Alert archive / Arizona / Maricopa County

Weather alerts in Maricopa County, Arizona, 2010

219 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts: 219
Warnings: 92
Watches: 9
Advisories: 63
Busiest month: July52 alerts
Busiest day: October 5, 201024 alerts

Over time

By month

Warning verification

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

1 of 3 tornado warnings covering Maricopa County in 2010 had a tornado report inside them; 1 of 2 tornado reports fell inside a warning, on average 0 minutes after it went out.

Maricopa County, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	3	1	67%	2	50%	0 min
Severe thunderstorm warnings	54	26	52%	81	70%	19 min
Flash flood warnings	24	8	67%	7	100%	29 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Phoenix, AZ: tornado warnings	4	2	50%	3	67%	9 min
NWS Phoenix, AZ: severe thunderstorm warnings	82	36	56%	113	69%	19 min
NWS Phoenix, AZ: flash flood warnings	38	11	71%	18	89%	36 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 19, 5:35 PM MST	Mesoscale Discussion	SPC	115 min
Jan 21, 8:04 AM MST	Flash Flood Warning	PSR	116 min
Jan 21, 10:03 AM MST	Flash Flood Warning	PSR	3 hr
Jan 21, 12:10 PM MST	Areal Flood Advisory	PSR	4 hr
Jan 21, 12:55 PM MST	Flash Flood Warning	PSR	11 hr
Jan 21, 1:50 PM MST	Flash Flood Warning	PSR	6 hr
Jan 21, 2:25 PM MST	River Flood Warning	PSR	25 hr
Jan 21, 4:12 PM MST	Tornado Watch	SPC	9 hr
Jan 21, 6:27 PM MST	Mesoscale Discussion	SPC	93 min
Jan 21, 7:38 PM MST	Flash Flood Warning	PSR	112 min
Jan 21, 8:32 PM MST	Tornado Warning	PSR	28 min
Jan 21, 8:45 PM MST	Tornado Warning	PSR	15 min
Jan 21, 9:03 PM MST	Tornado Warning	PSR	13 min
Jan 21, 9:30 PM MST	Flash Flood Warning	PSR	5 hr
Jan 21, 11:51 PM MST	Areal Flood Warning	PSR	8 hr
Jan 22, 1:16 AM MST	Areal Flood Advisory	PSR	6 hr
Jan 22, 2:37 AM MST	River Flood Advisory	PSR	36 hr
Jan 22, 3:04 AM MST	Flash Flood Warning	PSR	6 hr
Jan 22, 6:50 AM MST	Flash Flood Warning	PSR	3 hr
Jan 22, 7:57 AM MST	Areal Flood Warning	PSR	8 hr
Jan 22, 9:10 AM MST	Flash Flood Warning	PSR	3 hr
Jan 22, 10:15 AM MST	Areal Flood Warning	PSR	12 hr
Jan 22, 12:56 PM MST	Flash Flood Warning	PSR	6 hr
Jan 22, 4:12 PM MST	Special Weather Statement	PSR	48 min
Jan 22, 7:22 PM MST	Areal Flood Advisory	PSR	8 hr
Jan 22, 9:05 PM MST	Areal Flood Advisory	PSR	6 hr
Jan 23, 3:00 AM MST	Areal Flood Advisory	PSR	6 hr
Feb 21, 5:25 AM MST	Areal Flood Advisory	PSR	3 hr
Feb 27, 11:19 PM MST	Special Weather Statement	PSR	56 min
Feb 28, 12:09 AM MST	Special Weather Statement	PSR	66 min
Feb 28, 5:01 PM MST	Special Weather Statement	PSR	29 min
Feb 28, 5:38 PM MST	Special Weather Statement	PSR	22 min
Feb 28, 6:04 PM MST	Special Weather Statement	PSR	41 min
