Alert archive / California / Sonoma County
Weather alerts in Sonoma County, California, 2010
73 weather alerts in 2010, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sonoma County and its neighbors
Each county as a circle sized by its count in 2010. Tap one for its archive.
- Alerts
- 73
- Warnings
- 12
- Watches
- 8
- Advisories
- 49
- Busiest month
- January28 alerts
- Busiest day
- January 19, 20106 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Sonoma County, 2010
| 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 | 2 | 0 | 100% | 1 | 0% |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Francisco Bay Area, CA: tornado warnings | 3 | 0 | 100% | 0 | ||
| NWS San Francisco Bay Area, CA: severe thunderstorm warnings | 6 | 0 | 100% | 9 | 0% | |
| NWS San Francisco Bay Area, CA: flash flood warnings | 2 | 0 | 100% | 1 | 0% |
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 1, 3:23 AM PST | High Surf Advisory | MTR | 34 hr |
| Jan 5, 3:50 AM PST | Dense Fog Advisory | MTR | 5 hr |
| Jan 5, 10:35 PM PST | Dense Fog Advisory | MTR | 10 hr |
| Jan 10, 2:40 AM PST | Dense Fog Advisory | MTR | 7 hr |
| Jan 11, 2:53 AM PST | High Surf Advisory | MTR | 12 hr |
| Jan 11, 2:41 PM PST | Coastal Flood Warning | MTR | 41 hr |
| Jan 11, 2:41 PM PST | High Surf Warning | MTR | 41 hr |
| Jan 17, 2:45 PM PST | Wind Advisory | MTR | 24 hr |
| Jan 17, 6:39 PM PST | High Surf Advisory | MTR | 33 hr |
| Jan 18, 2:46 AM PST | High Surf Warning | MTR | 3 days |
| Jan 18, 9:40 AM PST | Areal Flood Advisory | MTR | 3 hr |
| Jan 18, 2:50 PM PST | Wind Advisory | MTR | 22 hr |
| Jan 18, 9:02 PM PST | Coastal Flood Watch | MTR | 31 hr |
| Jan 18, 11:18 PM PST | High Wind Watch | MTR | 14 hr |
| Jan 19, 4:38 AM PST | Areal Flood Advisory | MTR | 3 hr |
| Jan 19, 12:51 PM PST | High Wind Warning | MTR | 23 hr |
| Jan 19, 2:41 PM PST | Special Weather Statement | MTR | 79 min |
| Jan 19, 3:06 PM PST | Special Weather Statement | MTR | 54 min |
| Jan 20, 4:17 AM PST | Coastal Flood Warning | MTR | 8 hr |
| Jan 20, 5:01 AM PST | Areal Flood Advisory | MTR | 6 hr |
| Jan 20, 9:01 AM PST | Flash Flood Warning | MTR | 119 min |
| Jan 20, 11:06 AM PST | Flash Flood Warning | MTR | 3 hr |
| Jan 21, 2:23 PM PST | High Surf Advisory | MTR | 38 hr |
| Jan 24, 2:37 PM PST | High Surf Advisory | MTR | 33 hr |
| Jan 25, 5:43 AM PST | Areal Flood Advisory | MTR | 9 hr |
| Jan 25, 6:05 PM PST | High Surf Warning | MTR | 6 hr |
| Jan 26, 12:14 AM PST | High Surf Advisory | MTR | 9 hr |
| Jan 31, 5:06 AM PST | Dense Fog Advisory | MTR | 4 hr |
| Feb 11, 2:39 PM PST | High Surf Advisory | MTR | 4 days |
| Feb 13, 7:25 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Feb 13, 9:00 AM PST | High Surf Warning | MTR | 13 hr |
| Feb 14, 5:31 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Feb 16, 4:40 AM PST | Dense Fog Advisory | MTR | 6 hr |
