Alert archive / California / Merced County

Weather alerts in Merced County, California, 2023

143 weather alerts in 2023, 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 2023. Tap one for its archive.

Alerts: 143
Warnings: 36
Watches: 17
Advisories: 59
Busiest month: March44 alerts
Busiest day: August 21, 202311 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 3 tornado warnings covering Merced County in 2023 had a tornado report inside them.

Merced County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning
Tornado warnings	3	0	100%	0
Severe thunderstorm warnings	7	0	100%	0
Flash flood warnings	0			1	0%

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Hanford, CA: tornado warnings	6	0	100%	1	0%
NWS Hanford, CA: severe thunderstorm warnings	24	2	92%	41	24%	15 min
NWS Hanford, CA: flash flood warnings	60	8	87%	59	20%	193 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 3, 2:37 AM PST	Flood Watch	HNX	68 hr
Jan 3, 11:17 AM PST	Wind Advisory	HNX	47 hr
Jan 5, 5:12 AM PST	Areal Flood Advisory	HNX	3 hr
Jan 6, 12:26 AM PST	Dense Fog Advisory	HNX	10 hr
Jan 6, 1:23 AM PST	Flood Watch	HNX	5 days
Jan 6, 12:34 PM PST	Wind Advisory	HNX	45 hr
Jan 8, 1:50 AM PST	River Flood Watch	HNX	17 hr
Jan 8, 10:28 AM PST	High Wind Warning	HNX	36 hr
Jan 8, 10:28 AM PST	Wind Advisory	HNX	30 hr
Jan 8, 6:58 PM PST	River Flood Warning	HNX	62 hr
Jan 9, 9:54 AM PST	Areal Flood Advisory	HNX	13 hr
Jan 9, 10:28 AM PST	Areal Flood Warning	HNX	6 hr
Jan 9, 8:12 PM PST	Areal Flood Warning	HNX	3 hr
Jan 10, 1:08 PM PST	Areal Flood Advisory	HNX	3 hr
Jan 11, 9:00 AM PST	Areal Flood Warning	HNX	8 days
Jan 12, 1:17 PM PST	Flood Watch	HNX	59 hr
Jan 12, 7:49 PM PST	Wind Advisory	HNX	26 hr
Jan 14, 9:27 AM PST	Areal Flood Advisory	HNX	2 hr
Jan 14, 10:32 AM PST	Areal Flood Advisory	HNX	4 hr
Jan 15, 9:26 PM PST	Wind Advisory	HNX	15 hr
Jan 19, 1:00 AM PST	Freeze Watch	HNX	31 hr
Jan 19, 1:00 AM PST	Freeze Warning	HNX	31 hr
Jan 20, 7:45 AM PST	Freeze Warning	HNX	4 days
Jan 20, 9:49 PM PST	Dense Fog Advisory	HNX	12 hr
Jan 21, 9:50 AM PST	Dense Fog Advisory	HNX	25 hr
Jan 22, 4:33 AM PST	Wind Advisory	HNX	31 hr
Jan 23, 11:50 AM PST	Dense Fog Advisory	HNX	19 hr
Jan 25, 12:07 PM PST	Dense Fog Advisory	HNX	21 hr
Jan 28, 12:34 AM PST	Freeze Watch	HNX	47 hr
Jan 28, 6:23 AM PST	Dense Fog Advisory	HNX	5 hr
Jan 29, 11:21 PM PST	Freeze Warning	HNX	58 hr
Jan 30, 6:00 AM PST	Dense Fog Advisory	HNX	5 hr
Jan 31, 3:34 AM PST	Dense Fog Advisory	HNX	8 hr
Jan 31, 7:17 PM PST	Dense Fog Advisory	HNX	11 hr
Feb 3, 9:58 PM PST	Dense Fog Advisory	HNX	12 hr
Feb 5, 3:14 PM PST	Special Weather Statement	HNX	31 min
Feb 6, 5:13 AM PST	Dense Fog Advisory	HNX	6 hr
Feb 6, 9:34 PM PST	Dense Fog Advisory	HNX	11 hr
Feb 7, 12:53 PM PST	Dense Fog Advisory	HNX	20 hr
Feb 8, 10:11 AM PST	Dense Fog Advisory	HNX	23 hr
Feb 9, 10:54 AM PST	Dense Fog Advisory	HNX	22 hr