Mar 7, 11:58 AM MST	Areal Flood Advisory	PSR	107 min
Mar 7, 7:22 PM MST	Special Weather Statement	PSR	23 min
Mar 7, 7:35 PM MST	Special Weather Statement	PSR	40 min
Mar 9, 12:29 PM MST	Severe Thunderstorm Warning	PSR	46 min
Mar 9, 1:00 PM MST	Severe Thunderstorm Warning	PSR	38 min
Mar 9, 1:16 PM MST	Areal Flood Advisory	PSR	104 min
Mar 23, 8:00 AM MST	Areal Flood Advisory	PSR	2 hr
Apr 10, 2:01 PM MST	Fire Weather Watch	PSR	38 hr
Apr 12, 4:13 AM MST	Red Flag Warning	PSR	15 hr
Apr 27, 4:31 AM MST	Fire Weather Watch	PSR	11 hr
Apr 27, 3:13 PM MST	Red Flag Warning	PSR	29 hr
Apr 29, 1:52 PM MST	Red Flag Warning	PSR	6 hr
Apr 30, 1:15 PM MST	Fire Weather Watch	PSR	24 hr
May 1, 1:33 PM MST	Red Flag Warning	PSR	29 hr
May 7, 2:25 PM MST	Fire Weather Watch	PSR	24 hr
May 8, 2:42 PM MST	Red Flag Warning	PSR	32 hr
May 21, 2:06 PM MST	Fire Weather Watch	PSR	15 hr
May 21, 2:06 PM MST	Fire Weather Watch	PSR	15 hr
May 22, 5:19 AM MST	Red Flag Warning	PSR	14 hr
May 22, 5:19 AM MST	Red Flag Warning	PSR	39 hr
Jun 12, 9:14 AM MST	Special Weather Statement	PSR	46 min
Jun 12, 2:44 PM MST	Special Weather Statement	PSR	76 min
Jun 12, 3:16 PM MST	Special Weather Statement	PSR	44 min
Jun 12, 3:52 PM MST	Special Weather Statement	PSR	38 min
Jun 12, 4:16 PM MST	Special Weather Statement	PSR	29 min
Jul 15, 5:46 PM MST	Severe Thunderstorm Warning	PSR	46 min
Jul 15, 6:24 PM MST	Flash Flood Warning	PSR	88 min
Jul 16, 3:56 PM MST	Mesoscale Discussion	SPC	94 min
Jul 16, 5:11 PM MST	Special Weather Statement	PSR	79 min
Jul 16, 6:28 PM MST	Special Weather Statement	PSR	77 min
Jul 16, 8:03 PM MST	Areal Flood Advisory	PSR	117 min
Jul 17, 4:08 PM MST	Mesoscale Discussion	SPC	97 min
Jul 18, 1:49 AM MST	Special Weather Statement	PSR	56 min
Jul 20, 11:47 PM MST	Flash Flood Warning	PSR	6 hr
Jul 21, 6:56 PM MST	Areal Flood Advisory	PSR	88 min
Jul 22, 6:00 PM MST	Areal Flood Advisory	PSR	79 min
Jul 23, 10:55 AM MST	Areal Flood Advisory	PSR	110 min
Jul 23, 12:52 PM MST	Areal Flood Advisory	PSR	113 min
Jul 23, 2:44 PM MST	Severe Thunderstorm Warning	PSR	61 min
Jul 23, 5:00 PM MST	Special Weather Statement	PSR	45 min
Jul 24, 3:56 PM MST	Areal Flood Advisory	PSR	109 min
Jul 24, 4:27 PM MST	Areal Flood Advisory	PSR	108 min
Jul 24, 5:01 PM MST	Areal Flood Advisory	PSR	119 min
Jul 27, 7:23 PM MST	Areal Flood Advisory	PSR	112 min
Jul 28, 4:11 PM MST	Severe Thunderstorm Warning	PSR	37 min
Jul 28, 4:22 PM MST	Areal Flood Advisory	PSR	113 min
Jul 28, 4:37 PM MST	Areal Flood Advisory	PSR	113 min
Jul 28, 5:23 PM MST	Areal Flood Advisory	PSR	112 min
Jul 28, 6:24 PM MST	Areal Flood Advisory	PSR	111 min
Jul 28, 6:30 PM MST	Severe Thunderstorm Warning	PSR	45 min
