Alert archive / California / Imperial County
Weather alerts in Imperial County, California, 2010
49 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 49
- Warnings
- 15
- Watches
- 5
- Advisories
- 10
- Busiest month
- January13 alerts
- Busiest day
- January 21, 201011 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 1 tornado warnings covering Imperial County in 2010 had a tornado report inside them.
Imperial County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 1 | 0% | 0 | ||
| Severe thunderstorm warnings | 6 | 3 | 50% | 2 | 100% | 28 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
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, Pacific Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 19, 4:35 PM PST | Mesoscale Discussion | SPC | 115 min |
| Jan 21, 6:34 AM PST | Areal Flood Advisory | PSR | 101 min |
| Jan 21, 8:29 AM PST | Areal Flood Advisory | PSR | 106 min |
| Jan 21, 9:54 AM PST | Flash Flood Warning | PSR | 2 hr |
| Jan 21, 10:47 AM PST | Areal Flood Advisory | PSR | 118 min |
| Jan 21, 12:02 PM PST | Flash Flood Warning | PSR | 3 hr |
| Jan 21, 2:34 PM PST | Mesoscale Discussion | SPC | 56 min |
| Jan 21, 2:44 PM PST | Special Weather Statement | PSR | 61 min |
| Jan 21, 3:12 PM PST | Tornado Watch | SPC | 9 hr |
| Jan 21, 3:14 PM PST | Tornado Warning | PSR | 46 min |
| Jan 21, 3:31 PM PST | Severe Thunderstorm Warning | PSR | 59 min |
| Jan 21, 3:47 PM PST | Severe Thunderstorm Warning | PSR | 45 min |
| Jan 26, 11:10 PM PST | Areal Flood Advisory | PSR | 58 min |
| Mar 7, 7:08 AM PST | Areal Flood Advisory | PSR | 3 hr |
| Mar 7, 10:16 AM PST | Areal Flood Advisory | PSR | 104 min |
| Mar 7, 12:21 PM PST | Areal Flood Advisory | PSR | 3 hr |
| Apr 27, 3:13 PM PDT | Red Flag Warning | PSR | 29 hr |
| Apr 29, 1:52 PM PDT | Red Flag Warning | PSR | 6 hr |
| Apr 30, 1:15 PM PDT | Fire Weather Watch | PSR | 24 hr |
| May 1, 1:33 PM PDT | Red Flag Warning | PSR | 29 hr |
| May 7, 2:25 PM PDT | Fire Weather Watch | PSR | 24 hr |
| May 8, 2:42 PM PDT | Red Flag Warning | PSR | 32 hr |
| May 21, 2:06 PM PDT | Fire Weather Watch | PSR | 15 hr |
| May 21, 2:06 PM PDT | Fire Weather Watch | PSR | 15 hr |
| May 22, 5:19 AM PDT | Red Flag Warning | PSR | 14 hr |
| May 22, 5:19 AM PDT | Red Flag Warning | PSR | 39 hr |
| Jul 15, 1:25 PM PDT | Special Weather Statement | PSR | 50 min |
| Aug 17, 3:09 PM PDT | Mesoscale Discussion | SPC | 96 min |
| Aug 26, 7:32 PM PDT | Severe Thunderstorm Warning | PSR | 58 min |
| Aug 26, 8:13 PM PDT | Areal Flood Advisory | PSR | 107 min |
| Aug 26, 9:45 PM PDT | Special Weather Statement | PSR | 90 min |
| Aug 27, 3:18 PM PDT | Special Weather Statement | PSR | 72 min |
| Aug 27, 3:35 PM PDT | Special Weather Statement | PSR | 55 min |
| Aug 27, 3:54 PM PDT | Special Weather Statement | PSR | 51 min |
| Aug 27, 4:02 PM PDT | Severe Thunderstorm Warning | PSR | 59 min |
| Aug 27, 4:34 PM PDT | Severe Thunderstorm Warning | PSR | 56 min |
| Sep 30, 1:52 AM PDT | Special Weather Statement | PSR | 53 min |
| Oct 1, 1:21 PM PDT | Mesoscale Discussion | SPC | 84 min |
| Oct 2, 6:22 AM PDT | Special Weather Statement | PSR | 38 min |
| Oct 2, 6:36 AM PDT | Special Weather Statement | PSR | 24 min |
| Oct 2, 7:42 AM PDT | Areal Flood Advisory | PSR | 108 min |
| Oct 2, 8:24 AM PDT | Severe Thunderstorm Warning | PSR | 51 min |
| Oct 2, 9:32 AM PDT | Areal Flood Advisory | PSR | 118 min |
| Oct 3, 4:15 AM PDT | Special Weather Statement | PSR | 45 min |
| Oct 3, 6:39 AM PDT | Special Weather Statement | PSR | 51 min |
| Oct 4, 2:34 PM PDT | Mesoscale Discussion | SPC | 116 min |
| Oct 4, 2:45 PM PDT | Special Weather Statement | PSR | 45 min |
| Oct 19, 11:46 AM PDT | Mesoscale Discussion | SPC | 89 min |
| Dec 22, 12:37 PM PST | Mesoscale Discussion | SPC | 83 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 | 6 |
| Tornado Warning | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 7 |
| Special Weather Statement | 12 |
| Flooding | |
| Flash Flood Warning | 2 |
| Areal Flood Advisory | 10 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 4 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.