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

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings10550%683%21 min
Flash flood warnings5340%5100%68 min

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Phoenix, AZ: tornado warnings010%
NWS Phoenix, AZ: severe thunderstorm warnings792865%9249%17 min
NWS Phoenix, AZ: flash flood warnings753751%7281%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.

IssuedProductOfficeLasted
Dec 31, 9:35 PM PSTAreal Flood AdvisoryPSR3 hr
Mar 27, 4:30 AM PDTFire Weather WatchPSR8 hr
Mar 27, 12:52 PM PDTRed Flag WarningPSR30 hr
Mar 30, 2:56 AM PDTRed Flag WarningPSR17 hr
Apr 7, 2:02 PM PDTWind AdvisoryPSR33 hr
Apr 12, 10:15 AM PDTWind AdvisoryPSR37 hr
Apr 22, 1:26 PM PDTWind AdvisoryPSR43 hr
Apr 24, 5:40 AM PDTWind AdvisoryPSR28 hr
Apr 26, 2:12 PM PDTFire Weather WatchPSR13 hr
Apr 27, 3:40 AM PDTRed Flag WarningPSR41 hr
Apr 27, 1:42 PM PDTWind AdvisoryPSR30 hr
Apr 28, 2:25 PM PDTRed Flag WarningPSR29 hr
May 5, 2:24 AM PDTWind AdvisoryPSR47 hr
May 6, 4:15 PM PDTBlowing Dust AdvisoryPSR4 hr
May 6, 5:46 PM PDTHigh Wind WarningPSR2 hr
May 7, 1:03 AM PDTWind AdvisoryPSR114 min
May 15, 6:35 PM PDTWind AdvisoryPSR4 hr
May 17, 7:53 AM PDTWind AdvisoryPSR15 hr
May 18, 9:17 PM PDTWind AdvisoryPSR5 hr
May 23, 3:05 AM PDTExcessive Heat WarningPSR17 hr
May 24, 2:42 AM PDTWind AdvisoryPSR50 hr
May 26, 11:13 AM PDTWind AdvisoryPSR15 hr
Jun 10, 1:13 PM PDTWind AdvisoryPSR32 hr
Jun 12, 2:45 AM PDTExcessive Heat WatchPSR75 days
Jun 14, 2:50 AM PDTExcessive Heat WarningPSR13 days
Jul 4, 2:07 AM PDTExcessive Heat WatchPSR12 hr
Jul 4, 2:13 PM PDTExcessive Heat WarningPSR3 days
Jul 8, 7:10 PM PDTBlowing Dust AdvisoryPSR3 hr
Jul 24, 12:23 AM PDTAreal Flood AdvisoryPSR3 hr
Aug 2, 2:39 PM PDTAreal Flood AdvisoryPSR3 hr
Aug 2, 2:53 PM PDTSpecial Weather StatementPSR52 min
Aug 2, 3:06 PM PDTSpecial Weather StatementPSR24 min
Aug 2, 3:28 PM PDTAreal Flood AdvisoryPSR3 hr
Aug 2, 3:38 PM PDTSpecial Weather StatementPSR52 min
Aug 2, 3:43 PM PDTAreal Flood AdvisoryPSR2 hr
Aug 2, 4:13 PM PDTFlash Flood WarningPSR3 hr
Aug 2, 4:21 PM PDTSpecial Weather StatementPSR24 min
Aug 2, 5:33 PM PDTSevere Thunderstorm WarningPSR42 min
Aug 2, 5:42 PM PDTBlowing Dust AdvisoryPSR78 min
Aug 3, 2:16 PM PDTSpecial Weather StatementPSR44 min
Aug 3, 2:45 PM PDTSpecial Weather StatementPSR30 min
Aug 3, 3:01 PM PDTSpecial Weather StatementPSR44 min
Aug 3, 3:24 PM PDTSevere Thunderstorm WarningPSR36 min
Aug 3, 3:57 PM PDTSpecial Weather StatementPSR48 min
Aug 3, 4:19 PM PDTAreal Flood AdvisoryPSR56 min
