Alert archive / Arizona / Maricopa County

Weather alerts in Maricopa County, Arizona, 2015

242 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts: 242
Warnings: 67
Watches: 2
Advisories: 76
Busiest month: August58 alerts
Busiest day: October 20, 201520 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 1 tornado reports fell inside a warning.

Maricopa County, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			1	0%
Severe thunderstorm warnings	51	23	55%	119	56%	15 min
Flash flood warnings	12	1	92%	5	20%	53 min

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Phoenix, AZ: tornado warnings	0			3	0%
NWS Phoenix, AZ: severe thunderstorm warnings	85	30	65%	153	52%	15 min
NWS Phoenix, AZ: flash flood warnings	25	4	84%	14	36%	79 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 30, 12:30 PM MST	Areal Flood Advisory	PSR	3 hr
Jan 30, 3:30 PM MST	Areal Flood Advisory	PSR	2 hr
Jan 31, 6:52 AM MST	Areal Flood Advisory	PSR	3 hr
Apr 13, 4:16 AM MST	Fire Weather Watch	PSR	23 hr
Apr 14, 3:41 AM MST	Red Flag Warning	PSR	41 hr
May 4, 1:36 PM MST	Areal Flood Advisory	PSR	3 hr
May 4, 1:51 PM MST	Special Weather Statement	PSR	54 min
May 4, 2:07 PM MST	Special Weather Statement	PSR	38 min
May 4, 2:25 PM MST	Special Weather Statement	PSR	50 min
May 4, 3:19 PM MST	Special Weather Statement	PSR	41 min
May 4, 4:14 PM MST	Special Weather Statement	PSR	46 min
May 4, 5:26 PM MST	Areal Flood Advisory	PSR	3 hr
May 15, 3:47 PM MST	Areal Flood Advisory	PSR	3 hr
May 15, 4:26 PM MST	Areal Flood Advisory	PSR	3 hr
May 15, 8:46 PM MST	Special Weather Statement	PSR	44 min
May 15, 9:22 PM MST	Areal Flood Advisory	PSR	3 hr
May 15, 10:45 PM MST	Areal Flood Advisory	PSR	3 hr
May 16, 12:02 AM MST	Areal Flood Advisory	PSR	3 hr
Jun 5, 4:38 AM MST	Special Weather Statement	PSR	52 min
Jun 5, 5:31 AM MST	Special Weather Statement	PSR	59 min
Jun 5, 3:46 PM MST	Severe Thunderstorm Warning	PSR	29 min
Jun 27, 4:53 PM MST	Mesoscale Discussion	SPC	2 hr
Jun 27, 5:35 PM MST	Severe Thunderstorm Warning	PSR	40 min
Jun 28, 12:17 PM MST	Mesoscale Discussion	SPC	58 min
Jun 28, 5:38 PM MST	Severe Thunderstorm Warning	PSR	52 min
Jun 29, 3:32 PM MST	Mesoscale Discussion	SPC	88 min
Jun 29, 6:52 PM MST	Special Weather Statement	PSR	68 min
Jun 29, 7:11 PM MST	Severe Thunderstorm Warning	PSR	49 min
Jun 29, 7:32 PM MST	Special Weather Statement	PSR	58 min
Jun 29, 7:48 PM MST	Areal Flood Advisory	PSR	3 hr
Jun 29, 7:58 PM MST	Severe Thunderstorm Warning	PSR	32 min
Jun 29, 8:23 PM MST	Flash Flood Warning	PSR	112 min
Jun 29, 10:20 PM MST	Severe Thunderstorm Warning	PSR	25 min
Jun 29, 10:49 PM MST	Special Weather Statement	PSR	41 min
Jun 30, 1:25 PM MST	Mesoscale Discussion	SPC	95 min
Jun 30, 5:17 PM MST	Severe Thunderstorm Watch	SPC	7 hr
Jun 30, 7:36 PM MST	Special Weather Statement	PSR	39 min
Jun 30, 8:07 PM MST	Mesoscale Discussion	SPC	83 min
Jun 30, 10:17 PM MST	Special Weather Statement	PSR	88 min
Jun 30, 10:30 PM MST	Severe Thunderstorm Warning	PSR	45 min
