Alert archive / California / Napa County

Weather alerts in Napa County, California, 2025

119 weather alerts in 2025, 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 2025. Tap one for its archive.

Alerts: 119
Warnings: 9
Watches: 8
Advisories: 97
Busiest month: January28 alerts
Busiest day: January 6, 20254 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, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	0			0
Severe thunderstorm warnings	0			1	0%
Flash flood warnings	2	0	100%	14	0%

Each office's whole area, 2025

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS San Francisco Bay Area, CA: tornado warnings	2	0	100%	0
NWS San Francisco Bay Area, CA: severe thunderstorm warnings	28	9	68%	39	36%	12 min
NWS San Francisco Bay Area, CA: flash flood warnings	8	5	38%	89	12%	172 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 6, 1:40 AM PST	Dense Fog Advisory	MTR	8 hr
Jan 6, 7:17 AM PST	Wind Advisory	MTR	51 hr
Jan 6, 9:54 AM PST	Dense Fog Advisory	MTR	2 hr
Jan 6, 11:55 AM PST	Dense Fog Advisory	MTR	2 hr
Jan 10, 12:07 AM PST	Wind Advisory	MTR	57 hr
Jan 10, 10:43 AM PST	Coastal Flood Advisory	MTR	25 hr
Jan 11, 11:34 AM PST	Coastal Flood Advisory	MTR	24 hr
Jan 12, 11:18 AM PST	Wind Advisory	MTR	26 hr
Jan 12, 11:36 AM PST	Coastal Flood Advisory	MTR	25 hr
Jan 13, 1:00 PM PST	Frost Advisory	MTR	20 hr
Jan 15, 2:56 PM PST	Frost Advisory	MTR	18 hr
Jan 16, 9:02 AM PST	Frost Advisory	MTR	24 hr
Jan 19, 2:02 AM PST	Wind Advisory	MTR	41 hr
Jan 19, 5:27 AM PST	Dense Fog Advisory	MTR	15 min
Jan 19, 5:42 AM PST	Dense Fog Advisory	MTR	6 hr
Jan 19, 1:31 PM PST	Frost Advisory	MTR	19 hr
Jan 20, 11:29 AM PST	Frost Advisory	MTR	22 hr
Jan 21, 11:26 AM PST	Frost Advisory	MTR	23 hr
Jan 21, 11:26 AM PST	Freeze Warning	MTR	23 hr
Jan 22, 1:44 PM PST	Frost Advisory	MTR	19 hr
Jan 23, 12:12 PM PST	Wind Advisory	MTR	68 hr
Jan 24, 11:07 AM PST	Frost Advisory	MTR	22 hr
Jan 24, 11:07 AM PST	Freeze Watch	MTR	5 days
Jan 25, 2:29 AM PST	Dense Fog Advisory	MTR	7 hr
Jan 26, 10:45 AM PST	Frost Advisory	MTR	22 hr
Jan 27, 11:57 AM PST	Frost Advisory	MTR	21 hr
Jan 28, 10:33 AM PST	Frost Advisory	MTR	22 hr
Jan 30, 9:17 PM PST	Flood Watch	MTR	65 hr
Feb 3, 12:44 AM PST	Flood Watch	MTR	43 hr
Feb 3, 10:23 PM PST	Areal Flood Advisory	MTR	3 hr
Feb 4, 8:44 AM PST	Areal Flood Advisory	MTR	11 hr
Feb 4, 12:54 PM PST	Frost Advisory	MTR	20 hr
Feb 4, 6:57 PM PST	River Flood Warning	MTR	5 hr
