Alert archive / New York / Westchester County

Weather alerts in Westchester County, New York, 2021

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

Westchester County and its neighbors

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

Alerts: 225
Warnings: 57
Watches: 26
Advisories: 72
Busiest month: July60 alerts
Busiest day: September 2, 202115 alerts

Over time

By month

Warning verification

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

0 of 5 tornado warnings covering Westchester County in 2021 had a tornado report inside them.

Westchester County, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	5	0	100%	0
Severe thunderstorm warnings	24	18	25%	9	89%	35 min
Flash flood warnings	12	12	0%	35	83%	115 min

Each office's whole area, 2021

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS New York, NY: tornado warnings	16	5	69%	13	62%	8 min
NWS New York, NY: severe thunderstorm warnings	88	56	36%	193	69%	24 min
NWS New York, NY: flash flood warnings	50	45	10%	249	91%	125 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 2, 3:46 PM EST	Winter Weather Advisory	OKX	36 hr
Jan 15, 4:08 PM EST	Coastal Flood Statement	OKX	11 hr
Jan 15, 4:08 PM EST	Coastal Flood Statement	OKX	23 hr
Jan 25, 3:16 PM EST	Winter Weather Advisory	OKX	36 hr
Jan 29, 6:06 AM EST	Wind Advisory	OKX	12 hr
Jan 30, 3:40 AM EST	Winter Storm Watch	OKX	36 hr
Jan 31, 3:44 AM EST	Winter Storm Warning	OKX	48 hr
Jan 31, 4:01 AM EST	Coastal Flood Advisory	OKX	37 hr
Jan 31, 4:01 AM EST	Coastal Flood Advisory	OKX	48 hr
Feb 1, 7:13 AM EST	Mesoscale Discussion	SPC	6 hr
Feb 1, 1:43 PM EST	Mesoscale Discussion	SPC	6 hr
Feb 1, 7:27 PM EST	Mesoscale Discussion	SPC	6 hr
Feb 2, 7:15 AM EST	Coastal Flood Advisory	OKX	10 hr
Feb 2, 7:15 AM EST	Coastal Flood Advisory	OKX	23 hr
Feb 5, 3:29 PM EST	Winter Storm Watch	OKX	13 hr
Feb 6, 4:00 AM EST	Winter Storm Warning	OKX	39 hr
Feb 6, 4:00 AM EST	Winter Weather Advisory	OKX	38 hr
Feb 8, 3:28 PM EST	Winter Weather Advisory	OKX	28 hr
Feb 10, 3:30 PM EST	Winter Weather Advisory	OKX	18 hr
Feb 13, 3:18 AM EST	Winter Weather Advisory	OKX	31 hr
Feb 14, 3:32 PM EST	Winter Weather Advisory	OKX	37 hr
Feb 16, 7:19 AM EST	Areal Flood Advisory	OKX	2 hr
Feb 16, 3:42 PM EST	Winter Storm Watch	OKX	24 hr
Feb 17, 3:55 PM EST	Winter Weather Advisory	OKX	51 hr
Feb 18, 9:47 AM EST	Mesoscale Discussion	SPC	4 hr
Feb 18, 12:51 PM EST	Special Weather Statement	OKX	114 min
Feb 22, 3:05 AM EST	Winter Weather Advisory	OKX	13 hr
Feb 28, 3:38 PM EST	Wind Advisory	OKX	47 hr
Mar 12, 4:23 AM EST	Wind Advisory	OKX	26 hr
Mar 13, 3:31 PM EST	Wind Advisory	OKX	29 hr
Mar 25, 3:42 PM EDT	Wind Advisory	OKX	32 hr
Mar 28, 3:54 AM EDT	Wind Advisory	OKX	34 hr
Mar 28, 7:26 PM EDT	Special Weather Statement	OKX	49 min
