Alert archive / Arizona / Maricopa County

Weather alerts in Maricopa County, Arizona, 2023

231 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Maricopa County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts: 231
Warnings: 115
Watches: 18
Advisories: 61
Busiest month: September54 alerts
Busiest day: September 13, 202322 alerts

Over time

By month

Warning verification

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

Maricopa County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	49	19	61%	45	80%	25 min
Flash flood warnings	14	5	64%	10	90%	65 min

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Phoenix, AZ: severe thunderstorm warnings	87	23	74%	71	77%	21 min
NWS Phoenix, AZ: flash flood warnings	47	21	55%	50	88%	96 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, Mountain Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 1, 1:27 PM MST	Special Weather Statement	PSR	48 min
Jan 1, 1:41 PM MST	Severe Thunderstorm Warning	PSR	34 min
Jan 1, 1:47 PM MST	Mesoscale Discussion	SPC	2 hr
Jan 1, 1:57 PM MST	Special Weather Statement	PSR	48 min
Jan 1, 2:11 PM MST	Special Weather Statement	PSR	49 min
Jan 1, 2:40 PM MST	Special Weather Statement	PSR	50 min
Jan 1, 3:25 PM MST	Special Weather Statement	PSR	50 min
Jan 1, 4:16 PM MST	Special Weather Statement	PSR	44 min
Jan 1, 4:58 PM MST	Special Weather Statement	PSR	47 min
Jan 1, 5:35 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
Jan 1, 7:05 PM MST	Special Weather Statement	PSR	25 min
Jan 1, 9:37 PM MST	Areal Flood Warning	PSR	6 hr
Jan 15, 9:05 PM MST	Wind Advisory	PSR	41 hr
Jan 17, 6:46 AM MST	Areal Flood Warning	PSR	11 hr
Jan 20, 1:40 AM MST	Freeze Warning	PSR	31 hr
Jan 20, 1:40 AM MST	Freeze Warning	PSR	55 hr
Jan 22, 1:02 PM MST	Freeze Watch	PSR	12 hr
Jan 23, 1:10 AM MST	Freeze Warning	PSR	32 hr
Jan 24, 1:03 PM MST	Freeze Warning	PSR	20 hr
Feb 12, 2:36 AM MST	High Wind Watch	PSR	35 hr
Feb 13, 3:40 AM MST	Winter Weather Advisory	PSR	49 hr
Feb 13, 5:43 AM MST	Wind Advisory	PSR	43 hr
Feb 13, 1:44 PM MST	High Wind Warning	PSR	35 hr
Feb 14, 3:14 AM MST	Blowing Dust Advisory	PSR	18 hr
Feb 14, 6:26 PM MST	Special Weather Statement	PSR	49 min
Feb 14, 7:18 PM MST	Special Weather Statement	PSR	42 min
Feb 14, 7:57 PM MST	Special Weather Statement	PSR	48 min
Feb 14, 8:45 PM MST	Special Weather Statement	PSR	45 min
Feb 15, 12:56 AM MST	Freeze Warning	PSR	32 hr
Feb 15, 12:56 AM MST	Hard Freeze Warning	PSR	32 hr
Feb 16, 1:23 PM MST	Wind Advisory	PSR	26 hr
Feb 19, 1:10 PM MST	High Wind Watch	PSR	25 hr
Feb 20, 1:45 PM MST	High Wind Warning	PSR	54 hr
Feb 20, 1:45 PM MST	Wind Advisory	PSR	57 hr
Feb 21, 2:06 AM MST	Winter Storm Warning	PSR	35 hr
Feb 21, 2:06 AM MST	Winter Weather Advisory	PSR	45 hr
Feb 22, 7:10 AM MST	Severe Thunderstorm Warning	PSR	35 min
Feb 23, 5:54 AM MST	Winter Weather Advisory	PSR	7 hr
