Weather alerts in Hawaii County, Hawaii, 2021

159 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Hawaii County and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts: 159
Warnings: 13
Watches: 16
Advisories: 122
Busiest month: December34 alerts
Busiest day: December 6, 20219 alerts

Over time

By month

Warning verification

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

Hawaii County, 2021

	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	7	3	57%	10	40%	143 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Honolulu, HI: severe thunderstorm warnings	0			3	0%
NWS Honolulu, HI: flash flood warnings	50	22	56%	71	72%	201 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 9, 8:17 PM HST	Areal Flood Advisory	HFO	82 min
Jan 16, 5:23 AM HST	High Surf Advisory	HFO	4 days
Jan 17, 3:04 AM HST	Flash Flood Watch	HFO	3 days
Jan 17, 7:07 PM HST	Areal Flood Advisory	HFO	3 hr
Jan 18, 3:49 AM HST	Winter Weather Advisory	HFO	36 hr
Jan 18, 8:53 AM HST	Areal Flood Advisory	HFO	3 hr
Jan 18, 3:41 PM HST	Areal Flood Advisory	HFO	3 hr
Jan 20, 5:23 PM HST	Areal Flood Advisory	HFO	92 min
Jan 22, 3:33 PM HST	Wind Advisory	HFO	36 hr
Jan 22, 4:19 PM HST	High Surf Advisory	HFO	7 days
Jan 24, 3:09 AM HST	Winter Storm Watch	HFO	12 hr
Jan 24, 8:46 AM HST	Flash Flood Watch	HFO	55 hr
Jan 24, 3:23 PM HST	Winter Weather Advisory	HFO	12 hr
Jan 25, 2:09 AM HST	Areal Flood Advisory	HFO	3 hr
Jan 25, 3:06 AM HST	Winter Storm Warning	HFO	36 hr
Jan 25, 4:24 AM HST	Areal Flood Advisory	HFO	3 hr
Jan 25, 7:26 AM HST	Areal Flood Advisory	HFO	6 hr
Jan 25, 10:47 AM HST	Flash Flood Warning	HFO	6 hr
Jan 26, 12:39 AM HST	Areal Flood Advisory	HFO	3 hr
Jan 26, 3:30 AM HST	Flash Flood Warning	HFO	2 hr
Jan 26, 5:33 AM HST	Areal Flood Advisory	HFO	3 hr
Jan 28, 3:13 AM HST	Wind Advisory	HFO	12 hr
Feb 3, 1:44 AM HST	Wind Advisory	HFO	19 hr
Feb 3, 7:16 AM HST	Winter Weather Advisory	HFO	27 hr
Feb 4, 3:31 AM HST	High Surf Advisory	HFO	59 hr
Feb 4, 4:55 PM HST	Areal Flood Advisory	HFO	42 min
Feb 5, 2:22 PM HST	Special Weather Statement	HFO	53 min
Feb 5, 2:39 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 6, 3:41 AM HST	Wind Advisory	HFO	9 hr
Feb 8, 3:18 PM HST	Winter Weather Advisory	HFO	24 hr
Feb 9, 7:23 AM HST	Areal Flood Advisory	HFO	5 hr
Feb 9, 2:58 PM HST	Special Weather Statement	HFO	62 min
Feb 9, 4:05 PM HST	Special Weather Statement	HFO	55 min
Feb 10, 3:31 AM HST	Tsunami Watch	HEB	169 days
Feb 12, 3:18 AM HST	Wind Advisory	HFO	25 hr
Feb 13, 3:58 AM HST	High Wind Warning	HFO	12 hr
Feb 13, 4:06 AM HST	High Surf Advisory	HFO	3 days
Feb 13, 3:33 PM HST	Wind Advisory	HFO	12 hr
Feb 13, 9:00 PM HST	Winter Weather Advisory	HFO	13 hr
Feb 18, 8:57 AM HST	Winter Weather Advisory	HFO	6 hr
Feb 18, 12:36 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 18, 2:54 PM HST	Special Weather Statement	HFO	36 min
Feb 24, 8:49 AM HST	Wind Advisory	HFO	55 hr
Feb 26, 7:09 AM HST	Winter Weather Advisory	HFO	3 days
Feb 26, 8:27 AM HST	Flash Flood Watch	HFO	67 hr
Feb 26, 1:11 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 26, 2:29 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 27, 7:19 AM HST	Areal Flood Advisory	HFO	6 hr
