Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2012
16 mesoscale discussions in 2012. 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 2012. Tap one for its archive.
- Mesoscale Discussions
- 16
- Busiest month
- April4 mesoscale discussions
- Busiest day
- April 12, 20122 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 |
|---|---|---|---|---|
| Feb 28, 1:49 PM PST | Mesoscale Discussion | SPC | Siskiyou, Trinity | 4 hr |
| Mar 25, 12:48 PM PDT | Mesoscale Discussion | SPC | Santa Barbara, Ventura | 87 min |
| Apr 12, 11:11 AM PDT | Mesoscale Discussion | SPC | Amador, Calaveras, Colusa, Glenn, Humboldt, Sacramento and 7 more | 64 min |
| Apr 12, 3:08 PM PDT | Mesoscale Discussion | SPC | Colusa, Glenn, Merced, Sacramento, San Joaquin, Stanislaus and 3 more | 97 min |
| Apr 13, 10:53 AM PDT | Mesoscale Discussion | SPC | Alameda, Contra Costa, Merced, Napa, Sacramento, San Joaquin and 4 more | 2 hr |
| Apr 23, 1:39 PM PDT | Mesoscale Discussion | SPC | Lassen, Modoc, Plumas, Sierra | 96 min |
| May 14, 4:14 PM PDT | Mesoscale Discussion | SPC | Lassen, Plumas, Shasta, Siskiyou, Trinity | 91 min |
| Jul 14, 2:44 PM PDT | Mesoscale Discussion | SPC | Imperial, Riverside | 61 min |
| Aug 22, 10:43 AM PDT | Mesoscale Discussion | SPC | Riverside | 2 hr |
| Aug 31, 3:00 PM PDT | Mesoscale Discussion | SPC | Mono | 2 hr |
| Sep 10, 12:47 PM PDT | Mesoscale Discussion | SPC | Riverside, San Bernardino, San Diego | 118 min |
| Oct 22, 1:48 PM PDT | Mesoscale Discussion | SPC | Butte, Colusa, Glenn, Sacramento, Sutter, Tehama and 1 more | 117 min |
| Nov 29, 4:19 AM PST | Mesoscale Discussion | SPC | Del Norte, Humboldt | 86 min |
| Nov 29, 5:08 PM PST | Mesoscale Discussion | SPC | Del Norte, Humboldt | 3 hr |
| Dec 16, 12:39 PM PST | Mesoscale Discussion | SPC | Nevada, Plumas, Sierra | 6 hr |
| Dec 20, 1:17 PM PST | Mesoscale Discussion | SPC | Siskiyou, Trinity | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Trinity County4
- Sacramento County4
- Yolo County4
- Siskiyou County3
- Colusa County3
- Glenn County3
- Humboldt County3
- San Joaquin County3
- Stanislaus County3
- Sutter County3
- Tehama County3
- Plumas County3
- Riverside County3
- Merced County2
- Lassen County2
- Sierra County2
- Del Norte County2
- Santa Barbara County1
- Ventura County1
- Amador County1
- Calaveras County1
- Yuba County1
- Alameda County1
- Contra Costa County1
- Napa County1
- Santa Clara County1
- Solano County1
- Modoc County1
- Shasta County1
- Imperial County1
- Mono County1
- San Bernardino County1
- San Diego County1
- Butte County1
- Nevada County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.