Alert archive / Hawaii / Honolulu County

Weather alerts in Honolulu County, Hawaii, 2009

117 weather alerts in 2009, 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 2009. Tap one for its archive.

Alerts: 117
Warnings: 19
Watches: 12
Advisories: 86
Busiest month: February17 alerts
Busiest day: October 5, 20097 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, 2009

	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	9	1	89%	3	100%	81 min

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Honolulu, HI: tornado warnings	0			1	0%
NWS Honolulu, HI: severe thunderstorm warnings	2	0	100%	1	0%
NWS Honolulu, HI: flash flood warnings	29	4	86%	8	100%	144 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
Dec 31, 4:39 PM HST	Areal Flood Advisory	HFO	2 hr
Jan 1, 1:24 AM HST	Areal Flood Advisory	HFO	3 hr
Jan 2, 3:28 PM HST	High Surf Advisory	HFO	4 days
Jan 10, 3:35 PM HST	High Surf Advisory	HFO	60 hr
Jan 11, 2:49 AM HST	Areal Flood Advisory	HFO	64 min
Jan 13, 10:15 AM HST	High Surf Warning	HFO	5 days
Jan 14, 3:55 PM HST	High Wind Watch	HFO	24 hr
Jan 14, 8:04 PM HST	High Wind Warning	HFO	4 days
Jan 18, 3:34 AM HST	High Surf Advisory	HFO	36 hr
Jan 20, 3:18 AM HST	High Surf Advisory	HFO	60 hr
Jan 23, 8:09 AM HST	High Surf Advisory	HFO	43 hr
Jan 26, 9:59 PM HST	Areal Flood Advisory	HFO	3 hr
Jan 28, 3:32 PM HST	High Surf Advisory	HFO	41 hr
Feb 3, 3:35 AM HST	High Surf Advisory	HFO	30 hr
Feb 5, 3:18 PM HST	High Surf Advisory	HFO	45 hr
Feb 7, 1:14 PM HST	Areal Flood Advisory	HFO	3 hr
Feb 9, 9:40 PM HST	Areal Flood Advisory	HFO	6 hr
Feb 10, 1:54 PM HST	Areal Flood Advisory	HFO	58 min
Feb 10, 2:48 PM HST	Areal Flood Advisory	HFO	47 min
Feb 11, 7:42 AM HST	High Surf Advisory	HFO	7 hr
Feb 11, 1:05 PM HST	Areal Flood Advisory	HFO	115 min
Feb 11, 1:27 PM HST	Flash Flood Warning	HFO	40 min
Feb 11, 3:09 PM HST	High Wind Watch	HFO	36 hr
Feb 11, 4:59 PM HST	Areal Flood Advisory	HFO	48 min
Feb 12, 7:07 AM HST	Areal Flood Advisory	HFO	3 hr
Feb 12, 9:29 AM HST	Areal Flood Advisory	HFO	3 hr
Feb 13, 3:35 AM HST	Wind Advisory	HFO	48 hr
Feb 13, 3:52 PM HST	High Surf Advisory	HFO	4 days
Feb 19, 3:52 PM HST	High Surf Advisory	HFO	14 days
Feb 27, 12:01 PM HST	Wind Advisory	HFO	5 days
Mar 9, 7:22 AM HST	High Surf Advisory	HFO	32 hr
Mar 9, 7:15 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 9, 8:00 PM HST	Flash Flood Warning	HFO	3 hr
Mar 12, 3:36 PM HST	High Surf Advisory	HFO	65 hr
Mar 13, 3:26 PM HST	High Surf Warning	HFO	24 hr
Mar 14, 6:05 AM HST	Areal Flood Advisory	HFO	3 hr
Mar 14, 7:35 AM HST	Flash Flood Warning	HFO	2 hr
Mar 14, 10:11 AM HST	Areal Flood Advisory	HFO	94 min
Mar 15, 3:19 AM HST	Areal Flood Advisory	HFO	3 hr
Mar 17, 9:54 PM HST	Areal Flood Advisory	HFO	3 hr
Mar 17, 10:20 PM HST	Flash Flood Warning	HFO	3 hr
Mar 23, 3:04 PM HST	High Surf Advisory	HFO	5 days
Mar 31, 3:18 AM HST	High Surf Advisory	HFO	60 hr
Apr 6, 3:29 AM HST	High Surf Advisory	HFO	45 hr
Apr 10, 3:19 PM HST	Areal Flood Advisory	HFO	3 hr
Apr 20, 12:35 PM HST	Areal Flood Advisory	HFO	3 hr
Apr 20, 9:55 PM HST	Areal Flood Advisory	HFO	3 hr
Apr 22, 3:40 AM HST	Flash Flood Watch	HFO	60 hr
Jun 7, 3:30 PM HST	High Surf Advisory	HFO	4 days
Jun 13, 2:59 PM HST	High Surf Advisory	HFO	5 days
Jun 24, 6:30 AM HST	High Surf Advisory	HFO	4 days
Jun 30, 3:31 PM HST	High Surf Advisory	HFO	72 hr
Jul 21, 3:35 PM HST	High Surf Advisory	HFO	72 hr
Jul 25, 3:34 PM HST	High Surf Advisory	HFO	48 hr
Jul 30, 3:33 PM HST	High Surf Advisory	HFO	4 days
Aug 8, 3:34 PM HST	Flash Flood Watch	HFO	71 hr
