLAZA AT WADSWORTH AND BOWLES.
THE STORM WAS MOVING EAST AT 15 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...SOUTHWESTERN DENVER...
ENGLEWOOD...LITTLETON...CHATFIELD RESERVOIR...GREENWOOD VILLAGE AND
HIGHLANDS RANCH
HAIL UP TO 1 3/4 INCHES IN DIAMETER HAS BEEN REPORTED WITH THIS
STORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A
GARAGE AND MNOVE TO A SUBSTANTIAL SHELTER.
LAT...LON 3966 10514 3954 10518 3945 10495 3966 10487
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, 1:45 PM MDT, 4 hours 14 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, 4 hours 14 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, 4 hours 14 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, 4:11 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 49 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 |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.