Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2009
18 mesoscale discussions in 2009. 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 2009. Tap one for its archive.
- Mesoscale Discussions
- 18
- Busiest month
- February6 mesoscale discussions
- Busiest day
- February 16, 20092 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 6, 12:10 PM PST | Mesoscale Discussion | SPC | Los Angeles, Orange | 3 hr |
| Feb 6, 11:03 PM PST | Mesoscale Discussion | SPC | Mono | 3 hr |
| Feb 8, 9:15 PM PST | Mesoscale Discussion | SPC | Alpine, El Dorado, Nevada, Sierra, Tuolumne | 4 hr |
| Feb 14, 4:15 PM PST | Mesoscale Discussion | SPC | Siskiyou, Trinity | 4 hr |
| Feb 16, 8:51 AM PST | Mesoscale Discussion | SPC | Orange | 84 min |
| Feb 16, 9:03 AM PST | Mesoscale Discussion | SPC | Tulare, Tuolumne | 4 hr |
| Mar 3, 8:08 AM PST | Mesoscale Discussion | SPC | Amador, Calaveras, Contra Costa, Merced, Sacramento, San Joaquin and 5 more | 67 min |
| Mar 3, 10:18 AM PST | Mesoscale Discussion | SPC | Nevada, Plumas, Sierra, Tuolumne | 4 hr |
| Mar 21, 7:30 PM PDT | Mesoscale Discussion | SPC | Alpine, El Dorado, Nevada, Placer, Plumas, Sierra and 1 more | 6 hr |
| Jun 3, 12:35 PM PDT | Mesoscale Discussion | SPC | Alpine, Lassen, Modoc, Mono, Plumas, Sierra | 85 min |
| Jun 3, 4:44 PM PDT | Mesoscale Discussion | SPC | Del Norte, Glenn, Shasta, Siskiyou, Tehama, Trinity | 91 min |
| Aug 1, 3:34 PM PDT | Mesoscale Discussion | SPC | Lassen, Modoc, Siskiyou | 56 min |
| Aug 2, 1:18 PM PDT | Mesoscale Discussion | SPC | Siskiyou | 117 min |
| Aug 2, 3:48 PM PDT | Mesoscale Discussion | SPC | Modoc, Siskiyou | 57 min |
| Aug 2, 5:27 PM PDT | Mesoscale Discussion | SPC | Modoc, Siskiyou | 63 min |
| Aug 2, 6:55 PM PDT | Mesoscale Discussion | SPC | Modoc, Siskiyou | 65 min |
| Dec 7, 3:07 AM PST | Mesoscale Discussion | SPC | Amador, Calaveras, Mariposa, Tuolumne | 3 hr |
| Dec 7, 8:44 AM PST | Mesoscale Discussion | SPC | Kern | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Siskiyou County7
- Tuolumne County5
- Modoc County5
- Sierra County4
- Alpine County3
- Nevada County3
- Plumas County3
- Orange County2
- Mono County2
- El Dorado County2
- Trinity County2
- Amador County2
- Calaveras County2
- Lassen County2
- Los Angeles County1
- Tulare County1
- Contra Costa County1
- Merced County1
- Sacramento County1
- San Joaquin County1
- Solano County1
- Stanislaus County1
- Sutter County1
- Yolo County1
- Yuba County1
- Placer County1
- Del Norte County1
- Glenn County1
- Shasta County1
- Tehama County1
- Mariposa County1
- Kern County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20082010
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.