Alert archive / California / Sonoma County
Weather alerts in Sonoma County, California, 2015
59 weather alerts in 2015, 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 2015. Tap one for its archive.
- Alerts
- 59
- Warnings
- 11
- Watches
- 3
- Advisories
- 29
- Busiest month
- November13 alerts
- Busiest day
- November 26, 20154 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, 2015
| 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 | 0 | 1 | 0% |
Each office's whole area, 2015
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Hanford, CA: tornado warnings | 0 | 1 | 0% | |||
| NWS Hanford, CA: severe thunderstorm warnings | 12 | 1 | 92% | 10 | 20% | 23 min |
| NWS Hanford, CA: flash flood warnings | 24 | 5 | 79% | 15 | 33% | 50 min |
| NWS Phoenix, AZ: tornado warnings | 0 | 3 | 0% | |||
| NWS Phoenix, AZ: severe thunderstorm warnings | 85 | 30 | 65% | 153 | 52% | 15 min |
| NWS Phoenix, AZ: flash flood warnings | 25 | 4 | 84% | 14 | 36% | 79 min |
| NWS San Diego, CA: tornado warnings | 0 | 2 | 0% | |||
| NWS San Diego, CA: severe thunderstorm warnings | 18 | 6 | 67% | 24 | 58% | 30 min |
| NWS San Diego, CA: flash flood warnings | 31 | 19 | 39% | 88 | 60% | 58 min |
| NWS Los Angeles, CA: severe thunderstorm warnings | 9 | 2 | 78% | 4 | 100% | 47 min |
| NWS Los Angeles, CA: flash flood warnings | 40 | 13 | 68% | 40 | 65% | 63 min |
| NWS Medford, OR: severe thunderstorm warnings | 37 | 4 | 89% | 12 | 50% | 15 min |
| NWS Medford, OR: flash flood warnings | 5 | 2 | 60% | 5 | 40% | 49 min |
| NWS San Francisco Bay Area, CA: severe thunderstorm warnings | 1 | 0 | 100% | 0 | ||
| NWS San Francisco Bay Area, CA: flash flood warnings | 0 | 2 | 0% | |||
| NWS Las Vegas, NV: tornado warnings | 0 | 1 | 0% | |||
| NWS Las Vegas, NV: severe thunderstorm warnings | 66 | 16 | 76% | 81 | 43% | 22 min |
| NWS Las Vegas, NV: flash flood warnings | 167 | 91 | 46% | 257 | 72% | 78 min |
| NWS Sacramento, CA: tornado warnings | 6 | 0 | 100% | 9 | 0% | |
| NWS Sacramento, CA: severe thunderstorm warnings | 21 | 3 | 86% | 13 | 38% | 10 min |
| NWS Sacramento, CA: flash flood warnings | 5 | 1 | 80% | 7 | 29% | 114 min |
| NWS Eureka, CA: severe thunderstorm warnings | 5 | 1 | 80% | 1 | 100% | 16 min |
| NWS Eureka, CA: flash flood warnings | 1 | 0 | 100% | 5 | 0% | |
| NWS Reno, NV: tornado warnings | 0 | 3 | 0% | |||
| NWS Reno, NV: severe thunderstorm warnings | 45 | 6 | 87% | 26 | 38% | 11 min |
| NWS Reno, NV: flash flood warnings | 54 | 13 | 76% | 31 | 58% | 66 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 1, 1:41 PM PST | Freeze Warning | MTR | 19 hr |
| Jan 2, 10:42 AM PST | Freeze Warning | MTR | 22 hr |
| Jan 11, 6:14 AM PST | Dense Fog Advisory | MTR | 5 hr |
| Jan 12, 2:13 AM PST | Dense Fog Advisory | MTR | 8 hr |
| Jan 18, 5:00 PM PST | Coastal Flood Statement | MTR | 69 hr |
| Jan 21, 7:20 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Jan 21, 1:43 PM PST | High Surf Advisory | MTR | 4 days |
| Jan 29, 8:06 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Jan 30, 7:46 AM PST | Dense Fog Advisory | MTR | 3 hr |
| Feb 4, 2:59 AM PST | Flash Flood Watch | MTR | 59 hr |
| Feb 4, 1:21 PM PST | Wind Advisory | MTR | 61 hr |
| Feb 7, 2:15 PM PST | Wind Advisory | MTR | 32 hr |
