Alert archive / Arizona / Maricopa County
Weather alerts in Maricopa County, Arizona, 2016
153 weather alerts in 2016, 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 2016. Tap one for its archive.
- Alerts
- 153
- Warnings
- 55
- Watches
- 5
- Advisories
- 55
- Busiest month
- August68 alerts
- Busiest day
- July 30, 201618 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 warnings covering Maricopa County in 2016 had a tornado report inside them.
Maricopa County, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 32 | 9 | 72% | 27 | 52% | 21 min |
| Flash flood warnings | 5 | 4 | 20% | 8 | 38% | 31 min |
Each office's whole area, 2016
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Phoenix, AZ: tornado warnings | 1 | 0 | 100% | 0 | ||
| NWS Phoenix, AZ: severe thunderstorm warnings | 50 | 12 | 76% | 37 | 51% | 20 min |
| NWS Phoenix, AZ: flash flood warnings | 7 | 5 | 29% | 12 | 42% | 34 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 7, 12:15 PM MST | Areal Flood Advisory | PSR | 6 hr |
| Jan 31, 10:06 PM MST | Special Weather Statement | PSR | 84 min |
| Jan 31, 10:17 PM MST | Severe Thunderstorm Warning | PSR | 28 min |
| Jan 31, 10:43 PM MST | Severe Thunderstorm Warning | PSR | 32 min |
| Mar 21, 2:08 AM MST | Fire Weather Watch | PSR | 12 hr |
| Mar 21, 2:06 PM MST | Red Flag Warning | PSR | 30 hr |
| Apr 7, 10:08 PM MST | Special Weather Statement | PSR | 52 min |
| Apr 8, 1:54 PM MST | Special Weather Statement | PSR | 51 min |
| Apr 10, 12:42 PM MST | Areal Flood Advisory | PSR | 2 hr |
| Apr 13, 1:53 PM MST | Fire Weather Watch | PSR | 26 hr |
| Apr 14, 3:28 PM MST | Red Flag Warning | PSR | 29 hr |
| Apr 24, 2:34 AM MST | Fire Weather Watch | PSR | 11 hr |
| Apr 24, 1:35 PM MST | Red Flag Warning | PSR | 30 hr |
| May 3, 3:26 AM MST | Fire Weather Watch | PSR | 24 hr |
| May 4, 3:20 AM MST | Red Flag Warning | PSR | 41 hr |
| Jun 10, 1:41 PM MST | Mesoscale Discussion | SPC | 94 min |
| Jun 11, 12:36 PM MST | Special Weather Statement | PSR | 39 min |
| Jun 11, 1:26 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jun 11, 3:18 PM MST | Special Weather Statement | PSR | 27 min |
| Jun 11, 3:54 PM MST | Special Weather Statement | PSR | 66 min |
| Jun 11, 4:04 PM MST | Severe Thunderstorm Warning | PSR | 26 min |
| Jun 29, 11:17 PM MST | Areal Flood Advisory | PSR | 118 min |
| Jul 1, 2:56 PM MST | Severe Thunderstorm Warning | PSR | 34 min |
| Jul 1, 3:09 PM MST | Severe Thunderstorm Warning | PSR | 36 min |
| Jul 1, 3:24 PM MST | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 3:36 PM MST | Areal Flood Advisory | PSR | 114 min |
| Jul 1, 3:44 PM MST | Severe Thunderstorm Warning | PSR | 31 min |
| Jul 1, 4:26 PM MST | Severe Thunderstorm Warning | PSR | 34 min |
| Jul 1, 4:31 PM MST | Severe Thunderstorm Warning | PSR | 29 min |
| Jul 1, 4:31 PM MST | Severe Thunderstorm Warning | PSR | 44 min |
| Jul 1, 4:58 PM MST | Severe Thunderstorm Warning | PSR | 32 min |
| Jul 1, 5:02 PM MST | Special Weather Statement | PSR | 28 min |
| Jul 1, 5:07 PM MST | Severe Thunderstorm Warning | PSR | 38 min |
| Jul 1, 5:19 PM MST | Areal Flood Advisory | PSR | 116 min |
| Jul 1, 5:28 PM MST | Severe Thunderstorm Warning | PSR | 32 min |
| Jul 1, 5:36 PM MST | Severe Thunderstorm Warning | PSR | 25 min |
| Jul 1, 5:53 PM MST | Special Weather Statement | PSR | 52 min |
| Jul 1, 6:00 PM MST | Severe Thunderstorm Warning | PSR | 30 min |
| Jul 1, 6:05 PM MST | Tornado Warning | PSR | 25 min |
| Jul 1, 6:31 PM MST | Severe Thunderstorm Warning | PSR | 44 min |
| Jul 1, 6:52 PM MST | Areal Flood Advisory | PSR | 113 min |
| Jul 1, 8:02 PM MST | Special Weather Statement | PSR | 28 min |
| Jul 1, 8:31 PM MST | Special Weather Statement | PSR | 44 min |
