Alert archive / New York / Nassau County

Weather alerts in Nassau County, New York, 2016

202 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Nassau County and its neighbors

Each county as a circle sized by its count in 2016. Tap one for its archive.

Alerts: 202
Warnings: 28
Watches: 18
Advisories: 61
Busiest month: February28 alerts
Busiest day: January 23, 20167 alerts

Over time

By month

Warning verification

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

Nassau County, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	9	7	22%	15	60%	21 min
Flash flood warnings	1	1	0%	2	100%	80 min

Each office's whole area, 2016

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS New York, NY: tornado warnings	1	1	0%	1	100%	4 min
NWS New York, NY: severe thunderstorm warnings	64	37	42%	127	61%	23 min
NWS New York, NY: flash flood warnings	15	9	40%	49	82%	52 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, Eastern Time. Each opens its own page with the text, the map, the radar and the sounding.

Issued	Product	Office	Lasted
Jan 9, 12:38 PM EST	Coastal Flood Advisory	OKX	25 hr
Jan 10, 3:25 AM EST	Coastal Flood Warning	OKX	9 hr
Jan 10, 11:16 AM EST	Special Weather Statement	OKX	14 min
Jan 10, 12:11 PM EST	Special Weather Statement	OKX	49 min
Jan 10, 3:32 PM EST	Special Weather Statement	OKX	58 min
Jan 10, 4:22 PM EST	Special Weather Statement	OKX	68 min
Jan 12, 3:48 PM EST	Wind Advisory	OKX	18 hr
Jan 21, 3:42 AM EST	Blizzard Watch	OKX	25 hr
Jan 21, 4:11 PM EST	Coastal Flood Watch	OKX	24 hr
Jan 22, 4:18 AM EST	Blizzard Warning	OKX	48 hr
Jan 22, 4:31 AM EST	Coastal Flood Warning	OKX	33 hr
Jan 22, 4:31 AM EST	Coastal Flood Warning	OKX	43 hr
Jan 22, 4:31 AM EST	Coastal Flood Advisory	OKX	33 hr
Jan 22, 4:31 AM EST	Coastal Flood Advisory	OKX	44 hr
Jan 22, 4:31 AM EST	High Surf Advisory	OKX	61 hr
Jan 23, 12:08 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 23, 4:20 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 23, 8:36 AM EST	Special Weather Statement	OKX	3 hr
Jan 23, 8:51 AM EST	Mesoscale Discussion	SPC	4 hr
Jan 23, 12:00 PM EST	Special Weather Statement	OKX	60 min
Jan 23, 12:44 PM EST	Mesoscale Discussion	SPC	6 hr
Jan 23, 6:40 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 23, 11:26 PM EST	Coastal Flood Statement	OKX	14 hr
Jan 23, 11:26 PM EST	Coastal Flood Advisory	OKX	13 hr
Jan 24, 3:41 PM EST	Coastal Flood Advisory	OKX	8 hr
Feb 4, 4:06 PM EST	Winter Weather Advisory	OKX	20 hr
Feb 4, 8:56 PM EST	Winter Storm Warning	OKX	18 hr
Feb 5, 7:44 AM EST	Mesoscale Discussion	SPC	6 hr
Feb 7, 2:22 PM EST	Winter Weather Advisory	OKX	28 hr
Feb 7, 4:36 PM EST	Coastal Flood Advisory	OKX	20 hr
Feb 7, 4:36 PM EST	Coastal Flood Advisory	OKX	32 hr
Feb 7, 4:36 PM EST	High Surf Advisory	OKX	44 hr
Feb 8, 9:26 AM EST	Coastal Flood Warning	OKX	4 hr
Feb 8, 1:47 PM EST	Coastal Flood Warning	OKX	9 hr
Feb 8, 5:05 PM EST	Coastal Flood Warning	OKX	18 hr
Feb 8, 5:05 PM EST	Coastal Flood Advisory	OKX	20 hr
Feb 9, 4:32 AM EST	Winter Weather Advisory	OKX	17 hr
Feb 9, 5:02 AM EST	Coastal Flood Advisory	OKX	21 hr
Feb 9, 3:09 PM EST	Coastal Flood Advisory	OKX	22 hr
Feb 9, 6:28 PM EST	Winter Weather Advisory	OKX	3 hr