Apr 11, 2:40 AM EDT	Dense Fog Advisory	OKX	7 hr
Apr 21, 3:41 AM EDT	Freeze Warning	OKX	29 hr
Apr 21, 11:49 AM EDT	Mesoscale Discussion	SPC	2 hr
Apr 21, 12:28 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Apr 21, 2:05 PM EDT	Special Weather Statement	OKX	85 min
Apr 21, 2:12 PM EDT	Severe Thunderstorm Warning	OKX	48 min
Apr 21, 2:28 PM EDT	Severe Thunderstorm Warning	OKX	47 min
Apr 21, 2:53 PM EDT	Severe Thunderstorm Warning	OKX	67 min
Apr 22, 4:11 PM EDT	Freeze Warning	OKX	17 hr
Apr 28, 3:54 AM EDT	Coastal Flood Statement	OKX	23 hr
Apr 28, 8:23 PM EDT	Special Weather Statement	OKX	52 min
Apr 29, 3:47 AM EDT	Coastal Flood Advisory	OKX	23 hr
Apr 29, 3:30 PM EDT	Wind Advisory	OKX	36 hr
May 23, 1:20 PM EDT	Mesoscale Discussion	SPC	115 min
May 26, 2:48 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
May 26, 4:41 PM EDT	Mesoscale Discussion	SPC	64 min
May 26, 6:45 PM EDT	Special Weather Statement	OKX	60 min
May 26, 6:54 PM EDT	Severe Thunderstorm Warning	OKX	24 min
May 27, 1:25 PM EDT	Coastal Flood Advisory	OKX	62 hr
May 28, 4:04 PM EDT	Coastal Flood Advisory	OKX	37 hr
May 28, 11:55 PM EDT	Wind Advisory	OKX	6 hr
Jun 4, 3:09 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Jun 4, 3:28 PM EDT	Special Weather Statement	OKX	47 min
Jun 4, 3:32 PM EDT	Areal Flood Advisory	OKX	97 min
Jun 4, 3:43 PM EDT	Severe Thunderstorm Warning	OKX	47 min
Jun 4, 3:55 PM EDT	Areal Flood Advisory	OKX	95 min
Jun 4, 4:19 PM EDT	Severe Thunderstorm Warning	OKX	41 min
Jun 7, 2:17 PM EDT	Special Weather Statement	OKX	28 min
Jun 7, 3:43 PM EDT	Special Weather Statement	OKX	47 min
Jun 8, 2:07 PM EDT	Severe Thunderstorm Warning	OKX	38 min
Jun 8, 2:26 PM EDT	Special Weather Statement	OKX	49 min
Jun 8, 2:40 PM EDT	Severe Thunderstorm Warning	OKX	35 min
Jun 8, 3:06 PM EDT	Areal Flood Advisory	OKX	114 min
Jun 8, 3:10 PM EDT	Severe Thunderstorm Warning	OKX	50 min
Jun 8, 3:30 PM EDT	Flash Flood Warning	OKX	3 hr
Jun 9, 3:19 PM EDT	Mesoscale Discussion	SPC	116 min
Jun 19, 5:58 PM EDT	Special Weather Statement	OKX	47 min
Jun 19, 6:45 PM EDT	Special Weather Statement	OKX	45 min
Jun 21, 9:26 PM EDT	Severe Thunderstorm Warning	OKX	49 min
Jun 21, 9:44 PM EDT	Tornado Warning	OKX	21 min
Jun 21, 10:13 PM EDT	Special Weather Statement	OKX	47 min
Jun 26, 3:45 PM EDT	Heat Advisory	OKX	4 days
Jun 30, 3:21 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 30, 6:58 PM EDT	Mesoscale Discussion	SPC	92 min
Jul 1, 10:47 AM EDT	Flash Flood Watch	OKX	10 hr
Jul 1, 11:43 PM EDT	Areal Flood Advisory	OKX	78 min
Jul 2, 6:16 PM EDT	Areal Flood Advisory	OKX	119 min
Jul 2, 6:28 PM EDT	Special Weather Statement	OKX	47 min
Jul 2, 8:06 PM EDT	Areal Flood Advisory	OKX	84 min
Jul 2, 8:26 PM EDT	Flash Flood Warning	OKX	94 min
Jul 5, 4:08 AM EDT	Heat Advisory	OKX	64 hr
