Alert archive / Colorado / Severe Thunderstorm Warnings / 1999
Severe Thunderstorm Warnings in Colorado, September 1999
39 severe thunderstorm warnings in September 1999. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.
Severe Thunderstorm Warnings by county
Each county as a circle sized by its count in September 1999. Tap one for its archive.
- Severe Thunderstorm Warnings
- 39
- Busiest day
- September 3, 199918 severe thunderstorm warnings
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, 2:12 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, 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, 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, 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, 8:02 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 43 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, 4:29 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, 6:32 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Weld | 43 min |
| Sep 3, 7:08 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 52 min |
| Sep 3, 8:00 PM MDT | Severe Thunderstorm Warning | BOU | Morgan, Weld | 45 min |
| Sep 3, 8:23 PM MDT | Severe Thunderstorm Warning | GLD | Yuma | 62 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 19, 4:10 PM MDT | Severe Thunderstorm Warning | GJT | Mesa | 50 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Weld County21
- Adams County6
- Morgan County6
- Larimer County5
- Boulder County4
- Denver County4
- Logan County2
- Garfield County2
- Jefferson County2
- Moffat County2
- Archuleta County1
- La Plata County1
- Rio Blanco County1
- Clear Creek County1
- Gilpin County1
- Arapahoe County1
- Yuma County1
- Phillips County1
- Sedgwick County1
- Cheyenne County1
- Mesa 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. Warning verification from the Mesonet's Cow. Rebuilt daily.