Feb 10, 9:39 AM PST	Wind Advisory	HNX	12 hr
Feb 12, 11:51 AM PST	Freeze Watch	HNX	24 hr
Feb 13, 1:10 AM PST	Wind Advisory	HNX	42 hr
Feb 13, 11:59 AM PST	Freeze Warning	HNX	69 hr
Feb 20, 1:01 AM PST	High Wind Warning	HNX	57 hr
Feb 20, 1:01 AM PST	Wind Advisory	HNX	50 hr
Feb 21, 1:37 AM PST	Winter Weather Advisory	HNX	5 days
Feb 22, 11:53 AM PST	Wind Advisory	HNX	55 hr
Feb 27, 1:05 AM PST	Wind Advisory	HNX	20 hr
Feb 28, 1:34 AM PST	Freeze Watch	HNX	34 hr
Feb 28, 11:08 AM PST	Freeze Warning	HNX	46 hr
Mar 1, 11:54 AM PST	Freeze Warning	HNX	45 hr
Mar 7, 12:26 PM PST	Flood Watch	HNX	8 days
Mar 8, 1:20 AM PST	Wind Advisory	HNX	69 hr
Mar 9, 2:05 PM PST	Areal Flood Advisory	HNX	11 hr
Mar 10, 1:51 AM PST	High Wind Warning	HNX	14 hr
Mar 10, 6:58 AM PST	Areal Flood Advisory	HNX	8 hr
Mar 10, 12:31 PM PST	River Flood Warning	HNX	12 days
Mar 10, 12:32 PM PST	River Flood Warning	HNX	16 hr
Mar 10, 2:20 PM PST	Areal Flood Advisory	HNX	18 hr
Mar 11, 12:50 PM PST	Mesoscale Discussion	SPC	115 min
Mar 12, 1:50 PM PDT	Mesoscale Discussion	SPC	2 hr
Mar 12, 2:53 PM PDT	Special Weather Statement	HNX	37 min
Mar 12, 3:05 PM PDT	Tornado Warning	HNX	25 min
Mar 12, 3:22 PM PDT	Severe Thunderstorm Warning	HNX	23 min
Mar 12, 3:44 PM PDT	Severe Thunderstorm Warning	HNX	31 min
Mar 12, 3:46 PM PDT	Special Weather Statement	HNX	29 min
Mar 12, 4:10 PM PDT	Special Weather Statement	HNX	35 min
Mar 12, 5:09 PM PDT	Areal Flood Advisory	HNX	4 hr
Mar 12, 5:22 PM PDT	Special Weather Statement	HNX	38 min
Mar 12, 6:34 PM PDT	Areal Flood Advisory	HNX	110 min
Mar 12, 6:35 PM PDT	Areal Flood Advisory	HNX	3 hr
Mar 12, 6:36 PM PDT	Special Weather Statement	HNX	24 min
Mar 12, 6:59 PM PDT	Special Weather Statement	HNX	31 min
Mar 12, 7:29 PM PDT	Special Weather Statement	HNX	31 min
Mar 13, 2:23 PM PDT	Special Weather Statement	HNX	22 min
Mar 14, 4:40 AM PDT	Areal Flood Advisory	HNX	12 hr
Mar 14, 8:41 AM PDT	High Wind Warning	HNX	10 hr
Mar 14, 8:41 AM PDT	Wind Advisory	HNX	18 hr
Mar 14, 4:39 PM PDT	Special Weather Statement	HNX	36 min
Mar 14, 5:12 PM PDT	Special Weather Statement	HNX	33 min
Mar 14, 5:31 PM PDT	Areal Flood Advisory	HNX	3 hr
Mar 20, 1:34 PM PDT	High Wind Warning	HNX	31 hr
Mar 20, 1:34 PM PDT	Wind Advisory	HNX	39 hr
Mar 20, 2:02 PM PDT	Flood Watch	HNX	57 hr
Mar 22, 6:20 PM PDT	Areal Flood Advisory	HNX	3 hr
Mar 23, 1:53 PM PDT	River Flood Warning	HNX	15 days
Mar 28, 1:37 AM PDT	Wind Advisory	HNX	51 hr
Mar 28, 9:56 AM PDT	Flood Watch	HNX	43 hr
Mar 29, 3:24 PM PDT	Special Weather Statement	HNX	36 min
Mar 29, 4:14 PM PDT	Special Weather Statement	HNX	31 min
Mar 29, 4:42 PM PDT	Special Weather Statement	HNX	33 min
Mar 29, 4:57 PM PDT	Severe Thunderstorm Warning	HNX	33 min
Mar 29, 5:41 PM PDT	Special Weather Statement	HNX	34 min
Mar 30, 5:07 AM PDT	Flood Watch	HNX	6 hr
Apr 2, 8:08 AM PDT	Wind Advisory	HNX	39 hr
Apr 7, 9:58 AM PDT	River Flood Warning	HNX	3 days
