Alert archive / California / Napa County
Weather alerts in Napa County, California, 2016
36 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Napa County and its neighbors
Each county as a circle sized by its count in 2016. Tap one for its archive.
- Alerts
- 36
- Warnings
- 11
- Watches
- 7
- Advisories
- 17
- Busiest month
- March14 alerts
- Busiest day
- March 6, 20165 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Napa County, 2016
| 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% | 7 | 0% |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS San Francisco Bay Area, CA: tornado warnings | 0 | 2 | 0% | |||
| NWS San Francisco Bay Area, CA: severe thunderstorm warnings | 2 | 0 | 100% | 1 | 0% | |
| NWS San Francisco Bay Area, CA: flash flood warnings | 23 | 3 | 87% | 93 | 17% | 121 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, 2:52 PM PST | Freeze Warning | MTR | 11 hr |
| Jan 5, 2:04 PM PST | Flash Flood Watch | MTR | 28 hr |
| Jan 16, 1:47 PM PST | Flash Flood Watch | MTR | 37 hr |
| Jan 16, 7:40 PM PST | Coastal Flood Warning | MTR | 35 hr |
| Jan 19, 4:23 AM PST | Areal Flood Advisory | MTR | 5 hr |
| Feb 13, 4:31 AM PST | Dense Fog Advisory | MTR | 4 hr |
| Mar 4, 3:14 AM PST | Wind Advisory | MTR | 46 hr |
| Mar 5, 7:28 AM PST | Flash Flood Watch | MTR | 15 hr |
| Mar 5, 4:17 PM PST | Areal Flood Advisory | MTR | 6 hr |
| Mar 5, 9:59 PM PST | Flash Flood Warning | MTR | 3 hr |
| Mar 5, 10:14 PM PST | Flash Flood Watch | MTR | 5 hr |
| Mar 6, 4:57 AM PST | Wind Advisory | MTR | 23 hr |
| Mar 6, 5:16 AM PST | Flash Flood Watch | MTR | 23 hr |
| Mar 9, 3:18 PM PST | Flash Flood Watch | MTR | 4 days |
| Mar 10, 8:35 AM PST | Areal Flood Advisory | MTR | 3 hr |
| Mar 10, 10:05 AM PST | Areal Flood Advisory | MTR | 115 min |
| Mar 10, 11:43 AM PST | Areal Flood Advisory | MTR | 3 hr |
| Mar 10, 3:48 PM PST | River Flood Warning | MTR | 281 days |
| Mar 10, 4:56 PM PST | Areal Flood Advisory | MTR | 4 hr |
| Mar 10, 8:20 PM PST | River Flood Warning | MTR | 24 hr |
| Apr 27, 2:14 PM PDT | Special Weather Statement | MTR | 46 min |
| Sep 23, 10:21 AM PDT | Heat Advisory | MTR | 58 hr |
| Sep 23, 10:21 AM PDT | Heat Advisory | MTR | 3 days |
| Nov 13, 11:04 PM PST | Dense Fog Advisory | MTR | 11 hr |
| Nov 16, 3:32 PM PST | Frost Advisory | MTR | 16 hr |
| Nov 17, 1:24 PM PST | Frost Advisory | MTR | 19 hr |
| Dec 13, 10:00 AM PST | Flash Flood Watch | MTR | 60 hr |
| Dec 14, 6:07 PM PST | Areal Flood Advisory | MTR | 12 hr |
| Dec 15, 10:24 AM PST | Areal Flood Advisory | MTR | 6 hr |
| Dec 15, 3:38 PM PST | Flash Flood Warning | MTR | 3 hr |
| Dec 15, 4:16 PM PST | Areal Flood Advisory | MTR | 3 hr |
| Dec 16, 7:14 AM PST | Freeze Warning | MTR | 25 hr |
| Dec 16, 7:14 AM PST | Freeze Warning | MTR | 49 hr |
| Dec 18, 12:14 PM PST | Freeze Warning | MTR | 20 hr |
| Dec 24, 12:10 PM PST | Freeze Warning | MTR | 20 hr |
| Dec 26, 10:56 PM PST | Freeze Warning | MTR | 10 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 Warning | 2 |
| River Flood Warning | 2 |
| Flash Flood Watch | 7 |
| Areal Flood Advisory | 9 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 6 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.