Feb 12, 4:04 AM EST	Wind Chill Advisory	OKX	56 hr
Feb 14, 3:45 PM EST	Winter Weather Advisory	OKX	39 hr
Feb 15, 3:17 AM EST	Coastal Flood Statement	OKX	13 hr
Feb 15, 4:04 PM EST	Coastal Flood Advisory	OKX	24 hr
Feb 16, 2:47 PM EST	Severe Thunderstorm Warning	OKX	28 min
Feb 23, 10:49 AM EST	Coastal Flood Statement	OKX	13 hr
Feb 24, 3:50 AM EST	Wind Advisory	OKX	24 hr
Feb 24, 6:06 AM EST	Coastal Flood Statement	OKX	16 hr
Feb 24, 6:46 PM EST	Mesoscale Discussion	SPC	119 min
Feb 24, 7:44 PM EST	Severe Thunderstorm Watch	SPC	8 hr
Feb 24, 10:39 PM EST	Mesoscale Discussion	SPC	66 min
Feb 24, 11:26 PM EST	Severe Thunderstorm Warning	OKX	64 min
Feb 24, 11:32 PM EST	Areal Flood Advisory	OKX	3 hr
Mar 14, 1:12 PM EDT	Coastal Flood Advisory	OKX	17 hr
Mar 14, 1:17 PM EDT	Coastal Flood Advisory	OKX	14 hr
Mar 17, 1:27 PM EDT	Special Weather Statement	OKX	63 min
Mar 17, 6:12 PM EDT	Special Weather Statement	OKX	48 min
Mar 19, 3:10 PM EDT	Winter Weather Advisory	OKX	42 hr
Mar 28, 3:19 AM EDT	Wind Advisory	OKX	32 hr
Apr 1, 4:00 AM EDT	High Wind Watch	OKX	25 hr
Apr 2, 4:34 AM EDT	High Wind Warning	OKX	33 hr
Apr 2, 4:03 PM EDT	Freeze Watch	OKX	12 hr
Apr 3, 12:39 AM EDT	Special Weather Statement	OKX	66 min
Apr 3, 4:22 AM EDT	Freeze Warning	OKX	26 hr
Apr 3, 5:44 AM EDT	Special Weather Statement	OKX	31 min
Apr 3, 5:51 PM EDT	Freeze Warning	OKX	40 hr
Apr 4, 3:55 PM EDT	Freeze Warning	OKX	41 hr
Apr 7, 3:54 AM EDT	Wind Advisory	OKX	16 hr
Apr 7, 3:22 PM EDT	Coastal Flood Statement	OKX	7 hr
Apr 8, 3:55 AM EDT	Freeze Watch	OKX	25 hr
Apr 9, 4:30 AM EDT	Freeze Warning	OKX	29 hr
Apr 9, 2:43 PM EDT	Coastal Flood Statement	OKX	13 hr
Apr 26, 3:21 AM EDT	Special Weather Statement	OKX	39 min
Apr 26, 4:03 AM EDT	Special Weather Statement	OKX	57 min
May 4, 4:10 AM EDT	Coastal Flood Statement	OKX	20 hr
May 4, 4:10 AM EDT	Coastal Flood Advisory	OKX	20 hr
May 4, 3:18 PM EDT	Special Weather Statement	OKX	42 min
May 4, 8:51 PM EDT	Coastal Flood Advisory	OKX	27 hr
May 5, 4:43 PM EDT	Coastal Flood Watch	OKX	11 hr
May 5, 10:46 PM EDT	Coastal Flood Advisory	OKX	27 hr
May 6, 3:47 AM EDT	Coastal Flood Warning	OKX	19 hr
May 6, 4:58 PM EDT	Coastal Flood Advisory	OKX	34 hr
May 7, 3:31 AM EDT	Coastal Flood Statement	OKX	23 hr
May 8, 2:59 AM EDT	Coastal Flood Statement	OKX	23 hr
May 14, 6:08 PM EDT	Special Weather Statement	OKX	52 min
May 15, 7:16 PM EDT	Special Weather Statement	OKX	29 min
May 30, 4:27 AM EDT	Areal Flood Advisory	OKX	3 hr
Jun 3, 3:23 PM EDT	Coastal Flood Statement	OKX	6 hr
Jun 4, 4:04 AM EDT	Coastal Flood Advisory	OKX	18 hr
Jun 5, 4:07 AM EDT	Coastal Flood Advisory	OKX	19 hr
Jun 5, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 5, 6:50 PM EDT	Special Weather Statement	OKX	40 min
Jun 6, 3:49 AM EDT	Coastal Flood Statement	OKX	19 hr
Jun 7, 3:36 AM EDT	Coastal Flood Statement	OKX	20 hr
Jun 7, 4:08 PM EDT	Special Weather Statement	OKX	37 min
Jun 11, 6:37 PM EDT	Special Weather Statement	OKX	38 min
Jun 21, 5:59 PM EDT	Rip Current Statement	OKX	27 hr
Jul 1, 1:32 PM EDT	Tornado Watch	SPC	8 hr
Jul 1, 5:21 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 1, 6:38 PM EDT	Special Weather Statement	OKX	37 min
