Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 47, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 22, 1998, 4:11 PM MDT for Adams County, Colorado. It was in force for 34 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
- May 22, 1998, 4:11 PM MDT (22:11 UTC)
- Expired
- May 22, 1998, 4:45 PM MDT
- In force
- 34 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Adams County, CO
The radar
The Denver radar (KFTG), 46 km from the middle of the area, began a volume at 22:13 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 22, 1:30 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.2 hours before the alert went out and 68 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
- 105 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 747 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 33 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KDEN 222211 RRA
SVRDEN
COC001-222245-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DENVER CO
411 PM MDT FRI MAY 22 1998
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
EASTERN ADAMS COUNTY IN NORTHEAST COLORADO
* UNTIL 445 PM MDT
* AT 401 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM 9 MILES SOUTHWEST OF LEADER...OR ABOUT 36 MILES
SOUTHWEST OF FORT MORGAN...MOVING EAST AT 20 MILES PER HOUR.
* LOCATIONS IN THE WARNING INCLUDE...LEADER AND SHAMROCK
VERY LARGE HAIL 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.
LAT...LON 3995 10426 3976 10426 3983 10373 3997 10378
3999 10388What 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, May 22, 11:24 AM MDT, 4 hours 47 minutes before
COZ036-039-040-221745- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1124 AM MDT FRI MAY 22 1998 ...STRONG THUNDERSTORMS PRODUCING HAIL IN JEFFERSON COUNTY... AT 1108 AM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A THUNDERSTORM 4 MILES NORTH OF BERGEN PARK...OR ABOUT 20 MILES WEST OF DENVER...MOVING NORTHEAST AT 20 MILES PER HOUR. THIS STORM WAS PRODUCING HEAVY RAINS AND HAIL. THE JEFFERSON COUNTY SHERIFFS DEPARTMENT REPORTED HAIL UP TO 5 INCHES DEEP ON INTERSTATE 70 NEAR FLOYD HILL. PERSONS IN OR NEAR ARVADA...EXTREME SOUTHWESTERN BROOMFIELD... GOLDEN...NORTHWESTERN LAKEWOOD...CENTRAL WESTMINSTER...WESTERN WHEAT RIDGE...BERGEN PARK...ELDORADO SPRINGS...EVERGREEN...KITTREDGE... ROCKY FLATS AND WHITE RANCH OPEN SPACE SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER AND MOVE TO A PLACE OF SAFETY IF BAD WEATHER APPROACHES. RJK
Special weather statement, May 22, 11:29 AM MDT, 4 hours 42 minutes before
COZ030-032>050-230600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER COLORADO 1129 AM MDT FRI MAY 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: A FAIRLY MOIST...UNSTABLE...AIRMASS IS NOW IN PLACE OVER THE FORECAST AREA. AT THE SURFACE...DEVELOPING LOW PRESSURE OVER SOUTHERN COLORADO WILL ALLOW AN EASTERLY COMPONENT TO THE WINDS THIS AFTERNOON AND THIS EVENING. THIS WILL CONTINUE TO BRING MOIST UPSLOPE FLOW TO AREAS EAST OF THE CONTINENTAL DIVIDE. IN THE UPPER ATMOSPHERE...STRONG SOUTH-SOUTHWEST FLOW...A STORM SYSTEM CENTERED JUST TO THE NORTHWEST OF COLORADO...AND COOLER AIR ALOFT WILL PROVIDE ADDITIONAL ENHANCEMENT TO THUNDERSTORM DEVELOPMENT. SHOWERS AND THUNDERSTORMS ARE ALREADY DEVELOPING OVER THE FOOTHILLS... PALMER...AND CHEYENNE RIDGES LATE THIS MORNING. SHOWER AND THUNDERSTORM COVERAGE SHOULD BE LIKELY THIS AFTERNOON AND EVENING OVER MOST OF THE PLAINS AND THE FOOTHILLS OF THE FORECAST AREA. SOME POTENTIAL FOR ISOLATED SEVERE THUNDERSTORMS EXISTS IN MOST AREAS OF THE FLATLANDS...WITH TORNADOES...LARGE HAIL...AND HEAVY RAINS THE THREATS. SPOTTER ACTIVATION WILL BE REQUIRED BY 12:30 PM. RJK
Local storm report, May 22, 2:15 PM MDT, 1 hour 56 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
215 PM MDT FRI MAY 22 1998
...PRELIMINARY STORM REPORT FOR MAY 22 1998...
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1237 PM BROOMFIELD CO 1.00 INCH HAIL
05/22/98 ADAMS
1240 PM BROOMFIELD CO 1.50 INCH HAIL
05/22/98 ADAMS HAIL COVERS GROUND
0107 PM BRIGHTON CO 1.00 INCH HAIL
05/22/98 ADAMS
0142 PM HUDSON CO 1.50 INCH HAIL
05/22/98 WELD
0230 PM FT LUPTON CO LIGHTNING DAMAGE
05/22/98 CAUSED HOUSE FIRE
0240 PM 15 N STONEHAM CO .88 INCH HAIL
05/22/98 WELD
HERRALDLocal storm report, May 22, 3:14 PM MDT, 57 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
215 PM MDT FRI MAY 22 1998
...PRELIMINARY STORM REPORT FOR MAY 22 1998...
TIME(MDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
1237 PM BROOMFIELD CO 1.00 INCH HAIL
05/22/98 ADAMS
1240 PM BROOMFIELD CO 1.50 INCH HAIL
05/22/98 ADAMS HAIL COVERS GROUND
0107 PM BRIGHTON CO 1.00 INCH HAIL
05/22/98 ADAMS
0142 PM HUDSON CO 1.50 INCH HAIL
05/22/98 WELD
0230 PM FT LUPTON CO LIGHTNING DAMAGE
05/22/98 CAUSED HOUSE FIRE
0240 PM 15 N STONEHAM CO .88 INCH HAIL
05/22/98 WELD
HERRALDThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 6:13 PM MDT | Tornado Warning | BOU | Phillips, Sedgwick | 22 min |
| May 21, 6:15 PM MDT | Severe Thunderstorm Warning | BOU | Logan | 45 min |
| May 21, 7:27 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 33 min |
| May 21, 8:01 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 39 min |
| May 21, 8:55 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Phillips | 35 min |
| May 21, 10:36 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 34 min |
| May 22, 11:56 AM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson | 34 min |
| May 22, 12:29 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Jefferson, Weld | 46 min |
| May 22, 12:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 46 min |
| May 22, 1:00 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 30 min |
| May 22, 1:10 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer, Weld | 25 min |
| May 22, 1:30 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 45 min |
| May 22, 1:35 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 40 min |
| May 22, 1:41 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 34 min |
| May 22, 2:06 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 39 min |
| May 22, 2:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| May 22, 2:21 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 24 min |
| May 22, 2:45 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| May 22, 2:58 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 32 min |
| May 22, 3:15 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 40 min |
| May 22, 3:21 PM MDT | Tornado Warning | BOU | Adams, Arapahoe | 24 min |
| May 22, 3:55 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Washington | 35 min |
| May 22, 4:30 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 30 min |
| May 22, 4:40 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 50 min |
| May 22, 4:46 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Washington | 44 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.