Alert archive / Arizona / Pima County
Weather alerts in Pima County, Arizona, 2009
79 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Pima County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 79
- Warnings
- 39
- Watches
- 0
- Advisories
- 36
- Busiest month
- July53 alerts
- Busiest day
- July 4, 20097 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Pima County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 24 | 7 | 71% | 25 | 52% | 15 min |
| Flash flood warnings | 14 | 3 | 79% | 5 | 60% | 15 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Tucson, AZ: tornado warnings | 0 | 1 | 0% | |||
| NWS Tucson, AZ: severe thunderstorm warnings | 44 | 12 | 73% | 38 | 55% | 14 min |
| NWS Tucson, AZ: flash flood warnings | 20 | 3 | 85% | 7 | 43% | 15 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 |
|---|---|---|---|
| May 18, 6:45 PM MST | Severe Thunderstorm Warning | TWC | 15 min |
| Jun 29, 4:41 PM MST | Mesoscale Discussion | SPC | 2 hr |
| Jun 29, 6:08 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jun 29, 6:27 PM MST | Severe Thunderstorm Warning | TWC | 33 min |
| Jun 30, 6:42 PM MST | Severe Thunderstorm Warning | TWC | 42 min |
| Jun 30, 7:04 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jun 30, 7:24 PM MST | Flash Flood Warning | TWC | 81 min |
| Jun 30, 7:39 PM MST | Severe Thunderstorm Warning | TWC | 36 min |
| Jun 30, 7:54 PM MST | Flash Flood Warning | TWC | 81 min |
| Jul 1, 4:59 PM MST | Areal Flood Advisory | TWC | 113 min |
| Jul 2, 3:44 PM MST | Areal Flood Advisory | TWC | 4 hr |
| Jul 2, 5:30 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 3, 2:21 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 3, 4:43 PM MST | Areal Flood Advisory | TWC | 4 hr |
| Jul 3, 5:16 PM MST | Flash Flood Warning | TWC | 119 min |
| Jul 3, 6:06 PM MST | Flash Flood Warning | TWC | 114 min |
| Jul 3, 7:33 PM MST | Severe Thunderstorm Warning | TWC | 42 min |
| Jul 3, 7:58 PM MST | Flash Flood Warning | TWC | 2 hr |
| Jul 3, 8:30 PM MST | Areal Flood Advisory | TWC | 6 hr |
| Jul 3, 10:16 PM MST | Flash Flood Warning | TWC | 119 min |
| Jul 3, 11:31 PM MST | Flash Flood Warning | TWC | 119 min |
| Jul 7, 2:42 PM MST | Severe Thunderstorm Warning | TWC | 21 min |
| Jul 7, 3:21 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 7, 5:29 PM MST | Severe Thunderstorm Warning | TWC | 31 min |
| Jul 7, 5:59 PM MST | Severe Thunderstorm Warning | TWC | 31 min |
| Jul 7, 6:30 PM MST | Areal Flood Advisory | TWC | 91 min |
| Jul 7, 6:53 PM MST | Special Weather Statement | TWC | 52 min |
| Jul 8, 4:24 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 8, 4:53 PM MST | Severe Thunderstorm Warning | TWC | 37 min |
| Jul 8, 4:58 PM MST | Flash Flood Warning | TWC | 62 min |
| Jul 8, 5:29 PM MST | Severe Thunderstorm Warning | TWC | 31 min |
| Jul 8, 5:40 PM MST | Flash Flood Warning | TWC | 95 min |
| Jul 8, 7:06 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 10, 6:52 PM MST | Severe Thunderstorm Warning | TWC | 38 min |
| Jul 10, 7:17 PM MST | Areal Flood Advisory | TWC | 2 hr |
