Alert archive / California / Imperial County
Weather alerts in Imperial County, California, 2017
94 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Imperial County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 94
- Warnings
- 28
- Watches
- 5
- Advisories
- 40
- Busiest month
- August28 alerts
- Busiest day
- September 8, 201715 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Imperial County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 5 | 50% | 6 | 83% | 21 min |
| Flash flood warnings | 5 | 3 | 40% | 5 | 100% | 68 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Phoenix, AZ: tornado warnings | 0 | 1 | 0% | |||
| NWS Phoenix, AZ: severe thunderstorm warnings | 79 | 28 | 65% | 92 | 49% | 17 min |
| NWS Phoenix, AZ: flash flood warnings | 75 | 37 | 51% | 72 | 81% | 86 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, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Dec 31, 9:35 PM PST | Areal Flood Advisory | PSR | 3 hr |
| Mar 27, 4:30 AM PDT | Fire Weather Watch | PSR | 8 hr |
| Mar 27, 12:52 PM PDT | Red Flag Warning | PSR | 30 hr |
| Mar 30, 2:56 AM PDT | Red Flag Warning | PSR | 17 hr |
| Apr 7, 2:02 PM PDT | Wind Advisory | PSR | 33 hr |
| Apr 12, 10:15 AM PDT | Wind Advisory | PSR | 37 hr |
| Apr 22, 1:26 PM PDT | Wind Advisory | PSR | 43 hr |
| Apr 24, 5:40 AM PDT | Wind Advisory | PSR | 28 hr |
| Apr 26, 2:12 PM PDT | Fire Weather Watch | PSR | 13 hr |
| Apr 27, 3:40 AM PDT | Red Flag Warning | PSR | 41 hr |
| Apr 27, 1:42 PM PDT | Wind Advisory | PSR | 30 hr |
| Apr 28, 2:25 PM PDT | Red Flag Warning | PSR | 29 hr |
| May 5, 2:24 AM PDT | Wind Advisory | PSR | 47 hr |
| May 6, 4:15 PM PDT | Blowing Dust Advisory | PSR | 4 hr |
| May 6, 5:46 PM PDT | High Wind Warning | PSR | 2 hr |
| May 7, 1:03 AM PDT | Wind Advisory | PSR | 114 min |
| May 15, 6:35 PM PDT | Wind Advisory | PSR | 4 hr |
| May 17, 7:53 AM PDT | Wind Advisory | PSR | 15 hr |
| May 18, 9:17 PM PDT | Wind Advisory | PSR | 5 hr |
| May 23, 3:05 AM PDT | Excessive Heat Warning | PSR | 17 hr |
| May 24, 2:42 AM PDT | Wind Advisory | PSR | 50 hr |
| May 26, 11:13 AM PDT | Wind Advisory | PSR | 15 hr |
| Jun 10, 1:13 PM PDT | Wind Advisory | PSR | 32 hr |
| Jun 12, 2:45 AM PDT | Excessive Heat Watch | PSR | 75 days |
| Jun 14, 2:50 AM PDT | Excessive Heat Warning | PSR | 13 days |
| Jul 4, 2:07 AM PDT | Excessive Heat Watch | PSR | 12 hr |
| Jul 4, 2:13 PM PDT | Excessive Heat Warning | PSR | 3 days |
| Jul 8, 7:10 PM PDT | Blowing Dust Advisory | PSR | 3 hr |
| Jul 24, 12:23 AM PDT | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 2:39 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 2:53 PM PDT | Special Weather Statement | PSR | 52 min |
| Aug 2, 3:06 PM PDT | Special Weather Statement | PSR | 24 min |
| Aug 2, 3:28 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Aug 2, 3:38 PM PDT | Special Weather Statement | PSR | 52 min |
| Aug 2, 3:43 PM PDT | Areal Flood Advisory | PSR | 2 hr |
| Aug 2, 4:13 PM PDT | Flash Flood Warning | PSR | 3 hr |
| Aug 2, 4:21 PM PDT | Special Weather Statement | PSR | 24 min |
| Aug 2, 5:33 PM PDT | Severe Thunderstorm Warning | PSR | 42 min |
| Aug 2, 5:42 PM PDT | Blowing Dust Advisory | PSR | 78 min |
| Aug 3, 2:16 PM PDT | Special Weather Statement | PSR | 44 min |
| Aug 3, 2:45 PM PDT | Special Weather Statement | PSR | 30 min |
| Aug 3, 3:01 PM PDT | Special Weather Statement | PSR | 44 min |
| Aug 3, 3:24 PM PDT | Severe Thunderstorm Warning | PSR | 36 min |
| Aug 3, 3:57 PM PDT | Special Weather Statement | PSR | 48 min |
