Alert archive / Colorado / Tornado Warnings in 1998
Tornado Warning 11, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this tornado warning at Jun 22, 1998, 9:11 PM MDT for Washington County, Colorado. It was in force for 34 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 22, 1998, 9:11 PM MDT (03:11 UTC)
- Expired
- Jun 22, 1998, 9:45 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Washington County, CO
The radar
The Goodland radar (KGLD), 142 km from the middle of the area, began a volume at 03:10 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 22, 9:36 PM MDT | Hail 1.75 | Otis, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 22, 7:45 PM MDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 3.2 hours before the alert went out and 44 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
- 411 J/kg
- Mixed-layer CIN
- -44 J/kg
- Mixed-layer LCL
- 2892 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 77 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
151
WFUS1 KDEN 230312 RRA
TORDEN
COC121-230345-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DENVER CO
911 PM MDT MON JUN 22 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* TORNADO WARNING FOR...
NORTHEASTERN WASHINGTON COUNTY IN NORTHEAST COLORADO
* UNTIL 945 PM MDT
* AT 910 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM WITH A POSSIBLE TORNADO 4 MILES NORTHWEST OF OTIS...OR
ABOUT 11 MILES EAST OF AKRON...MOVING EAST AT 15 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...OTIS AND PLATNER
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 4029 10305 4012 10310 4006 10280 4026 10279
BARJENBRUCHWhat forecasters said that day
The local office's own words before this tornado 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 22, 4:45 PM MDT, 4 hours 26 minutes before
COZ030-032>050-230600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 445 PM MDT MON JUN 22 1998 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: THE FIRST THUNDERSTORM OF THE DAY HAS CREATED A WIND SHIFT LINE ACROSS THE DENVER METRO AREA. THIS HAS LESSENED THE CHANCE OF SEVERE WEATHER FARTHER NORTH IN THE GREELEY AND FORT COLLINS AREA. THE MAIN AREA FOR THUNDERSTORM DEVELOPMENT FOR THE REST OF THE AFTERNOON WILL BE IN THE AREA BETWEEN DENVER AND LAST CHANCE. FARTHER EAST...THE AIRMASS REMAINS MOIST AND UNSTABLE. ADDITIONAL THUNDERSTORM DEVELOPMENT IS EXPECTED THIS EVENING FROM LAST CHANCE AND NEW RAYMER EAST. HAIL IN THE ONE TO TWO INCH DIAMETER RANGE WILL BE THE MAIN FEATURE OF STORMS THIS EVENING...BUT DAMAGING WINDS...TORNADOES...AND HEAVY RAIN ARE ALSO POSSIBLE. AMATEUR RADIO SPOTTERS HAVE BEEN ACTIVATED IN THE DENVER AREA. YOU CAN REPORT SEVEVRE WEATHER TO YOUR LOCAL LAW ENFORCEMENT OFFICIALS WHO WILL RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE. GIMMESTAD
Special weather statement, Jun 22, 4:45 PM MDT, 4 hours 26 minutes before
COZ030-032>050-230600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 445 PM MDT MON JUN 22 1998 THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES ADAMS ARAPAHOE BOULDER CLEAR CREEK DENVER DOUGLAS ELBERT GILPIN GRAND JACKSON JEFFERSON LARIMER LINCOLN LOGAN MORGAN PARK PHILLIPS SEDGWICK SUMMIT WASHINGTON WELD SYNOPSIS: THE FIRST THUNDERSTORM OF THE DAY HAS CREATED A WIND SHIFT LINE ACROSS THE DENVER METRO AREA. THIS HAS LESSENED THE CHANCE OF SEVERE WEATHER FARTHER NORTH IN THE GREELEY AND FORT COLLINS AREA. THE MAIN AREA FOR THUNDERSTORM DEVELOPMENT FOR THE REST OF THE AFTERNOON WILL BE IN THE AREA BETWEEN DENVER AND LAST CHANCE. FARTHER EAST...THE AIRMASS REMAINS MOIST AND UNSTABLE. ADDITIONAL THUNDERSTORM DEVELOPMENT IS EXPECTED THIS EVENING FROM LAST CHANCE AND NEW RAYMER EAST. HAIL IN THE ONE TO TWO INCH DIAMETER RANGE WILL BE THE MAIN FEATURE OF STORMS THIS EVENING...BUT DAMAGING WINDS...TORNADOES...AND HEAVY RAIN ARE ALSO POSSIBLE. AMATEUR RADIO SPOTTERS HAVE BEEN ACTIVATED IN THE DENVER AREA. YOU CAN REPORT SEVEVRE WEATHER TO YOUR LOCAL LAW ENFORCEMENT OFFICIALS WHO WILL RELAY THE REPORT TO THE NATIONAL WEATHER SERVICE. GIMMESTAD
Local storm report, Jun 22, 8:15 PM MDT, 56 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
815 PM MDT MON JUN 22 1998
...PRELIMINARY STORM REPORT FOR JUNE 22 1998..