Feb 24, 2:21 PM MST	Wind Advisory	PSR	30 hr
Feb 25, 1:38 AM MST	Winter Weather Advisory	PSR	36 hr
Feb 27, 1:22 PM MST	Winter Storm Watch	PSR	13 hr
Feb 28, 2:10 AM MST	Winter Storm Warning	PSR	57 hr
Feb 28, 2:10 AM MST	Winter Weather Advisory	PSR	57 hr
Feb 28, 2:15 AM MST	Wind Advisory	PSR	56 hr
Mar 1, 6:31 PM MST	Special Weather Statement	PSR	44 min
Mar 1, 6:58 PM MST	Severe Thunderstorm Warning	PSR	32 min
Mar 1, 7:13 PM MST	Severe Thunderstorm Warning	PSR	32 min
Mar 1, 7:15 PM MST	Severe Thunderstorm Warning	PSR	30 min
Mar 1, 7:30 PM MST	Severe Thunderstorm Warning	PSR	29 min
Mar 2, 7:59 AM MST	Areal Flood Advisory	PSR	4 hr
Mar 2, 11:48 AM MST	Areal Flood Advisory	PSR	3 hr
Mar 4, 2:00 PM MST	Areal Flood Warning	PSR	48 days
Mar 11, 3:45 PM MST	Areal Flood Advisory	PSR	3 hr
Mar 12, 5:04 PM MST	Areal Flood Warning	PSR	40 days
Mar 14, 8:05 PM MST	Areal Flood Warning	PSR	38 days
Mar 15, 7:42 PM MST	Special Weather Statement	PSR	48 min
Mar 15, 7:47 PM MST	Areal Flood Advisory	PSR	3 hr
Mar 15, 8:14 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
Mar 18, 8:00 PM MST	Areal Flood Warning	PSR	34 days
Mar 18, 8:01 PM MST	Areal Flood Warning	PSR	5 days
Mar 19, 12:49 PM MST	Flood Watch	PSR	3 days
Mar 20, 2:15 AM MST	Wind Advisory	PSR	56 hr
Mar 21, 1:38 PM MST	Areal Flood Warning	PSR	8 hr
Mar 21, 7:24 PM MST	Areal Flood Warning	PSR	29 hr
Mar 21, 9:53 PM MST	Areal Flood Warning	PSR	34 hr
Mar 21, 11:26 PM MST	Areal Flood Warning	PSR	34 hr
Mar 22, 4:46 AM MST	Areal Flood Warning	PSR	19 hr
Mar 22, 8:23 AM MST	Areal Flood Warning	PSR	6 hr
Mar 22, 12:17 PM MST	Areal Flood Warning	PSR	25 hr
Mar 22, 3:53 PM MST	Areal Flood Warning	PSR	14 hr
Mar 23, 7:52 AM MST	Areal Flood Warning	PSR	12 hr
Mar 23, 9:48 AM MST	Areal Flood Warning	PSR	4 hr
Mar 23, 1:34 PM MST	Areal Flood Warning	PSR	7 hr
Mar 23, 8:07 PM MST	Areal Flood Warning	PSR	15 days
Mar 24, 3:26 PM MST	Areal Flood Warning	PSR	28 days
Mar 24, 3:41 PM MST	Areal Flood Warning	PSR	81 days
Apr 2, 1:44 AM MST	Wind Advisory	PSR	51 hr
Apr 18, 12:25 AM MST	Fire Weather Watch	PSR	13 hr
Apr 28, 11:40 PM MST	Areal Flood Warning	PSR	68 hr
Apr 29, 2:04 AM MST	Fire Weather Watch	PSR	35 hr
Apr 30, 12:52 PM MST	Red Flag Warning	PSR	31 hr
May 4, 8:15 AM MST	Areal Flood Warning	PSR	5 days
May 14, 4:32 PM MST	Dust Storm Advisory	PSR	43 min
May 16, 5:57 PM MST	Dust Storm Advisory	PSR	63 min
May 16, 7:35 PM MST	Areal Flood Advisory	PSR	3 hr
May 17, 9:52 PM MST	Special Weather Statement	PSR	53 min
May 18, 5:51 PM MST	Special Weather Statement	PSR	39 min
May 18, 6:32 PM MST	Special Weather Statement	PSR	43 min
May 19, 4:37 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
May 19, 5:03 PM MST	Special Weather Statement	PSR	42 min
May 19, 5:44 PM MST	Areal Flood Advisory	PSR	3 hr
Jun 25, 12:52 PM MST	Fire Weather Watch	PSR	24 hr
Jun 26, 1:01 PM MST	Fire Weather Watch	PSR	24 hr