Aug 3, 4:22 PM PDTSpecial Weather StatementPSR53 min
Aug 3, 5:01 PM PDTFlash Flood WarningPSR3 hr
Aug 3, 5:06 PM PDTSpecial Weather StatementPSR39 min
Aug 3, 5:31 PM PDTSpecial Weather StatementPSR44 min
Aug 3, 5:50 PM PDTAreal Flood AdvisoryPSR3 hr
Aug 4, 1:32 PM PDTSpecial Weather StatementPSR28 min
Aug 4, 2:03 PM PDTSpecial Weather StatementPSR27 min
Aug 4, 2:05 PM PDTSpecial Weather StatementPSR40 min
Aug 4, 2:48 PM PDTAreal Flood AdvisoryPSR3 hr
Aug 4, 2:52 PM PDTAreal Flood AdvisoryPSR3 hr
Aug 4, 2:57 PM PDTSpecial Weather StatementPSR48 min
Aug 26, 2:50 AM PDTExcessive Heat WarningPSR5 days
Sep 2, 3:55 PM PDTAreal Flood AdvisoryPSR3 hr
Sep 6, 6:02 PM PDTSevere Thunderstorm WarningPSR38 min
Sep 7, 2:10 PM PDTFlash Flood WatchPSR54 hr
Sep 7, 4:34 PM PDTDust Storm WarningPSR86 min
Sep 7, 4:42 PM PDTSevere Thunderstorm WarningPSR63 min
Sep 7, 6:44 PM PDTFlash Flood WarningPSR3 hr
Sep 7, 8:06 PM PDTSevere Thunderstorm WarningPSR54 min
Sep 7, 9:12 PM PDTBlowing Dust AdvisoryPSR108 min
Sep 7, 9:27 PM PDTAreal Flood AdvisoryPSR3 hr
Sep 8, 1:04 PM PDTSpecial Weather StatementPSR41 min
Sep 8, 1:09 PM PDTBlowing Dust AdvisoryPSR7 hr
Sep 8, 1:38 PM PDTSevere Thunderstorm WarningPSR37 min
Sep 8, 2:10 PM PDTSpecial Weather StatementPSR50 min
Sep 8, 2:15 PM PDTMesoscale DiscussionSPC3 hr
Sep 8, 2:16 PM PDTFlash Flood WarningPSR3 hr
Sep 8, 2:23 PM PDTSevere Thunderstorm WarningPSR37 min
Sep 8, 2:55 PM PDTSevere Thunderstorm WarningPSR35 min
Sep 8, 3:40 PM PDTDust Storm WarningPSR80 min
Sep 8, 4:07 PM PDTSevere Thunderstorm WarningPSR23 min
Sep 8, 4:17 PM PDTSpecial Weather StatementPSR28 min
Sep 8, 5:12 PM PDTSevere Thunderstorm WarningPSR48 min
Sep 9, 9:37 AM PDTFlash Flood WarningPSR3 hr
Sep 9, 9:43 AM PDTAreal Flood AdvisoryPSR3 hr
Sep 9, 6:06 PM PDTSpecial Weather StatementPSR39 min
Sep 9, 6:41 PM PDTSpecial Weather StatementPSR49 min
Sep 9, 7:08 PM PDTAreal Flood AdvisoryPSR3 hr
Sep 20, 2:31 PM PDTWind AdvisoryPSR38 hr
Oct 7, 1:34 PM PDTWind AdvisoryPSR48 hr
Oct 19, 2:05 PM PDTWind AdvisoryPSR33 hr
Oct 20, 11:15 AM PDTBlowing Dust AdvisoryPSR7 hr
Nov 26, 12:51 PM PSTWind AdvisoryPSR27 hr
Dec 7, 2:26 AM PSTWind AdvisoryPSR10 hr
Dec 7, 2:28 AM PSTRed Flag WarningPSR13 hr
Dec 14, 1:29 AM PSTWind AdvisoryPSR15 hr
Dec 14, 1:41 AM PSTRed Flag WarningPSR14 hr
Dec 19, 2:41 AM PSTWind AdvisoryPSR60 hr
Dec 21, 10:28 AM PSTBlowing Dust AdvisoryPSR6 hr

By product

Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.

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.