Jul 1, 7:49 PM EDT	Special Weather Statement	OKX	26 min
Jul 1, 9:10 PM EDT	Severe Thunderstorm Warning	OKX	29 min
Jul 1, 10:05 PM EDT	Special Weather Statement	OKX	55 min
Jul 7, 4:00 AM EDT	Flash Flood Watch	OKX	14 hr
Jul 7, 6:32 PM EDT	Special Weather Statement	OKX	43 min
Jul 7, 7:11 PM EDT	Special Weather Statement	OKX	49 min
Jul 14, 4:12 PM EDT	Severe Thunderstorm Warning	OKX	63 min
Jul 18, 5:19 AM EDT	Rip Current Statement	OKX	16 hr
Jul 18, 12:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 18, 3:21 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 18, 5:22 PM EDT	Special Weather Statement	OKX	23 min
Jul 18, 6:49 PM EDT	Mesoscale Discussion	SPC	86 min
Jul 21, 4:42 PM EDT	Rip Current Statement	OKX	28 hr
Jul 24, 3:27 AM EDT	Heat Advisory	OKX	39 hr
Jul 25, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 25, 3:03 PM EDT	Mesoscale Discussion	SPC	57 min
Jul 25, 3:45 PM EDT	Special Weather Statement	OKX	60 min
Jul 25, 4:27 PM EDT	Severe Thunderstorm Warning	OKX	33 min
Jul 25, 4:52 PM EDT	Mesoscale Discussion	SPC	83 min
Jul 25, 4:58 PM EDT	Flash Flood Warning	OKX	3 hr
Jul 25, 5:09 PM EDT	Special Weather Statement	OKX	36 min
Jul 28, 2:32 PM EDT	Flash Flood Watch	OKX	17 hr
Jul 29, 5:08 AM EDT	Areal Flood Advisory	OKX	52 min
Jul 29, 9:06 AM EDT	Areal Flood Advisory	OKX	114 min
Jul 31, 4:56 AM EDT	Flash Flood Watch	OKX	10 hr
Jul 31, 9:50 PM EDT	Areal Flood Advisory	OKX	115 min
Aug 6, 2:19 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 6, 4:56 PM EDT	Special Weather Statement	OKX	49 min
Aug 9, 3:45 PM EDT	Heat Advisory	OKX	5 days
Aug 9, 10:08 PM EDT	Rip Current Statement	OKX	71 hr
Aug 10, 6:11 PM EDT	Areal Flood Advisory	OKX	2 hr
Aug 11, 2:27 PM EDT	Excessive Heat Watch	OKX	24 hr
Aug 11, 3:33 PM EDT	Special Weather Statement	OKX	42 min
Aug 11, 6:17 PM EDT	Special Weather Statement	OKX	43 min
Aug 11, 6:37 PM EDT	Severe Thunderstorm Warning	OKX	38 min
Aug 11, 6:39 PM EDT	Areal Flood Advisory	OKX	2 hr
Aug 12, 4:15 AM EDT	Excessive Heat Warning	OKX	65 hr
Aug 12, 6:57 PM EDT	Severe Thunderstorm Warning	OKX	48 min
Aug 12, 7:25 PM EDT	Severe Thunderstorm Warning	OKX	37 min
Aug 13, 8:53 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 14, 1:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 14, 7:44 PM EDT	Special Weather Statement	OKX	46 min
Aug 16, 7:28 PM EDT	Special Weather Statement	OKX	47 min
Aug 19, 3:06 PM EDT	Areal Flood Advisory	OKX	114 min
Aug 20, 12:52 PM EDT	Areal Flood Advisory	OKX	113 min
Aug 25, 4:12 AM EDT	Rip Current Statement	OKX	17 hr
Aug 28, 4:29 PM EDT	Rip Current Statement	OKX	3 days
Aug 30, 5:00 PM EDT	Tropical Storm Watch	NHC	5 days
Aug 31, 5:00 AM EDT	Tropical Storm Warning	NHC	10 days
Sep 1, 3:46 PM EDT	Areal Flood Advisory	OKX	119 min
Sep 2, 11:41 AM EDT	Tropical Storm Watch	OKX	24 hr
Sep 3, 4:14 AM EDT	Tropical Storm Warning	OKX	3 days
Sep 4, 11:05 PM EDT	Coastal Flood Statement	OKX	18 hr
Sep 4, 11:05 PM EDT	Coastal Flood Advisory	OKX	16 hr
Sep 5, 5:10 AM EDT	Coastal Flood Advisory	OKX	22 hr
Sep 5, 3:28 PM EDT	Coastal Flood Statement	OKX	13 hr
Sep 5, 3:28 PM EDT	Coastal Flood Statement	OKX	24 hr
Sep 5, 3:28 PM EDT	Coastal Flood Advisory	OKX	24 hr
Sep 5, 7:40 PM EDT	Rip Current Statement	OKX	23 hr
