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
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 0 | 0 | ||||
| Flash flood warnings | 5 | 3 | 40% | 9 | 78% | 88 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Diego, CA: tornado warnings | 0 | 1 | 0% | |||
| NWS San Diego, CA: severe thunderstorm warnings | 15 | 2 | 87% | 4 | 50% | 24 min |
| NWS San Diego, CA: flash flood warnings | 36 | 17 | 53% | 78 | 71% | 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Dec 31, 9:28 PM PST | Dense Fog Advisory | SGX | 11 hr |
| Jan 1, 7:00 PM PST | Dense Fog Advisory | SGX | 7 hr |
| Jan 5, 4:31 PM PST | Dense Fog Advisory | SGX | 10 hr |
| Jan 6, 10:09 PM PST | Flash Flood Watch | SGX | 70 hr |
| Jan 7, 8:15 PM PST | Wind Advisory | SGX | 39 hr |
| Jan 8, 1:37 PM PST | High Surf Advisory | SGX | 52 hr |
| Jan 9, 4:45 AM PST | Areal Flood Advisory | SGX | 5 hr |
| Jan 9, 5:53 AM PST | Special Weather Statement | SGX | 37 min |
| Jan 9, 12:52 PM PST | Areal Flood Advisory | SGX | 6 hr |
| Jan 9, 2:54 PM PST | Flash Flood Warning | SGX | 3 hr |
| Jan 13, 3:09 AM PST | Wind Advisory | SGX | 11 hr |
| Jan 13, 1:15 PM PST | Beach Hazards Statement | SGX | 18 hr |
| Jan 14, 7:35 AM PST | High Surf Advisory | SGX | 7 days |
| Jan 23, 1:35 AM PST | Tsunami Watch | AAQ | 3 hr |
| Jan 23, 3:40 AM PST | Wind Advisory | SGX | 16 hr |
| Jan 26, 9:53 AM PST | Fire Weather Watch | SGX | 4 hr |
| Jan 26, 2:17 PM PST | Red Flag Warning | SGX | 3 days |
| Jan 28, 3:14 AM PST | High Wind Warning | SGX | 34 hr |
| Feb 5, 8:56 PM PST | Dense Fog Advisory | SGX | 13 hr |
| Feb 7, 5:46 AM PST | Dense Fog Advisory | SGX | 3 hr |
| Feb 8, 2:12 PM PST | Fire Weather Watch | SGX | 20 hr |
| Feb 9, 10:21 AM PST | Red Flag Warning | SGX | 51 hr |
| Feb 18, 4:47 AM PST | Frost Advisory | SGX | 3 days |
| Feb 25, 5:33 PM PST | Winter Weather Advisory | SGX | 52 hr |
| Feb 27, 5:18 PM PST | Special Weather Statement | SGX | 42 min |
| Mar 19, 2:55 PM PDT | Flash Flood Watch | SGX | 4 days |
| Mar 26, 12:05 PM PDT | Wind Advisory | SGX | 25 hr |
| Mar 31, 3:41 AM PDT | Dense Fog Advisory | SGX | 5 hr |
| May 21, 1:58 PM PDT | Beach Hazards Statement | SGX | 4 days |
| Jun 8, 1:14 PM PDT | High Surf Advisory | SGX | 5 days |
| Jul 1, 8:51 PM PDT | Beach Hazards Statement | SGX | 41 hr |
| Jul 2, 1:39 PM PDT | Excessive Heat Watch | SGX | 61 hr |
| Jul 3, 1:24 PM PDT | High Surf Advisory | SGX | 3 days |
| Jul 5, 2:40 AM PDT | Excessive Heat Warning | SGX | 66 hr |
| Jul 5, 2:40 AM PDT | Heat Advisory | SGX | 42 hr |
| Jul 11, 2:47 PM PDT | Coastal Flood Advisory | SGX | 3 days |
| Jul 19, 4:17 AM PDT | Excessive Heat Watch | SGX | 22 hr |
| Jul 20, 2:13 AM PDT | Excessive Heat Warning | SGX | 9 days |
| Jul 20, 12:51 PM PDT | Heat Advisory | SGX | 6 days |
| Jul 22, 1:31 AM PDT | High Surf Advisory | SGX | 4 days |
| Aug 3, 1:27 PM PDT | Excessive Heat Watch | SGX | 48 hr |
| Aug 5, 1:05 PM PDT | Excessive Heat Warning | SGX | 55 hr |
| Aug 7, 12:26 PM PDT | Beach Hazards Statement | SGX | 4 days |
| Aug 8, 1:21 PM PDT | Heat Advisory | SGX | 31 hr |
| Aug 14, 1:38 PM PDT | Beach Hazards Statement | SGX | 4 days |
| Sep 8, 8:30 PM PDT | Dense Fog Advisory | SGX | 13 hr |
| Sep 14, 11:15 AM PDT | Beach Hazards Statement | SGX | 33 hr |
| Sep 27, 1:44 PM PDT | Beach Hazards Statement | SGX | 5 days |
| Sep 28, 12:00 PM PDT | High Surf Advisory | SGX | 4 days |
