Alert archive / California / Orange County
Weather alerts in Orange County, California, 2010
74 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 74
- Warnings
- 13
- Watches
- 9
- Advisories
- 45
- Busiest month
- January26 alerts
- Busiest day
- January 19, 20107 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 3 tornado warnings covering Orange County in 2010 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 15 minutes after it went out.
Orange County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 2 | 33% | 2 | 100% | 15 min |
| Severe thunderstorm warnings | 1 | 0 | 100% | 6 | 0% | |
| Flash flood warnings | 3 | 1 | 67% | 2 | 0% |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Diego, CA: tornado warnings | 4 | 2 | 50% | 2 | 100% | 15 min |
| NWS San Diego, CA: severe thunderstorm warnings | 15 | 4 | 73% | 18 | 33% | 29 min |
| NWS San Diego, CA: flash flood warnings | 29 | 9 | 69% | 24 | 46% | 84 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 |
|---|---|---|---|
| Jan 13, 11:18 AM PST | Wind Advisory | SGX | 50 hr |
| Jan 14, 9:00 AM PST | High Wind Warning | SGX | 8 hr |
| Jan 17, 1:20 PM PST | Flash Flood Watch | SGX | 30 hr |
| Jan 18, 3:59 AM PST | High Wind Warning | SGX | 15 hr |
| Jan 18, 3:59 AM PST | Wind Advisory | SGX | 15 hr |
| Jan 18, 1:35 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Jan 18, 2:25 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Jan 19, 3:29 AM PST | Wind Advisory | SGX | 15 hr |
| Jan 19, 3:42 AM PST | Flash Flood Watch | SGX | 14 hr |
| Jan 19, 12:02 PM PST | Mesoscale Discussion | SPC | 58 min |
| Jan 19, 12:45 PM PST | Tornado Warning | SGX | 45 min |
| Jan 19, 1:28 PM PST | Tornado Warning | SGX | 22 min |
| Jan 19, 1:54 PM PST | Tornado Warning | SGX | 36 min |
| Jan 19, 2:24 PM PST | Severe Thunderstorm Warning | SGX | 51 min |
| Jan 20, 3:57 AM PST | Wind Advisory | SGX | 17 hr |
| Jan 20, 4:26 AM PST | Flash Flood Watch | SGX | 16 hr |
| Jan 20, 12:03 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Jan 20, 2:55 PM PST | Mesoscale Discussion | SPC | 95 min |
| Jan 20, 4:43 PM PST | Areal Flood Advisory | SGX | 4 hr |
| Jan 21, 3:37 AM PST | Wind Advisory | SGX | 38 hr |
| Jan 21, 4:12 AM PST | Flash Flood Watch | SGX | 38 hr |
| Jan 21, 7:01 AM PST | Areal Flood Advisory | SGX | 8 hr |
| Jan 21, 10:56 AM PST | Flash Flood Warning | SGX | 3 hr |
| Jan 21, 11:51 AM PST | Mesoscale Discussion | SPC | 54 min |
| Jan 21, 6:30 PM PST | Mesoscale Discussion | SPC | 60 min |
| Jan 31, 7:38 AM PST | Dense Fog Advisory | SGX | 74 min |
| Feb 4, 1:22 PM PST | Flash Flood Watch | SGX | 54 hr |
| Feb 8, 1:20 PM PST | Winter Storm Watch | SGX | 13 hr |
| Feb 9, 2:31 AM PST | Winter Weather Advisory | SGX | 31 hr |
| Feb 9, 4:00 AM PST | Flash Flood Watch | SGX | 22 hr |
| Feb 9, 11:27 AM PST | Mesoscale Discussion | SPC | 2 hr |
