Alert archive / Colorado / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 116, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this severe thunderstorm warning at Aug 11, 1997, 4:49 PM MDT for Adams County, Arapahoe County, Colorado. It was in force for 41 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 11, 1997, 4:49 PM MDT (22:49 UTC)
- Expired
- Aug 11, 1997, 5:30 PM MDT
- In force
- 41 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Whole counties
Counties Adams County, CO, Arapahoe County, CO
The radar
The Denver radar (KFTG), 18 km from the middle of the area, began a volume at 22:52 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.8 hours before the alert went out and 351 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 521 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 139 m²/s²
- 0-3 km storm-relative helicity
- 230 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 11, 10:51 AM MDT, 5 hours 58 minutes before
COZ030-032>050-120600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT DAY MMM DD 1997 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 WEAK UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE AREA THIS AFTERNOON AND EVENING WHICH WILL BE THE IGNITER FOR SCATTERED SHOWERS AND THUNDERSTORMS. THE BEST TIME FOR THE SHOWERS AND THUNDERSTORMS WILL BE BETWEEN 4 PM AND 9 PM ALONG THE URBAN CORIDOR AND BETWEEN 6 PM AND MIDNIGHT IN THE PLAINS. DONT EXPECT ENOUGH DAYTIME HEATING TO CAUSE REAL UNSTABLE CONDITIONS SO THE STORMS ARE NOT EXPECTED TO BE SEVERE. SPOTTER ACTIVATION IS NOT ANTICIPATED. TA
Special weather statement, Aug 11, 10:51 AM MDT, 5 hours 58 minutes before
COZ030-032>050-120600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT MON AUG 11 1997 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 WEAK UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE AREA THIS AFTERNOON AND EVENING WHICH WILL BE THE IGNITER FOR SCATTERED SHOWERS AND THUNDERSTORMS. THE BEST TIME FOR THE SHOWERS AND THUNDERSTORMS WILL BE BETWEEN 4 PM AND 9 PM ALONG THE URBAN CORIDOR AND BETWEEN 6 PM AND MIDNIGHT IN THE PLAINS. DON'T EXPECT ENOUGH DAYTIME HEATING TO CAUSE REAL UNSTABLE CONDITIONS SO THE STORMS ARE NOT EXPECTED TO BE SEVERE. SPOTTER ACTIVATION IS NOT ANTICIPATED. TA
Special weather statement, Aug 11, 11:15 AM MDT, 5 hours 34 minutes before
COZ030-032>050-120600- SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO NATIONAL WEATHER SERVICE DENVER CO 1115 AM MDT MON AUG 11 1997 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 WEAK UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE AREA THIS AFTERNOON AND EVENING WHICH WILL BE THE IGNITER FOR SCATTERED SHOWERS AND THUNDERSTORMS. THE BEST TIME FOR THE SHOWERS AND THUNDERSTORMS WILL BE BETWEEN 4 PM AND 9 PM ALONG THE URBAN CORIDOR AND BETWEEN 6 PM AND MIDNIGHT IN THE PLAINS. DONT EXPECT ENOUGH DAYTIME HEATING TO CAUSE REAL UNSTABLE CONDITIONS SO THE STORMS ARE NOT EXPECTED TO BE SEVERE. 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 11, 3:12 PM MDT | Severe Thunderstorm Warning | BOU | Denver, Jefferson | 48 min |
| Aug 11, 3:40 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 35 min |
| Aug 11, 4:32 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 43 min |
| Aug 11, 5:42 PM MDT | Severe Thunderstorm Warning | BOU | Elbert | 33 min |
Nearby
Severe Thunderstorm Warnings in Colorado, 1997Every severe thunderstorm warning in 1997
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.