Apr 14, 8:55 AM PDT	River Flood Warning	HNX	3 days
Apr 18, 9:15 AM PDT	River Flood Warning	HNX	72 hr
May 4, 5:07 PM PDT	Special Weather Statement	HNX	23 min
May 10, 11:18 PM PDT	Heat Advisory	HNX	5 days
Jun 27, 9:20 AM PDT	Excessive Heat Watch	HNX	50 hr
Jun 28, 11:46 AM PDT	Excessive Heat Warning	HNX	4 days
Jul 10, 2:34 AM PDT	Excessive Heat Watch	HNX	45 hr
Jul 11, 11:23 PM PDT	Excessive Heat Warning	HNX	6 days
Jul 18, 11:53 AM PDT	Excessive Heat Watch	HNX	39 hr
Jul 19, 12:26 PM PDT	Excessive Heat Warning	HNX	4 days
Jul 19, 12:26 PM PDT	Heat Advisory	HNX	59 hr
Jul 19, 12:26 PM PDT	Heat Advisory	HNX	72 hr
Aug 13, 1:23 AM PDT	Heat Advisory	HNX	5 days
Aug 19, 1:19 PM PDT	Mesoscale Discussion	SPC	2 hr
Aug 21, 12:16 PM PDT	Special Weather Statement	HNX	29 min
Aug 21, 12:35 PM PDT	Severe Thunderstorm Warning	HNX	25 min
Aug 21, 12:41 PM PDT	Tornado Warning	HNX	34 min
Aug 21, 1:12 PM PDT	Areal Flood Advisory	HNX	2 hr
Aug 21, 1:12 PM PDT	Tornado Warning	HNX	33 min
Aug 21, 1:22 PM PDT	Special Weather Statement	HNX	23 min
Aug 21, 1:28 PM PDT	Severe Thunderstorm Warning	HNX	32 min
Aug 21, 1:45 PM PDT	Severe Thunderstorm Warning	HNX	30 min
Aug 21, 1:59 PM PDT	Severe Thunderstorm Warning	HNX	34 min
Aug 21, 2:23 PM PDT	Special Weather Statement	HNX	37 min
Aug 21, 2:33 PM PDT	Areal Flood Advisory	HNX	117 min
Nov 17, 6:06 AM PST	Dense Fog Advisory	HNX	4 hr
Nov 18, 2:00 PM PST	Special Weather Statement	HNX	45 min
Nov 18, 2:39 PM PST	Special Weather Statement	HNX	36 min
Nov 18, 2:50 PM PST	Special Weather Statement	HNX	40 min
Nov 18, 3:12 PM PST	Special Weather Statement	HNX	33 min
Nov 18, 3:20 PM PST	Special Weather Statement	HNX	25 min
Nov 18, 3:43 PM PST	Special Weather Statement	HNX	32 min
Nov 23, 11:07 AM PST	Freeze Watch	HNX	16 hr
Nov 24, 3:24 AM PST	Freeze Warning	HNX	5 days
Dec 4, 3:14 PM PST	Dense Fog Advisory	HNX	18 hr
Dec 7, 1:38 AM PST	Freeze Watch	HNX	26 hr
Dec 8, 3:17 AM PST	Freeze Warning	HNX	5 days
Dec 8, 11:19 PM PST	Dense Fog Advisory	HNX	11 hr
Dec 17, 2:19 PM PST	Special Weather Statement	HNX	26 min
Dec 19, 5:18 PM PST	Special Weather Statement	HNX	27 min
Dec 19, 5:45 PM PST	Special Weather Statement	HNX	30 min
Dec 21, 8:51 PM PST	Dense Fog Advisory	HNX	12 hr
Dec 22, 8:12 PM PST	Dense Fog Advisory	HNX	14 hr
Dec 24, 7:11 PM PST	Dense Fog Advisory	HNX	16 hr
Dec 28, 2:07 PM PST	Wind Advisory	HNX	35 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
Severe Thunderstorm Warning	7
Tornado Warning	3
Mesoscale Discussion	3
Special Weather Statement	28
Flooding
Areal Flood Warning	3
River Flood Warning	7
Flood Watch	7
River Flood Watch	1
Areal Flood Advisory	16
Winter
Winter Weather Advisory	1
Heat
Excessive Heat Warning	3
Excessive Heat Watch	3
Heat Advisory	4
Cold
Freeze Warning	8
Freeze Watch	6
Wind and dust
High Wind Warning	5
Wind Advisory	17
Fog and smoke
Dense Fog Advisory	21

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.