Jul 6, 12:33 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 6, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 6, 4:23 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 6, 5:25 PM EDT	Mesoscale Discussion	SPC	95 min
Jul 6, 5:49 PM EDT	Severe Thunderstorm Warning	OKX	56 min
Jul 6, 5:53 PM EDT	Severe Thunderstorm Warning	OKX	37 min
Jul 6, 6:28 PM EDT	Severe Thunderstorm Warning	OKX	47 min
Jul 7, 1:50 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 7, 2:41 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 7, 4:28 PM EDT	Flash Flood Watch	OKX	44 hr
Jul 7, 4:48 PM EDT	Mesoscale Discussion	SPC	87 min
Jul 7, 7:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 7, 11:46 PM EDT	Special Weather Statement	OKX	44 min
Jul 8, 12:00 AM EDT	Mesoscale Discussion	SPC	60 min
Jul 8, 12:29 AM EDT	Special Weather Statement	OKX	46 min
Jul 8, 1:44 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 8, 2:09 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 8, 2:11 PM EDT	Severe Thunderstorm Warning	OKX	49 min
Jul 8, 2:29 PM EDT	Areal Flood Advisory	OKX	2 hr
Jul 8, 3:15 PM EDT	Flash Flood Warning	OKX	3 hr
Jul 8, 3:53 PM EDT	Flash Flood Warning	OKX	3 hr
Jul 8, 4:36 PM EDT	Mesoscale Discussion	SPC	114 min
Jul 8, 5:06 PM EDT	Flash Flood Warning Considerable damage threat	OKX	3 hr
Jul 8, 6:15 PM EDT	Areal Flood Advisory	OKX	3 hr
Jul 8, 8:17 PM EDT	Areal Flood Advisory	OKX	3 hr
Jul 9, 5:30 AM EDT	Areal Flood Advisory	OKX	3 hr
Jul 9, 7:09 AM EDT	Areal Flood Advisory	OKX	3 hr
Jul 9, 8:29 AM EDT	Areal Flood Advisory	OKX	61 min
Jul 9, 8:56 AM EDT	Flash Flood Warning	OKX	3 hr
Jul 9, 10:22 AM EDT	Areal Flood Advisory	OKX	2 hr
Jul 11, 4:24 PM EDT	Flash Flood Watch	OKX	35 hr
Jul 14, 3:20 PM EDT	Heat Advisory	OKX	3 days
Jul 16, 2:43 PM EDT	Flash Flood Watch	OKX	37 hr
Jul 16, 5:51 PM EDT	Mesoscale Discussion	SPC	114 min
Jul 17, 12:00 PM EDT	Mesoscale Discussion	SPC	3 hr
Jul 17, 1:13 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
Jul 17, 4:38 PM EDT	Mesoscale Discussion	SPC	97 min
Jul 17, 8:25 PM EDT	Areal Flood Advisory	OKX	110 min
Jul 21, 10:32 AM EDT	Mesoscale Discussion	SPC	58 min
Jul 21, 11:56 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 21, 12:55 PM EDT	Special Weather Statement	OKX	50 min
Jul 25, 7:14 PM EDT	Special Weather Statement	OKX	46 min
Jul 25, 10:07 PM EDT	Special Weather Statement	OKX	38 min
Jul 25, 10:13 PM EDT	Areal Flood Advisory	OKX	82 min
Jul 25, 10:58 PM EDT	Severe Thunderstorm Warning	OKX	38 min
Jul 25, 11:43 PM EDT	Areal Flood Advisory	OKX	100 min
Jul 27, 4:36 PM EDT	Mesoscale Discussion	SPC	84 min
Jul 27, 6:09 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 27, 6:42 PM EDT	Special Weather Statement	OKX	48 min
Jul 27, 7:35 PM EDT	Severe Thunderstorm Warning	OKX	40 min
