Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2015
9 mesoscale discussions in 2015. 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 2015. Tap one for its archive.
- Mesoscale Discussions
- 9
- Busiest month
- February3 mesoscale discussions
- Busiest day
- February 9, 20152 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 8, 1:30 PM PST | Mesoscale Discussion | SPC | Alameda, Butte, Colusa, Contra Costa, Merced, Sacramento and 6 more | 90 min |
| Feb 8, 4:10 PM PST | Mesoscale Discussion | SPC | Amador, Calaveras, Stanislaus | 95 min |
| Feb 8, 9:26 PM PST | Mesoscale Discussion | SPC | Del Norte, Humboldt | 64 min |
| Apr 7, 4:16 PM PDT | Mesoscale Discussion | SPC | Amador, Butte, Calaveras, Colusa, Fresno, Glenn and 9 more | 119 min |
| Jul 8, 3:20 PM PDT | Mesoscale Discussion | SPC | Lassen | 115 min |
| Jul 9, 11:52 AM PDT | Mesoscale Discussion | SPC | Alpine, El Dorado, Placer, Sierra | 113 min |
| Jul 18, 11:53 AM PDT | Mesoscale Discussion | SPC | Imperial | 67 min |
| Oct 15, 3:27 PM PDT | Mesoscale Discussion | SPC | Riverside | 3 hr |
| Dec 13, 1:11 PM PST | Mesoscale Discussion | SPC | Alpine, Amador, Calaveras, El Dorado, Madera, Mariposa and 6 more | 5 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Stanislaus County3
- Amador County3
- Calaveras County3
- Butte County2
- Colusa County2
- Merced County2
- Sacramento County2
- San Joaquin County2
- Sutter County2
- Yolo County2
- Yuba County2
- Madera County2
- Mariposa County2
- Alpine County2
- El Dorado County2
- Placer County2
- Sierra County2
- Alameda County1
- Contra Costa County1
- Solano County1
- Del Norte County1
- Humboldt County1
- Fresno County1
- Glenn County1
- Lassen County1
- Imperial County1
- Riverside County1
- Nevada County1
- Plumas County1
- Tulare County1
- Tuolumne County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20142016
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.