Alert archive / New York / Nassau County

Weather alerts in Nassau County, New York, 2015

168 weather alerts in 2015, 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 2015. Tap one for its archive.

Alerts: 168
Warnings: 18
Watches: 17
Advisories: 73
Busiest month: July23 alerts
Busiest day: July 1, 20156 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, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	6	4	33%	10	30%	35 min
Flash flood warnings	3	3	0%	10	100%	69 min

Each office's whole area, 2015

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS New York, NY: severe thunderstorm warnings	34	23	32%	130	75%	18 min
NWS New York, NY: flash flood warnings	20	15	25%	52	92%	66 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 6, 3:57 PM EST	Wind Chill Advisory	OKX	41 hr
Jan 11, 3:20 AM EST	Winter Weather Advisory	OKX	36 hr
Jan 17, 3:30 PM EST	Freezing Rain Advisory	OKX	25 hr
Jan 18, 12:35 PM EST	Areal Flood Advisory	OKX	115 min
Jan 18, 2:05 PM EST	Areal Flood Warning	OKX	4 hr
Jan 18, 3:24 PM EST	Special Weather Statement	OKX	81 min
Jan 18, 3:51 PM EST	Areal Flood Advisory	OKX	114 min
Jan 23, 4:11 AM EST	Winter Weather Advisory	OKX	39 hr
Jan 23, 11:48 PM EST	Mesoscale Discussion	SPC	6 hr
Jan 25, 3:56 AM EST	Blizzard Watch	OKX	11 hr
Jan 25, 3:19 PM EST	Blizzard Warning	OKX	45 hr
Jan 25, 3:29 PM EST	Coastal Flood Watch	OKX	22 hr
Jan 26, 1:33 PM EST	Coastal Flood Warning	OKX	16 hr
Jan 26, 1:33 PM EST	Coastal Flood Advisory	OKX	17 hr
Jan 26, 11:32 PM EST	Mesoscale Discussion	SPC	4 hr
Jan 27, 1:55 AM EST	Winter Storm Warning	OKX	20 hr
Jan 27, 4:28 AM EST	Mesoscale Discussion	SPC	5 hr
Jan 27, 4:56 AM EST	Coastal Flood Statement	OKX	13 hr
Jan 27, 9:11 AM EST	Winter Weather Advisory	OKX	7 hr
Jan 30, 4:06 AM EST	Wind Advisory	OKX	30 hr
Jan 31, 3:34 AM EST	Winter Storm Watch	OKX	36 hr
Jan 31, 3:50 PM EST	Winter Storm Warning	OKX	47 hr
Feb 1, 4:01 PM EST	Winter Weather Advisory	OKX	41 hr
Feb 2, 7:41 AM EST	Areal Flood Advisory	OKX	2 hr
Feb 2, 10:04 AM EST	Areal Flood Advisory	OKX	3 hr
Feb 8, 4:12 AM EST	Winter Weather Advisory	OKX	44 hr
Feb 13, 4:00 AM EST	High Wind Watch	OKX	25 hr
Feb 13, 3:43 PM EST	Winter Weather Advisory	OKX	48 hr
Feb 14, 4:33 AM EST	Wind Advisory	OKX	37 hr
Feb 14, 3:38 PM EST	High Wind Warning	OKX	24 hr
Feb 14, 3:51 PM EST	Wind Chill Advisory	OKX	41 hr
Feb 16, 3:50 PM EST	Winter Weather Advisory	OKX	22 hr
Feb 19, 3:49 AM EST	Wind Chill Advisory	OKX	30 hr
Feb 20, 4:20 PM EST	Winter Weather Advisory	OKX	43 hr
Feb 28, 3:13 PM EST	Winter Weather Advisory	OKX	33 hr
Mar 1, 1:57 PM EST	Mesoscale Discussion	SPC	5 hr
