Weather alerts in Lewis County, New York, 2023

155 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Lewis County and its neighbors

Each county as a circle sized by its count in 2023. Tap one for its archive.

Alerts: 155
Warnings: 49
Watches: 21
Advisories: 23
Busiest month: August36 alerts
Busiest day: August 7, 20239 alerts

Over time

By month

Warning verification

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

3 of 4 tornado warnings covering Lewis County in 2023 had a tornado report inside them; 3 of 4 tornado reports fell inside a warning, on average 23 minutes after it went out.

Lewis County, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	4	3	25%	4	75%	23 min
Severe thunderstorm warnings	21	13	38%	16	94%	25 min
Flash flood warnings	3	3	0%	8	100%	91 min

Each office's whole area, 2023

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Buffalo, NY: tornado warnings	5	3	40%	4	75%	23 min
NWS Buffalo, NY: severe thunderstorm warnings	78	54	31%	215	96%	26 min
NWS Buffalo, NY: flash flood warnings	16	13	19%	45	100%	83 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 12, 12:17 PM EST	Winter Weather Advisory	BUF	39 hr
Jan 16, 2:59 PM EST	Winter Weather Advisory	BUF	32 hr
Jan 18, 2:50 PM EST	Winter Weather Advisory	BUF	55 hr
Jan 19, 6:21 PM EST	Mesoscale Discussion	SPC	2 hr
Jan 23, 12:54 PM EST	Winter Weather Advisory	BUF	29 hr
Jan 24, 3:30 AM EST	Winter Storm Watch	BUF	11 hr
Jan 24, 2:44 PM EST	Winter Storm Warning	BUF	51 hr
Jan 29, 4:46 PM EST	Winter Weather Advisory	BUF	4 hr
Jan 31, 2:47 PM EST	Wind Chill Watch	BUF	25 hr
Jan 31, 2:47 PM EST	Winter Weather Advisory	BUF	22 hr
Feb 1, 12:44 PM EST	Lake Effect Snow Warning	BUF	15 hr
Feb 1, 2:17 PM EST	Special Weather Statement	BUF	58 min
Feb 1, 3:31 PM EST	Special Weather Statement	BUF	119 min
Feb 1, 3:47 PM EST	Wind Chill Warning	BUF	69 hr
Feb 1, 5:23 PM EST	Special Weather Statement	BUF	52 min
Feb 1, 6:21 PM EST	Special Weather Statement	BUF	114 min
Feb 1, 8:49 PM EST	Special Weather Statement	BUF	116 min
Feb 2, 8:36 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 2, 9:06 PM EST	Snow Squall Warning	BUF	54 min
Feb 2, 9:58 PM EST	Snow Squall Warning	BUF	32 min
Feb 14, 1:53 PM EST	Wind Advisory	BUF	29 hr
Feb 16, 3:48 AM EST	Winter Weather Advisory	BUF	33 hr
Feb 21, 3:13 AM EST	Winter Storm Watch	BUF	24 hr
Feb 21, 2:23 PM EST	Winter Weather Advisory	BUF	58 hr
Feb 22, 3:23 AM EST	Winter Storm Warning	BUF	30 hr
Feb 22, 8:59 PM EST	Mesoscale Discussion	SPC	6 hr
Feb 23, 6:54 PM EST	Mesoscale Discussion	SPC	4 hr
Feb 26, 3:07 AM EST	Winter Storm Watch	BUF	24 hr
Feb 26, 2:49 PM EST	Special Weather Statement	BUF	86 min
Feb 27, 3:22 AM EST	Winter Weather Advisory	BUF	35 hr
Feb 28, 7:31 AM EST	Special Weather Statement	BUF	119 min
Mar 2, 3:22 AM EST	Winter Storm Watch	BUF	24 hr
Mar 3, 3:31 AM EST	Winter Storm Warning	BUF	33 hr
Mar 12, 4:03 AM EDT	Winter Storm Watch	BUF	24 hr
Mar 13, 4:01 AM EDT	Winter Storm Warning	BUF	48 hr
Mar 16, 2:25 PM EDT	Winter Storm Watch	BUF	24 hr
Mar 17, 2:04 PM EDT	Lake Effect Snow Warning	BUF	54 hr
Mar 19, 6:08 AM EDT	Special Weather Statement	BUF	67 min
Mar 19, 6:55 AM EDT	Special Weather Statement	ALY	65 min
Mar 24, 2:02 PM EDT	Wind Advisory	BUF	45 hr
Mar 29, 5:05 PM EDT	Mesoscale Discussion	SPC	4 hr
Apr 5, 11:09 AM EDT	Severe Thunderstorm Warning	BUF	66 min
Apr 5, 11:52 AM EDT	Special Weather Statement	BUF	53 min
