Alert archive / Colorado / Tornado Warnings in 1998
Tornado Warning 18, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jul 15, 1998, 6:01 PM MDT for Weld County, Colorado. It was in force for 29 min. 2 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 15, 1998, 6:01 PM MDT (00:01 UTC)
- Expired
- Jul 15, 1998, 6:30 PM MDT
- In force
- 29 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Weld County, CO
The radar
The Cheyenne radar (KCYS), 75 km from the middle of the area, began a volume at 00:03 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 |
|---|---|---|---|
| Jul 15, 6:25 PM MDT | Hail 1 | Grover, CO | |
| Jul 15, 6:25 PM MDT | Thunderstorm Wind 56 | Grover, CO | Strong thunderstorm winds to 64 mph (53 kts) and large hail did an undetermined amount of damage to cropland in the area. |
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
N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.0 hours before the alert went out and 325 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.
000
TTAA00 KDEN 160007 COR
TORDEN
COC123-160030-
BULLETIN - EAS ACTIVATION REQUESTED...CORRECTION...
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
601 PM MDT WED JUL 15 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
NORTH CENTRAL WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 630 PM MDT
* AT 558 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM WITH A POSSIBLE TORNADO 3 MILES NORTHWEST OF GROVER...
OR ABOUT 41 MILES NORTHEAST OF GREELEY...MOVING SOUTHEAST AT 30
MILES PER HOUR.
LOCATIONS IN THE WARNING INCLUDE...GROVER AND HEREFORD
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
THUNDERSTORMS MOVING THROUGH NORTH CENTRAL WELD COUNTY MAY ALSO
PRODUCE STRAIGHT LINE WINDS TO 60 MPH...HAIL AND DEADLY LIGHTNING.
BAKER
LAT...LON 4088 10436 4072 10408 4095\ 10395 4100 10422The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 6:16 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Morgan | 29 min |
| Jul 15, 6:47 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Washington | 28 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
Tornado Warnings in Colorado, 1998Every tornado warning in 1998Tornadoes 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.