Jul 1, 1:05 PM MST	Mesoscale Discussion	SPC	2 hr
Jul 3, 9:30 PM MST	Areal Flood Advisory	PSR	2 hr
Jul 5, 4:05 PM MST	Areal Flood Advisory	PSR	115 min
Jul 5, 4:49 PM MST	Flash Flood Warning	PSR	116 min
Jul 6, 3:48 AM MST	Areal Flood Advisory	PSR	3 hr
Jul 6, 6:04 PM MST	Special Weather Statement	PSR	41 min
Jul 6, 6:23 PM MST	Special Weather Statement	PSR	37 min
Jul 6, 6:54 PM MST	Areal Flood Advisory	PSR	2 hr
Jul 6, 7:33 PM MST	Special Weather Statement	PSR	42 min
Jul 14, 5:59 PM MST	Special Weather Statement	PSR	31 min
Jul 14, 6:33 PM MST	Severe Thunderstorm Warning	PSR	27 min
Jul 15, 7:06 PM MST	Areal Flood Advisory	PSR	114 min
Jul 15, 7:29 PM MST	Special Weather Statement	PSR	31 min
Jul 15, 8:01 PM MST	Special Weather Statement	PSR	29 min
Jul 17, 6:21 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 17, 7:40 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 17, 8:11 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 18, 3:17 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 18, 3:21 PM MST	Special Weather Statement	PSR	39 min
Jul 18, 3:46 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 18, 3:53 PM MST	Mesoscale Discussion	SPC	67 min
Jul 18, 4:16 PM MST	Special Weather Statement	PSR	59 min
Jul 18, 4:45 PM MST	Severe Thunderstorm Warning	PSR	30 min
Jul 18, 5:01 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 18, 5:40 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 18, 5:56 PM MST	Flash Flood Warning	PSR	6 hr
Jul 18, 8:02 PM MST	Areal Flood Advisory	PSR	118 min
Jul 18, 11:24 PM MST	Areal Flood Warning	PSR	6 hr
Jul 29, 6:53 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 29, 7:05 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 30, 2:03 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 31, 1:45 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 31, 2:07 PM MST	Severe Thunderstorm Warning	PSR	23 min
Jul 31, 2:52 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 31, 3:24 PM MST	Special Weather Statement	PSR	51 min
Jul 31, 3:43 PM MST	Special Weather Statement	PSR	47 min
Jul 31, 3:48 PM MST	Severe Thunderstorm Warning	PSR	27 min
Jul 31, 4:03 PM MST	Special Weather Statement	PSR	42 min
Jul 31, 4:05 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 31, 4:32 PM MST	Areal Flood Advisory	PSR	3 hr
Jul 31, 5:33 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 7, 4:47 PM MST	Special Weather Statement	PSR	43 min
Aug 7, 5:05 PM MST	Severe Thunderstorm Warning	PSR	25 min
Aug 7, 5:31 PM MST	Special Weather Statement	PSR	29 min
Aug 7, 6:06 PM MST	Special Weather Statement	PSR	39 min
Aug 8, 6:23 PM MST	Special Weather Statement	PSR	52 min
Aug 8, 6:29 PM MST	Special Weather Statement	PSR	46 min
Aug 11, 9:09 AM MST	Severe Thunderstorm Warning	PSR	36 min
Aug 11, 10:28 AM MST	Mesoscale Discussion	SPC	92 min
Aug 11, 10:39 AM MST	Special Weather Statement	PSR	51 min
Aug 11, 10:46 AM MST	Areal Flood Advisory	PSR	119 min
Aug 11, 11:29 AM MST	Areal Flood Advisory	PSR	3 hr