Aug 8, 5:23 PM HST	Tropical Storm Watch	HFO	66 hr
Aug 9, 9:30 AM HST	High Surf Warning	HFO	50 hr
Aug 9, 4:45 PM HST	High Surf Advisory	HFO	22 hr
Aug 9, 5:00 PM HST	Tropical Storm Watch	HFO	6 days
Aug 9, 11:00 PM HST	Tropical Storm Watch	HFO	7 days
Aug 11, 11:48 AM HST	High Surf Advisory	HFO	16 hr
Aug 12, 2:11 AM HST	Areal Flood Advisory	HFO	97 min
Aug 12, 9:52 AM HST	Flash Flood Watch	HFO	30 hr
Aug 12, 11:42 PM HST	Areal Flood Advisory	HFO	3 hr
Aug 13, 12:24 AM HST	Flash Flood Warning	HFO	3 hr
Aug 13, 12:58 PM HST	Areal Flood Advisory	HFO	3 hr
Aug 17, 3:31 PM HST	High Surf Advisory	HFO	48 hr
Aug 18, 8:46 AM HST	Flash Flood Watch	HFO	31 hr
Sep 10, 9:07 AM HST	High Surf Advisory	HFO	54 hr
Sep 24, 9:21 AM HST	High Surf Advisory	HFO	50 hr
Oct 4, 7:34 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 4, 9:03 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 4, 9:41 PM HST	Flash Flood Warning	HFO	3 hr
Oct 5, 1:27 AM HST	Areal Flood Advisory	HFO	2 hr
Oct 5, 3:37 AM HST	Flash Flood Watch	HFO	36 hr
Oct 5, 12:14 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 5, 1:24 PM HST	Areal Flood Advisory	HFO	71 min
Oct 5, 6:02 PM HST	Areal Flood Advisory	HFO	108 min
Oct 9, 2:49 PM HST	Areal Flood Advisory	HFO	3 hr
Oct 9, 4:14 PM HST	Areal Flood Advisory	HFO	74 min
Oct 16, 2:59 PM HST	High Surf Advisory	HFO	60 hr
Oct 25, 2:10 PM HST	Areal Flood Advisory	HFO	107 min
Oct 25, 3:42 PM HST	Areal Flood Advisory	HFO	87 min
Oct 28, 3:12 PM HST	High Surf Advisory	HFO	36 hr
Oct 30, 3:21 PM HST	High Surf Advisory	HFO	72 hr
Nov 9, 3:38 PM HST	Flash Flood Watch	HFO	5 days
Nov 10, 7:47 PM HST	Areal Flood Advisory	HFO	2 hr
Nov 11, 10:52 AM HST	High Surf Advisory	HFO	8 days
Nov 11, 3:37 PM HST	High Surf Warning	HFO	72 hr
Nov 13, 1:51 AM HST	Areal Flood Advisory	HFO	3 hr
Nov 13, 3:16 AM HST	Flash Flood Warning	HFO	5 hr
Nov 13, 10:00 PM HST	Areal Flood Advisory	HFO	8 hr
Nov 14, 2:37 AM HST	Flash Flood Warning	HFO	3 hr
Nov 14, 5:20 AM HST	Flash Flood Warning	HFO	115 min
Nov 14, 7:21 AM HST	Areal Flood Advisory	HFO	5 hr
Nov 17, 10:57 AM HST	Wind Advisory	HFO	33 hr
Nov 21, 3:29 PM HST	High Surf Advisory	HFO	52 hr
Nov 24, 3:30 PM HST	High Surf Warning	HFO	41 hr
Nov 26, 8:33 AM HST	High Surf Advisory	HFO	67 hr
Nov 29, 3:35 PM HST	High Surf Advisory	HFO	36 hr
Dec 2, 3:26 AM HST	High Surf Advisory	HFO	48 hr
Dec 3, 7:04 AM HST	High Surf Warning	HFO	8 hr
Dec 3, 6:35 PM HST	Areal Flood Advisory	HFO	2 hr
Dec 4, 4:03 PM HST	High Surf Warning	HFO	5 days
Dec 4, 4:03 PM HST	High Surf Advisory	HFO	48 hr
Dec 8, 3:17 PM HST	High Surf Advisory	HFO	24 hr
Dec 9, 3:17 PM HST	High Surf Advisory	HFO	24 hr
Dec 18, 3:13 PM HST	High Surf Advisory	HFO	60 hr
Dec 19, 11:30 PM HST	Flash Flood Watch	HFO	16 hr
Dec 21, 3:25 AM HST	High Surf Advisory	HFO	24 hr
Dec 22, 3:29 AM HST	High Surf Warning	HFO	24 hr
Dec 23, 3:35 AM HST	High Surf Advisory	HFO	32 hr
Dec 23, 3:32 PM HST	High Surf Warning	HFO	65 hr
Dec 26, 8:46 AM HST	High Surf Advisory	HFO	19 hr
Dec 27, 3:34 PM HST	High Surf Advisory	HFO	41 hr
Dec 30, 3:26 PM HST	High Surf Advisory	HFO	51 hr

By product

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

Product	Alerts
Flooding
Flash Flood Warning	9
Flash Flood Watch	7
Areal Flood Advisory	38
Wind and dust
High Wind Warning	1
High Wind Watch	2
Wind Advisory	3
Tropical
Tropical Storm Watch	3
Coast and beach
High Surf Warning	9
High Surf Advisory	45

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2008 2010

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.