| Aug 3, 4:19 PM PDT | Areal Flood Advisory | PSR | 56 min |
| Aug 3, 4:22 PM PDT | Special Weather Statement | PSR | 53 min |
| Aug 3, 5:01 PM PDT | Flash Flood Warning | PSR | 3 hr |
| Aug 3, 5:06 PM PDT | Special Weather Statement | PSR | 39 min |
| Aug 3, 5:31 PM PDT | Special Weather Statement | PSR | 44 min |
| Aug 3, 5:50 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Aug 4, 1:32 PM PDT | Special Weather Statement | PSR | 28 min |
| Aug 4, 2:03 PM PDT | Special Weather Statement | PSR | 27 min |
| Aug 4, 2:05 PM PDT | Special Weather Statement | PSR | 40 min |
| Aug 4, 2:48 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Aug 4, 2:52 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Aug 4, 2:57 PM PDT | Special Weather Statement | PSR | 48 min |
| Aug 26, 2:50 AM PDT | Excessive Heat Warning | PSR | 5 days |
| Sep 2, 3:55 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Sep 6, 6:02 PM PDT | Severe Thunderstorm Warning | PSR | 38 min |
| Sep 7, 2:10 PM PDT | Flash Flood Watch | PSR | 54 hr |
| Sep 7, 4:34 PM PDT | Dust Storm Warning | PSR | 86 min |
| Sep 7, 4:42 PM PDT | Severe Thunderstorm Warning | PSR | 63 min |
| Sep 7, 6:44 PM PDT | Flash Flood Warning | PSR | 3 hr |
| Sep 7, 8:06 PM PDT | Severe Thunderstorm Warning | PSR | 54 min |
| Sep 7, 9:12 PM PDT | Blowing Dust Advisory | PSR | 108 min |
| Sep 7, 9:27 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Sep 8, 1:04 PM PDT | Special Weather Statement | PSR | 41 min |
| Sep 8, 1:09 PM PDT | Blowing Dust Advisory | PSR | 7 hr |
| Sep 8, 1:38 PM PDT | Severe Thunderstorm Warning | PSR | 37 min |
| Sep 8, 2:10 PM PDT | Special Weather Statement | PSR | 50 min |
| Sep 8, 2:15 PM PDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 8, 2:16 PM PDT | Flash Flood Warning | PSR | 3 hr |
| Sep 8, 2:23 PM PDT | Severe Thunderstorm Warning | PSR | 37 min |
| Sep 8, 2:55 PM PDT | Severe Thunderstorm Warning | PSR | 35 min |
| Sep 8, 3:40 PM PDT | Dust Storm Warning | PSR | 80 min |
| Sep 8, 4:07 PM PDT | Severe Thunderstorm Warning | PSR | 23 min |
| Sep 8, 4:17 PM PDT | Special Weather Statement | PSR | 28 min |
| Sep 8, 5:12 PM PDT | Severe Thunderstorm Warning | PSR | 48 min |
| Sep 9, 9:37 AM PDT | Flash Flood Warning | PSR | 3 hr |
| Sep 9, 9:43 AM PDT | Areal Flood Advisory | PSR | 3 hr |
| Sep 9, 6:06 PM PDT | Special Weather Statement | PSR | 39 min |
| Sep 9, 6:41 PM PDT | Special Weather Statement | PSR | 49 min |
| Sep 9, 7:08 PM PDT | Areal Flood Advisory | PSR | 3 hr |
| Sep 20, 2:31 PM PDT | Wind Advisory | PSR | 38 hr |
| Oct 7, 1:34 PM PDT | Wind Advisory | PSR | 48 hr |
| Oct 19, 2:05 PM PDT | Wind Advisory | PSR | 33 hr |
| Oct 20, 11:15 AM PDT | Blowing Dust Advisory | PSR | 7 hr |
| Nov 26, 12:51 PM PST | Wind Advisory | PSR | 27 hr |
| Dec 7, 2:26 AM PST | Wind Advisory | PSR | 10 hr |
| Dec 7, 2:28 AM PST | Red Flag Warning | PSR | 13 hr |
| Dec 14, 1:29 AM PST | Wind Advisory | PSR | 15 hr |
| Dec 14, 1:41 AM PST | Red Flag Warning | PSR | 14 hr |
| Dec 19, 2:41 AM PST | Wind Advisory | PSR | 60 hr |
| Dec 21, 10:28 AM PST | Blowing Dust 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 | 10 |
| Mesoscale Discussion | 1 |
| Special Weather Statement | 20 |
| Flooding | |
| Flash Flood Warning | 5 |
| Flash Flood Watch | 1 |
| Areal Flood Advisory | 13 |
| Heat | |
| Excessive Heat Warning | 4 |
| Excessive Heat Watch | 2 |
| Wind and dust | |
| Dust Storm Warning | 2 |
| High Wind Warning | 1 |
| Blowing Dust Advisory | 7 |
| Wind Advisory | 20 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.