| Jul 1, 10:17 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 18, 5:03 PM MST | Special Weather Statement | PSR | 27 min |
| Jul 18, 5:29 PM MST | Special Weather Statement | PSR | 31 min |
| Jul 18, 5:35 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 18, 5:37 PM MST | Severe Thunderstorm Warning | PSR | 23 min |
| Jul 18, 5:44 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 18, 5:57 PM MST | Special Weather Statement | PSR | 33 min |
| Jul 18, 6:10 PM MST | Severe Thunderstorm Warning | PSR | 35 min |
| Jul 18, 6:16 PM MST | Flash Flood Warning | PSR | 3 hr |
| Jul 18, 6:43 PM MST | Severe Thunderstorm Warning | PSR | 32 min |
| Jul 18, 6:59 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 18, 7:08 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 19, 4:40 PM MST | Severe Thunderstorm Warning | PSR | 35 min |
| Jul 29, 3:32 PM MST | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 4:58 PM MST | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 29, 7:24 PM MST | Mesoscale Discussion | SPC | 66 min |
| Jul 29, 7:26 PM MST | Special Weather Statement | PSR | 64 min |
| Jul 29, 7:43 PM MST | Severe Thunderstorm Warning | PSR | 32 min |
| Jul 29, 7:46 PM MST | Severe Thunderstorm Warning | PSR | 29 min |
| Jul 29, 8:11 PM MST | Severe Thunderstorm Warning | PSR | 19 min |
| Jul 29, 8:21 PM MST | Severe Thunderstorm Warning | PSR | 39 min |
| Jul 29, 8:27 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 29, 8:29 PM MST | Severe Thunderstorm Warning | PSR | 31 min |
| Jul 29, 9:00 PM MST | Severe Thunderstorm Warning | PSR | 45 min |
| Jul 29, 9:16 PM MST | Severe Thunderstorm Warning | PSR | 44 min |
| Jul 29, 9:22 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 29, 9:43 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 29, 9:59 PM MST | Severe Thunderstorm Warning | PSR | 31 min |
| Jul 29, 10:29 PM MST | Severe Thunderstorm Warning | PSR | 31 min |
| Jul 29, 10:39 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 30, 1:13 AM MST | Areal Flood Warning | PSR | 3 hr |
| Jul 30, 4:02 AM MST | Areal Flood Warning | PSR | 3 hr |
| Jul 30, 6:58 AM MST | Areal Flood Warning | PSR | 3 hr |
| Jul 31, 6:23 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Jul 31, 8:33 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 3:08 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 3:48 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 3:56 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 4:16 PM MST | Flash Flood Warning | PSR | 3 hr |
| Aug 2, 4:28 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 4:43 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 4:58 PM MST | Special Weather Statement | PSR | 47 min |
| Aug 2, 5:12 PM MST | Areal Flood Warning | PSR | 3 hr |
| Aug 2, 5:15 PM MST | Severe Thunderstorm Warning | PSR | 30 min |
| Aug 2, 5:46 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 6:26 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 7:50 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 8:15 PM MST | Areal Flood Warning | PSR | 3 hr |
| Aug 2, 8:15 PM MST | Areal Flood Warning | PSR | 3 hr |
| Aug 3, 1:59 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 3, 2:26 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 3, 9:50 PM MST | Special Weather Statement | PSR | 40 min |
| Aug 4, 5:36 PM MST | Areal Flood Advisory | PSR | 114 min |
| Aug 4, 7:24 PM MST | Special Weather Statement | PSR | 36 min |
| Aug 5, 8:55 AM MST | Areal Flood Advisory | PSR | 2 hr |
| Aug 5, 9:20 AM MST | Flash Flood Warning | PSR | 115 min |
| Aug 5, 11:25 AM MST | Areal Flood Warning | PSR | 3 hr |
| Aug 5, 2:18 PM MST | Areal Flood Warning | PSR | 87 min |