Aug 11, 3:33 PM MST	Areal Flood Advisory	PSR	117 min
Aug 11, 3:54 PM MST	Severe Thunderstorm Warning	PSR	36 min
Aug 11, 6:20 PM MST	Severe Thunderstorm Warning	PSR	40 min
Aug 11, 9:01 PM MST	Severe Thunderstorm Warning	PSR	44 min
Aug 11, 9:11 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 11, 9:41 PM MST	Severe Thunderstorm Warning	PSR	49 min
Aug 14, 4:50 PM MST	Special Weather Statement	PSR	40 min
Aug 14, 5:26 PM MST	Special Weather Statement	PSR	49 min
Aug 14, 5:31 PM MST	Special Weather Statement	PSR	29 min
Aug 14, 6:12 PM MST	Special Weather Statement	PSR	33 min
Aug 25, 5:17 PM MST	Severe Thunderstorm Warning	PSR	28 min
Aug 27, 2:27 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 27, 2:40 PM MST	Severe Thunderstorm Warning	PSR	50 min
Aug 27, 2:46 PM MST	Flash Flood Warning	PSR	119 min
Aug 27, 2:53 PM MST	Special Weather Statement	PSR	37 min
Aug 27, 3:05 PM MST	Special Weather Statement	PSR	40 min
Aug 27, 3:13 PM MST	Severe Thunderstorm Warning	PSR	47 min
Aug 27, 3:32 PM MST	Special Weather Statement	PSR	28 min
Aug 27, 3:49 PM MST	Special Weather Statement	PSR	41 min
Aug 27, 3:51 PM MST	Special Weather Statement	PSR	24 min
Aug 27, 3:56 PM MST	Special Weather Statement	PSR	34 min
Aug 27, 4:03 PM MST	Special Weather Statement	PSR	27 min
Aug 27, 4:15 PM MST	Special Weather Statement	PSR	30 min
Aug 27, 4:23 PM MST	Severe Thunderstorm Warning	PSR	37 min
Aug 27, 4:25 PM MST	Severe Thunderstorm Warning	PSR	35 min
Aug 27, 4:35 PM MST	Special Weather Statement	PSR	25 min
Aug 27, 4:56 PM MST	Severe Thunderstorm Warning	PSR	34 min
Aug 27, 5:10 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 29, 3:00 PM MST	Special Weather Statement	PSR	45 min
Aug 29, 6:13 PM MST	Special Weather Statement	PSR	32 min
Aug 29, 7:00 PM MST	Special Weather Statement	PSR	45 min
Aug 29, 7:17 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 29, 7:27 PM MST	Severe Thunderstorm Warning	PSR	33 min
Aug 29, 7:41 PM MST	Severe Thunderstorm Warning	PSR	34 min
Aug 29, 8:20 PM MST	Severe Thunderstorm Warning	PSR	40 min
Aug 29, 8:23 PM MST	Areal Flood Advisory	PSR	112 min
Aug 29, 8:36 PM MST	Severe Thunderstorm Warning	PSR	39 min
Aug 30, 5:30 PM MST	Special Weather Statement	PSR	30 min
Aug 30, 6:12 PM MST	Special Weather Statement	PSR	33 min
Aug 30, 6:23 PM MST	Severe Thunderstorm Warning	PSR	37 min
Aug 30, 6:34 PM MST	Special Weather Statement	PSR	41 min
Aug 30, 6:35 PM MST	Special Weather Statement	PSR	40 min
Aug 30, 7:29 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 30, 7:39 PM MST	Special Weather Statement	PSR	36 min
Aug 30, 8:18 PM MST	Special Weather Statement	PSR	42 min
Aug 30, 10:00 PM MST	Special Weather Statement	PSR	30 min
Aug 31, 6:57 PM MST	Special Weather Statement	PSR	33 min
Aug 31, 7:10 PM MST	Severe Thunderstorm Warning	PSR	35 min
Aug 31, 7:29 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 31, 7:31 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 31, 7:37 PM MST	Special Weather Statement	PSR	23 min