Feb 27, 1:06 PM HST	Areal Flood Advisory	HFO	12 hr
Feb 28, 3:15 AM HST	Wind Advisory	HFO	65 hr
Feb 28, 4:25 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 28, 8:38 PM HST	Areal Flood Advisory	HFO	6 hr
Mar 7, 11:20 AM HST	Flash Flood Watch	HFO	8 days
Mar 7, 11:31 AM HST	Winter Storm Watch	HFO	4 hr
Mar 7, 3:20 PM HST	Winter Weather Advisory	HFO	4 days
Mar 7, 5:22 PM HST	Areal Flood Advisory	HFO	6 hr
Mar 8, 1:09 PM HST	Areal Flood Advisory	HFO	12 hr
Mar 9, 10:55 AM HST	Areal Flood Advisory	HFO	11 hr
Mar 10, 1:02 AM HST	Areal Flood Advisory	HFO	4 hr
Mar 10, 5:26 AM HST	Flash Flood Warning	HFO	3 hr
Mar 10, 6:36 AM HST	Flash Flood Warning	HFO	3 hr
Mar 10, 9:06 AM HST	Areal Flood Advisory	HFO	115 min
Mar 10, 4:30 PM HST	Areal Flood Advisory	HFO	2 hr
Mar 11, 6:09 PM HST	Areal Flood Advisory	HFO	99 min
Mar 12, 3:12 PM HST	Winter Weather Advisory	HFO	48 hr
Mar 13, 4:43 AM HST	Areal Flood Advisory	HFO	6 hr
Mar 13, 6:03 AM HST	Special Weather Statement	HFO	87 min
Mar 13, 10:31 AM HST	Areal Flood Advisory	HFO	7 hr
Mar 14, 2:21 PM HST	Areal Flood Advisory	HFO	114 min
Mar 14, 6:16 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 15, 5:13 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 16, 4:30 PM HST	Areal Flood Advisory	HFO	53 min
Mar 17, 6:57 PM HST	Areal Flood Advisory	HFO	97 min
Mar 19, 3:28 PM HST	Wind Advisory	HFO	53 hr
Mar 20, 4:44 PM HST	Areal Flood Advisory	HFO	5 hr
Mar 22, 5:08 PM HST	Areal Flood Advisory	HFO	111 min
Mar 23, 1:39 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 28, 5:15 PM HST	Wind Advisory	HFO	22 hr
Mar 28, 7:06 PM HST	Winter Weather Advisory	HFO	32 hr
Apr 5, 3:23 PM HST	High Surf Advisory	HFO	3 days
Apr 11, 1:20 PM HST	Winter Weather Advisory	HFO	11 hr
Apr 12, 1:06 PM HST	Areal Flood Advisory	HFO	3 hr
Apr 28, 6:35 PM HST	Areal Flood Advisory	HFO	75 min
May 3, 8:54 PM HST	Areal Flood Advisory	HFO	87 min
May 5, 9:17 AM HST	Flash Flood Watch	HFO	54 hr
May 6, 3:22 AM HST	Winter Storm Watch	HFO	12 hr
May 6, 3:26 PM HST	Winter Weather Advisory	HFO	12 hr
May 24, 3:09 PM HST	Coastal Flood Statement	HFO	4 days
Jun 19, 7:56 PM HST	Areal Flood Advisory	HFO	3 hr
Jun 20, 4:34 PM HST	High Surf Advisory	HFO	23 hr
Jun 26, 6:50 PM HST	Areal Flood Advisory	HFO	3 hr
Jul 4, 3:22 PM HST	High Surf Advisory	HFO	3 days
Jul 8, 7:38 PM HST	Areal Flood Advisory	HFO	3 hr
Jul 19, 3:04 AM HST	Wind Advisory	HFO	17 hr
Jul 31, 8:30 PM HST	Wind Advisory	HFO	21 hr
Aug 11, 4:55 PM HST	Areal Flood Advisory	HFO	3 hr
Aug 16, 3:30 PM HST	High Surf Advisory	HFO	60 hr
Aug 16, 3:58 PM HST	Areal Flood Advisory	HFO	3 hr
Aug 17, 4:06 PM HST	Areal Flood Advisory	HFO	52 min
Aug 20, 2:39 PM HST	Flash Flood Watch	HFO	4 days
Aug 21, 4:01 PM HST	High Surf Advisory	HFO	59 hr
Aug 22, 1:48 PM HST	Wind Advisory	HFO	37 hr
Aug 23, 12:51 PM HST	Areal Flood Advisory	HFO	7 hr
Sep 2, 7:19 PM HST	Areal Flood Advisory	HFO	88 min
Sep 3, 3:11 AM HST	Wind Advisory	HFO	17 hr
Sep 5, 2:25 PM HST	Areal Flood Advisory	HFO	3 hr
Sep 15, 8:43 PM HST	Areal Flood Advisory	HFO	3 hr
Sep 15, 11:25 PM HST	Areal Flood Advisory	HFO	2 hr
