Mesoscale Discussions in California
368 mesoscale discussions since 1986. 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 since 1986. Tap one for its archive.
- Mesoscale Discussions
- 368
- Busiest year
- 200536 mesoscale discussions
- Average year
- 15over 24 years on file
Over time
By year
Mesoscale discussions are counted from 2003.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Tuolumne County82
- Nevada County72
- Sierra County72
- El Dorado County69
- Alpine County68
- Plumas County62
- Placer County61
- Siskiyou County56
- Mariposa County45
- Trinity County40
- Imperial County40
- Amador County40
- Calaveras County37
- Sacramento County36
- Shasta County36
- San Joaquin County36
- Stanislaus County35
- Madera County34
- Riverside County34
- Merced County33
- Lassen County31
- Modoc County31
- Ventura County31
- Sutter County30
- Orange County30
- Fresno County29
- Yolo County28
- Yuba County28
- Tehama County28
- Butte County26
- San Bernardino County25
- San Diego County23
- Tulare County22
- Glenn County22
- Colusa County22
- Mono County21
- Solano County20
- Santa Cruz County20
- Los Angeles County19
- Contra Costa County18
18 more counties
- Alameda County17
- Santa Clara County16
- Kern County15
- Kings County15
- San Mateo County15
- San Benito County15
- Santa Barbara County15
- Del Norte County14
- Napa County12
- Monterey County12
- San Luis Obispo County10
- Inyo County10
- Humboldt County10
- Marin County9
- Lake County8
- Sonoma County5
- Mendocino County4
- City and County of San Francisco1
The latest mesoscale discussions
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 12:24 PM PDT | Mesoscale Discussion | SPC | Mono | 2 hr |
| Aug 12, 1:41 PM PDT | Mesoscale Discussion | SPC | Imperial | 2 hr |
| Jun 19, 1:21 PM PDT | Mesoscale Discussion | SPC | Alpine | 2 hr |
| May 27, 1:50 PM PDT | Mesoscale Discussion | SPC | Modoc | 85 min |
| Apr 21, 3:52 PM PDT | Mesoscale Discussion | SPC | Fresno, Madera | 113 min |
| Apr 21, 11:34 AM PDT | Mesoscale Discussion | SPC | Calaveras, Fresno, Madera, Mariposa, Merced, San Joaquin and 1 more | 116 min |
| Apr 10, 1:48 PM PDT | Mesoscale Discussion | SPC | Amador, Calaveras, Madera, Mariposa, Merced, Sacramento and 1 more | 117 min |
| Apr 9, 12:04 PM PDT | Mesoscale Discussion | SPC | Del Norte, Trinity | 116 min |
| Feb 17, 6:51 PM PST | Mesoscale Discussion | SPC | San Luis Obispo, Santa Barbara, Ventura | 3 hr |
| Feb 17, 4:20 PM PST | Mesoscale Discussion | SPC | Mono | 115 min |
| Jan 3, 8:39 AM PST | Mesoscale Discussion | SPC | Del Norte, Humboldt | 2 hr |
Nearby
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.