Jun 26, 1:01 PM MST	Red Flag Warning	PSR	31 hr
Jun 27, 12:57 PM MST	Red Flag Warning	PSR	31 hr
Jun 28, 12:57 PM MST	Excessive Heat Watch	PSR	23 hr
Jun 29, 11:49 AM MST	Excessive Heat Warning	PSR	30 days
Jul 17, 1:57 AM MST	Blowing Dust Advisory	PSR	20 hr
Jul 17, 7:57 AM MST	Heat Advisory	PSR	6 days
Jul 17, 6:43 PM MST	Special Weather Statement	PSR	2 hr
Jul 21, 5:53 PM MST	Special Weather Statement	PSR	22 min
Jul 22, 2:32 AM MST	Blowing Dust Advisory	PSR	20 hr
Jul 23, 3:07 AM MST	Blowing Dust Advisory	PSR	15 hr
Jul 24, 1:32 PM MST	Excessive Heat Warning	PSR	4 days
Jul 24, 1:32 PM MST	Heat Advisory	PSR	4 days
Jul 24, 4:21 PM MST	Dust Storm Advisory	PSR	39 min
Jul 24, 4:51 PM MST	Special Weather Statement	PSR	54 min
Jul 24, 5:03 PM MST	Dust Storm Advisory	PSR	57 min
Jul 24, 5:46 PM MST	Special Weather Statement	PSR	44 min
Jul 24, 6:18 PM MST	Dust Storm Advisory	PSR	42 min
Jul 26, 10:57 AM MST	Blowing Dust Advisory	PSR	11 hr
Jul 26, 7:29 PM MST	Severe Thunderstorm Warning	PSR	22 min
Jul 26, 8:34 PM MST	Dust Storm Warning	PSR	41 min
Jul 26, 8:58 PM MST	Severe Thunderstorm Warning	PSR	47 min
Jul 26, 9:03 PM MST	Dust Storm Warning	PSR	42 min
Jul 26, 9:47 PM MST	Dust Storm Advisory	PSR	58 min
Jul 26, 9:49 PM MST	Severe Thunderstorm Warning	PSR	41 min
Jul 26, 9:53 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 26, 10:01 PM MST	Severe Thunderstorm Warning	PSR	44 min
Jul 26, 10:27 PM MST	Severe Thunderstorm Warning	PSR	33 min
Jul 26, 10:33 PM MST	Severe Thunderstorm Warning	PSR	42 min
Jul 26, 11:08 PM MST	Special Weather Statement	PSR	37 min
Jul 28, 8:27 PM MST	Dust Storm Advisory	PSR	63 min
Jul 28, 10:20 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
Jul 30, 4:40 PM MST	Severe Thunderstorm Warning	PSR	35 min
Jul 30, 5:11 PM MST	Severe Thunderstorm Warning	PSR	49 min
Jul 30, 5:15 PM MST	Mesoscale Discussion	SPC	90 min
Jul 30, 9:38 PM MST	Special Weather Statement	PSR	112 min
Jul 31, 7:50 PM MST	Dust Storm Advisory	PSR	85 min
Jul 31, 9:24 PM MST	Dust Storm Advisory	PSR	51 min
Aug 1, 1:13 AM MST	Excessive Heat Watch	PSR	23 hr
Aug 2, 12:40 AM MST	Excessive Heat Warning	PSR	6 days
Aug 11, 3:08 PM MST	Special Weather Statement	PSR	52 min
Aug 11, 3:22 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 13, 12:29 PM MST	Excessive Heat Watch	PSR	24 hr
Aug 13, 1:10 PM MST	Severe Thunderstorm Warning	PSR	50 min
Aug 13, 1:47 PM MST	Special Weather Statement	PSR	43 min
Aug 13, 2:55 PM MST	Special Weather Statement	PSR	50 min
Aug 14, 12:24 PM MST	Excessive Heat Warning	PSR	3 days
Aug 15, 4:36 PM MST	Dust Storm Advisory	PSR	54 min
Aug 15, 8:21 PM MST	Severe Thunderstorm Warning	PSR	39 min
Aug 15, 9:00 PM MST	Special Weather Statement	PSR	60 min
Aug 16, 3:38 PM MST	Special Weather Statement	PSR	52 min
Aug 16, 3:43 PM MST	Severe Thunderstorm Warning	PSR	25 min