| Aug 9, 11:05 AM MST | Areal Flood Warning | PSR | 4 hr |
| Aug 9, 11:24 AM MST | Areal Flood Advisory | PSR | 2 hr |
| Aug 9, 11:32 AM MST | Areal Flood Advisory | PSR | 118 min |
| Aug 9, 11:53 AM MST | Flash Flood Warning | PSR | 2 hr |
| Aug 9, 12:05 PM MST | Areal Flood Advisory | PSR | 115 min |
| Aug 9, 7:54 PM MST | Special Weather Statement | PSR | 51 min |
| Aug 9, 8:20 PM MST | Severe Thunderstorm Warning | PSR | 25 min |
| Aug 9, 8:44 PM MST | Special Weather Statement | PSR | 46 min |
| Aug 9, 9:10 PM MST | Areal Flood Advisory | PSR | 2 hr |
| Aug 10, 7:24 AM MST | Areal Flood Advisory | PSR | 2 hr |
| Aug 10, 1:49 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 10, 7:44 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 10, 8:11 PM MST | Areal Flood Advisory | PSR | 2 hr |
| Aug 10, 8:30 PM MST | Special Weather Statement | PSR | 45 min |
| Aug 10, 8:33 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 10, 8:41 PM MST | Areal Flood Warning | PSR | 2 hr |
| Aug 10, 9:13 PM MST | Special Weather Statement | PSR | 32 min |
| Aug 11, 4:02 AM MST | Areal Flood Advisory | PSR | 118 min |
| Aug 11, 5:43 AM MST | Areal Flood Advisory | PSR | 2 hr |
| Aug 11, 7:26 AM MST | Areal Flood Warning | PSR | 5 hr |
| Aug 11, 8:05 AM MST | Areal Flood Advisory | PSR | 4 hr |
| Aug 11, 8:53 AM MST | Areal Flood Warning | PSR | 5 hr |
| Aug 11, 8:57 AM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 11, 11:07 AM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 12, 3:19 PM MST | Special Weather Statement | PSR | 41 min |
| Aug 12, 4:41 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 16, 3:19 PM MST | Special Weather Statement | PSR | 56 min |
| Aug 18, 12:30 AM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 18, 1:30 AM MST | Flash Flood Warning | PSR | 4 hr |
| Aug 19, 4:47 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 19, 8:19 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 19, 8:50 PM MST | Areal Flood Warning | PSR | 3 hr |
| Aug 20, 4:55 PM MST | Mesoscale Discussion | SPC | 2 hr |
| Aug 20, 6:16 PM MST | Special Weather Statement | PSR | 74 min |
| Aug 20, 6:22 PM MST | Severe Thunderstorm Warning | PSR | 23 min |
| Aug 20, 9:06 PM MST | Areal Flood Advisory | PSR | 114 min |
| Aug 21, 5:41 PM MST | Severe Thunderstorm Warning | PSR | 22 min |
| Aug 22, 2:22 PM MST | Special Weather Statement | PSR | 38 min |
| Aug 22, 2:36 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Aug 22, 2:56 PM MST | Special Weather Statement | PSR | 34 min |
| Aug 22, 3:36 PM MST | Special Weather Statement | PSR | 39 min |
| Aug 24, 5:30 PM MST | Special Weather Statement | PSR | 45 min |
| Aug 26, 10:44 PM MST | Special Weather Statement | PSR | 46 min |
| Sep 1, 5:31 PM MST | Areal Flood Advisory | PSR | 119 min |
| Sep 7, 6:57 AM MST | Areal Flood Advisory | PSR | 3 hr |
| Sep 7, 12:45 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Sep 7, 4:01 PM MST | Areal Flood Advisory | PSR | 3 hr |
| Sep 22, 2:18 PM MST | Special Weather Statement | PSR | 42 min |
| Sep 22, 3:35 PM MST | Special Weather Statement | PSR | 40 min |
| Oct 2, 5:53 AM MST | Special Weather Statement | PSR | 37 min |
| Nov 3, 2:47 PM MST | Special Weather Statement | PSR | 58 min |
| Dec 22, 10:39 AM MST | Areal Flood Advisory | PSR | 66 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 | 32 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 5 |
| Special Weather Statement | 33 |
| Flooding | |
| Areal Flood Warning | 13 |
| Flash Flood Warning | 5 |
| Areal Flood Advisory | 55 |
| Fire | |
| Red Flag Warning | 4 |
| Fire Weather Watch | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20152017
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.