Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 49, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at May 22, 1998, 4:40 PM MDT for Washington County, Colorado. It was in force for 50 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 22, 1998, 4:40 PM MDT (22:40 UTC)
- Expired
- May 22, 1998, 5:30 PM MDT
- In force
- 50 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
County Washington County, CO
The radar
The Denver radar (KFTG), 117 km from the middle of the area, began a volume at 22:43 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 |
|---|---|---|---|
| May 22, 5:21 PM MDT | Hail 0.75 | Akron, 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 |
|---|---|---|---|
| May 22, 1:30 PM MDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 10.7 hours before the alert went out and 11 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
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What 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, 5 hours 16 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, 5 hours 11 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, 2 hours 25 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, 1 hour 26 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, 4:11 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 34 min |
| May 22, 4:30 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Morgan, Washington | 30 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.