Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2024
12 mesoscale discussions in 2024. 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 mesoscale discussions reaches back to 2003.
Mesoscale Discussions by county
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Mesoscale Discussions
- 12
- Busiest month
- February3 mesoscale discussions
- Busiest day
- February 4, 20242 mesoscale discussions
Over time
By month
The alerts
Every alert, in the order issued. Times are local, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 7:26 PM PST | Mesoscale Discussion | SPC | El Dorado, Placer, Tuolumne | 5 hr |
| Feb 4, 2:29 PM PST | Mesoscale Discussion | SPC | Alpine, Mono, Sierra | 4 hr |
| Feb 4, 2:47 PM PST | Mesoscale Discussion | SPC | San Mateo, Santa Cruz | 58 min |
| Feb 19, 12:51 PM PST | Mesoscale Discussion | SPC | Butte, Sacramento, San Joaquin, Sutter, Yolo, Yuba | 2 hr |
| Feb 29, 4:51 PM PST | Mesoscale Discussion | SPC | Plumas, Sierra | 4 hr |
| Mar 1, 10:46 AM PST | Mesoscale Discussion | SPC | Alpine, Nevada, Sierra | 6 hr |
| Mar 2, 1:16 PM PST | Mesoscale Discussion | SPC | El Dorado, Tuolumne | 5 hr |
| Apr 12, 11:53 AM PDT | Mesoscale Discussion | SPC | Lassen, Modoc, Plumas | 97 min |
| Apr 13, 1:25 PM PDT | Mesoscale Discussion | SPC | Modoc | 3 hr |
| Jul 14, 3:06 PM PDT | Mesoscale Discussion | SPC | Riverside, San Bernardino | 84 min |
| Aug 17, 12:36 PM PDT | Mesoscale Discussion | SPC | Siskiyou | 114 min |
| Aug 17, 3:18 PM PDT | Mesoscale Discussion | SPC | Siskiyou, Trinity | 87 min |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Sierra County3
- El Dorado County2
- Tuolumne County2
- Alpine County2
- Plumas County2
- Modoc County2
- Siskiyou County2
- Placer County1
- Mono County1
- San Mateo County1
- Santa Cruz County1
- Butte County1
- Sacramento County1
- San Joaquin County1
- Sutter County1
- Yolo County1
- Yuba County1
- Nevada County1
- Lassen County1
- Riverside County1
- San Bernardino County1
- Trinity County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20232025
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.