Alert archive / Colorado / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 149, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 9, 1998, 3:38 PM MDT for Arapahoe County, Elbert County, Colorado. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 9, 1998, 3:38 PM MDT (21:38 UTC)
- Expired
- Aug 9, 1998, 4:30 PM MDT
- In force
- 52 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Arapahoe County, CO, Elbert County, CO
The radar
The Denver radar (KFTG), 44 km from the middle of the area, began a volume at 21:41 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 nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 9.6 hours before the alert went out and 97 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
- 13 J/kg
- Mixed-layer CIN
- -340 J/kg
- Mixed-layer LCL
- 2304 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Aug 9, 11:15 AM MDT, 4 hours 23 minutes before
COZ030-032>050-100600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT SUN AUG 09 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: MONSOON MOISTURE AROUND WILL BE PLENTY OF FUEL FOR WIDELY SCATTERED THUNDERSTORMS THIS AFTERNOON AND SCATTERED THUNDERSTORMS THIS EVENING. A WEAK DISTURBANCE ALOFT WILL TRIGGER THE STORMS BUT WEAK STEERING WINDS WILL KEEP THE STORMS NEARLY STATIONARY ALLOWING RAIN TO FALL OVER AREAS FOR EXTENDED PERIODS OF TIME. THUS HEAVY RAIN IS POSSIBLE. A FEW OF THE STORMS MAY PRODUCE HAIL TOO. THE STORMS ARE NOT EXPECTED TO BE SEVERE SO SPOTTER ACTIVATION IS NOT ANTICIPATED. TA
Special weather statement, Aug 9, 11:15 AM MDT, 4 hours 23 minutes before
COZ030-032>050-100600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT SUN AUG 09 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: MONSOON MOISTURE AROUND WILL BE PLENTY OF FUEL FOR WIDELY SCATTERED THUNDERSTORMS THIS AFTERNOON AND SCATTERED THUNDERSTORMS THIS EVENING. A WEAK DISTURBANCE ALOFT WILL TRIGGER THE STORMS BUT WEAK STEERING WINDS WILL KEEP THE STORMS NEARLY STATIONARY ALLOWING RAIN TO FALL OVER AREAS FOR EXTENDED PERIODS OF TIME. THUS HEAVY RAIN IS POSSIBLE. A FEW OF THE STORMS MAY PRODUCE HAIL TOO. THE STORMS ARE NOT EXPECTED TO BE SEVERE SO SPOTTER ACTIVATION IS NOT ANTICIPATED. TA
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 6:20 PM MDT | Flash Flood Warning | BOU | Morgan | 85 min |
| Aug 8, 6:25 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 50 min |
| Aug 8, 7:12 PM MDT | Flash Flood Warning | BOU | Morgan | 93 min |
| Aug 8, 8:59 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 31 min |
| Aug 9, 3:35 AM MDT | Flash Flood Warning | BOU | Lincoln | 3 hr |
| Aug 9, 3:38 AM MDT | Flash Flood Warning | BOU | Lincoln | 3 hr |
| Aug 9, 3:02 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 43 min |
| Aug 9, 3:32 PM MDT | Severe Thunderstorm Warning | BOU | Douglas, Elbert | 43 min |
| Aug 9, 3:48 PM MDT | Tornado Warning | BOU | Adams | 27 min |
| Aug 9, 3:57 PM MDT | Tornado Warning | BOU | Morgan, Weld | 48 min |
| Aug 9, 4:01 PM MDT | Severe Thunderstorm Warning | BOU | Washington | 44 min |
| Aug 9, 4:33 PM MDT | Flash Flood Warning | BOU | Adams, Morgan | 117 min |
| Aug 9, 4:43 PM MDT | Tornado Warning | BOU | Adams, Morgan, Weld | 32 min |
| Aug 9, 4:49 PM MDT | Flash Flood Warning | BOU | Washington | 86 min |
| Aug 9, 4:52 PM MDT | Severe Thunderstorm Warning | BOU | Lincoln, Washington | 38 min |
| Aug 9, 5:21 PM MDT | Flash Flood Warning | BOU | Lincoln, Washington | 99 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.