Alert archive / California / Merced County

Weather alerts in Merced County, California, 2024

88 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Merced County and its neighbors

Each county as a circle sized by its count in 2024. Tap one for its archive.

Alerts: 88
Warnings: 16
Watches: 13
Advisories: 51
Busiest month: December21 alerts
Busiest day: March 1, 20243 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

0 of 2 tornado warnings covering Merced County in 2024 had a tornado report inside them.

Merced County, 2024

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

Each office's whole area, 2024

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Hanford, CA: tornado warnings	4	0	100%	2	0%
NWS Hanford, CA: severe thunderstorm warnings	10	1	90%	3	33%	9 min
NWS Hanford, CA: flash flood warnings	7	0	100%	9	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
Dec 31, 9:36 PM PST	Dense Fog Advisory	HNX	14 hr
Jan 1, 10:22 PM PST	Dense Fog Advisory	HNX	13 hr
Jan 6, 12:06 AM PST	Freeze Watch	HNX	24 hr
Jan 6, 11:37 PM PST	Freeze Warning	HNX	56 hr
Jan 7, 8:31 AM PST	Dense Fog Advisory	HNX	3 hr
Jan 10, 1:58 AM PST	Freeze Watch	HNX	56 hr
Jan 11, 1:15 AM PST	Freeze Warning	HNX	31 hr
Jan 14, 1:19 PM PST	Dense Fog Advisory	HNX	22 hr
Jan 15, 1:34 PM PST	Dense Fog Advisory	HNX	21 hr
Jan 18, 12:23 AM PST	Dense Fog Advisory	HNX	11 hr
Jan 18, 11:43 PM PST	Dense Fog Advisory	HNX	11 hr
Jan 20, 4:10 PM PST	Special Weather Statement	HNX	35 min
Jan 22, 11:23 PM PST	Dense Fog Advisory	HNX	10 hr
Jan 25, 1:16 AM PST	Dense Fog Advisory	HNX	9 hr
Jan 25, 2:01 PM PST	Dense Fog Advisory	HNX	21 hr
Jan 28, 6:09 AM PST	Dense Fog Advisory	HNX	5 hr
Jan 29, 2:45 PM PST	Dense Fog Advisory	HNX	19 hr
Jan 31, 12:11 AM PST	Wind Advisory	HNX	28 hr
Jan 31, 12:28 PM PST	Flood Watch	HNX	40 hr
Feb 2, 12:20 PM PST	Flood Watch	HNX	4 days
Feb 2, 12:45 PM PST	Wind Advisory	HNX	57 hr
Feb 3, 10:45 AM PST	High Wind Warning	HNX	35 hr
Feb 6, 6:50 AM PST	Areal Flood Advisory	HNX	5 hr
Feb 16, 1:20 PM PST	Flood Watch	HNX	5 days
Feb 17, 1:33 PM PST	Wind Advisory	HNX	53 hr
Feb 19, 2:33 AM PST	Areal Flood Advisory	HNX	5 hr
Feb 20, 4:00 PM PST	Special Weather Statement	HNX	30 min
Feb 20, 5:55 PM PST	Special Weather Statement	HNX	35 min
Feb 29, 1:46 PM PST	High Wind Watch	HNX	12 hr
Mar 1, 1:46 AM PST	High Wind Warning	HNX	42 hr
Mar 1, 3:04 PM PST	Special Weather Statement	HNX	26 min
Mar 1, 3:47 PM PST	Tornado Warning	HNX	28 min
Mar 1, 4:09 PM PST	Tornado Warning	HNX	23 min
Mar 6, 3:59 PM PST	Special Weather Statement	HNX	31 min
Mar 6, 4:28 PM PST	Special Weather Statement	HNX	32 min
Mar 12, 10:00 AM PDT	Wind Advisory	HNX	63 hr
Mar 23, 4:08 PM PDT	Special Weather Statement	HNX	37 min
Mar 28, 1:08 PM PDT	Wind Advisory	HNX	41 hr
Apr 4, 4:53 PM PDT	Special Weather Statement	HNX	22 min
Apr 12, 2:29 AM PDT	Wind Advisory	HNX	40 hr
