Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 76, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 8, 1998, 2:25 AM MDT for 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
- Jun 8, 1998, 2:25 AM MDT (08:25 UTC)
- Expired
- Jun 8, 1998, 3:00 AM MDT
- In force
- 35 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), 81 km from the middle of the area, began a volume at 08:27 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, 8.4 hours before the alert went out and 127 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
- 438 J/kg
- Mixed-layer CIN
- -175 J/kg
- Mixed-layer LCL
- 2270 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.9
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 080825 RRA
SVRDEN
COC123-080900-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
225 AM MDT MON JUN 8 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 300 AM MDT
* AT 220 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER PAWNEE BUTTES...OR ABOUT 40 MILES NORTH OF
FORT MORGAN...MOVING NORTHEAST AT 15 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...PAWNEE BUTTES
IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVEREP
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS OVER 60
MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
ENTREKIN
LAT...LON 4092 10416 4073 10399 4077 10360 4099 10363
4101 10392What 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
Local storm report, Jun 7, 8:35 PM MDT, 5 hours 50 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
835 PM MDT SUN JUN 7 1998
...PRELIMINARY STORM REPORT FOR JUNE 7 1998...
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
340 PM 6 NE KARVAL CO 1.00 INCH HAIL
06/07/98 LINCOLN
425 PM 16 SW HUGO CO 1.00 INCH HAIL
06/07/98 LINCOLN
430 PM- 1 NW HUGO CO 1.00 INCH HAIL
445 PM LINCOLN
06/07/98
650 PM 5 N STERLING CO 0.75 INCH HAIL
06/07/98 LOGAN
707 PM ILIFF CO 1.75 INCH HAIL
06/07/98 LOGAN
COOPERThe 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, 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 |
| 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.