Aug 31, 7:44 PM MST	Flash Flood Warning	PSR	3 hr
Aug 31, 7:46 PM MST	Severe Thunderstorm Warning	PSR	29 min
Aug 31, 7:49 PM MST	Severe Thunderstorm Warning	PSR	26 min
Aug 31, 7:55 PM MST	Areal Flood Advisory	PSR	3 hr
Aug 31, 8:08 PM MST	Flash Flood Warning	PSR	3 hr
Aug 31, 8:17 PM MST	Severe Thunderstorm Warning	PSR	28 min
Aug 31, 8:31 PM MST	Areal Flood Advisory	PSR	119 min
Aug 31, 8:34 PM MST	Special Weather Statement	PSR	41 min
Aug 31, 8:40 PM MST	Severe Thunderstorm Warning	PSR	35 min
Aug 31, 8:53 PM MST	Flash Flood Warning	PSR	3 hr
Aug 31, 10:42 PM MST	Areal Flood Warning	PSR	3 hr
Sep 3, 2:01 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 3, 5:12 PM MST	Special Weather Statement	PSR	78 min
Sep 3, 5:32 PM MST	Severe Thunderstorm Warning	PSR	28 min
Sep 3, 5:45 PM MST	Special Weather Statement	PSR	60 min
Sep 4, 2:40 PM MST	Special Weather Statement	PSR	80 min
Sep 4, 4:13 PM MST	Special Weather Statement	PSR	77 min
Sep 5, 5:59 PM MST	Special Weather Statement	PSR	46 min
Sep 7, 7:14 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 7, 10:12 PM MST	Areal Flood Advisory	PSR	5 hr
Sep 8, 11:39 PM MST	Areal Flood Advisory	PSR	111 min
Sep 12, 5:03 PM MST	Severe Thunderstorm Warning	PSR	42 min
Sep 12, 5:52 PM MST	Severe Thunderstorm Warning	PSR	38 min
Sep 13, 7:24 PM MST	Areal Flood Advisory	PSR	111 min
Sep 13, 7:33 PM MST	Special Weather Statement	PSR	42 min
Sep 13, 7:44 PM MST	Special Weather Statement	PSR	46 min
Sep 13, 8:26 PM MST	Areal Flood Advisory	PSR	109 min
Sep 13, 9:56 PM MST	Areal Flood Advisory	PSR	109 min
Sep 13, 10:07 PM MST	Special Weather Statement	PSR	38 min
Sep 13, 10:35 PM MST	Areal Flood Advisory	PSR	115 min
Sep 13, 11:35 PM MST	Areal Flood Warning	PSR	3 hr
Sep 13, 11:58 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 14, 7:09 PM MST	Special Weather Statement	PSR	51 min
Sep 14, 7:15 PM MST	Severe Thunderstorm Warning	PSR	45 min
Sep 14, 7:36 PM MST	Severe Thunderstorm Warning	PSR	39 min
Sep 21, 1:13 PM MST	Special Weather Statement	PSR	47 min
Sep 21, 2:34 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 22, 2:47 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 22, 3:11 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 22, 3:35 PM MST	Special Weather Statement	PSR	25 min
Sep 22, 4:06 PM MST	Special Weather Statement	PSR	24 min
Sep 22, 5:51 PM MST	Special Weather Statement	PSR	24 min
Sep 22, 6:01 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 22, 6:09 PM MST	Areal Flood Advisory	PSR	3 hr
Sep 22, 6:18 PM MST	Severe Thunderstorm Warning	PSR	27 min
Sep 22, 6:36 PM MST	Areal Flood Advisory	PSR	5 hr
Sep 22, 7:23 PM MST	Flash Flood Warning	PSR	112 min
Oct 6, 12:05 PM MST	Special Weather Statement	PSR	40 min
Oct 6, 12:08 PM MST	Special Weather Statement	PSR	52 min
Oct 6, 12:15 PM MST	Special Weather Statement	PSR	45 min
Oct 6, 12:30 PM MST	Areal Flood Advisory	PSR	3 hr
Oct 6, 12:41 PM MST	Special Weather Statement	PSR	49 min