May 4, 3:53 PM PDT	Areal Flood Advisory	HNX	3 hr
May 31, 11:55 AM PDT	Excessive Heat Watch	HNX	50 hr
Jun 2, 1:47 PM PDT	Excessive Heat Warning	HNX	5 days
Jun 8, 12:07 PM PDT	Excessive Heat Watch	HNX	24 hr
Jun 9, 12:20 PM PDT	Heat Advisory	HNX	4 days
Jun 16, 10:10 AM PDT	Red Flag Warning	HNX	47 hr
Jun 19, 1:45 AM PDT	Excessive Heat Watch	HNX	21 hr
Jun 19, 12:23 PM PDT	Heat Advisory	HNX	6 days
Jun 27, 1:33 PM PDT	Excessive Heat Watch	HNX	37 hr
Jun 29, 2:09 AM PDT	Excessive Heat Warning	HNX	15 days
Jul 4, 10:38 AM PDT	Red Flag Warning	HNX	4 days
Jul 17, 11:56 AM PDT	Excessive Heat Watch	HNX	33 hr
Jul 18, 9:17 PM PDT	Excessive Heat Warning	HNX	7 days
Aug 4, 1:03 AM PDT	Excessive Heat Warning	HNX	4 days
Sep 2, 12:36 PM PDT	Heat Advisory	HNX	5 days
Sep 30, 9:14 AM PDT	Heat Advisory	HNX	7 days
Oct 15, 3:24 AM PDT	Wind Advisory	HNX	4 days
Oct 18, 9:25 AM PDT	Red Flag Warning	HNX	32 hr
Nov 16, 1:08 AM PST	Freeze Warning	HNX	31 hr
Nov 17, 12:57 PM PST	Freeze Watch	HNX	12 hr
Nov 18, 12:56 AM PST	Freeze Warning	HNX	33 hr
Nov 18, 6:20 AM PST	Dense Fog Advisory	HNX	3 hr
Nov 24, 6:31 AM PST	Dense Fog Advisory	HNX	2 hr
Nov 26, 1:55 AM PST	Areal Flood Advisory	HNX	8 hr
Nov 27, 12:43 PM PST	Dense Fog Advisory	HNX	22 hr
Nov 28, 1:27 PM PST	Dense Fog Advisory	HNX	23 hr
Nov 30, 5:41 AM PST	Dense Fog Advisory	HNX	9 hr
Nov 30, 8:47 PM PST	Dense Fog Advisory	HNX	14 hr
Dec 2, 1:32 AM PST	Dense Fog Advisory	HNX	11 hr
Dec 3, 12:30 AM PST	Dense Fog Advisory	HNX	13 hr
Dec 3, 9:39 PM PST	Dense Fog Advisory	HNX	14 hr
Dec 4, 10:31 PM PST	Dense Fog Advisory	HNX	14 hr
Dec 5, 7:58 PM PST	Dense Fog Advisory	HNX	17 hr
Dec 6, 2:10 PM PST	Dense Fog Advisory	HNX	23 hr
Dec 7, 1:54 PM PST	Dense Fog Advisory	HNX	25 hr
Dec 8, 6:33 PM PST	Dense Fog Advisory	HNX	4 hr
Dec 8, 10:40 PM PST	Dense Fog Advisory	HNX	13 hr
Dec 9, 6:07 PM PST	Dense Fog Advisory	HNX	12 hr
Dec 10, 8:02 PM PST	Dense Fog Advisory	HNX	17 hr
Dec 13, 9:02 AM PST	Wind Advisory	HNX	29 hr
Dec 14, 7:17 AM PST	High Wind Warning	HNX	7 hr
Dec 17, 2:08 AM PST	Dense Fog Advisory	HNX	9 hr
Dec 19, 7:52 PM PST	Dense Fog Advisory	HNX	17 hr
Dec 20, 5:12 PM PST	Dense Fog Advisory	HNX	18 hr
Dec 23, 11:33 AM PST	Flood Watch	HNX	27 hr
Dec 24, 10:48 PM PST	Dense Fog Advisory	HNX	12 hr
Dec 27, 9:49 PM PST	Dense Fog Advisory	HNX	13 hr
Dec 29, 9:45 PM PST	Dense Fog Advisory	HNX	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
Tornado Warning	2
Special Weather Statement	8
Flooding
Flood Watch	4
Areal Flood Advisory	4
Heat
Excessive Heat Warning	4
Excessive Heat Watch	5
Heat Advisory	4
Cold
Freeze Warning	4
Freeze Watch	3
Wind and dust
High Wind Warning	3
High Wind Watch	1
Wind Advisory	8
Fire
Red Flag Warning	3
Fog and smoke
Dense Fog Advisory	35

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2023 2025

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.