| Oct 1, 5:24 PM PDT | Flash Flood Warning | SGX | 49 min |
| Oct 4, 2:00 PM PDT | Beach Hazards Statement | SGX | 3 days |
| Oct 5, 6:27 PM PDT | High Surf Advisory | SGX | 26 hr |
| Oct 7, 6:34 PM PDT | Beach Hazards Statement | SGX | 7 days |
| Oct 10, 1:13 PM PDT | High Surf Advisory | SGX | 36 hr |
| Oct 12, 1:35 AM PDT | Beach Hazards Statement | SGX | 68 hr |
| Oct 12, 1:07 PM PDT | Fire Weather Watch | SGX | 25 hr |
| Oct 13, 1:44 PM PDT | Red Flag Warning | SGX | 3 days |
| Oct 14, 3:17 AM PDT | High Wind Watch | SGX | 11 hr |
| Oct 14, 1:54 PM PDT | High Wind Warning | SGX | 25 hr |
| Oct 17, 2:26 PM PDT | Fire Weather Watch | SGX | 19 hr |
| Oct 18, 9:45 AM PDT | Red Flag Warning | SGX | 36 hr |
| Oct 25, 7:14 AM PDT | Dense Fog Advisory | SGX | 3 hr |
| Oct 27, 1:53 AM PDT | Dense Fog Advisory | SGX | 8 hr |
| Oct 27, 9:12 PM PDT | Dense Fog Advisory | SGX | 13 hr |
| Oct 29, 5:19 AM PDT | Dense Fog Advisory | SGX | 5 hr |
| Oct 31, 2:51 AM PDT | Wind Advisory | SGX | 7 hr |
| Nov 4, 5:17 AM PST | Dense Fog Advisory | SGX | 54 min |
| Nov 4, 7:06 PM PST | Dense Fog Advisory | SGX | 13 hr |
| Nov 6, 11:28 AM PST | Fire Weather Watch | SGX | 22 hr |
| Nov 7, 9:52 AM PST | Red Flag Warning | SGX | 60 hr |
| Nov 7, 12:42 PM PST | High Wind Warning | SGX | 53 hr |
| Nov 9, 1:00 PM PST | Fire Weather Watch | SGX | 18 hr |
| Nov 10, 6:57 AM PST | Red Flag Warning | SGX | 4 days |
| Nov 10, 2:58 PM PST | High Wind Warning | SGX | 3 days |
| Nov 25, 5:00 PM PST | Beach Hazards Statement | SGX | 33 hr |
| Nov 27, 1:41 AM PST | High Surf Advisory | SGX | 4 days |
| Nov 27, 12:47 PM PST | Flash Flood Watch | SGX | 61 hr |
| Nov 28, 3:34 AM PST | Wind Advisory | SGX | 47 hr |
| Nov 29, 7:57 AM PST | Areal Flood Advisory | SGX | 4 hr |
| Nov 29, 9:06 AM PST | Flash Flood Warning | SGX | 3 hr |
| Nov 29, 9:56 AM PST | Areal Flood Advisory | SGX | 3 hr |
| Nov 29, 4:57 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Dec 1, 1:16 PM PST | Beach Hazards Statement | SGX | 29 hr |
| Dec 6, 9:11 AM PST | Flash Flood Watch | SGX | 15 hr |
| Dec 6, 9:29 AM PST | Areal Flood Advisory | SGX | 3 hr |
| Dec 6, 11:19 AM PST | Flash Flood Warning | SGX | 3 hr |
| Dec 6, 12:29 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Dec 6, 1:05 PM PST | Flash Flood Warning | SGX | 3 hr |
| Dec 6, 3:17 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Dec 14, 1:13 PM PST | Beach Hazards Statement | SGX | 24 hr |
| Dec 15, 1:03 PM PST | High Surf Advisory | SGX | 6 days |
| Dec 21, 12:06 PM PST | Beach Hazards Statement | SGX | 22 hr |
| Dec 23, 1:59 AM PST | Dense Fog Advisory | SGX | 7 hr |
| Dec 23, 5:30 PM PST | Wind Advisory | SGX | 47 hr |
| Dec 23, 7:20 PM PST | Beach Hazards Statement | SGX | 51 hr |
| Dec 27, 4:12 AM PST | Wind Advisory | SGX | 57 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Special Weather Statement | 2 |
| Flooding | |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 8 |
| Winter | |
| Winter Weather Advisory | 1 |
| Heat | |
| Excessive Heat Warning | 3 |
| Excessive Heat Watch | 3 |
| Heat Advisory | 3 |
| Cold | |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 6 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
| Coast and beach | |
| Tsunami Watch | 1 |
| Coastal Flood Advisory | 1 |
| High Surf Advisory | 10 |
| Beach Hazards Statement | 15 |
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.