Jul 28, 7:53 PM MST	Areal Flood Advisory	PSR	112 min
Jul 28, 7:57 PM MST	Special Weather Statement	PSR	33 min
Jul 28, 8:30 PM MST	Special Weather Statement	PSR	45 min
Jul 29, 12:53 PM MST	Areal Flood Advisory	PSR	112 min
Jul 29, 1:08 PM MST	Areal Flood Advisory	PSR	112 min
Jul 29, 2:07 PM MST	Flash Flood Warning	PSR	113 min
Jul 29, 2:56 PM MST	Severe Thunderstorm Warning	PSR	34 min
Jul 29, 3:03 PM MST	Mesoscale Discussion	SPC	57 min
Jul 29, 3:18 PM MST	Areal Flood Advisory	PSR	117 min
Jul 29, 3:38 PM MST	Flash Flood Warning	PSR	70 min
Jul 29, 3:40 PM MST	Special Weather Statement	PSR	50 min
Jul 29, 3:46 PM MST	Severe Thunderstorm Warning	PSR	59 min
Jul 29, 3:52 PM MST	Areal Flood Advisory	PSR	113 min
Jul 29, 4:09 PM MST	Areal Flood Advisory	PSR	111 min
Jul 29, 4:24 PM MST	Severe Thunderstorm Warning	PSR	51 min
Jul 29, 4:44 PM MST	Flash Flood Warning	PSR	2 hr
Jul 29, 4:47 PM MST	Severe Thunderstorm Warning	PSR	45 min
Jul 29, 4:56 PM MST	Flash Flood Warning	PSR	2 hr
Jul 29, 4:56 PM MST	Severe Thunderstorm Warning	PSR	64 min
Jul 29, 5:15 PM MST	Severe Thunderstorm Warning	PSR	19 min
Jul 29, 5:37 PM MST	Flash Flood Warning	PSR	113 min
Jul 30, 6:31 PM MST	Special Weather Statement	PSR	44 min
Jul 30, 7:20 PM MST	Flash Flood Warning	PSR	115 min
Jul 31, 12:41 AM MST	Areal Flood Advisory	PSR	109 min
Jul 31, 3:09 AM MST	Areal Flood Advisory	PSR	111 min
Jul 31, 12:09 PM MST	Areal Flood Advisory	PSR	111 min
Jul 31, 1:46 PM MST	Areal Flood Advisory	PSR	104 min
Aug 6, 4:46 PM MST	Special Weather Statement	PSR	44 min
Aug 6, 6:22 PM MST	Special Weather Statement	PSR	38 min
Aug 17, 2:31 PM MST	Severe Thunderstorm Warning	PSR	38 min
Aug 17, 3:09 PM MST	Mesoscale Discussion	SPC	96 min
Aug 17, 4:18 PM MST	Areal Flood Advisory	PSR	117 min
Aug 17, 4:23 PM MST	Special Weather Statement	PSR	37 min
Aug 17, 4:36 PM MST	Areal Flood Advisory	PSR	114 min
Aug 17, 5:09 PM MST	Severe Thunderstorm Warning	PSR	51 min
Aug 17, 5:23 PM MST	Severe Thunderstorm Warning	PSR	37 min
Aug 17, 5:29 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 17, 5:35 PM MST	Areal Flood Advisory	PSR	115 min
Aug 17, 5:40 PM MST	Areal Flood Advisory	PSR	110 min
Aug 17, 5:48 PM MST	Severe Thunderstorm Warning	PSR	27 min
Aug 17, 5:50 PM MST	Areal Flood Advisory	PSR	115 min
Aug 17, 6:00 PM MST	Severe Thunderstorm Warning	PSR	45 min
Aug 17, 6:10 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 17, 6:21 PM MST	Flash Flood Warning	PSR	114 min
Aug 17, 6:54 PM MST	Special Weather Statement	PSR	51 min
Aug 17, 7:06 PM MST	Areal Flood Advisory	PSR	114 min
Aug 17, 9:01 PM MST	Special Weather Statement	PSR	44 min
Aug 21, 5:07 PM MST	Severe Thunderstorm Warning	PSR	23 min