Mar 2, 4:11 PM EST	Winter Weather Advisory	OKX	36 hr
Mar 3, 3:46 PM EST	Winter Storm Watch	OKX	24 hr
Mar 3, 7:01 PM EST	Mesoscale Discussion	SPC	4 hr
Mar 4, 4:23 AM EST	Winter Storm Warning	OKX	35 hr
Mar 4, 3:49 PM EST	Winter Weather Advisory	OKX	27 hr
Mar 10, 6:09 PM EDT	Dense Fog Advisory	OKX	13 hr
Mar 19, 4:18 AM EDT	Winter Weather Advisory	OKX	55 hr
Mar 26, 6:20 AM EDT	Special Weather Statement	OKX	3 hr
Mar 26, 3:49 PM EDT	Dense Fog Advisory	OKX	6 hr
Apr 2, 3:25 AM EDT	Wind Advisory	OKX	16 hr
Apr 3, 3:17 PM EDT	Dense Fog Advisory	OKX	15 hr
Apr 19, 3:37 PM EDT	Coastal Flood Statement	OKX	22 hr
Apr 20, 2:14 PM EDT	Dense Fog Advisory	OKX	14 hr
Apr 20, 9:48 PM EDT	Coastal Flood Statement	OKX	4 hr
Apr 22, 3:57 PM EDT	Severe Thunderstorm Warning	OKX	22 min
Apr 22, 4:14 PM EDT	Areal Flood Advisory	OKX	2 hr
Apr 22, 4:36 PM EDT	Special Weather Statement	OKX	54 min
May 8, 6:36 AM EDT	Dense Fog Advisory	OKX	3 hr
May 8, 3:20 PM EDT	Dense Fog Advisory	OKX	14 hr
May 9, 3:28 PM EDT	Dense Fog Advisory	OKX	18 hr
May 10, 3:32 PM EDT	Dense Fog Advisory	OKX	12 hr
May 11, 3:25 PM EDT	Dense Fog Advisory	OKX	18 hr
May 28, 11:54 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 28, 4:26 PM EDT	Mesoscale Discussion	SPC	64 min
May 28, 6:55 PM EDT	Special Weather Statement	OKX	35 min
May 29, 5:50 PM EDT	Rip Current Statement	OKX	27 hr
May 31, 1:01 PM EDT	Flash Flood Watch	OKX	43 hr
May 31, 6:30 PM EDT	Areal Flood Advisory	OKX	3 hr
May 31, 7:12 PM EDT	Special Weather Statement	OKX	48 min
Jun 7, 4:52 PM EDT	Rip Current Statement	OKX	52 hr
Jun 14, 10:05 PM EDT	Areal Flood Advisory	OKX	115 min
Jun 16, 5:34 PM EDT	Areal Flood Advisory	OKX	116 min
Jun 19, 4:14 PM EDT	Flood Watch	OKX	38 hr
Jun 21, 6:10 PM EDT	Special Weather Statement	OKX	35 min
Jun 21, 6:48 PM EDT	Special Weather Statement	OKX	27 min
Jun 23, 10:12 AM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 23, 3:35 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 23, 5:58 PM EDT	Severe Thunderstorm Warning	OKX	47 min
Jun 23, 6:48 PM EDT	Severe Thunderstorm Warning	OKX	12 min
Jun 23, 8:34 PM EDT	Mesoscale Discussion	SPC	56 min
Jun 27, 4:28 AM EDT	Rip Current Statement	OKX	64 hr
Jul 1, 3:17 AM EDT	Flash Flood Watch	OKX	3 hr
Jul 1, 4:13 AM EDT	Severe Thunderstorm Warning	OKX	47 min
Jul 1, 4:34 AM EDT	Severe Thunderstorm Warning	OKX	41 min
Jul 1, 4:54 AM EDT	Mesoscale Discussion	SPC	66 min
Jul 1, 4:57 AM EDT	Special Weather Statement	OKX	48 min
Jul 1, 7:59 AM EDT	Rip Current Statement	OKX	13 hr
Jul 8, 6:00 PM EDT	Areal Flood Advisory	OKX	2 hr
Jul 14, 2:23 AM EDT	Areal Flood Advisory	OKX	52 min