| Feb 9, 3:01 PM PST | Areal Flood Advisory | SGX | 3 hr |
| Feb 27, 8:11 AM PST | Areal Flood Advisory | SGX | 7 hr |
| Feb 27, 8:12 AM PST | Flash Flood Warning | SGX | 65 min |
| Feb 27, 10:40 AM PST | Mesoscale Discussion | SPC | 3 hr |
| Mar 14, 3:17 AM PDT | Wind Advisory | SGX | 9 hr |
| Mar 16, 3:39 AM PDT | Wind Advisory | SGX | 8 hr |
| Mar 19, 2:15 AM PDT | Wind Advisory | SGX | 11 hr |
| Mar 23, 2:45 AM PDT | Wind Advisory | SGX | 7 hr |
| Mar 26, 9:11 PM PDT | Wind Advisory | SGX | 20 hr |
| Apr 6, 1:07 PM PDT | Wind Advisory | SGX | 24 hr |
| Apr 28, 3:08 AM PDT | Wind Advisory | SGX | 41 hr |
| Sep 30, 7:41 AM PDT | Red Flag Warning | SGX | 14 hr |
| Oct 19, 6:51 AM PDT | Areal Flood Advisory | SGX | 4 hr |
| Oct 19, 10:39 AM PDT | Areal Flood Advisory | SGX | 118 min |
| Oct 19, 2:17 PM PDT | Areal Flood Advisory | SGX | 3 hr |
| Oct 19, 5:22 PM PDT | Areal Flood Advisory | SGX | 3 hr |
| Oct 26, 12:48 PM PDT | Wind Advisory | SGX | 13 hr |
| Oct 27, 2:06 AM PDT | High Wind Warning | SGX | 11 hr |
| Oct 27, 2:06 AM PDT | Wind Advisory | SGX | 16 hr |
| Nov 1, 11:26 PM PDT | Wind Advisory | SGX | 11 hr |
| Nov 10, 1:00 PM PST | High Wind Warning | SGX | 28 hr |
| Nov 10, 1:00 PM PST | Wind Advisory | SGX | 28 hr |
| Nov 11, 5:21 PM PST | Wind Advisory | SGX | 16 hr |
| Nov 12, 8:49 AM PST | Fire Weather Watch | SGX | 6 hr |
| Nov 12, 9:19 AM PST | Wind Advisory | SGX | 28 hr |
| Nov 12, 2:49 PM PST | Red Flag Warning | SGX | 13 hr |
| Nov 14, 2:02 AM PST | Wind Advisory | SGX | 9 hr |
| Nov 24, 1:00 PM PST | Wind Advisory | SGX | 24 hr |
| Nov 28, 1:43 PM PST | Wind Advisory | SGX | 22 hr |
| Dec 19, 4:11 PM PST | Areal Flood Advisory | SGX | 5 hr |
| Dec 19, 9:00 PM PST | Areal Flood Advisory | SGX | 4 hr |
| Dec 20, 4:52 AM PST | Flash Flood Watch | SGX | 61 hr |
| Dec 20, 2:26 PM PST | Areal Flood Advisory | SGX | 6 hr |
| Dec 20, 3:14 PM PST | Wind Advisory | SGX | 10 hr |
| Dec 20, 8:19 PM PST | Areal Flood Advisory | SGX | 6 hr |
| Dec 21, 8:05 AM PST | Areal Flood Advisory | SGX | 12 hr |
| Dec 21, 12:56 PM PST | Wind Advisory | SGX | 24 hr |
| Dec 21, 11:18 PM PST | Areal Flood Advisory | SGX | 6 hr |
| Dec 22, 4:59 AM PST | Areal Flood Advisory | SGX | 8 hr |
| Dec 22, 9:27 AM PST | Flash Flood Warning | SGX | 2 hr |
| Dec 22, 12:37 PM PST | Mesoscale Discussion | SPC | 83 min |
| Dec 22, 12:46 PM PST | Areal Flood Advisory | SGX | 6 hr |
| Dec 29, 2:19 AM PST | Wind Advisory | SGX | 24 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 | |
| Severe Thunderstorm Warning | 1 |
| Tornado Warning | 3 |
| Mesoscale Discussion | 7 |
| Flooding | |
| Flash Flood Warning | 3 |
| Flash Flood Watch | 7 |
| Areal Flood Advisory | 19 |
| Winter | |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 4 |
| Wind Advisory | 24 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.