Alert archive / Hawaii / Honolulu County

Weather alerts in Honolulu County, Hawaii, 2020

121 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Honolulu County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts: 121
Warnings: 20
Watches: 9
Advisories: 91
Busiest month: March29 alerts
Busiest day: March 28, 20206 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Honolulu County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	0			0
Flash flood warnings	8	2	75%	3	67%	28 min

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Honolulu, HI: tornado warnings	2	0	100%	0
NWS Honolulu, HI: severe thunderstorm warnings	7	0	100%	0
NWS Honolulu, HI: flash flood warnings	25	7	72%	23	83%	215 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, Hawaii-Aleutian Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 1, 3:30 AM HST	High Surf Advisory	HFO	24 hr
Jan 5, 9:17 AM HST	Wind Advisory	HFO	6 days
Jan 5, 7:09 PM HST	High Surf Advisory	HFO	3 days
Jan 7, 3:43 PM HST	Flash Flood Watch	HFO	6 days
Jan 9, 3:43 AM HST	High Surf Warning	HFO	60 hr
Jan 10, 3:44 AM HST	Severe Thunderstorm Watch	SPC	67 days
Jan 10, 11:02 PM HST	Areal Flood Advisory	HFO	9 hr
Jan 11, 3:29 PM HST	High Surf Advisory	HFO	5 days
Jan 11, 6:30 PM HST	Areal Flood Advisory	HFO	3 hr
Jan 17, 3:26 PM HST	High Surf Advisory	HFO	12 hr
Jan 19, 3:01 PM HST	High Surf Advisory	HFO	25 hr
Jan 21, 3:47 PM HST	High Surf Warning	HFO	47 hr
Jan 23, 2:58 PM HST	High Surf Advisory	HFO	13 hr
Jan 24, 4:05 PM HST	High Surf Warning	HFO	47 hr
Jan 25, 4:16 AM HST	High Surf Advisory	HFO	71 hr
Jan 28, 3:33 PM HST	High Surf Advisory	HFO	4 days
Feb 5, 3:17 PM HST	High Surf Advisory	HFO	4 days
Feb 5, 8:05 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 6, 7:20 AM HST	Areal Flood Advisory	HFO	6 hr
Feb 6, 11:03 AM HST	Areal Flood Advisory	HFO	3 hr
Feb 9, 3:25 AM HST	Wind Advisory	HFO	36 hr
Feb 9, 3:35 PM HST	High Surf Warning	HFO	42 hr
Feb 10, 5:56 AM HST	Areal Flood Advisory	HFO	11 hr
Feb 11, 9:27 AM HST	High Surf Advisory	HFO	18 hr
Feb 12, 3:44 PM HST	High Surf Advisory	HFO	36 hr
Feb 18, 3:44 AM HST	Wind Advisory	HFO	72 hr
Feb 19, 3:21 AM HST	High Surf Advisory	HFO	60 hr
Feb 24, 3:32 PM HST	High Surf Advisory	HFO	48 hr
Feb 25, 3:45 PM HST	High Surf Warning	HFO	12 hr
Feb 27, 3:12 PM HST	High Surf Advisory	HFO	6 days
Feb 28, 6:31 PM HST	Wind Advisory	HFO	57 hr
Mar 2, 6:23 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 3, 1:29 AM HST	Areal Flood Advisory	HFO	3 hr
Mar 4, 2:32 PM HST	Areal Flood Advisory	HFO	67 min
Mar 5, 3:37 PM HST	High Surf Advisory	HFO	3 days
Mar 6, 2:20 PM HST	Wind Advisory	HFO	54 hr
Mar 11, 3:17 PM HST	High Surf Advisory	HFO	60 hr
Mar 13, 3:34 PM HST	Flash Flood Watch	HFO	6 days
Mar 15, 12:08 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 15, 1:17 PM HST	Flash Flood Warning	HFO	3 hr
Mar 16, 10:40 AM HST	Areal Flood Advisory	HFO	100 min
Mar 16, 2:54 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 17, 8:59 AM HST	Areal Flood Advisory	HFO	3 hr
Mar 17, 10:08 AM HST	Flash Flood Warning	HFO	3 hr
Mar 17, 10:20 AM HST	Special Weather Statement	HFO	25 min
Mar 18, 3:12 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 18, 3:58 PM HST	Flash Flood Warning	HFO	2 hr
Mar 20, 3:30 PM HST	High Surf Advisory	HFO	12 hr
Mar 22, 3:17 PM HST	Wind Advisory	HFO	4 days
Mar 23, 3:31 PM HST	High Surf Advisory	HFO	6 days
Mar 24, 4:59 PM HST	Tsunami Watch	HEB	54 min
Mar 27, 3:23 PM HST	Flash Flood Watch	HFO	48 hr
Mar 27, 6:50 PM HST	Areal Flood Advisory	HFO	6 hr
Mar 27, 11:49 PM HST	Flash Flood Warning	HFO	3 hr
Mar 28, 2:23 AM HST	Flash Flood Warning	HFO	3 hr
Mar 28, 3:44 AM HST	Flash Flood Warning	HFO	2 hr
