Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 95, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Jun 22, 1998, 6:12 PM MDT for Morgan County, Colorado. It was in force for 48 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, 6:12 PM MDT (00:12 UTC)
- Expired
- Jun 22, 1998, 7:00 PM MDT
- In force
- 48 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Morgan County, CO
The radar
The Denver radar (KFTG), 68 km from the middle of the area, began a volume at 00:14 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, 6:51 PM MDT | Hail 0.75 | Ft Morgan, 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 nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 0.2 hours before the alert went out and 59 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.
050
WUUS1 KDEN 230013 RRA
SVRDEN
COC087-230100-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
612 PM MDT MON JUN 22 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL MORGAN COUNTY IN NORTHEAST COLORADO
* UNTIL 700 PM MDT
* AT 608 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 4 MILES NORTHWEST OF ADENA...OR ABOUT 14 MILES
SOUTHWEST OF FORT MORGAN...MOVING EAST AT 20 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...ADENA...ADENA SCHOOL AND
TWELVE-MILE CORNER
VERY LARGE HAIL AND HEAVY RAIN IS POSSIBLE WITH THIS SEVERE
THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN
A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. DO NOT DRIVE THROUGH
RUNNING WATER.
LAT...LON 4014 10395 3999 10396 3999 10371 4019 10371
GIMMESTADWhat 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
Special weather statement, Jun 22, 4:45 PM MDT, 1 hour 27 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, 1 hour 27 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
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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 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
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.