Alert archive / California / Mesoscale Discussions

Mesoscale Discussions in California, 2012

16 mesoscale discussions in 2012. 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 2012. Tap one for its archive.

Mesoscale Discussions
16
Busiest month
April4 mesoscale discussions
Busiest day
April 12, 20122 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.

IssuedProductOfficeCountiesLasted
Feb 28, 1:49 PM PSTMesoscale DiscussionSPCSiskiyou, Trinity4 hr
Mar 25, 12:48 PM PDTMesoscale DiscussionSPCSanta Barbara, Ventura87 min
Apr 12, 11:11 AM PDTMesoscale DiscussionSPCAmador, Calaveras, Colusa, Glenn, Humboldt, Sacramento and 7 more64 min
Apr 12, 3:08 PM PDTMesoscale DiscussionSPCColusa, Glenn, Merced, Sacramento, San Joaquin, Stanislaus and 3 more97 min
Apr 13, 10:53 AM PDTMesoscale DiscussionSPCAlameda, Contra Costa, Merced, Napa, Sacramento, San Joaquin and 4 more2 hr
Apr 23, 1:39 PM PDTMesoscale DiscussionSPCLassen, Modoc, Plumas, Sierra96 min
May 14, 4:14 PM PDTMesoscale DiscussionSPCLassen, Plumas, Shasta, Siskiyou, Trinity91 min
Jul 14, 2:44 PM PDTMesoscale DiscussionSPCImperial, Riverside61 min
Aug 22, 10:43 AM PDTMesoscale DiscussionSPCRiverside2 hr
Aug 31, 3:00 PM PDTMesoscale DiscussionSPCMono2 hr
Sep 10, 12:47 PM PDTMesoscale DiscussionSPCRiverside, San Bernardino, San Diego118 min
Oct 22, 1:48 PM PDTMesoscale DiscussionSPCButte, Colusa, Glenn, Sacramento, Sutter, Tehama and 1 more117 min
Nov 29, 4:19 AM PSTMesoscale DiscussionSPCDel Norte, Humboldt86 min
Nov 29, 5:08 PM PSTMesoscale DiscussionSPCDel Norte, Humboldt3 hr
Dec 16, 12:39 PM PSTMesoscale DiscussionSPCNevada, Plumas, Sierra6 hr
Dec 20, 1:17 PM PSTMesoscale DiscussionSPCSiskiyou, Trinity5 hr

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20112013

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.