Alert archive / California / Imperial County

Weather alerts in Imperial County, California, 2020

102 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts: 102
Warnings: 30
Watches: 13
Advisories: 50
Busiest month: March21 alerts
Busiest day: March 12, 20208 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, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	1	0	100%	0
Flash flood warnings	7	2	71%	4	75%	91 min

Each office's whole area, 2020

	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	43	13	70%	41	71%	15 min
NWS Phoenix, AZ: flash flood warnings	47	15	68%	23	87%	100 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 9, 3:14 AM PST	Wind Advisory	PSR	16 hr
Jan 21, 7:54 PM PST	Dense Fog Advisory	PSR	14 hr
Jan 28, 2:09 AM PST	Wind Advisory	PSR	39 hr
Feb 1, 1:14 PM PST	High Wind Warning	PSR	41 hr
Feb 1, 1:14 PM PST	Wind Advisory	PSR	51 hr
Feb 3, 3:18 AM PST	Wind Advisory	PSR	40 hr
Feb 10, 11:54 AM PST	Wind Advisory	PSR	25 hr
Feb 10, 12:14 PM PST	Areal Flood Advisory	PSR	4 hr
Feb 10, 1:40 PM PST	Areal Flood Advisory	PSR	3 hr
Feb 11, 3:30 AM PST	Dense Fog Advisory	PSR	4 hr
Feb 22, 2:11 AM PST	Wind Advisory	PSR	26 hr
Feb 24, 12:23 PM PST	Wind Advisory	PSR	29 hr
Feb 29, 2:49 AM PST	Wind Advisory	PSR	48 hr
Mar 2, 2:26 PM PST	Areal Flood Advisory	PSR	3 hr
Mar 10, 6:50 PM PDT	Flash Flood Warning Considerable damage threat	PSR	4 hr
Mar 10, 7:04 PM PDT	Areal Flood Advisory	PSR	4 hr
Mar 11, 3:59 AM PDT	Flash Flood Watch	PSR	64 hr
Mar 11, 6:25 AM PDT	Dense Fog Advisory	PSR	4 hr
Mar 12, 7:02 AM PDT	Areal Flood Advisory	PSR	3 hr
Mar 12, 2:45 PM PDT	Flash Flood Warning Considerable damage threat	PSR	4 hr
Mar 12, 2:57 PM PDT	Special Weather Statement	PSR	48 min
Mar 12, 3:19 PM PDT	Severe Thunderstorm Warning	PSR	26 min
Mar 12, 4:06 PM PDT	Mesoscale Discussion	SPC	84 min
Mar 12, 4:10 PM PDT	Special Weather Statement	PSR	35 min
Mar 12, 4:23 PM PDT	Flash Flood Warning Considerable damage threat	PSR	4 hr
Mar 12, 4:53 PM PDT	Special Weather Statement	PSR	52 min
Mar 12, 5:01 PM PDT	Flash Flood Warning Considerable damage threat	PSR	3 hr
Mar 12, 5:45 PM PDT	Flash Flood Warning Considerable damage threat	PSR	4 hr
Mar 12, 6:40 PM PDT	Areal Flood Warning	PSR	6 hr
Mar 12, 6:48 PM PDT	Flash Flood Warning Considerable damage threat	PSR	4 hr
Mar 12, 8:22 PM PDT	Areal Flood Warning	PSR	3 hr
Mar 18, 1:26 AM PDT	Wind Advisory	PSR	28 hr
Mar 22, 9:10 PM PDT	Wind Advisory	PSR	20 hr
Mar 26, 1:20 AM PDT	Wind Advisory	PSR	29 hr
Apr 2, 1:16 PM PDT	Wind Advisory	PSR	9 hr
Apr 6, 1:22 PM PDT	Flash Flood Watch	PSR	53 hr
Apr 8, 8:21 AM PDT	Areal Flood Advisory	PSR	3 hr
Apr 8, 9:23 AM PDT	Flash Flood Warning Considerable damage threat	PSR	4 hr
Apr 8, 2:48 PM PDT	Special Weather Statement	PSR	27 min
Apr 8, 3:15 PM PDT	Special Weather Statement	PSR	30 min
Apr 10, 9:41 PM PDT	Areal Flood Advisory	PSR	3 hr
Apr 12, 1:59 PM PDT	Wind Advisory	PSR	18 hr
Apr 17, 1:40 PM PDT	Wind Advisory	PSR	10 hr
Apr 20, 2:16 AM PDT	Wind Advisory	PSR	27 hr
Apr 24, 1:32 PM PDT	Excessive Heat Warning	PSR	71 hr
Apr 25, 1:37 PM PDT	Excessive Heat Watch	PSR	38 hr
Apr 27, 3:44 AM PDT	Excessive Heat Warning	PSR	4 days
May 4, 1:55 PM PDT	Excessive Heat Watch	PSR	13 hr
May 5, 2:36 AM PDT	Excessive Heat Warning	PSR	65 hr
