Alert archive / California / Mesoscale Discussions
Mesoscale Discussions in California, 2017
11 mesoscale discussions in 2017. 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 2017. Tap one for its archive.
- Mesoscale Discussions
- 11
- Busiest month
- January4 mesoscale discussions
- Busiest day
- March 21, 20172 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, 1:45 PM PST | Mesoscale Discussion | SPC | Alpine, Nevada, Plumas, Sierra | 6 hr |
| Jan 9, 2:49 PM PST | Mesoscale Discussion | SPC | Del Norte | 86 min |
| Jan 18, 4:16 PM PST | Mesoscale Discussion | SPC | Alpine, Nevada, Plumas, Sierra, Tuolumne | 5 hr |
| Jan 22, 1:43 PM PST | Mesoscale Discussion | SPC | Alameda, Contra Costa, Monterey, Napa, Sacramento, San Benito and 7 more | 2 hr |
| Feb 5, 8:24 PM PST | Mesoscale Discussion | SPC | Alpine | 6 hr |
| Mar 21, 11:45 AM PDT | Mesoscale Discussion | SPC | Del Norte, Humboldt | 3 hr |
| Mar 21, 12:34 PM PDT | Mesoscale Discussion | SPC | Amador, Calaveras, El Dorado, Merced, Nevada, Placer and 4 more | 116 min |
| Jul 24, 1:25 PM PDT | Mesoscale Discussion | SPC | Lassen, Modoc | 3 hr |
| Jul 25, 11:11 AM PDT | Mesoscale Discussion | SPC | Mono | 94 min |
| Sep 6, 2:14 PM PDT | Mesoscale Discussion | SPC | Lassen, Modoc, Plumas, Shasta, Siskiyou | 61 min |
| Sep 8, 2:15 PM PDT | Mesoscale Discussion | SPC | Imperial | 3 hr |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Alpine County3
- Nevada County3
- Plumas County3
- Sierra County2
- Del Norte County2
- Sacramento County2
- San Benito County2
- San Joaquin County2
- Stanislaus County2
- Lassen County2
- Modoc County2
- Tuolumne County1
- Alameda County1
- Contra Costa County1
- Monterey County1
- Napa County1
- San Mateo County1
- Santa Clara County1
- Santa Cruz County1
- Solano County1
- Yolo County1
- Humboldt County1
- Amador County1
- Calaveras County1
- El Dorado County1
- Merced County1
- Placer County1
- Mono County1
- Shasta County1
- Siskiyou County1
- Imperial County1
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20162018
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.