| Feb 8, 10:08 PM PST | Wind Advisory | MTR | 6 hr |
| Feb 10, 1:14 PM PST | Beach Hazards Statement | MTR | 3 days |
| Feb 17, 6:37 AM PST | Coastal Flood Statement | MTR | 62 hr |
| Feb 28, 1:20 PM PST | Special Weather Statement | MTR | 40 min |
| Mar 10, 3:30 AM PDT | Dense Fog Advisory | MTR | 7 hr |
| Apr 2, 1:55 PM PDT | Frost Advisory | MTR | 15 hr |
| Apr 15, 2:33 PM PDT | Beach Hazards Statement | MTR | 54 hr |
| May 2, 1:23 PM PDT | Beach Hazards Statement | MTR | 32 hr |
| Jun 7, 2:36 AM PDT | Heat Advisory | MTR | 41 hr |
| Jun 30, 9:02 AM PDT | Heat Advisory | MTR | 36 hr |
| Jul 29, 6:25 AM PDT | Beach Hazards Statement | MTR | 15 hr |
| Aug 6, 9:50 AM PDT | Red Flag Warning | MTR | 19 hr |
| Aug 15, 7:20 PM PDT | Heat Advisory | MTR | 26 hr |
| Aug 29, 2:51 PM PDT | Beach Hazards Statement | MTR | 30 hr |
| Sep 4, 2:36 PM PDT | Beach Hazards Statement | MTR | 3 days |
| Sep 8, 2:27 AM PDT | Heat Advisory | MTR | 17 hr |
| Sep 8, 2:27 AM PDT | Heat Advisory | MTR | 41 hr |
| Sep 9, 2:33 AM PDT | Heat Advisory | MTR | 40 hr |
| Sep 9, 3:00 AM PDT | Beach Hazards Statement | MTR | 18 hr |
| Sep 9, 10:24 PM PDT | Beach Hazards Statement | MTR | 23 hr |
| Sep 20, 2:43 AM PDT | Heat Advisory | MTR | 17 hr |
| Sep 21, 3:13 AM PDT | Heat Advisory | MTR | 17 hr |
| Oct 9, 3:30 AM PDT | Beach Hazards Statement | MTR | 66 hr |
| Oct 10, 6:10 AM PDT | Dense Fog Advisory | MTR | 3 hr |
| Oct 27, 3:19 AM PDT | Beach Hazards Statement | MTR | 60 hr |
| Nov 4, 1:27 PM PST | Frost Advisory | MTR | 19 hr |
| Nov 10, 2:36 AM PST | Frost Advisory | MTR | 30 hr |
| Nov 11, 2:22 PM PST | Frost Advisory | MTR | 19 hr |
| Nov 12, 1:36 PM PST | Beach Hazards Statement | MTR | 50 hr |
| Nov 14, 5:14 PM PST | Wind Advisory | MTR | 35 hr |
| Nov 23, 1:39 PM PST | Coastal Flood Statement | MTR | 3 days |
| Nov 26, 2:33 AM PST | Freeze Warning | MTR | 30 hr |
| Nov 26, 2:33 AM PST | Freeze Warning | MTR | 54 hr |
| Nov 26, 1:53 PM PST | Frost Advisory | MTR | 19 hr |
| Nov 26, 1:53 PM PST | Frost Advisory | MTR | 43 hr |
| Nov 28, 1:03 PM PST | Frost Advisory | MTR | 20 hr |
| Nov 28, 1:03 PM PST | Freeze Warning | MTR | 20 hr |
| Nov 29, 1:23 PM PST | Freeze Warning | MTR | 20 hr |
| Dec 5, 10:23 PM PST | High Surf Warning | MTR | 54 hr |
| Dec 9, 1:15 PM PST | Coastal Flood Advisory | MTR | 47 hr |
| Dec 9, 1:15 PM PST | High Surf Warning | MTR | 3 days |
| Dec 12, 1:08 PM PST | Wind Advisory | MTR | 25 hr |
| Dec 16, 8:09 AM PST | Beach Hazards Statement | MTR | 10 hr |
| Dec 24, 2:53 AM PST | Freeze Watch | MTR | 24 hr |
| Dec 24, 2:53 AM PST | Freeze Watch | MTR | 48 hr |
| Dec 25, 2:55 AM PST | Freeze Warning | MTR | 30 hr |
| Dec 26, 3:09 AM PST | Freeze Warning | MTR | 30 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 | 1 |
| Flooding | |
| Flash Flood Watch | 1 |
| Heat | |
| Heat Advisory | 8 |
| Cold | |
| Freeze Warning | 8 |
| Freeze Watch | 2 |
| Frost Advisory | 7 |
| Wind and dust | |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
| Coast and beach | |
| High Surf Warning | 2 |
| Coastal Flood Advisory | 1 |
| High Surf Advisory | 1 |
| Beach Hazards Statement | 12 |
| Coastal Flood Statement | 3 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20142016
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.