Aug 16, 6:50 PM MST	Severe Thunderstorm Warning	PSR	40 min
Aug 16, 6:59 PM MST	Flash Flood Warning Considerable damage threat	PSR	3 hr
Aug 17, 1:17 PM MST	Flood Watch	PSR	4 days
Aug 17, 2:21 PM MST	Areal Flood Advisory	PSR	12 min
Aug 17, 2:24 PM MST	Severe Thunderstorm Warning	PSR	51 min
Aug 17, 2:33 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
Aug 17, 5:06 PM MST	Severe Thunderstorm Warning	PSR	39 min
Aug 17, 5:18 PM MST	Severe Thunderstorm Warning	PSR	12 min
Aug 17, 5:43 PM MST	Severe Thunderstorm Warning	PSR	32 min
Aug 17, 5:51 PM MST	Areal Flood Advisory	PSR	25 min
Aug 17, 6:11 PM MST	Severe Thunderstorm Warning	PSR	34 min
Aug 17, 6:16 PM MST	Flash Flood Warning	PSR	119 min
Aug 17, 7:03 PM MST	Dust Storm Advisory	PSR	42 min
Aug 18, 1:18 PM MST	Wind Advisory	PSR	60 hr
Aug 18, 3:38 PM MST	Mesoscale Discussion	SPC	3 hr
Aug 18, 5:36 PM MST	Dust Storm Warning	PSR	54 min
Aug 21, 4:03 PM MST	Severe Thunderstorm Warning	PSR	42 min
Aug 21, 4:37 PM MST	Severe Thunderstorm Warning	PSR	38 min
Aug 21, 5:10 PM MST	Severe Thunderstorm Warning	PSR	20 min
Aug 21, 5:35 PM MST	Severe Thunderstorm Warning	PSR	27 min
Aug 21, 5:58 PM MST	Severe Thunderstorm Warning	PSR	22 min
Aug 22, 5:54 PM MST	Dust Storm Advisory	PSR	51 min
Aug 23, 12:11 PM MST	Blowing Dust Advisory	PSR	5 hr
Aug 24, 12:20 PM MST	Excessive Heat Watch	PSR	23 hr
Aug 25, 11:43 AM MST	Excessive Heat Warning	PSR	5 days
Aug 31, 1:58 AM MST	Blowing Dust Advisory	PSR	21 hr
Aug 31, 1:15 PM MST	Flood Watch	PSR	35 hr
Aug 31, 7:05 PM MST	Dust Storm Warning	PSR	55 min
Aug 31, 7:15 PM MST	Severe Thunderstorm Warning	PSR	45 min
Aug 31, 7:42 PM MST	Mesoscale Discussion	SPC	3 hr
Aug 31, 8:02 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	73 min
Aug 31, 8:14 PM MST	Dust Storm Warning	PSR	31 min
Aug 31, 8:24 PM MST	Special Weather Statement	PSR	66 min
Aug 31, 8:33 PM MST	Dust Storm Warning	PSR	83 min
Aug 31, 8:36 PM MST	Severe Thunderstorm Warning	PSR	69 min
Aug 31, 8:47 PM MST	Severe Thunderstorm Warning Considerable damage threat	PSR	58 min
Aug 31, 9:11 PM MST	Severe Thunderstorm Warning	PSR	35 min
Aug 31, 9:18 PM MST	Areal Flood Advisory	PSR	117 min
Aug 31, 9:45 PM MST	Severe Thunderstorm Warning	PSR	60 min
Aug 31, 10:00 PM MST	Flash Flood Warning Considerable damage threat	PSR	3 hr
Aug 31, 10:12 PM MST	Dust Storm Warning	PSR	63 min
Aug 31, 11:05 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 1, 1:18 AM MST	Areal Flood Warning	PSR	3 hr
Sep 1, 2:54 AM MST	Areal Flood Warning	PSR	4 hr
Sep 1, 11:33 AM MST	Severe Thunderstorm Warning	PSR	42 min
Sep 1, 12:06 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 1, 1:59 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 2, 4:36 PM MST	Flash Flood Warning Considerable damage threat	PSR	5 hr
Sep 2, 4:46 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 2, 5:22 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