Feb 4, 7:05 PM PST	River Flood Warning	MTR	5 hr
Feb 5, 9:57 AM PST	Frost Advisory	MTR	19 hr
Feb 5, 12:36 PM PST	Flood Watch	MTR	41 hr
Feb 6, 4:32 AM PST	Wind Advisory	MTR	20 hr
Feb 7, 12:25 AM PST	Frost Advisory	MTR	33 hr
Feb 7, 12:25 AM PST	Freeze Warning	MTR	33 hr
Feb 7, 11:21 PM PST	Frost Advisory	MTR	34 hr
Feb 7, 11:21 PM PST	Freeze Warning	MTR	34 hr
Feb 8, 11:25 PM PST	Freeze Warning	MTR	34 hr
Feb 9, 11:49 PM PST	Frost Advisory	MTR	33 hr
Feb 11, 9:35 AM PST	Flood Watch	MTR	63 hr
Feb 11, 12:08 PM PST	High Wind Watch	MTR	23 hr
Feb 12, 10:51 AM PST	Wind Advisory	MTR	41 hr
Feb 13, 1:09 AM PST	Areal Flood Advisory	MTR	15 hr
Feb 14, 1:37 AM PST	Frost Advisory	MTR	31 hr
Feb 25, 4:33 AM PST	Dense Fog Advisory	MTR	5 hr
Mar 6, 11:32 AM PST	Frost Advisory	MTR	21 hr
Mar 12, 12:10 AM PDT	Wind Advisory	MTR	20 hr
Mar 15, 12:59 AM PDT	Wind Advisory	MTR	49 hr
Mar 17, 2:21 AM PDT	Frost Advisory	MTR	31 hr
Mar 17, 9:39 AM PDT	Special Weather Statement	MTR	36 min
Mar 18, 1:45 AM PDT	Frost Advisory	MTR	31 hr
Apr 2, 12:42 PM PDT	Frost Advisory	MTR	20 hr
Apr 21, 4:32 AM PDT	Dense Fog Advisory	MTR	4 hr
May 3, 12:20 PM PDT	Wind Advisory	MTR	50 hr
May 8, 6:06 AM PDT	Dense Fog Advisory	MTR	3 hr
May 26, 4:30 PM PDT	Coastal Flood Advisory	MTR	9 hr
May 27, 2:26 AM PDT	Coastal Flood Advisory	MTR	24 hr
May 27, 12:07 PM PDT	Heat Advisory	MTR	3 days
May 30, 12:31 PM PDT	Heat Advisory	MTR	31 hr
Jun 21, 8:47 PM PDT	Coastal Flood Advisory	MTR	27 hr
Jun 22, 11:54 PM PDT	Coastal Flood Advisory	MTR	25 hr
Jun 24, 1:10 AM PDT	Coastal Flood Advisory	MTR	24 hr
Jun 25, 2:10 AM PDT	Coastal Flood Advisory	MTR	24 hr
Jun 26, 2:11 AM PDT	Coastal Flood Advisory	MTR	24 hr
Jul 10, 5:41 AM PDT	Dense Fog Advisory	MTR	3 hr
Jul 21, 2:06 AM PDT	Coastal Flood Advisory	MTR	22 hr
Jul 21, 11:35 PM PDT	Coastal Flood Advisory	MTR	25 hr
Jul 23, 12:57 AM PDT	Coastal Flood Advisory	MTR	25 hr
Jul 24, 1:38 AM PDT	Coastal Flood Advisory	MTR	24 hr
Jul 29, 4:35 PM PDT	Tsunami Advisory	AAQ	39 hr
Aug 19, 12:27 PM PDT	Heat Advisory	MTR	4 days
Sep 10, 1:45 PM PDT	Special Weather Statement	MTR	30 min
Sep 10, 2:37 PM PDT	Areal Flood Advisory	MTR	3 hr
Oct 11, 1:57 AM PDT	Dense Fog Advisory	MTR	8 hr
Oct 13, 2:43 PM PDT	Flash Flood Warning Considerable damage threat	MTR	2 hr
Oct 13, 3:25 PM PDT	Areal Flood Advisory	MTR	3 hr
Oct 16, 2:54 AM PDT	Dense Fog Advisory	MTR	7 hr
Oct 17, 4:33 AM PDT	Dense Fog Advisory	MTR	5 hr