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0414 PM 2 N LOCHBOUIE CO 0.75 INCH HAIL
06/22/98 WELD
0522 PM 11 E PROSPECT VALLEY CO 0.75 INCH HAIL
06/22/98 WELD
0651 PM 11 S FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0727 PM WIGGINS CO 76 MPH TSTM WIND GUST
06/22/98 MORGAN MEASURED BY SPOTTER
0730 PM 15 SE FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0756 PM 3 N PROSPECT VALLEY CO 1.50 INCH HAIL
06/22/98 WELD MOSTLY SMALL STONESLocal storm report, Jun 22, 8:15 PM MDT, 56 minutes before
LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
815 PM MDT MON JUN 22 1998
CORRECTED WIND SPEED IN 0727 PM REPORT
...PRELIMINARY STORM REPORT FOR JUNE 22 1998..
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0414 PM 2 N LOCHBOUIE CO 0.75 INCH HAIL
06/22/98 WELD
0522 PM 11 E PROSPECT VALLEY CO 0.75 INCH HAIL
06/22/98 WELD
0651 PM 11 S FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0727 PM WIGGINS CO 67 MPH TSTM WIND GUST
06/22/98 MORGAN MEASURED BY SPOTTER
0730 PM 15 SE FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0756 PM 3 N PROSPECT VALLEY CO 1.50 INCH HAIL
06/22/98 WELD MOSTLY SMALL STONESLocal storm report, Jun 22, 8:15 PM MDT, 56 minutes before
LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
815 PM MDT MON JUN 22 1998
CORRECTED WIND SPEED IN 0727 PM REPORT
...PRELIMINARY STORM REPORT FOR JUNE 22 1998..
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0414 PM 2 N LOCHBOUIE CO 0.75 INCH HAIL
06/22/98 WELD
0522 PM 11 E PROSPECT VALLEY CO 0.75 INCH HAIL
06/22/98 WELD
0651 PM 11 S FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0727 PM WIGGINS CO 67 MPH TSTM WIND GUST
06/22/98 MORGAN MEASURED BY SPOTTER
0730 PM 15 SE FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0756 PM 3 N PROSPECT VALLEY CO 1.50 INCH HAIL
06/22/98 WELD MOSTLY SMALL STONESLocal storm report, Jun 22, 8:15 PM MDT, 56 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
815 PM MDT MON JUN 22 1998
...PRELIMINARY STORM REPORT FOR JUNE 22 1998..
TIME(MDT) .....CITY LOCATION.....STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0414 PM 2 N LOCHBOUIE CO 0.75 INCH HAIL
06/22/98 WELD
0522 PM 11 E PROSPECT VALLEY CO 0.75 INCH HAIL
06/22/98 WELD
0651 PM 11 S FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0727 PM WIGGINS CO 76 MPH TSTM WIND GUST
06/22/98 MORGAN MEASURED BY SPOTTER
0730 PM 15 SE FORT MORGAN CO 0.75 INCH HAIL
06/22/98 MORGAN
0756 PM 3 N PROSPECT VALLEY CO 1.50 INCH HAIL
06/22/98 WELD MOSTLY SMALL STONESThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 22, 6:12 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 48 min |
| Jun 22, 7:00 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 45 min |
| Jun 22, 8:40 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 50 min |
| Jun 22, 10:47 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 43 min |
| Jun 22, 11:27 PM MDT | Flash Flood Warning | BOU | Weld | 3 hr |
| Jun 22, 11:31 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 44 min |
| Jun 23, 12:14 AM MDT | Severe Thunderstorm Warning | BOU | Morgan | 46 min |
| Jun 23, 12:58 AM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 47 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.