Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2026
11 mesoscale discussions in 2026. 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 2026. Tap one for its archive.
- Mesoscale Discussions
- 11
- Busiest month
- April4 mesoscale discussions
- Busiest day
- February 18, 20262 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 3, 8:39 AM PST | Mesoscale Discussion | SPC | Del Norte, Humboldt | 2 hr |
| Feb 17, 4:20 PM PST | Mesoscale Discussion | SPC | Mono | 115 min |
| Feb 17, 6:51 PM PST | Mesoscale Discussion | SPC | San Luis Obispo, Santa Barbara, Ventura | 3 hr |
| Apr 9, 12:04 PM PDT | Mesoscale Discussion | SPC | Del Norte, Trinity | 116 min |
| Apr 10, 1:48 PM PDT | Mesoscale Discussion | SPC | Amador, Calaveras, Madera, Mariposa, Merced, Sacramento and 1 more | 117 min |
| Apr 21, 11:34 AM PDT | Mesoscale Discussion | SPC | Calaveras, Fresno, Madera, Mariposa, Merced, San Joaquin and 1 more | 116 min |
| Apr 21, 3:52 PM PDT | Mesoscale Discussion | SPC | Fresno, Madera | 113 min |
| May 27, 1:50 PM PDT | Mesoscale Discussion | SPC | Modoc | 85 min |
| Jun 19, 1:21 PM PDT | Mesoscale Discussion | SPC | Alpine | 2 hr |
| Aug 12, 1:41 PM PDT | Mesoscale Discussion | SPC | Imperial | 2 hr |
| Aug 13, 12:24 PM PDT | Mesoscale Discussion | SPC | Mono | 2 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Madera County3
- Del Norte County2
- Mono County2
- Calaveras County2
- Mariposa County2
- Merced County2
- Stanislaus County2
- Fresno County2
- Humboldt County1
- San Luis Obispo County1
- Santa Barbara County1
- Ventura County1
- Trinity County1
- Amador County1
- Sacramento County1
- San Joaquin County1
- Modoc County1
- Alpine County1
- Imperial County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
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.