Sep 6, 1:01 AM MST	Excessive Heat Watch	PSR	24 hr
Sep 7, 1:19 AM MST	Excessive Heat Warning	PSR	4 days
Sep 12, 2:14 PM MST	Severe Thunderstorm Warning	PSR	46 min
Sep 12, 3:08 PM MST	Severe Thunderstorm Warning	PSR	52 min
Sep 12, 3:47 PM MST	Special Weather Statement	PSR	5 hr
Sep 12, 5:04 PM MST	Areal Flood Advisory	PSR	116 min
Sep 12, 5:15 PM MST	Severe Thunderstorm Warning	PSR	45 min
Sep 12, 5:49 PM MST	Flash Flood Warning Considerable damage threat	PSR	4 hr
Sep 12, 5:58 PM MST	Severe Thunderstorm Warning	PSR	32 min
Sep 12, 6:15 PM MST	Severe Thunderstorm Warning	PSR	30 min
Sep 12, 6:47 PM MST	Severe Thunderstorm Warning	PSR	43 min
Sep 12, 7:25 PM MST	Severe Thunderstorm Warning	PSR	50 min
Sep 12, 7:50 PM MST	Severe Thunderstorm Warning	PSR	40 min
Sep 12, 8:06 PM MST	Areal Flood Advisory	PSR	2 hr
Sep 12, 8:30 PM MST	Severe Thunderstorm Warning	PSR	45 min
Sep 12, 9:10 PM MST	Severe Thunderstorm Warning	PSR	35 min
Sep 12, 9:29 PM MST	Areal Flood Advisory	PSR	4 hr
Sep 12, 11:33 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 13, 12:54 AM MST	Areal Flood Advisory	PSR	113 min
Sep 13, 2:51 AM MST	Flash Flood Warning Considerable damage threat	PSR	6 hr
Sep 13, 5:34 AM MST	Areal Flood Advisory	PSR	35 min
Sep 13, 6:08 AM MST	Flash Flood Warning Considerable damage threat	PSR	3 hr
Sep 13, 6:41 AM MST	Severe Thunderstorm Warning	PSR	34 min
Sep 13, 7:02 AM MST	Mesoscale Discussion	SPC	118 min
Sep 13, 7:44 AM MST	Flash Flood Warning Considerable damage threat	PSR	3 hr
Sep 13, 7:56 AM MST	Areal Flood Advisory	PSR	3 hr
Sep 13, 12:51 PM MST	Severe Thunderstorm Warning	PSR	39 min
Sep 28, 1:26 AM MST	Fire Weather Watch	PSR	23 hr
Sep 28, 12:48 PM MST	Wind Advisory	PSR	64 hr
Sep 29, 12:52 AM MST	Red Flag Warning	PSR	42 hr
Sep 30, 11:48 AM MST	Blowing Dust Advisory	PSR	10 hr
Nov 17, 1:50 AM MST	Dense Fog Advisory	PSR	8 hr
Dec 21, 12:14 AM MST	Flood Watch	PSR	49 hr
Dec 22, 5:21 PM MST	Severe Thunderstorm Warning	PSR	39 min
Dec 22, 5:54 PM MST	Severe Thunderstorm Warning	PSR	51 min
Dec 22, 6:42 PM MST	Special Weather Statement	PSR	48 min
Dec 24, 4:17 AM MST	Dense Fog Advisory	PSR	7 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	49
Mesoscale Discussion	5
Special Weather Statement	32
Flooding
Areal Flood Warning	25
Flash Flood Warning	14
Flood Watch	4
Areal Flood Advisory	22
Winter
Winter Storm Warning	2
Winter Storm Watch	1
Winter Weather Advisory	5
Heat
Excessive Heat Warning	6
Excessive Heat Watch	5
Heat Advisory	2
Cold
Freeze Warning	5
Hard Freeze Warning	1
Freeze Watch	1
Wind and dust
Dust Storm Warning	7
High Wind Warning	2
High Wind Watch	2
Blowing Dust Advisory	8
Dust Storm Advisory	12
Wind Advisory	10
Fire
Red Flag Warning	4
Fire Weather Watch	5
Fog and smoke
Dense Fog Advisory	2

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.