Alert archive / Colorado / Tornado Warnings in 1998
Tornado Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jul 23, 1998, 4:12 PM MDT for Washington County, Colorado. It was in force for 33 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 23, 1998, 4:12 PM MDT (22:12 UTC)
- Expired
- Jul 23, 1998, 4:45 PM MDT
- In force
- 33 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Washington County, CO
The radar
The Denver radar (KFTG), 120 km from the middle of the area, began a volume at 22:11 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 46 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
- 81 J/kg
- Mixed-layer CIN
- -228 J/kg
- Mixed-layer LCL
- 1157 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
657
WFUS1 KDEN 232215 RRA
TORDEN
COC121-232245-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
412 PM MDT THU JUL 23 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
NORTH CENTRAL WASHINGTON COUNTY IN NORTHEAST COLORADO
* UNTIL 445 PM MDT
* AT 411 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM WITH A POSSIBLE TORNADO 8 MILES NORTHEAST OF MIDWAY...
OR ABOUT 11 MILES NORTHWEST OF AKRON...MOVING EAST AT 10 MILES
PER HOUR. A SECOND POSSIBLE TORNADO WAS LOCATED 13 MILES WEST OF
AKRON ALONG THE MORGAN-WASHINGTON LINE.
LOCATIONS IN THE WARNING INCLUDE...AKRON AND MIDWAY
THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.
IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
LAT...LON 4042 10343 4008 10346 4012 10323 4024 10309
4042 10313The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 23, 4:08 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 37 min |
| Jul 23, 4:23 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 22 min |
| Jul 23, 4:41 PM MDT | Tornado Warning | BOU | Morgan, Washington | 34 min |
| Jul 23, 5:11 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe | 2 hr |
| Jul 23, 5:12 PM MDT | Flash Flood Warning | BOU | Morgan, Washington | 2 hr |
| Jul 23, 5:47 PM MDT | Tornado Warning | BOU | Washington | 28 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.