Jul 14, 4:11 PM EDT	Coastal Flood Statement	OKX	8 hr
Jul 15, 12:17 PM EDT	Areal Flood Advisory	OKX	118 min
Jul 15, 1:03 PM EDT	Areal Flood Advisory	OKX	117 min
Jul 20, 4:48 PM EDT	Special Weather Statement	OKX	27 min
Jul 20, 5:24 PM EDT	Special Weather Statement	OKX	36 min
Jul 20, 8:48 PM EDT	Special Weather Statement	OKX	42 min
Jul 21, 7:00 PM EDT	Mesoscale Discussion	SPC	90 min
Jul 25, 4:45 PM EDT	Rip Current Statement	OKX	28 hr
Jul 29, 4:39 PM EDT	Rip Current Statement	OKX	27 hr
Jul 30, 2:50 PM EDT	Severe Thunderstorm Warning	OKX	40 min
Jul 30, 3:08 PM EDT	Areal Flood Advisory	OKX	112 min
Jul 30, 3:35 PM EDT	Special Weather Statement	OKX	40 min
Jul 30, 4:21 PM EDT	Special Weather Statement	OKX	39 min
Jul 30, 4:40 PM EDT	Areal Flood Advisory	OKX	2 hr
Jul 30, 5:04 PM EDT	Special Weather Statement	OKX	41 min
Aug 1, 12:40 PM EDT	Rip Current Statement	OKX	8 hr
Aug 2, 4:06 PM EDT	Rip Current Statement	OKX	29 hr
Aug 3, 4:46 PM EDT	Rip Current Statement	OKX	28 hr
Aug 4, 3:29 AM EDT	Mesoscale Discussion	SPC	3 hr
Aug 4, 3:38 AM EDT	Special Weather Statement	OKX	52 min
Aug 4, 4:28 AM EDT	Special Weather Statement	OKX	62 min
Aug 10, 12:56 PM EDT	Flash Flood Watch	OKX	22 hr
Aug 10, 4:35 PM EDT	Rip Current Statement	OKX	27 hr
Aug 11, 7:28 AM EDT	Special Weather Statement	OKX	62 min
Aug 11, 7:57 AM EDT	Areal Flood Advisory	OKX	2 hr
Aug 11, 9:10 AM EDT	Areal Flood Advisory	OKX	2 hr
Aug 16, 2:33 PM EDT	Special Weather Statement	OKX	42 min
Aug 16, 3:09 PM EDT	Areal Flood Advisory	OKX	66 min
Aug 16, 3:18 PM EDT	Special Weather Statement	OKX	42 min
Aug 19, 3:14 PM EDT	Rip Current Statement	OKX	30 hr
Aug 21, 4:58 AM EDT	Areal Flood Advisory	OKX	3 hr
Aug 21, 5:16 AM EDT	Flash Flood Warning	OKX	119 min
Sep 3, 4:56 PM EDT	Rip Current Statement	OKX	28 hr
Sep 10, 4:05 AM EDT	Areal Flood Advisory	OKX	115 min
Sep 10, 9:50 AM EDT	Areal Flood Advisory	OKX	3 hr
Sep 10, 11:05 AM EDT	Flash Flood Warning	OKX	3 hr
Sep 10, 2:25 PM EDT	Flash Flood Watch	OKX	11 hr
Sep 10, 5:10 PM EDT	Flash Flood Warning	OKX	3 hr
Sep 12, 5:27 PM EDT	Special Weather Statement	OKX	48 min
Sep 12, 6:26 PM EDT	Special Weather Statement	OKX	64 min
Sep 21, 3:26 PM EDT	Rip Current Statement	OKX	35 hr
Sep 23, 3:23 PM EDT	Rip Current Statement	OKX	13 hr
Sep 24, 3:24 PM EDT	Rip Current Statement	OKX	51 hr
Sep 26, 3:40 AM EDT	Coastal Flood Statement	OKX	54 hr
Sep 26, 3:40 AM EDT	Coastal Flood Advisory	OKX	17 hr
Sep 26, 8:55 PM EDT	Coastal Flood Advisory	OKX	24 hr
Sep 27, 4:55 AM EDT	Rip Current Statement	OKX	15 hr
Sep 30, 3:44 AM EDT	Coastal Flood Statement	OKX	11 hr
Sep 30, 4:09 PM EDT	Coastal Flood Watch	OKX	37 hr