Oct 24, 2:22 AM PDT	Dense Fog Advisory	MTR	8 hr
Nov 1, 6:14 AM PDT	Dense Fog Advisory	MTR	4 hr
Nov 2, 10:40 PM PST	Coastal Flood Advisory	MTR	6 days
Nov 2, 11:59 PM PST	Wind Advisory	MTR	64 hr
Nov 7, 1:42 AM PST	Dense Fog Advisory	MTR	4 hr
Nov 11, 11:24 AM PST	Wind Advisory	MTR	53 hr
Nov 16, 10:57 PM PST	Areal Flood Advisory	MTR	79 min
Nov 16, 11:33 PM PST	Flash Flood Warning Considerable damage threat	MTR	108 min
Nov 17, 12:19 AM PST	Areal Flood Advisory	MTR	3 hr
Nov 24, 10:03 PM PST	Dense Fog Advisory	MTR	13 hr
Nov 25, 9:47 PM PST	Dense Fog Advisory	MTR	10 hr
Nov 26, 9:04 PM PST	Dense Fog Advisory	MTR	10 hr
Nov 30, 6:54 PM PST	Coastal Flood Advisory	MTR	7 days
Dec 3, 5:46 PM PST	Cold Weather Advisory	MTR	38 hr
Dec 5, 8:38 PM PST	Cold Weather Advisory	MTR	4 hr
Dec 12, 5:27 AM PST	Dense Fog Advisory	MTR	6 hr
Dec 12, 8:06 PM PST	Dense Fog Advisory	MTR	15 hr
Dec 13, 9:01 PM PST	Dense Fog Advisory	MTR	14 hr
Dec 14, 8:31 PM PST	Dense Fog Advisory	MTR	14 hr
Dec 17, 5:10 PM PST	Dense Fog Advisory	MTR	18 hr
Dec 19, 2:18 PM PST	Flood Watch	MTR	7 days
Dec 20, 8:27 AM PST	Dense Fog Advisory	MTR	2 hr
Dec 21, 8:49 PM PST	High Wind Watch	MTR	21 hr
Dec 22, 1:02 AM PST	Areal Flood Advisory	MTR	3 hr
Dec 22, 5:59 PM PST	High Wind Warning	MTR	37 hr
Dec 22, 5:59 PM PST	Wind Advisory	MTR	19 hr
Dec 23, 1:09 PM PST	Wind Advisory	MTR	18 hr
Dec 24, 5:08 AM PST	Wind Advisory	MTR	29 hr
Dec 24, 11:46 PM PST	Mesoscale Discussion	SPC	2 hr
Dec 25, 3:20 AM PST	Areal Flood Advisory	MTR	5 hr
Dec 25, 7:56 AM PST	Special Weather Statement	MTR	34 min
Dec 25, 4:11 PM PST	Mesoscale Discussion	SPC	2 hr
Dec 26, 2:27 PM PST	Areal Flood Advisory	MTR	3 hr
Dec 28, 11:13 AM PST	Cold Weather Advisory	MTR	22 hr
Dec 29, 2:38 AM PST	Coastal Flood Advisory	MTR	6 days
Dec 29, 11:36 AM PST	Cold Weather Advisory	MTR	21 hr
Dec 29, 9:04 PM PST	Dense Fog Advisory	MTR	12 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
Mesoscale Discussion	2
Special Weather Statement	3
Flooding
Flash Flood Warning	2
River Flood Warning	2
Flood Watch	5
Areal Flood Advisory	10
Heat
Heat Advisory	3
Cold
Freeze Warning	4
Freeze Watch	1
Cold Weather Advisory	4
Frost Advisory	21
Wind and dust
High Wind Warning	1
High Wind Watch	2
Wind Advisory	15
Fog and smoke
Dense Fog Advisory	26
Coast and beach
Coastal Flood Advisory	17
Tsunami Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2024 2026

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.