Sep 27, 5:57 PM HST	Areal Flood Advisory	HFO	2 hr
Oct 7, 3:33 PM HST	Wind Advisory	HFO	3 days
Oct 8, 3:30 PM HST	High Surf Advisory	HFO	3 days
Oct 11, 7:19 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 11, 11:16 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 12, 2:09 AM HST	Areal Flood Advisory	HFO	6 hr
Oct 12, 2:26 AM HST	Flash Flood Warning	HFO	6 hr
Nov 13, 8:38 PM HST	Areal Flood Advisory	HFO	105 min
Nov 14, 3:42 AM HST	Flood Watch	HFO	23 hr
Nov 16, 2:31 PM HST	Areal Flood Advisory	HFO	91 min
Nov 16, 8:00 PM HST	Areal Flood Advisory	HFO	85 min
Nov 17, 2:00 PM HST	Areal Flood Advisory	HFO	3 hr
Nov 17, 5:25 PM HST	Areal Flood Advisory	HFO	5 hr
Nov 28, 3:52 AM HST	High Wind Watch	HFO	10 hr
Nov 28, 1:53 PM HST	High Wind Warning	HFO	26 hr
Nov 28, 1:53 PM HST	Wind Advisory	HFO	26 hr
Nov 29, 1:01 PM HST	Areal Flood Advisory	HFO	3 hr
Dec 2, 3:34 AM HST	High Wind Watch	HFO	12 hr
Dec 2, 3:35 AM HST	Winter Storm Watch	HFO	12 hr
Dec 2, 3:04 PM HST	Flood Watch	HFO	5 days
Dec 2, 3:26 PM HST	Blizzard Warning	HFO	3 days
Dec 2, 3:26 PM HST	High Wind Warning	HFO	3 days
Dec 2, 4:02 PM HST	Areal Flood Advisory	HFO	3 hr
Dec 3, 9:08 AM HST	High Surf Warning	HFO	66 hr
Dec 3, 9:08 AM HST	High Surf Advisory	HFO	66 hr
Dec 3, 6:09 PM HST	Areal Flood Advisory	HFO	3 hr
Dec 3, 9:06 PM HST	Areal Flood Advisory	HFO	92 min
Dec 3, 10:59 PM HST	Areal Flood Advisory	HFO	2 hr
Dec 4, 3:09 PM HST	Wind Advisory	HFO	55 hr
Dec 5, 4:33 AM HST	Areal Flood Advisory	HFO	111 min
Dec 5, 9:30 AM HST	Areal Flood Advisory	HFO	6 hr
Dec 5, 2:30 PM HST	Areal Flood Advisory	HFO	86 min
Dec 5, 3:35 PM HST	Coastal Flood Statement	HFO	42 hr
Dec 5, 3:56 PM HST	Flash Flood Warning	HFO	5 hr
Dec 6, 12:37 AM HST	Areal Flood Advisory	HFO	11 hr
Dec 6, 3:24 AM HST	Winter Weather Advisory	HFO	12 hr
Dec 6, 3:37 AM HST	High Surf Advisory	HFO	12 hr
Dec 6, 7:39 AM HST	Special Weather Statement	HFO	51 min
Dec 6, 11:30 AM HST	Flash Flood Warning	HFO	2 hr
Dec 6, 1:43 PM HST	Areal Flood Advisory	HFO	3 hr
Dec 17, 7:15 PM HST	Areal Flood Advisory	HFO	3 hr
Dec 19, 12:53 AM HST	Winter Weather Advisory	HFO	10 hr
Dec 20, 3:00 PM HST	Areal Flood Advisory	HFO	98 min
Dec 20, 3:08 PM HST	High Surf Advisory	HFO	5 days
Dec 21, 12:34 PM HST	Flood Watch	HFO	26 hr
Dec 21, 1:22 PM HST	Areal Flood Advisory	HFO	4 hr
Dec 21, 3:16 PM HST	Winter Weather Advisory	HFO	24 hr
Dec 22, 3:05 AM HST	Areal Flood Advisory	HFO	11 hr
Dec 30, 3:07 PM HST	Winter Weather Advisory	HFO	19 hr
Dec 30, 3:42 PM HST	Areal Flood Advisory	HFO	3 hr
Dec 31, 9:11 AM HST	Areal Flood Advisory	HFO	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
Special Weather Statement	6
Flooding
Flash Flood Warning	7
Flash Flood Watch	6
Flood Watch	3
Areal Flood Advisory	76
Winter
Blizzard Warning	1
Winter Storm Warning	1
Winter Storm Watch	4
Winter Weather Advisory	16
Wind and dust
High Wind Warning	3
High Wind Watch	2
Wind Advisory	17
Coast and beach
High Surf Warning	1
Tsunami Watch	1
High Surf Advisory	13
Coastal Flood Statement	2

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2020 2022

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.