Alert archive / Colorado / 1999
Weather alerts in Colorado, September 1999
55 weather alerts in September 1999, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in September 1999. Tap one for its archive.
- Alerts
- 55
- Warnings
- 52
- Watches
- 3
- Advisories
- 0
- Busiest day
- September 3, 199922 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 1, 2:00 PM MDT | Severe Thunderstorm Watch | SPC | Adams, Arapahoe, Broomfield, Denver, Douglas, Elbert and 8 more | 6 hr |
| Sep 1, 2:12 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 33 min |
| Sep 1, 2:45 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 30 min |
| Sep 1, 3:14 PM MDT | Tornado Warning | BOU | Weld | 31 min |
| Sep 1, 4:40 PM MDT | Tornado Warning | BOU | Weld | 30 min |
| Sep 1, 5:11 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 49 min |
| Sep 1, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 30 min |
| Sep 1, 5:50 PM MDT | Tornado Warning | BOU | Logan | 40 min |
| Sep 1, 6:12 PM MDT | Tornado Warning | BOU | Logan | 18 min |
| Sep 1, 6:29 PM MDT | Severe Thunderstorm Warning | BOU | Larimer | 31 min |
| Sep 1, 6:39 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer, Weld | 36 min |
| Sep 2, 1:44 PM MDT | Severe Thunderstorm Warning | GJT | Archuleta, La Plata | 61 min |
| Sep 2, 2:32 PM MDT | Severe Thunderstorm Warning | GJT | Garfield, Rio Blanco | 58 min |
| Sep 2, 4:31 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer | 44 min |
| Sep 2, 4:43 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 47 min |
| Sep 2, 5:15 PM MDT | Severe Thunderstorm Warning | BOU | Boulder, Larimer, Weld | 30 min |
| Sep 2, 5:31 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 44 min |
| Sep 2, 5:40 PM MDT | Severe Thunderstorm Warning | BOU | Clear Creek, Gilpin, Jefferson | 35 min |
| Sep 2, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Sep 2, 6:13 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 47 min |
| Sep 2, 6:15 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 35 min |
| Sep 2, 6:52 PM MDT | Tornado Warning | BOU | Morgan, Weld | 38 min |
| Sep 2, 7:21 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 29 min |
| Sep 2, 7:30 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Sep 2, 7:46 PM MDT | Tornado Warning | BOU | Weld | 44 min |
| Sep 2, 8:02 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 43 min |
| Sep 2, 8:22 PM MDT | Tornado Warning | BOU | Morgan | 38 min |
| Sep 2, 8:31 PM MDT | Severe Thunderstorm Warning | BOU | Logan, Weld | 44 min |
| Sep 3, 3:31 PM MDT | Severe Thunderstorm Warning | GJT | Garfield | 49 min |
| Sep 3, 3:47 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe, Denver | 43 min |
| Sep 3, 3:47 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 43 min |
| Sep 3, 3:53 PM MDT | Severe Thunderstorm Warning | GJT | Moffat | 62 min |
| Sep 3, 4:15 PM MDT | Tornado Watch | SPC | Adams, Arapahoe, Elbert, Kit Carson, Logan, Morgan and 5 more | 6 hr |
| Sep 3, 4:29 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Weld | 41 min |
| Sep 3, 5:02 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver, Jefferson | 43 min |
| Sep 3, 5:02 PM MDT | Severe Thunderstorm Warning | BOU | Boulder | 43 min |
| Sep 3, 5:13 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 32 min |
| Sep 3, 5:25 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 35 min |
| Sep 3, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Denver | 45 min |
| Sep 3, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Weld | 45 min |
| Sep 3, 5:51 PM MDT | Severe Thunderstorm Warning | BOU | Morgan | 39 min |
| Sep 3, 6:28 PM MDT | Tornado Warning | BOU | Morgan | 32 min |
| Sep 3, 6:32 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 43 min |
| Sep 3, 7:02 PM MDT | Tornado Warning | BOU | Logan, Morgan, Washington | 28 min |
| Sep 3, 7:08 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 52 min |
| Sep 3, 7:33 PM MDT | Tornado Warning | BOU | Logan, Washington | 42 min |
| Sep 3, 8:00 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| Sep 3, 8:15 PM MDT | Tornado Warning | BOU | Logan, Phillips, Sedgwick | 30 min |
| Sep 3, 8:23 PM MDT | Severe Thunderstorm Warning | GLD | Yuma | 62 min |
| Sep 3, 8:48 PM MDT | Tornado Warning | BOU | Phillips, Sedgwick | 27 min |
| Sep 3, 9:15 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 45 min |
| Sep 11, 2:15 PM MDT | Severe Thunderstorm Warning | GLD | Cheyenne | 50 min |
| Sep 11, 3:45 PM MDT | Severe Thunderstorm Watch | SPC | Baca | 5 hr |
| Sep 19, 3:50 PM MDT | Flash Flood Warning | GJT | Mesa | 2 hr |
| Sep 19, 4:10 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 50 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 39 |
| Tornado Warning | 12 |
| Severe Thunderstorm Watch | 2 |
| Tornado Watch | 1 |
| Flooding | |
| Flash Flood Warning | 1 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Weld County27
- Morgan County12
- Logan County9
- Adams County8
- Denver County5
- Phillips County5
- Sedgwick County5
- Larimer County5
- Washington County4
- Boulder County4
- Arapahoe County3
- Yuma County3
- Elbert County2
- Kit Carson County2
- Garfield County2
- Jefferson County2
- Moffat County2
- Mesa County2
- Broomfield County1
- Douglas County1
- Archuleta County1
- La Plata County1
- Rio Blanco County1
- Clear Creek County1
- Gilpin County1
- Cheyenne County1
- Baca County1
Nearby
Alerts in force nowTornadoes on recordThe radar archive19982000
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.