Sep 30, 4:09 PM EDT	Coastal Flood Advisory	OKX	26 hr
Sep 30, 4:09 PM EDT	High Surf Advisory	OKX	5 days
Oct 1, 12:34 AM EDT	Coastal Flood Advisory	OKX	17 hr
Oct 1, 5:57 PM EDT	Coastal Flood Watch	OKX	11 hr
Oct 1, 5:57 PM EDT	Coastal Flood Advisory	OKX	24 hr
Oct 2, 4:34 PM EDT	Coastal Flood Advisory	OKX	11 hr
Oct 2, 4:34 PM EDT	Coastal Flood Advisory	OKX	24 hr
Oct 3, 4:44 AM EDT	Coastal Flood Warning	OKX	8 hr
Oct 3, 3:58 PM EDT	Coastal Flood Advisory	OKX	26 hr
Oct 3, 3:58 PM EDT	Coastal Flood Advisory	OKX	14 hr
Oct 5, 4:35 AM EDT	Coastal Flood Statement	OKX	8 hr
Oct 9, 3:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Oct 9, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	4 hr
Oct 9, 5:34 PM EDT	Special Weather Statement	OKX	56 min
Oct 9, 6:04 PM EDT	Areal Flood Advisory	OKX	56 min
Oct 16, 3:05 PM EDT	Freeze Watch	OKX	37 hr
Oct 18, 3:41 AM EDT	Freeze Warning	OKX	30 hr
Oct 27, 3:54 PM EDT	Coastal Flood Advisory	OKX	22 hr
Oct 28, 7:28 AM EDT	Coastal Flood Statement	OKX	19 hr
Oct 28, 7:28 AM EDT	Coastal Flood Advisory	OKX	16 hr
Oct 29, 2:39 AM EDT	Coastal Flood Statement	OKX	9 hr
Nov 5, 3:13 AM EST	Dense Fog Advisory	OKX	6 hr
Nov 11, 4:22 PM EST	Coastal Flood Advisory	OKX	17 hr
Nov 12, 9:51 AM EST	Coastal Flood Statement	OKX	69 min
Nov 12, 9:51 AM EST	Coastal Flood Advisory	OKX	2 hr
Nov 27, 12:53 AM EST	Dense Fog Advisory	OKX	8 hr
Dec 11, 2:14 AM EST	Dense Fog Advisory	OKX	8 hr
Dec 14, 8:45 AM EST	Dense Fog Advisory	OKX	3 hr
Dec 14, 2:35 PM EST	Dense Fog Advisory	OKX	10 hr
Dec 23, 1:09 AM EST	Dense Fog Advisory	OKX	8 hr
Dec 24, 6:44 PM EST	Dense Fog Advisory	OKX	11 hr
Dec 27, 3:47 AM EST	Dense Fog Advisory	OKX	6 hr
Dec 29, 4:07 AM EST	Coastal Flood Statement	OKX	11 hr
Dec 29, 4:07 AM EST	Coastal Flood Advisory	OKX	8 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	6
Severe Thunderstorm Watch	4
Mesoscale Discussion	11
Special Weather Statement	22
Flooding
Areal Flood Warning	1
Flash Flood Warning	3
Flash Flood Watch	4
Flood Watch	1
Areal Flood Advisory	21
Winter
Blizzard Warning	1
Winter Storm Warning	3
Blizzard Watch	1
Winter Storm Watch	2
Freezing Rain Advisory	1
Winter Weather Advisory	12
Cold
Freeze Warning	1
Freeze Watch	1
Wind Chill Advisory	3
Wind and dust
High Wind Warning	1
High Wind Watch	1
Wind Advisory	3
Fog and smoke
Dense Fog Advisory	17
Coast and beach
Coastal Flood Warning	2
Coastal Flood Watch	3
Coastal Flood Advisory	15
High Surf Advisory	1
Coastal Flood Statement	11
Rip Current Statement	16

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2014 2016

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.