| Jul 17, 5:46 PM MST | Severe Thunderstorm Warning | TWC | 44 min |
| Jul 17, 6:19 PM MST | Severe Thunderstorm Warning | TWC | 56 min |
| Jul 17, 6:42 PM MST | Severe Thunderstorm Warning | TWC | 48 min |
| Jul 17, 7:48 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 18, 1:56 PM MST | Severe Thunderstorm Warning | TWC | 49 min |
| Jul 19, 4:28 PM MST | Severe Thunderstorm Warning | TWC | 47 min |
| Jul 19, 4:55 PM MST | Severe Thunderstorm Warning | TWC | 65 min |
| Jul 19, 5:23 PM MST | Severe Thunderstorm Warning | TWC | 52 min |
| Jul 19, 6:06 PM MST | Severe Thunderstorm Warning | TWC | 39 min |
| Jul 19, 6:24 PM MST | Flash Flood Warning | TWC | 111 min |
| Jul 20, 4:25 PM MST | Severe Thunderstorm Warning | TWC | 65 min |
| Jul 20, 5:19 PM MST | Severe Thunderstorm Warning | TWC | 41 min |
| Jul 20, 6:29 PM MST | Severe Thunderstorm Warning | TWC | 46 min |
| Jul 20, 6:56 PM MST | Areal Flood Advisory | TWC | 4 hr |
| Jul 20, 7:36 PM MST | Flash Flood Warning | TWC | 114 min |
| Jul 21, 5:51 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 22, 1:50 PM MST | Areal Flood Advisory | TWC | 59 min |
| Jul 22, 4:17 PM MST | Areal Flood Advisory | TWC | 53 min |
| Jul 22, 5:08 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Jul 24, 1:29 PM MST | Areal Flood Warning | TWC | 5 min |
| Jul 24, 1:31 PM MST | Flash Flood Warning | TWC | 2 hr |
| Jul 25, 5:17 PM MST | Areal Flood Advisory | TWC | 3 hr |
| Aug 5, 7:00 PM MST | Areal Flood Advisory | TWC | 90 min |
| Aug 5, 8:25 PM MST | Areal Flood Advisory | TWC | 80 min |
| Aug 12, 7:37 PM MST | Special Weather Statement | TWC | 53 min |
| Aug 21, 2:36 PM MST | Severe Thunderstorm Warning | TWC | 39 min |
| Aug 21, 3:10 PM MST | Mesoscale Discussion | SPC | 65 min |
| Aug 22, 11:56 AM MST | Areal Flood Advisory | TWC | 94 min |
| Aug 22, 12:49 PM MST | Areal Flood Advisory | TWC | 116 min |
| Aug 23, 4:05 PM MST | Areal Flood Advisory | TWC | 85 min |
| Sep 3, 5:47 PM MST | Areal Flood Advisory | TWC | 70 min |
| Sep 3, 6:53 PM MST | Areal Flood Advisory | TWC | 82 min |
| Sep 4, 6:54 PM MST | Areal Flood Advisory | TWC | 111 min |
| Sep 5, 4:38 PM MST | Areal Flood Advisory | TWC | 112 min |
| Sep 5, 4:43 PM MST | Severe Thunderstorm Warning | TWC | 47 min |
| Sep 5, 5:07 PM MST | Areal Flood Advisory | TWC | 83 min |
| Sep 5, 5:50 PM MST | Flash Flood Warning | TWC | 115 min |
| Sep 5, 6:31 PM MST | Areal Flood Advisory | TWC | 21 min |
| Sep 5, 6:49 PM MST | Flash Flood Warning | TWC | 80 min |
| Sep 6, 7:45 PM MST | Areal Flood Advisory | TWC | 90 min |
| Sep 6, 9:17 PM MST | Areal Flood Advisory | TWC | 50 min |
| Sep 8, 12:58 PM MST | Areal Flood Advisory | TWC | 105 min |
| Sep 8, 6:59 PM MST | Areal Flood Advisory | TWC | 2 hr |
| Sep 8, 9:45 PM MST | Areal Flood Advisory | TWC | 2 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 | 24 |
| Mesoscale Discussion | 2 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 14 |
| Areal Flood Advisory | 36 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.