Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 121, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jul 15, 1998, 6:47 PM MDT for Adams County, Arapahoe County, Washington County, Colorado. It was in force for 28 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 15, 1998, 6:47 PM MDT (00:47 UTC)
- Expired
- Jul 15, 1998, 7:15 PM MDT
- In force
- 28 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Adams County, CO, Arapahoe County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 68 km from the middle of the area, began a volume at 00:48 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 00:00Z, 0.8 hours before the alert went out and 303 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
- 901 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 2298 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- -20 m²/s²
- 0-3 km storm-relative helicity
- -12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted, in the capitals the NWS used until 2016.
438
WUUS1 KDEN 160050 RRA
SVRDEN
COC001-005-121-160115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
647 PM MDT WED JUL 15 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN ADAMS COUNTY IN NORTHEAST COLORADO
NORTHEASTERN ARAPAHOE COUNTY IN NORTHEAST COLORADO
SOUTHWESTERN WASHINGTON COUNTY IN NORTHEAST COLORADO
* UNTIL 715 PM MDT
* AT 643 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER SHAMROCK...OR ABOUT 24 MILES SOUTH OF FORT
MORGAN...MOVING NORTHEAST AT 15 MILES PER HOUR.
A SECOND STORM WAS LOCATED IN EXTREME SOUTHEAST ADAMS COUNTY. IT
WAS ALSO MOVING 15 MILES AN HOUR TO THE EAST. LOCATIONS IN THE
WARNING INCLUDE...JOLLY RANCH...LAST CHANCE...SHAMROCK AND WOODROW
STORMS WILL CONTAIN LARGE HAIL AND TORRENTIAL RAIN. DAMAGING WINDS
ARE ALSO LIKELY. TAKE COVER AS THESE STORMS MOVE THROUGH YOUR AREA.
LAT...LON 3998 10388 3961 10388 3959 10360 3999 10352
RTGThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 6:01 PM MDT | Tornado Warning | BOU | Weld | 29 min |
| Jul 15, 6:16 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan | 29 min |
| Jul 15, 6:55 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 60 min |
| Jul 15, 7:22 PM MDT | Tornado Warning | BOU | Morgan | 33 min |
| Jul 15, 8:10 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln, Washington | 35 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.