Jul 29, 3:46 PM EDT	Areal Flood Advisory	OKX	59 min
Jul 29, 5:02 PM EDT	Special Weather Statement	OKX	43 min
Jul 29, 5:35 PM EDT	Areal Flood Advisory	OKX	85 min
Aug 10, 3:53 AM EDT	Excessive Heat Warning	OKX	4 days
Aug 10, 3:53 AM EDT	Heat Advisory	OKX	37 hr
Aug 10, 3:35 PM EDT	Heat Advisory	OKX	3 days
Aug 11, 4:45 PM EDT	Excessive Heat Watch	OKX	23 hr
Aug 11, 4:57 PM EDT	Mesoscale Discussion	SPC	93 min
Aug 11, 6:44 PM EDT	Mesoscale Discussion	SPC	91 min
Aug 11, 7:58 PM EDT	Special Weather Statement	OKX	32 min
Aug 11, 8:32 PM EDT	Special Weather Statement	OKX	28 min
Aug 12, 5:04 PM EDT	Severe Thunderstorm Warning	OKX	22 min
Aug 19, 3:48 AM EDT	Tornado Warning	OKX	27 min
Aug 19, 4:17 AM EDT	Tornado Warning	OKX	28 min
Aug 19, 4:44 AM EDT	Tornado Warning	OKX	31 min
Aug 20, 5:29 AM EDT	Storm Surge Watch	OKX	54 hr
Aug 20, 5:29 AM EDT	Tropical Storm Watch	OKX	18 hr
Aug 20, 5:01 PM EDT	Storm Surge Warning	OKX	47 hr
Aug 20, 5:01 PM EDT	Tropical Storm Warning	OKX	51 hr
Aug 21, 3:02 AM EDT	Flood Watch	OKX	60 hr
Aug 21, 10:37 PM EDT	Areal Flood Advisory	OKX	83 min
Aug 22, 2:44 PM EDT	Flash Flood Warning	OKX	3 hr
Aug 22, 4:32 PM EDT	Coastal Flood Statement	OKX	10 hr
Aug 22, 4:51 PM EDT	Flash Flood Warning Considerable damage threat	OKX	6 hr
Aug 22, 11:08 PM EDT	Areal Flood Warning	OKX	8 hr
Aug 23, 3:16 PM EDT	Heat Advisory	OKX	4 days
Aug 23, 3:30 PM EDT	Areal Flood Advisory	OKX	90 min
Aug 26, 3:35 PM EDT	Flash Flood Watch	OKX	43 hr
Aug 30, 3:06 PM EDT	Flash Flood Watch	OKX	63 hr
Sep 1, 6:22 PM EDT	Tornado Watch	SPC	7 hr
Sep 1, 6:51 PM EDT	Flash Flood Warning	OKX	5 hr
Sep 1, 9:03 PM EDT	Severe Thunderstorm Warning	OKX	42 min
Sep 1, 9:06 PM EDT	Tornado Warning	OKX	24 min
Sep 1, 9:25 PM EDT	Severe Thunderstorm Warning	OKX	65 min
Sep 1, 9:28 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	OKX	2 hr
Sep 1, 10:08 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	OKX	4 hr
Sep 1, 10:20 PM EDT	Severe Thunderstorm Warning	OKX	55 min
Sep 1, 11:20 PM EDT	Mesoscale Discussion	SPC	85 min
Sep 1, 11:54 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	OKX	3 hr
Sep 2, 1:06 AM EDT	Areal Flood Warning	OKX	4 hr
Sep 2, 2:30 AM EDT	Areal Flood Warning	OKX	8 hr
Sep 2, 2:53 AM EDT	Areal Flood Warning	OKX	7 hr
Sep 2, 5:01 AM EDT	Areal Flood Warning	OKX	3 hr
Sep 2, 7:49 AM EDT	Areal Flood Advisory	OKX	10 hr
Sep 2, 10:07 AM EDT	Areal Flood Warning	OKX	15 hr
Sep 2, 10:16 AM EDT	Areal Flood Warning	OKX	25 hr
Sep 3, 11:25 AM EDT	Areal Flood Advisory	OKX	6 hr
Sep 15, 3:04 PM EDT	Mesoscale Discussion	SPC	116 min
Sep 18, 8:24 PM EDT	Special Weather Statement	OKX	36 min
Sep 18, 9:02 PM EDT	Special Weather Statement	OKX	28 min
Sep 22, 3:21 PM EDT	Flash Flood Watch	OKX	35 hr
Sep 23, 1:29 PM EDT	Mesoscale Discussion	SPC	61 min
Sep 23, 7:23 PM EDT	Areal Flood Advisory	OKX	5 hr