Aug 21, 10:29 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 23, 6:23 PM MST	Special Weather Statement	PSR	37 min
Aug 24, 12:22 PM MST	Mesoscale Discussion	SPC	83 min
Aug 24, 3:35 PM MST	Severe Thunderstorm Warning	PSR	55 min
Aug 24, 4:12 PM MST	Severe Thunderstorm Warning	PSR	48 min
Aug 24, 4:45 PM MST	Severe Thunderstorm Warning	PSR	60 min
Aug 24, 4:52 PM MST	Areal Flood Advisory	PSR	113 min
Aug 24, 5:09 PM MST	Areal Flood Advisory	PSR	111 min
Aug 24, 5:20 PM MST	Severe Thunderstorm Warning	PSR	55 min
Aug 24, 5:38 PM MST	Severe Thunderstorm Warning	PSR	52 min
Aug 24, 5:44 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 24, 6:43 PM MST	Severe Thunderstorm Warning	PSR	62 min
Aug 24, 6:46 PM MST	Severe Thunderstorm Warning	PSR	44 min
Aug 24, 6:58 PM MST	Severe Thunderstorm Warning	PSR	45 min
Aug 26, 1:44 PM MST	Areal Flood Advisory	PSR	2 hr
Aug 26, 1:49 PM MST	Severe Thunderstorm Warning	PSR	56 min
Aug 27, 6:02 AM MST	Special Weather Statement	PSR	28 min
Aug 27, 7:50 AM MST	Areal Flood Advisory	PSR	115 min
Aug 27, 12:22 PM MST	Areal Flood Advisory	PSR	113 min
Aug 27, 5:53 PM MST	Special Weather Statement	PSR	52 min
Aug 28, 4:26 PM MST	Special Weather Statement	PSR	34 min
Aug 28, 4:38 PM MST	Special Weather Statement	PSR	37 min
Aug 28, 4:56 PM MST	Severe Thunderstorm Warning	PSR	64 min
Aug 28, 5:11 PM MST	Special Weather Statement	PSR	49 min
Aug 28, 5:16 PM MST	Severe Thunderstorm Warning	PSR	44 min
Aug 28, 5:57 PM MST	Severe Thunderstorm Warning	PSR	37 min
Aug 28, 7:03 PM MST	Severe Thunderstorm Warning	PSR	57 min
Aug 29, 11:41 AM MST	Mesoscale Discussion	SPC	94 min
Aug 29, 11:44 AM MST	Mesoscale Discussion	SPC	91 min
Sep 6, 4:01 PM MST	Areal Flood Advisory	PSR	74 min
Sep 21, 4:13 PM MST	Special Weather Statement	PSR	47 min
Sep 21, 4:35 PM MST	Severe Thunderstorm Warning	PSR	40 min
Sep 21, 4:52 PM MST	Areal Flood Advisory	PSR	113 min
Sep 22, 2:23 AM MST	Areal Flood Advisory	PSR	112 min
Sep 22, 4:39 AM MST	Areal Flood Advisory	PSR	111 min
Sep 22, 6:44 AM MST	Flash Flood Warning	PSR	3 hr
Sep 22, 10:08 AM MST	Areal Flood Advisory	PSR	112 min
Oct 2, 9:39 PM MST	Areal Flood Advisory	PSR	111 min
Oct 4, 1:03 PM MST	Special Weather Statement	PSR	42 min
Oct 4, 1:48 PM MST	Special Weather Statement	PSR	57 min
Oct 4, 2:25 PM MST	Severe Thunderstorm Warning	PSR	65 min
Oct 4, 2:26 PM MST	Areal Flood Advisory	PSR	109 min
Oct 4, 2:34 PM MST	Special Weather Statement	PSR	56 min
Oct 4, 2:34 PM MST	Mesoscale Discussion	SPC	116 min
Oct 4, 2:46 PM MST	Severe Thunderstorm Warning	PSR	44 min
Oct 4, 2:47 PM MST	Severe Thunderstorm Warning	PSR	58 min
Oct 4, 2:56 PM MST	Areal Flood Advisory	PSR	109 min
Oct 4, 3:36 PM MST	Special Weather Statement	PSR	54 min