Apr 5, 12:11 PM EDT	Severe Thunderstorm Warning	BUF	46 min
Apr 22, 6:32 PM EDT	Special Weather Statement	BUF	43 min
Apr 22, 6:57 PM EDT	Severe Thunderstorm Warning	BUF	63 min
Apr 22, 7:30 PM EDT	Special Weather Statement	BUF	30 min
Apr 22, 7:34 PM EDT	Special Weather Statement	ALY	26 min
Apr 22, 8:05 PM EDT	Special Weather Statement	BUF	25 min
May 13, 12:32 PM EDT	Frost Advisory	BUF	18 hr
May 14, 12:54 PM EDT	Frost Advisory	BUF	18 hr
May 15, 1:48 PM EDT	Freeze Watch	BUF	24 hr
May 16, 1:35 PM EDT	Freeze Warning	BUF	19 hr
May 17, 3:53 AM EDT	Freeze Watch	BUF	7 hr
May 17, 10:57 AM EDT	Freeze Warning	BUF	21 hr
May 25, 4:20 AM EDT	Frost Advisory	BUF	28 hr
Jun 6, 4:08 PM EDT	Special Weather Statement	BUF	37 min
Jun 6, 4:29 PM EDT	Special Weather Statement	BUF	61 min
Jun 6, 5:16 PM EDT	Special Weather Statement	BUF	59 min
Jun 26, 1:11 PM EDT	Severe Thunderstorm Watch	SPC	11 hr
Jun 26, 1:47 PM EDT	Special Weather Statement	BUF	58 min
Jun 26, 8:06 PM EDT	Special Weather Statement	BUF	39 min
Jun 27, 6:41 PM EDT	Special Weather Statement	BUF	64 min
Jun 27, 8:21 PM EDT	Special Weather Statement	BUF	39 min
Jul 1, 1:54 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 1, 5:17 PM EDT	Special Weather Statement	BUF	58 min
Jul 5, 1:48 PM EDT	Heat Advisory	BUF	30 hr
Jul 9, 2:07 PM EDT	Special Weather Statement	BUF	53 min
Jul 9, 3:47 PM EDT	Special Weather Statement	BUF	28 min
Jul 9, 6:13 PM EDT	Flash Flood Warning	BUF	4 hr
Jul 10, 11:16 AM EDT	Flood Watch	BUF	9 hr
Jul 12, 10:45 AM EDT	Flood Watch	BUF	29 hr
Jul 13, 11:58 AM EDT	Mesoscale Discussion	SPC	2 hr
Jul 13, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 13, 1:40 PM EDT	Severe Thunderstorm Warning	BUF	65 min
Jul 13, 2:33 PM EDT	Severe Thunderstorm Warning	BUF	57 min
Jul 13, 3:20 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 13, 3:28 PM EDT	Severe Thunderstorm Warning	BUF	32 min
Jul 18, 12:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 18, 12:20 PM EDT	Special Weather Statement	ALY	25 min
Jul 20, 6:19 PM EDT	Severe Thunderstorm Watch	SPC	9 hr
Jul 24, 11:58 AM EDT	Mesoscale Discussion	SPC	2 hr
Jul 24, 1:06 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 24, 2:56 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 24, 4:29 PM EDT	Special Weather Statement	BUF	46 min
Jul 24, 4:55 PM EDT	Severe Thunderstorm Warning	BUF	65 min
Jul 24, 5:53 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 3, 7:33 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 3, 7:52 PM EDT	Special Weather Statement	BUF	68 min
Aug 3, 7:59 PM EDT	Severe Thunderstorm Warning	BUF	46 min
Aug 3, 9:01 PM EDT	Severe Thunderstorm Warning	BUF	59 min
Aug 3, 9:32 PM EDT	Special Weather Statement	ALY	28 min
Aug 4, 11:28 AM EDT	Special Weather Statement	BUF	47 min
Aug 4, 12:10 PM EDT	Severe Thunderstorm Watch	SPC	10 hr
Aug 4, 12:16 PM EDT	Special Weather Statement	BUF	44 min
Aug 4, 12:56 PM EDT	Special Weather Statement	BUF	49 min
Aug 4, 1:47 PM EDT	Special Weather Statement	BUF	43 min
Aug 4, 5:47 PM EDT	Special Weather Statement	BUF	28 min
Aug 7, 3:59 PM EDT	Severe Thunderstorm Warning	BUF	46 min
Aug 7, 4:45 PM EDT	Severe Thunderstorm Warning	BUF	45 min
Aug 7, 5:01 PM EDT	Mesoscale Discussion	SPC	89 min
Aug 7, 5:26 PM EDT	Special Weather Statement	BUF	49 min
Aug 7, 6:19 PM EDT	Tornado Warning	BUF	25 min
Aug 7, 6:51 PM EDT	Severe Thunderstorm Warning	BUF	54 min