Oct 6, 12:58 PM MST	Areal Flood Advisory	PSR	3 hr
Oct 6, 1:28 PM MST	Flash Flood Warning	PSR	3 hr
Oct 6, 1:44 PM MST	Areal Flood Advisory	PSR	3 hr
Oct 6, 2:05 PM MST	Areal Flood Advisory	PSR	3 hr
Oct 6, 2:31 PM MST	Flash Flood Warning	PSR	119 min
Oct 6, 3:35 PM MST	Areal Flood Advisory	PSR	55 min
Oct 6, 5:13 PM MST	Areal Flood Advisory	PSR	2 hr
Oct 16, 1:29 PM MST	Special Weather Statement	PSR	46 min
Oct 16, 1:45 PM MST	Severe Thunderstorm Warning	PSR	30 min
Oct 18, 12:52 PM MST	Mesoscale Discussion	SPC	2 hr
Oct 18, 3:14 PM MST	Special Weather Statement	PSR	31 min
Oct 18, 3:40 PM MST	Special Weather Statement	PSR	35 min
Oct 18, 3:51 PM MST	Severe Thunderstorm Warning	PSR	24 min
Oct 18, 3:58 PM MST	Areal Flood Advisory	PSR	3 hr
Oct 18, 4:11 PM MST	Severe Thunderstorm Warning	PSR	34 min
Oct 18, 4:18 PM MST	Severe Thunderstorm Warning	PSR	16 min
Oct 18, 6:06 PM MST	Special Weather Statement	PSR	24 min
Oct 18, 6:19 PM MST	Special Weather Statement	PSR	41 min
Oct 18, 6:23 PM MST	Severe Thunderstorm Warning	PSR	24 min
Oct 18, 6:47 PM MST	Areal Flood Advisory	PSR	3 hr
Oct 19, 5:05 PM MST	Special Weather Statement	PSR	40 min
Oct 19, 5:24 PM MST	Severe Thunderstorm Warning	PSR	51 min
Oct 19, 8:49 PM MST	Mesoscale Discussion	SPC	116 min
Oct 19, 9:05 PM MST	Special Weather Statement	PSR	40 min
Oct 20, 12:58 AM MST	Special Weather Statement	PSR	47 min
Oct 20, 3:02 AM MST	Special Weather Statement	PSR	43 min
Oct 20, 4:08 AM MST	Severe Thunderstorm Warning	PSR	22 min
Oct 20, 4:21 AM MST	Severe Thunderstorm Warning	PSR	39 min
Oct 20, 5:38 AM MST	Areal Flood Advisory	PSR	3 hr
Oct 20, 7:50 AM MST	Areal Flood Advisory	PSR	3 hr
Oct 20, 8:30 AM MST	Areal Flood Advisory	PSR	60 min
Oct 20, 9:08 AM MST	Areal Flood Advisory	PSR	3 hr
Oct 20, 9:42 AM MST	Mesoscale Discussion	SPC	93 min
Oct 20, 10:01 AM MST	Areal Flood Advisory	PSR	3 hr
Oct 20, 10:09 AM MST	Flash Flood Warning	PSR	96 min
Oct 20, 10:47 AM MST	Severe Thunderstorm Warning	PSR	43 min
Oct 20, 11:23 AM MST	Flash Flood Warning	PSR	2 hr
Oct 20, 11:37 AM MST	Areal Flood Advisory	PSR	3 hr
Oct 20, 11:44 AM MST	Severe Thunderstorm Warning	PSR	46 min
Oct 20, 12:57 PM MST	Severe Thunderstorm Warning	PSR	33 min
Oct 21, 10:50 AM MST	Areal Flood Advisory	PSR	115 min
Oct 21, 3:48 PM MST	Areal Flood Advisory	PSR	117 min
Oct 21, 6:12 PM MST	Special Weather Statement	PSR	33 min
Oct 29, 1:14 PM MST	Special Weather Statement	PSR	61 min
Oct 29, 1:42 PM MST	Severe Thunderstorm Warning	PSR	33 min
Oct 29, 2:46 PM MST	Special Weather Statement	PSR	44 min
Oct 29, 3:30 PM MST	Special Weather Statement	PSR	45 min

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	51
Severe Thunderstorm Watch	1
Mesoscale Discussion	11
Special Weather Statement	86
Flooding
Areal Flood Warning	3
Flash Flood Warning	12
Areal Flood Advisory	76
Fire
Red Flag Warning	1
Fire Weather Watch	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 2014 2016

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.