Alert archive / California / Orange County

Weather alerts in Orange County, California, 2018

96 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Orange County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts
96
Warnings
18
Watches
15
Advisories
46
Busiest month
January18 alerts
Busiest day
December 6, 20186 alerts

Over time

By month

Warning verification

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

Orange County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings00
Flash flood warnings5340%978%88 min

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS San Diego, CA: tornado warnings010%
NWS San Diego, CA: severe thunderstorm warnings15287%450%24 min
NWS San Diego, CA: flash flood warnings361753%7871%80 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
Dec 31, 9:28 PM PSTDense Fog AdvisorySGX11 hr
Jan 1, 7:00 PM PSTDense Fog AdvisorySGX7 hr
Jan 5, 4:31 PM PSTDense Fog AdvisorySGX10 hr
Jan 6, 10:09 PM PSTFlash Flood WatchSGX70 hr
Jan 7, 8:15 PM PSTWind AdvisorySGX39 hr
Jan 8, 1:37 PM PSTHigh Surf AdvisorySGX52 hr
Jan 9, 4:45 AM PSTAreal Flood AdvisorySGX5 hr
Jan 9, 5:53 AM PSTSpecial Weather StatementSGX37 min
Jan 9, 12:52 PM PSTAreal Flood AdvisorySGX6 hr
Jan 9, 2:54 PM PSTFlash Flood WarningSGX3 hr
Jan 13, 3:09 AM PSTWind AdvisorySGX11 hr
Jan 13, 1:15 PM PSTBeach Hazards StatementSGX18 hr
Jan 14, 7:35 AM PSTHigh Surf AdvisorySGX7 days
Jan 23, 1:35 AM PSTTsunami WatchAAQ3 hr
Jan 23, 3:40 AM PSTWind AdvisorySGX16 hr
Jan 26, 9:53 AM PSTFire Weather WatchSGX4 hr
Jan 26, 2:17 PM PSTRed Flag WarningSGX3 days
Jan 28, 3:14 AM PSTHigh Wind WarningSGX34 hr
Feb 5, 8:56 PM PSTDense Fog AdvisorySGX13 hr
Feb 7, 5:46 AM PSTDense Fog AdvisorySGX3 hr
Feb 8, 2:12 PM PSTFire Weather WatchSGX20 hr
Feb 9, 10:21 AM PSTRed Flag WarningSGX51 hr
Feb 18, 4:47 AM PSTFrost AdvisorySGX3 days
Feb 25, 5:33 PM PSTWinter Weather AdvisorySGX52 hr
Feb 27, 5:18 PM PSTSpecial Weather StatementSGX42 min
Mar 19, 2:55 PM PDTFlash Flood WatchSGX4 days
Mar 26, 12:05 PM PDTWind AdvisorySGX25 hr
Mar 31, 3:41 AM PDTDense Fog AdvisorySGX5 hr
May 21, 1:58 PM PDTBeach Hazards StatementSGX4 days
Jun 8, 1:14 PM PDTHigh Surf AdvisorySGX5 days
Jul 1, 8:51 PM PDTBeach Hazards StatementSGX41 hr
Jul 2, 1:39 PM PDTExcessive Heat WatchSGX61 hr
Jul 3, 1:24 PM PDTHigh Surf AdvisorySGX3 days
Jul 5, 2:40 AM PDTExcessive Heat WarningSGX66 hr
Jul 5, 2:40 AM PDTHeat AdvisorySGX42 hr
Jul 11, 2:47 PM PDTCoastal Flood AdvisorySGX3 days
Jul 19, 4:17 AM PDTExcessive Heat WatchSGX22 hr
Jul 20, 2:13 AM PDTExcessive Heat WarningSGX9 days
Jul 20, 12:51 PM PDTHeat AdvisorySGX6 days
Jul 22, 1:31 AM PDTHigh Surf AdvisorySGX4 days
Aug 3, 1:27 PM PDTExcessive Heat WatchSGX48 hr