Sep 23, 8:03 PM EDT	Special Weather Statement	OKX	57 min
Oct 8, 4:03 PM EDT	Coastal Flood Advisory	OKX	24 hr
Oct 9, 3:56 PM EDT	Coastal Flood Advisory	OKX	25 hr
Oct 10, 5:12 PM EDT	Coastal Flood Advisory	OKX	24 hr
Oct 16, 4:53 PM EDT	Severe Thunderstorm Warning	OKX	67 min
Oct 16, 5:20 PM EDT	Severe Thunderstorm Warning	OKX	40 min
Oct 16, 5:54 PM EDT	Severe Thunderstorm Warning	OKX	38 min
Oct 24, 2:58 PM EDT	Flash Flood Watch	OKX	55 hr
Oct 25, 4:38 PM EDT	Coastal Flood Advisory	OKX	27 hr
Oct 25, 11:08 PM EDT	Special Weather Statement	OKX	37 min
Oct 26, 6:03 AM EDT	Areal Flood Advisory	OKX	3 hr
Oct 26, 9:08 AM EDT	Areal Flood Advisory	OKX	112 min
Oct 26, 3:36 PM EDT	Areal Flood Advisory	OKX	2 hr
Oct 26, 7:11 PM EDT	Areal Flood Advisory	OKX	3 hr
Oct 27, 5:36 PM EDT	Coastal Flood Statement	OKX	26 hr
Oct 29, 3:47 AM EDT	Wind Advisory	OKX	22 hr
Oct 29, 10:06 PM EDT	Special Weather Statement	OKX	39 min
Oct 30, 4:31 AM EDT	Coastal Flood Statement	OKX	4 hr
Nov 2, 3:41 AM EDT	Frost Advisory	OKX	28 hr
Nov 3, 3:58 AM EDT	Frost Advisory	OKX	29 hr
Nov 3, 3:58 AM EDT	Freeze Warning	OKX	29 hr
Nov 4, 3:48 PM EDT	Frost Advisory	OKX	17 hr
Nov 4, 3:53 PM EDT	Coastal Flood Statement	OKX	21 hr
Nov 5, 5:52 AM EDT	Freeze Warning	OKX	27 hr
Nov 5, 3:25 PM EDT	Coastal Flood Statement	OKX	23 hr
Nov 6, 5:57 PM EDT	Coastal Flood Advisory	OKX	22 hr
Nov 7, 6:09 PM EST	Coastal Flood Advisory	OKX	21 hr
Nov 12, 10:41 AM EST	Special Weather Statement	OKX	49 min
Nov 12, 11:08 AM EST	Special Weather Statement	OKX	82 min
Nov 13, 12:07 PM EST	Mesoscale Discussion	SPC	113 min
Nov 13, 12:27 PM EST	Severe Thunderstorm Watch	SPC	6 hr
Nov 13, 1:26 PM EST	Severe Thunderstorm Warning	OKX	49 min
Dec 2, 8:53 PM EST	Special Weather Statement	OKX	67 min
Dec 11, 3:56 AM EST	Wind Advisory	OKX	24 hr
Dec 11, 7:29 PM EST	Mesoscale Discussion	SPC	3 hr
Dec 24, 3:37 AM EST	Winter Weather Advisory	OKX	33 hr
Dec 27, 3:45 AM EST	Winter Weather Advisory	OKX	27 hr
Dec 30, 3:30 PM EST	Coastal Flood Statement	OKX	19 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	24
Tornado Warning	5
Severe Thunderstorm Watch	10
Tornado Watch	1
Mesoscale Discussion	31
Special Weather Statement	30
Flooding
Areal Flood Warning	7
Flash Flood Warning	12
Flash Flood Watch	8
Flood Watch	1
Areal Flood Advisory	28
Winter
Winter Storm Warning	2
Winter Storm Watch	3
Winter Weather Advisory	11
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	6
Cold
Freeze Warning	4
Frost Advisory	3
Wind and dust
Wind Advisory	10
Fog and smoke
Dense Fog Advisory	1
Tropical
Storm Surge Warning	1
Tropical Storm Warning	1
Storm Surge Watch	1
Tropical Storm Watch	1
Coast and beach
Coastal Flood Advisory	13
Coastal Flood Statement	9

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.