Sep 6, 7:05 PM EDT	Rip Current Statement	OKX	22 hr
Sep 10, 3:49 AM EDT	Rip Current Statement	OKX	13 hr
Sep 11, 3:16 AM EDT	Rip Current Statement	OKX	13 hr
Sep 14, 5:29 PM EDT	Special Weather Statement	OKX	46 min
Sep 14, 5:36 PM EDT	Severe Thunderstorm Warning	OKX	54 min
Sep 19, 9:45 AM EDT	Areal Flood Advisory	OKX	105 min
Sep 24, 4:18 AM EDT	Rip Current Statement	OKX	23 hr
Sep 28, 3:24 PM EDT	Coastal Flood Advisory	OKX	19 hr
Sep 28, 3:24 PM EDT	Coastal Flood Advisory	OKX	32 hr
Sep 29, 5:19 AM EDT	Rip Current Statement	OKX	10 hr
Sep 29, 3:17 PM EDT	Coastal Flood Advisory	OKX	20 hr
Sep 30, 4:25 AM EDT	Coastal Flood Advisory	OKX	20 hr
Oct 1, 4:50 AM EDT	Coastal Flood Statement	OKX	5 hr
Oct 13, 6:05 AM EDT	Dense Fog Advisory	OKX	3 hr
Oct 15, 7:58 PM EDT	Coastal Flood Statement	OKX	14 hr
Oct 16, 3:31 PM EDT	Coastal Flood Statement	OKX	19 hr
Oct 16, 6:18 PM EDT	Coastal Flood Statement	OKX	4 hr
Oct 17, 3:37 PM EDT	Coastal Flood Statement	OKX	21 hr
Oct 19, 3:46 AM EDT	Coastal Flood Statement	OKX	10 hr
Oct 19, 3:28 PM EDT	Coastal Flood Statement	OKX	25 hr
Oct 21, 5:15 AM EDT	Coastal Flood Statement	OKX	12 hr
Oct 21, 1:55 PM EDT	Areal Flood Advisory	OKX	2 hr
Oct 22, 4:10 AM EDT	Wind Advisory	OKX	19 hr
Oct 30, 4:26 PM EDT	Special Weather Statement	OKX	49 min
Oct 30, 5:43 PM EDT	Special Weather Statement	OKX	47 min
Nov 14, 3:15 PM EST	Coastal Flood Advisory	OKX	19 hr
Nov 14, 3:15 PM EST	Coastal Flood Advisory	OKX	21 hr
Nov 15, 10:05 AM EST	Special Weather Statement	OKX	115 min
Nov 15, 1:34 PM EST	Coastal Flood Statement	OKX	21 hr
Nov 19, 5:23 AM EST	Coastal Flood Statement	OKX	8 hr
Nov 19, 3:25 PM EST	Wind Advisory	OKX	52 hr
Nov 19, 11:48 PM EST	Special Weather Statement	OKX	87 min
Dec 10, 6:47 PM EST	Special Weather Statement	OKX	43 min
Dec 14, 3:20 PM EST	High Wind Watch	OKX	13 hr
Dec 14, 3:20 PM EST	Wind Advisory	OKX	24 hr
Dec 15, 3:52 AM EST	High Wind Warning	OKX	24 hr
Dec 15, 10:28 AM EST	Special Weather Statement	OKX	32 min
Dec 16, 4:20 AM EST	Winter Weather Advisory	OKX	35 hr
Dec 17, 5:05 AM EST	Special Weather Statement	OKX	55 min
Dec 17, 7:19 AM EST	Special Weather Statement	OKX	86 min
Dec 17, 8:07 AM EST	Special Weather Statement	OKX	83 min
Dec 18, 1:11 AM EST	Dense Fog Advisory	OKX	7 hr
Dec 18, 2:59 PM EST	Special Weather Statement	OKX	61 min

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	9
Severe Thunderstorm Watch	4
Tornado Watch	1
Mesoscale Discussion	16
Special Weather Statement	42
Flooding
Flash Flood Warning	1
Flash Flood Watch	3
Areal Flood Advisory	12
Winter
Blizzard Warning	1
Winter Storm Warning	1
Blizzard Watch	1
Winter Weather Advisory	7
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	2
Cold
Freeze Warning	4
Freeze Watch	2
Wind Chill Advisory	1
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	7
Fog and smoke
Dense Fog Advisory	2
Tropical
Tropical Storm Warning	2
Tropical Storm Watch	2
Coast and beach
Coastal Flood Warning	7
Coastal Flood Watch	2
Coastal Flood Advisory	28
High Surf Advisory	2
Coastal Flood Statement	25
Rip Current Statement	12

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2015 2017

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.