Aug 5, 1:05 PM PDTExcessive Heat WarningSGX55 hr
Aug 7, 12:26 PM PDTBeach Hazards StatementSGX4 days
Aug 8, 1:21 PM PDTHeat AdvisorySGX31 hr
Aug 14, 1:38 PM PDTBeach Hazards StatementSGX4 days
Sep 8, 8:30 PM PDTDense Fog AdvisorySGX13 hr
Sep 14, 11:15 AM PDTBeach Hazards StatementSGX33 hr
Sep 27, 1:44 PM PDTBeach Hazards StatementSGX5 days
Sep 28, 12:00 PM PDTHigh Surf AdvisorySGX4 days
Oct 1, 5:24 PM PDTFlash Flood WarningSGX49 min
Oct 4, 2:00 PM PDTBeach Hazards StatementSGX3 days
Oct 5, 6:27 PM PDTHigh Surf AdvisorySGX26 hr
Oct 7, 6:34 PM PDTBeach Hazards StatementSGX7 days
Oct 10, 1:13 PM PDTHigh Surf AdvisorySGX36 hr
Oct 12, 1:35 AM PDTBeach Hazards StatementSGX68 hr
Oct 12, 1:07 PM PDTFire Weather WatchSGX25 hr
Oct 13, 1:44 PM PDTRed Flag WarningSGX3 days
Oct 14, 3:17 AM PDTHigh Wind WatchSGX11 hr
Oct 14, 1:54 PM PDTHigh Wind WarningSGX25 hr
Oct 17, 2:26 PM PDTFire Weather WatchSGX19 hr
Oct 18, 9:45 AM PDTRed Flag WarningSGX36 hr
Oct 25, 7:14 AM PDTDense Fog AdvisorySGX3 hr
Oct 27, 1:53 AM PDTDense Fog AdvisorySGX8 hr
Oct 27, 9:12 PM PDTDense Fog AdvisorySGX13 hr
Oct 29, 5:19 AM PDTDense Fog AdvisorySGX5 hr
Oct 31, 2:51 AM PDTWind AdvisorySGX7 hr
Nov 4, 5:17 AM PSTDense Fog AdvisorySGX54 min
Nov 4, 7:06 PM PSTDense Fog AdvisorySGX13 hr
Nov 6, 11:28 AM PSTFire Weather WatchSGX22 hr
Nov 7, 9:52 AM PSTRed Flag WarningSGX60 hr
Nov 7, 12:42 PM PSTHigh Wind WarningSGX53 hr
Nov 9, 1:00 PM PSTFire Weather WatchSGX18 hr
Nov 10, 6:57 AM PSTRed Flag WarningSGX4 days
Nov 10, 2:58 PM PSTHigh Wind WarningSGX3 days
Nov 25, 5:00 PM PSTBeach Hazards StatementSGX33 hr
Nov 27, 1:41 AM PSTHigh Surf AdvisorySGX4 days
Nov 27, 12:47 PM PSTFlash Flood WatchSGX61 hr
Nov 28, 3:34 AM PSTWind AdvisorySGX47 hr
Nov 29, 7:57 AM PSTAreal Flood AdvisorySGX4 hr
Nov 29, 9:06 AM PSTFlash Flood WarningSGX3 hr
Nov 29, 9:56 AM PSTAreal Flood AdvisorySGX3 hr
Nov 29, 4:57 PM PSTAreal Flood AdvisorySGX3 hr
Dec 1, 1:16 PM PSTBeach Hazards StatementSGX29 hr
Dec 6, 9:11 AM PSTFlash Flood WatchSGX15 hr
Dec 6, 9:29 AM PSTAreal Flood AdvisorySGX3 hr
Dec 6, 11:19 AM PSTFlash Flood WarningSGX3 hr
Dec 6, 12:29 PM PSTAreal Flood AdvisorySGX3 hr
Dec 6, 1:05 PM PSTFlash Flood WarningSGX3 hr
Dec 6, 3:17 PM PSTAreal Flood AdvisorySGX3 hr
Dec 14, 1:13 PM PSTBeach Hazards StatementSGX24 hr
Dec 15, 1:03 PM PSTHigh Surf AdvisorySGX6 days
Dec 21, 12:06 PM PSTBeach Hazards StatementSGX22 hr
Dec 23, 1:59 AM PSTDense Fog AdvisorySGX7 hr
Dec 23, 5:30 PM PSTWind AdvisorySGX47 hr
Dec 23, 7:20 PM PSTBeach Hazards StatementSGX51 hr
Dec 27, 4:12 AM PSTWind AdvisorySGX57 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 archive20172019

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.