Oct 5, 10:44 AM MST	Mesoscale Discussion	SPC	3 hr
Oct 5, 11:18 AM MST	Special Weather Statement	PSR	42 min
Oct 5, 11:43 AM MST	Severe Thunderstorm Warning	PSR	62 min
Oct 5, 11:52 AM MST	Severe Thunderstorm Watch	SPC	7 hr
Oct 5, 12:21 PM MST	Severe Thunderstorm Warning	PSR	39 min
Oct 5, 12:27 PM MST	Severe Thunderstorm Warning	PSR	63 min
Oct 5, 12:49 PM MST	Areal Flood Advisory	PSR	116 min
Oct 5, 1:03 PM MST	Flash Flood Warning	PSR	95 min
Oct 5, 1:08 PM MST	Severe Thunderstorm Warning	PSR	37 min
Oct 5, 1:17 PM MST	Severe Thunderstorm Warning	PSR	58 min
Oct 5, 1:32 PM MST	Severe Thunderstorm Warning	PSR	58 min
Oct 5, 1:36 PM MST	Flash Flood Warning	PSR	114 min
Oct 5, 2:12 PM MST	Severe Thunderstorm Warning	PSR	33 min
Oct 5, 2:23 PM MST	Severe Thunderstorm Warning	PSR	35 min
Oct 5, 2:47 PM MST	Severe Thunderstorm Warning	PSR	58 min
Oct 5, 3:10 PM MST	Severe Thunderstorm Warning	PSR	65 min
Oct 5, 3:16 PM MST	Mesoscale Discussion	SPC	59 min
Oct 5, 3:35 PM MST	Severe Thunderstorm Warning	PSR	55 min
Oct 5, 3:46 PM MST	Severe Thunderstorm Warning	PSR	59 min
Oct 5, 4:08 PM MST	Severe Thunderstorm Warning	PSR	52 min
Oct 5, 4:12 PM MST	Areal Flood Advisory	PSR	108 min
Oct 5, 4:28 PM MST	Severe Thunderstorm Warning	PSR	23 min
Oct 5, 4:30 PM MST	Flash Flood Warning	PSR	90 min
Oct 5, 4:52 PM MST	Severe Thunderstorm Warning	PSR	53 min
Oct 5, 5:07 PM MST	Flash Flood Warning	PSR	83 min
Oct 5, 6:06 PM MST	Mesoscale Discussion	SPC	54 min
Oct 5, 6:31 PM MST	Areal Flood Advisory	PSR	119 min
Oct 5, 7:52 PM MST	Severe Thunderstorm Warning	PSR	38 min
Oct 5, 8:30 PM MST	Severe Thunderstorm Warning	PSR	55 min
Oct 5, 8:47 PM MST	Areal Flood Advisory	PSR	118 min
Oct 5, 11:57 PM MST	Mesoscale Discussion	SPC	2 hr
Oct 6, 12:09 AM MST	Severe Thunderstorm Warning	PSR	66 min
Oct 6, 3:20 AM MST	Mesoscale Discussion	SPC	115 min
Oct 6, 4:07 AM MST	Severe Thunderstorm Watch	SPC	6 hr
Oct 6, 1:17 PM MST	Severe Thunderstorm Warning	PSR	24 min
Oct 15, 6:48 PM MST	Special Weather Statement	PSR	42 min
Dec 22, 9:53 PM MST	Areal Flood Advisory	PSR	4 hr
Dec 22, 10:56 PM MST	Special Weather Statement	PSR	34 min
Dec 29, 8:36 PM MST	Areal Flood Advisory	PSR	3 hr
Dec 29, 11:47 PM MST	Areal Flood Advisory	PSR	6 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	54
Tornado Warning	3
Severe Thunderstorm Watch	2
Tornado Watch	1
Mesoscale Discussion	15
Special Weather Statement	40
Flooding
Areal Flood Warning	3
Flash Flood Warning	24
River Flood Warning	1
Areal Flood Advisory	62
River Flood Advisory	1
Fire
Red Flag Warning	7
Fire Weather Watch	6

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2009 2011

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.