Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 99, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 22, 1998, 11:31 PM MDT for Morgan County, Weld County, Colorado. It was in force for 44 min. 2 reports 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, 11:31 PM MDT (05:31 UTC)
- Expired
- Jun 23, 1998, 12:15 AM MDT
- In force
- 44 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Morgan County, CO, Weld County, CO
The radar
The Denver radar (KFTG), 72 km from the middle of the area, began a volume at 05:35 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, 11:35 PM MDT | Hail 1 | Orchard, CO | |
| Jun 23, 12:00 AM MDT | Hail 2.75 | Masters, CO | Large hail broke the windshield of a semi-truck. Some crop damage was also reported. |
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, 5.5 hours before the alert went out and 92 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.
812
WUUS1 KDEN 230534 RRA
SVRDEN
COC087-123-230615-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
1131 PM MDT MON JUN 22 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN MORGAN COUNTY IN NORTHEAST COLORADO
EAST CENTRAL WELD COUNTY IN NORTHEAST COLORADO
* UNTIL 1215 AM MDT
* AT 1129 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM OVER GOODRICH...OR ABOUT 17 MILES NORTHWEST OF
FORT MORGAN...MOVING EAST AT 20 MILES PER HOUR. ANOTHER SEVERE STORM
WAS LOCATED 4 MILES NORTH OF ROGGEN...OR ABOUT 18 MILES SOUTHEAST
OF GREELEY.
* LOCATIONS IN THE WARNING INCLUDE...ANTELOPE SPRINGS...GOODRICH...
JACKSON RESERVOIR...ORCHARD...RIVERSIDE RESERVOIR AND WELDONA
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND TORRENTIAL RAIN. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME
OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO
AREAS WHERE WATER COVERS THE ROAD.
LAT...LON 4029 10441 4020 10443 4027 10410 4034 10373
4051 10363 4050 10413
BARJENBRUCHWhat 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 22, 8:15 PM MDT, 3 hours 16 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, 3 hours 16 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, 3 hours 16 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, 3 hours 16 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, 10:10 PM MDT, 1 hour 21 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
1010 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 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 STONES
0936 PM OTIS CO 1.75 INCH HAIL
06/22/98 WASHINGTONThe 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, 9:11 PM MDT | Tornado Warning | BOU | Washington | 34 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 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
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.