Alert archive / California / Marin County

Weather alerts in Marin County, California, 2017

89 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Marin County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
89
Warnings
19
Watches
13
Advisories
43
Busiest month
January30 alerts
Busiest day
January 8, 20174 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Marin County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings00
Flash flood warnings5180%1010%127 min

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS San Francisco Bay Area, CA: severe thunderstorm warnings020%
NWS San Francisco Bay Area, CA: flash flood warnings71593%1774%160 min

An office's figures cover every county it serves, including across state lines.

Verified by the Iowa Environmental Mesonet's Cow, which matches each storm-based warning with the local storm reports inside its polygon while it was in force, within 15 km of its edge: a tornado warning counts as verified on a tornado report, a severe thunderstorm warning on hail of 1 inch or more, a gust of 58 mph or more, or wind damage, a flash flood warning on a flash flood report. The false alarm ratio is the share of warnings with no such report; "inside a warning" is the probability of detection, the share of reports that fell inside one; lead time runs from the warning's issue to each report inside it, counting zero for a report that came first. A warning with no report is not proof nothing happened: reports come from spotters, the public and damage surveys, and are thin where few people live.

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.

IssuedProductOfficeLasted
Jan 3, 12:17 PM PSTWind AdvisoryMTR13 hr
Jan 3, 5:31 PM PSTAreal Flood WarningMTR6 hr
Jan 3, 5:43 PM PSTAreal Flood AdvisoryMTR12 hr
Jan 5, 9:16 AM PSTFreeze WarningMTR24 hr
Jan 6, 3:26 AM PSTFlash Flood WatchMTR3 days
Jan 6, 11:26 AM PSTWind AdvisoryMTR55 hr
Jan 8, 1:49 AM PSTAreal Flood AdvisoryMTR3 hr
Jan 8, 6:39 AM PSTAreal Flood AdvisoryMTR3 hr
Jan 8, 9:58 AM PSTAreal Flood AdvisoryMTR2 hr
Jan 8, 12:30 PM PSTAreal Flood AdvisoryMTR3 hr
Jan 9, 2:55 AM PSTCoastal Flood AdvisoryMTR3 days
Jan 9, 3:02 AM PSTHigh Wind WatchMTR11 hr
Jan 9, 2:17 PM PSTWind AdvisoryMTR34 hr
Jan 9, 2:39 PM PSTFlash Flood WatchMTR37 hr
Jan 10, 2:27 PM PSTFlash Flood WarningMTR6 hr
Jan 10, 8:28 PM PSTAreal Flood WarningMTR12 hr
Jan 14, 2:21 PM PSTBeach Hazards StatementMTR31 hr
Jan 17, 3:36 AM PSTWind AdvisoryMTR45 hr
Jan 18, 3:55 PM PSTAreal Flood AdvisoryMTR4 hr
Jan 19, 4:28 AM PSTHigh Surf WarningMTR71 hr
Jan 19, 12:51 PM PSTWind AdvisoryMTR21 hr
Jan 20, 1:26 AM PSTAreal Flood AdvisoryMTR3 hr
Jan 20, 12:51 PM PSTHigh Wind WatchMTR15 hr
Jan 20, 1:27 PM PSTFlash Flood WatchMTR3 days
Jan 21, 4:12 AM PSTHigh Wind WarningMTR29 hr
Jan 21, 4:12 AM PSTWind AdvisoryMTR29 hr
Jan 22, 2:47 AM PSTHigh Surf AdvisoryMTR48 hr
Jan 24, 4:25 AM PSTHigh Surf AdvisoryMTR12 hr