Aug 7, 6:57 PM EDT	Tornado Warning	BUF	33 min
Aug 7, 7:29 PM EDT	Tornado Warning	BUF	23 min
Aug 7, 7:56 PM EDT	Severe Thunderstorm Warning	BUF	64 min
Aug 7, 8:07 PM EDT	Tornado Warning	BUF	38 min
Aug 7, 9:09 PM EDT	Flash Flood Warning	BUF	4 hr
Aug 8, 7:01 PM EDT	Areal Flood Warning	BUF	14 hr
Aug 9, 3:04 AM EDT	Areal Flood Warning	BUF	6 hr
Aug 9, 9:12 AM EDT	Areal Flood Warning	BUF	24 hr
Aug 12, 12:50 PM EDT	Tornado Watch	SPC	8 hr
Aug 12, 1:33 PM EDT	Special Weather Statement	BUF	57 min
Aug 12, 1:41 PM EDT	Severe Thunderstorm Warning	BUF	46 min
Aug 12, 2:07 PM EDT	Severe Thunderstorm Warning	BUF	53 min
Aug 12, 5:17 PM EDT	Special Weather Statement	BUF	43 min
Aug 12, 5:25 PM EDT	Severe Thunderstorm Warning	BUF	35 min
Aug 12, 6:57 PM EDT	Severe Thunderstorm Warning	BUF	63 min
Aug 12, 7:23 PM EDT	Severe Thunderstorm Warning	BUF	67 min
Aug 12, 7:44 PM EDT	Severe Thunderstorm Warning	BUF	61 min
Aug 16, 5:40 AM EDT	Special Weather Statement	BUF	50 min
Aug 16, 5:08 PM EDT	Areal Flood Warning	BUF	24 hr
Sep 4, 2:04 PM EDT	Heat Advisory	BUF	29 hr
Sep 5, 3:40 PM EDT	Heat Advisory	BUF	27 hr
Sep 6, 11:17 PM EDT	Severe Thunderstorm Warning	BUF	58 min
Sep 7, 12:11 AM EDT	Special Weather Statement	BUF	79 min
Sep 7, 6:13 PM EDT	Mesoscale Discussion	SPC	92 min
Sep 7, 7:28 PM EDT	Severe Thunderstorm Warning	BUF	47 min
Sep 7, 7:51 PM EDT	Mesoscale Discussion	SPC	84 min
Sep 7, 8:13 PM EDT	Special Weather Statement	BUF	32 min
Sep 9, 10:04 PM EDT	Special Weather Statement	BUF	56 min
Sep 20, 2:54 PM EDT	Frost Advisory	BUF	16 hr
Oct 7, 12:06 AM EDT	Special Weather Statement	BUF	114 min
Oct 7, 12:25 AM EDT	Flash Flood Warning	BUF	6 hr
Oct 8, 3:55 AM EDT	Flood Watch	BUF	27 hr
Oct 8, 1:13 PM EDT	Areal Flood Warning	BUF	6 hr
Nov 8, 3:37 AM EST	Winter Weather Advisory	BUF	29 hr
Nov 9, 2:36 AM EST	Mesoscale Discussion	SPC	4 hr
Nov 20, 2:28 PM EST	Winter Weather Advisory	BUF	34 hr
Nov 25, 2:43 PM EST	Winter Storm Watch	BUF	13 hr
Nov 26, 3:48 AM EST	Lake Effect Snow Warning	BUF	3 days
Nov 27, 7:06 PM EST	Special Weather Statement	BUF	114 min
Nov 27, 10:28 PM EST	Special Weather Statement	BUF	2 hr
Nov 28, 2:16 AM EST	Mesoscale Discussion	SPC	4 hr
Nov 29, 8:01 AM EST	Special Weather Statement	BUF	74 min
Dec 9, 2:24 PM EST	Winter Storm Watch	BUF	13 hr
Dec 10, 3:37 AM EST	Winter Weather Advisory	BUF	36 hr
Dec 11, 12:55 PM EST	Winter Storm Watch	BUF	15 hr
Dec 12, 3:51 AM EST	Winter Weather Advisory	BUF	38 hr
Dec 18, 10:17 AM EST	Areal Flood Warning	BUF	12 hr
Dec 18, 7:53 PM EST	River Flood Warning	BUF	14 hr
Dec 18, 11:28 PM EST	River Flood Warning	BUF	15 hr
Dec 19, 9:50 AM EST	River Flood Warning	BUF	57 hr
Dec 28, 9:07 AM EST	Dense Fog Advisory	BUF	22 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	21
Tornado Warning	4
Severe Thunderstorm Watch	5
Tornado Watch	1
Mesoscale Discussion	18
Special Weather Statement	44
Flooding
Areal Flood Warning	6
Flash Flood Warning	3
River Flood Warning	3
Flood Watch	3
Winter
Lake Effect Snow Warning	3
Snow Squall Warning	2
Winter Storm Warning	4
Winter Storm Watch	9
Winter Weather Advisory	13
Heat
Heat Advisory	3
Cold
Freeze Warning	2
Wind Chill Warning	1
Freeze Watch	2
Wind Chill Watch	1
Frost Advisory	4
Wind and dust
Wind Advisory	2
Fog and smoke
Dense Fog Advisory	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2022 2024

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.