Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2019
9 mesoscale discussions in 2019. 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 2019. Tap one for its archive.
- Mesoscale Discussions
- 9
- Busiest month
- February3 mesoscale discussions
- Busiest day
- February 3, 20191 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 3, 1:18 PM PST | Mesoscale Discussion | SPC | Alpine, El Dorado, Nevada, Placer, Sierra, Tuolumne | 6 hr |
| Feb 9, 6:15 PM PST | Mesoscale Discussion | SPC | Butte, El Dorado, Nevada, Placer, Tuolumne | 4 hr |
| Feb 14, 10:50 AM PST | Mesoscale Discussion | SPC | Calaveras, Fresno, Madera, Mariposa, Merced, Stanislaus and 1 more | 115 min |
| Aug 9, 1:00 PM PDT | Mesoscale Discussion | SPC | Siskiyou | 2 hr |
| Aug 10, 11:36 AM PDT | Mesoscale Discussion | SPC | Lassen, Modoc, Shasta, Siskiyou, Tehama, Trinity | 114 min |
| Sep 5, 1:28 PM PDT | Mesoscale Discussion | SPC | Modoc | 3 hr |
| Sep 25, 3:48 PM PDT | Mesoscale Discussion | SPC | Imperial | 87 min |
| Nov 26, 4:06 PM PST | Mesoscale Discussion | SPC | Shasta, Siskiyou | 6 hr |
| Dec 7, 12:54 PM PST | Mesoscale Discussion | SPC | Butte, Colusa, Glenn, Shasta, Sutter, Tehama and 1 more | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Tuolumne County3
- Siskiyou County3
- Shasta County3
- El Dorado County2
- Nevada County2
- Placer County2
- Butte County2
- Modoc County2
- Tehama County2
- Alpine County1
- Sierra County1
- Calaveras County1
- Fresno County1
- Madera County1
- Mariposa County1
- Merced County1
- Stanislaus County1
- Lassen County1
- Trinity County1
- Imperial County1
- Colusa County1
- Glenn County1
- Sutter County1
- Yuba County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20182020
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.