Jan 25, 8:13 AM PSTHigh Surf AdvisoryMTR43 hr
Jan 31, 2:08 AM PSTWind AdvisoryMTR55 hr
Feb 6, 2:25 AM PSTWind AdvisoryMTR35 hr
Feb 6, 9:17 AM PSTFlash Flood WatchMTR31 hr
Feb 7, 7:09 AM PSTFlash Flood WarningMTR4 hr
Feb 8, 1:57 AM PSTWind AdvisoryMTR38 hr
Feb 8, 9:18 AM PSTFlash Flood WatchMTR41 hr
Feb 8, 2:43 PM PSTCoastal Flood WarningMTR21 hr
Feb 9, 11:41 AM PSTFlash Flood WarningMTR7 hr
Feb 9, 12:15 PM PSTFlash Flood WarningMTR6 hr
Feb 15, 1:15 PM PSTHigh Surf AdvisoryMTR27 hr
Feb 16, 1:27 PM PSTWind AdvisoryMTR28 hr
Feb 17, 2:02 PM PSTWind AdvisoryMTR3 hr
Feb 18, 10:06 AM PSTFlood WatchMTR64 hr
Feb 18, 2:23 PM PSTWind AdvisoryMTR60 hr
Feb 19, 1:33 PM PSTHigh Wind WarningMTR37 hr
Feb 20, 7:35 AM PSTAreal Flood AdvisoryMTR3 hr
Feb 20, 8:14 AM PSTFlash Flood WarningMTR4 hr
Feb 20, 10:34 AM PSTAreal Flood AdvisoryMTR3 hr
Feb 20, 1:32 PM PSTAreal Flood AdvisoryMTR3 hr
Feb 25, 2:21 PM PSTBeach Hazards StatementMTR21 hr
Mar 28, 2:31 AM PDTBeach Hazards StatementMTR41 hr
Mar 29, 6:21 PM PDTWind AdvisoryMTR26 hr
Apr 1, 1:42 PM PDTBeach Hazards StatementMTR45 hr
Apr 5, 4:40 AM PDTHigh Wind WatchMTR23 hr
Apr 6, 3:17 AM PDTHigh Wind WarningMTR25 hr
Apr 6, 3:17 AM PDTWind AdvisoryMTR25 hr
Apr 6, 2:20 PM PDTBeach Hazards StatementMTR49 hr
Apr 7, 1:08 PM PDTFrost AdvisoryMTR43 hr
May 5, 12:14 PM PDTWind AdvisoryMTR22 hr
May 6, 8:49 PM PDTHigh Surf AdvisoryMTR17 hr
Jun 11, 4:52 PM PDTSpecial Weather StatementMTR23 min
Jun 13, 12:56 PM PDTExcessive Heat WatchMTR48 hr
Jun 15, 12:51 PM PDTHeat AdvisoryMTR8 days
Jul 7, 5:52 PM PDTHeat AdvisoryMTR27 hr
Jul 10, 7:38 PM PDTBeach Hazards StatementMTR60 hr
Jul 13, 12:58 PM PDTHeat AdvisoryMTR3 days
Jul 29, 1:19 AM PDTBeach Hazards StatementMTR67 hr
Aug 25, 8:03 AM PDTHeat AdvisoryMTR4 days
Aug 29, 7:47 AM PDTExcessive Heat WatchMTR30 hr
Aug 30, 1:27 PM PDTExcessive Heat WarningMTR4 days
Aug 30, 1:27 PM PDTHeat AdvisoryMTR32 hr
Aug 30, 1:27 PM PDTHeat AdvisoryMTR47 hr
Sep 2, 9:16 PM PDTHeat AdvisoryMTR24 hr
Sep 18, 2:06 PM PDTBeach Hazards StatementMTR55 hr
Oct 5, 12:36 PM PDTBeach Hazards StatementMTR4 days
Oct 6, 9:49 AM PDTRed Flag WarningMTR4 days
Oct 6, 12:44 PM PDTWind AdvisoryMTR68 hr
Oct 12, 5:18 PM PDTRed Flag WarningMTR63 hr
Oct 18, 8:36 AM PDTHigh Surf AdvisoryMTR57 hr
Oct 20, 1:01 PM PDTBeach Hazards StatementMTR32 hr
Oct 26, 11:48 AM PDTBeach Hazards StatementMTR3 days
Nov 14, 10:07 AM PSTFlash Flood WatchMTR41 hr
Nov 22, 5:23 AM PSTDense Fog AdvisoryMTR3 hr
Nov 27, 8:55 PM PSTBeach Hazards StatementMTR48 hr
Nov 29, 9:24 PM PSTBeach Hazards StatementMTR6 hr
Dec 2, 7:01 PM PSTCoastal Flood WarningMTR40 hr
Dec 4, 3:40 AM PSTFreeze WatchMTR23 hr
Dec 5, 3:06 AM PSTFreeze WarningMTR30 hr
Dec 21, 2:09 AM PSTFrost AdvisoryMTR31 hr
Dec 21, 2:09 AM PSTFreeze WarningMTR31 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordForecastThe 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.