Mar 28, 9:13 AM HST	Areal Flood Advisory	HFO	3 hr
Mar 28, 4:13 PM HST	Areal Flood Advisory	HFO	94 min
Mar 29, 10:09 AM HST	Areal Flood Advisory	HFO	3 hr
Mar 29, 10:20 AM HST	Flash Flood Warning	HFO	102 min
Mar 31, 2:32 PM HST	Areal Flood Advisory	HFO	2 hr
Apr 1, 1:38 PM HST	Areal Flood Advisory	HFO	93 min
Apr 5, 6:03 PM HST	Areal Flood Advisory	HFO	2 hr
Apr 10, 3:22 AM HST	High Surf Advisory	HFO	12 hr
Apr 13, 10:29 AM HST	Areal Flood Advisory	HFO	3 hr
Apr 13, 10:48 AM HST	Flash Flood Warning	HFO	4 hr
Apr 14, 3:00 AM HST	Flash Flood Watch	HFO	24 hr
Apr 14, 3:10 AM HST	Areal Flood Advisory	HFO	5 hr
Apr 14, 3:31 PM HST	High Surf Advisory	HFO	24 hr
Apr 15, 3:27 PM HST	High Surf Warning	HFO	12 hr
Apr 15, 3:27 PM HST	High Surf Advisory	HFO	24 hr
Apr 18, 3:22 AM HST	High Surf Advisory	HFO	48 hr
Apr 21, 4:39 PM HST	High Surf Advisory	HFO	71 hr
May 13, 1:58 PM HST	Areal Flood Advisory	HFO	3 hr
May 14, 12:57 PM HST	Areal Flood Advisory	HFO	3 hr
May 15, 4:00 AM HST	High Surf Advisory	HFO	47 hr
May 17, 8:19 PM HST	High Surf Advisory	HFO	31 hr
Jun 2, 3:33 AM HST	High Surf Advisory	HFO	3 days
Jun 27, 3:19 PM HST	High Surf Advisory	HFO	60 hr
Jul 24, 5:44 AM HST	Hurricane Watch	HFO	47 hr
Jul 24, 11:28 AM HST	Flash Flood Watch	HFO	3 days
Jul 24, 3:50 PM HST	High Surf Warning	HFO	61 hr
Jul 24, 11:13 PM HST	Hurricane Warning	HFO	59 hr
Jul 26, 4:40 AM HST	High Surf Advisory	HFO	24 hr
Jul 27, 4:24 AM HST	High Surf Advisory	HFO	11 hr
Oct 2, 2:12 PM HST	Areal Flood Advisory	HFO	2 hr
Oct 2, 5:33 PM HST	Areal Flood Advisory	HFO	102 min
Oct 14, 5:26 PM HST	Areal Flood Advisory	HFO	2 hr
Oct 19, 4:38 PM HST	Tsunami Advisory	HEB	21 days
Oct 20, 6:59 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 21, 12:48 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 21, 6:18 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 22, 11:02 AM HST	Areal Flood Advisory	HFO	61 min
Oct 23, 4:19 AM HST	Areal Flood Advisory	HFO	2 hr
Oct 23, 12:13 PM HST	Areal Flood Advisory	HFO	107 min
Oct 23, 5:08 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 24, 3:53 AM HST	Areal Flood Advisory	HFO	3 hr
Oct 24, 8:06 PM HST	High Surf Advisory	HFO	31 hr
Oct 25, 2:16 PM HST	Areal Flood Advisory	HFO	2 hr
Oct 26, 3:42 AM HST	Flash Flood Watch	HFO	60 hr
Oct 26, 3:40 PM HST	Areal Flood Advisory	HFO	53 min
Oct 26, 4:47 PM HST	Areal Flood Advisory	HFO	115 min
Oct 27, 8:12 PM HST	Areal Flood Advisory	HFO	55 min
Oct 28, 1:13 PM HST	Areal Flood Advisory	HFO	2 hr
Nov 9, 3:17 PM HST	High Surf Advisory	HFO	4 days
Nov 15, 11:15 AM HST	Areal Flood Advisory	HFO	2 hr
Nov 21, 3:27 PM HST	High Surf Advisory	HFO	72 hr
Nov 24, 12:02 AM HST	Areal Flood Advisory	HFO	5 hr
Nov 24, 4:59 PM HST	Areal Flood Advisory	HFO	71 min
Nov 30, 3:28 PM HST	High Surf Warning	HFO	69 hr
Dec 3, 12:48 PM HST	High Surf Advisory	HFO	15 hr
Dec 5, 3:30 PM HST	High Surf Warning	HFO	40 hr
Dec 7, 7:31 AM HST	High Surf Advisory	HFO	44 hr
Dec 16, 3:30 PM HST	High Surf Advisory	HFO	44 hr
Dec 18, 11:38 AM HST	High Surf Advisory	HFO	28 hr
Dec 22, 4:02 PM HST	High Surf Advisory	HFO	59 hr
Dec 26, 1:50 PM HST	Wind Advisory	HFO	12 hr
Dec 26, 3:23 PM HST	High Surf Advisory	HFO	36 hr
Dec 28, 3:33 AM HST	High Surf Warning	HFO	36 hr
Dec 28, 3:33 AM HST	High Surf Advisory	HFO	53 hr
Dec 30, 6:26 AM HST	High Surf Warning	HFO	69 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 Watch	1
Special Weather Statement	1
Flooding
Flash Flood Warning	8
Flash Flood Watch	6
Areal Flood Advisory	44
Wind and dust
Wind Advisory	7
Tropical
Hurricane Warning	1
Hurricane Watch	1
Coast and beach
High Surf Warning	11
Tsunami Watch	1
High Surf Advisory	39
Tsunami Advisory	1

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.