| Feb 17, 5:23 AM PST | Dense Fog Advisory | MTR | 5 hr |
| Feb 18, 7:21 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Feb 26, 2:26 AM PST | Wind Advisory | MTR | 16 hr |
| Feb 26, 1:18 PM PST | Areal Flood Advisory | MTR | 81 min |
| Mar 2, 8:34 PM PST | High Surf Advisory | MTR | 8 hr |
| Mar 29, 4:05 AM PDT | High Surf Advisory | MTR | 3 days |
| Apr 3, 9:59 AM PDT | High Surf Advisory | MTR | 22 hr |
| Apr 4, 3:59 AM PDT | Wind Advisory | MTR | 16 hr |
| Apr 5, 10:09 AM PDT | Frost Advisory | MTR | 16 hr |
| Apr 9, 2:04 PM PDT | High Wind Watch | MTR | 13 hr |
| Apr 10, 3:16 AM PDT | Wind Advisory | MTR | 41 hr |
| Apr 11, 8:14 PM PDT | Special Weather Statement | MTR | 46 min |
| Apr 20, 8:12 PM PDT | Wind Advisory | MTR | 22 hr |
| Apr 21, 6:09 PM PDT | Wind Advisory | MTR | 3 hr |
| Aug 23, 3:45 AM PDT | Excessive Heat Watch | MTR | 8 hr |
| Aug 23, 11:23 AM PDT | Heat Advisory | MTR | 56 hr |
| Oct 23, 7:30 PM PDT | Wind Advisory | MTR | 22 hr |
| Oct 24, 9:18 AM PDT | Areal Flood Advisory | MTR | 6 hr |
| Oct 26, 4:03 AM PDT | Frost Advisory | MTR | 28 hr |
| Nov 1, 1:38 PM PDT | High Surf Advisory | MTR | 49 hr |
| Nov 8, 4:22 AM PST | Frost Advisory | MTR | 25 hr |
| Nov 22, 1:26 PM PST | Freeze Watch | MTR | 14 hr |
| Nov 23, 3:23 AM PST | Freeze Watch | MTR | 23 hr |
| Nov 23, 3:23 AM PST | Freeze Warning | MTR | 30 hr |
| Nov 24, 2:48 AM PST | Frost Advisory | MTR | 30 hr |
| Nov 24, 2:48 AM PST | Freeze Watch | MTR | 24 hr |
| Nov 24, 2:48 AM PST | Freeze Warning | MTR | 30 hr |
| Nov 25, 3:00 AM PST | Frost Advisory | MTR | 30 hr |
| Nov 25, 3:00 AM PST | Freeze Warning | MTR | 30 hr |
| Dec 4, 1:45 PM PST | Wind Advisory | MTR | 30 hr |
| Dec 12, 12:17 AM PST | Dense Fog Advisory | MTR | 5 hr |
| Dec 17, 9:48 PM PST | Wind Advisory | MTR | 8 hr |
| Dec 19, 6:30 AM PST | Areal Flood Advisory | MTR | 3 hr |
| Dec 19, 10:44 PM PST | Special Weather Statement | MTR | 31 min |
| Dec 24, 3:02 AM PST | Wind Advisory | MTR | 37 hr |
| Dec 25, 1:43 PM PST | Areal Flood Advisory | MTR | 2 hr |
| Dec 27, 7:21 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Dec 28, 4:08 AM PST | Flash Flood Watch | MTR | 20 hr |
| Dec 28, 4:28 AM PST | Wind Advisory | MTR | 24 hr |
| Dec 28, 2:46 PM PST | Areal Flood Advisory | MTR | 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 | |
| Special Weather Statement | 4 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 9 |
| Heat | |
| Excessive Heat Watch | 1 |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 3 |
| Freeze Watch | 3 |
| Frost Advisory | 5 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 2 |
| Wind Advisory | 12 |
| Fog and smoke | |
| Dense Fog Advisory | 11 |
| Coast and beach | |
| Coastal Flood Warning | 2 |
| High Surf Warning | 4 |
| Coastal Flood Watch | 1 |
| High Surf Advisory | 11 |
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.