May 11, 1:28 PM PDT	Wind Advisory	PSR	43 hr
May 17, 1:26 PM PDT	Wind Advisory	PSR	44 hr
May 18, 1:47 PM PDT	Wind Advisory	PSR	33 hr
May 21, 1:56 PM PDT	Wind Advisory	PSR	42 hr
May 22, 3:32 AM PDT	Excessive Heat Watch	PSR	47 hr
May 24, 2:55 AM PDT	Excessive Heat Warning	PSR	8 days
May 29, 3:18 AM PDT	Wind Advisory	PSR	29 hr
Jun 1, 2:36 AM PDT	Excessive Heat Watch	PSR	23 hr
Jun 2, 2:04 AM PDT	Excessive Heat Warning	PSR	66 hr
Jun 4, 2:33 PM PDT	Wind Advisory	PSR	62 hr
Jun 5, 4:33 PM PDT	Special Weather Statement	PSR	27 min
Jun 13, 2:06 PM PDT	Wind Advisory	PSR	10 hr
Jun 27, 2:04 PM PDT	Wind Advisory	PSR	41 hr
Jun 29, 7:07 AM PDT	Wind Advisory	PSR	4 hr
Jul 6, 2:31 PM PDT	Excessive Heat Watch	PSR	48 hr
Jul 8, 2:19 PM PDT	Excessive Heat Warning	PSR	5 days
Jul 27, 1:17 AM PDT	Excessive Heat Watch	PSR	26 hr
Jul 28, 2:57 AM PDT	Excessive Heat Warning	PSR	8 days
Aug 2, 1:52 AM PDT	Excessive Heat Warning	PSR	66 hr
Aug 10, 2:20 AM PDT	Excessive Heat Watch	PSR	35 hr
Aug 11, 1:27 PM PDT	Excessive Heat Warning	PSR	9 days
Aug 16, 9:29 PM PDT	Dust Storm Advisory	PSR	61 min
Aug 16, 10:17 PM PDT	Dust Storm Advisory	PSR	58 min
Aug 17, 11:44 PM PDT	Dust Storm Advisory	PSR	61 min
Aug 18, 3:26 AM PDT	Special Weather Statement	PSR	34 min
Aug 21, 3:20 AM PDT	Excessive Heat Watch	PSR	47 hr
Aug 23, 2:25 AM PDT	Excessive Heat Warning	PSR	6 days
Aug 28, 1:48 AM PDT	Excessive Heat Warning	PSR	18 hr
Aug 29, 4:02 PM PDT	Special Weather Statement	PSR	58 min
Sep 1, 2:23 AM PDT	Excessive Heat Watch	PSR	35 hr
Sep 2, 1:33 PM PDT	Excessive Heat Warning	PSR	5 days
Sep 6, 2:44 PM PDT	Red Flag Warning	PSR	57 hr
Sep 6, 2:44 PM PDT	Wind Advisory	PSR	55 hr
Sep 8, 11:58 AM PDT	Blowing Dust Advisory	PSR	4 hr
Sep 9, 10:15 AM PDT	Red Flag Warning	PSR	7 hr
Sep 15, 1:57 PM PDT	Excessive Heat Warning	PSR	54 hr
Sep 21, 4:35 PM PDT	Dust Storm Advisory	PSR	55 min
Oct 22, 5:51 AM PDT	Dense Fog Advisory	PSR	3 hr
Oct 24, 1:59 PM PDT	Wind Advisory	PSR	55 hr
Oct 24, 2:03 PM PDT	Fire Weather Watch	PSR	24 hr
Oct 25, 9:33 AM PDT	Blowing Dust Advisory	PSR	7 hr
Oct 25, 2:17 PM PDT	Red Flag Warning	PSR	31 hr
Oct 26, 4:02 AM PDT	Blowing Dust Advisory	PSR	13 hr
Oct 26, 4:30 AM PDT	Dust Storm Advisory	PSR	90 min
Oct 26, 10:05 AM PDT	Wind Advisory	PSR	7 hr
Oct 26, 9:07 PM PDT	Red Flag Warning	PSR	17 hr
Nov 6, 1:22 AM PST	Wind Advisory	PSR	66 hr
Nov 7, 8:55 AM PST	Blowing Dust Advisory	PSR	8 hr
Dec 2, 1:01 AM PST	Freeze Watch	PSR	24 hr
Dec 3, 12:44 AM PST	Freeze Warning	PSR	30 hr
Dec 3, 12:21 PM PST	Freeze Warning	PSR	43 hr
Dec 12, 11:38 AM PST	Wind Advisory	PSR	5 hr
Dec 27, 1:13 PM PST	Wind Advisory	PSR	28 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	1
Mesoscale Discussion	1
Special Weather Statement	8
Flooding
Areal Flood Warning	2
Flash Flood Warning	7
Flash Flood Watch	2
Areal Flood Advisory	7
Heat
Excessive Heat Warning	13
Excessive Heat Watch	9
Cold
Freeze Warning	2
Freeze Watch	1
Wind and dust
High Wind Warning	1
Blowing Dust Advisory	4
Dust Storm Advisory	5
Wind Advisory	30
Fire
Red Flag Warning	4
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	4

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2019 2021

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.