Alert archive / New York / Jefferson County

Weather alerts in Jefferson County, New York, 2009

97 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Jefferson County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts: 97
Warnings: 28
Watches: 21
Advisories: 35
Busiest month: January20 alerts
Busiest day: July 11, 20096 alerts

Over time

By month

Warning verification

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

Jefferson County, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	16	6	63%	6	83%	20 min
Flash flood warnings	0			0

Each office's whole area, 2009

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Buffalo, NY: tornado warnings	7	2	71%	5	40%	7 min
NWS Buffalo, NY: severe thunderstorm warnings	109	57	48%	134	92%	30 min
NWS Buffalo, NY: flash flood warnings	29	12	59%	27	89%	51 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, 3:21 AM EST	Lake Effect Snow Advisory	BUF	23 hr
Jan 4, 4:39 PM EST	Winter Weather Advisory	BUF	14 hr
Jan 6, 3:53 AM EST	Winter Storm Watch	BUF	11 hr
Jan 6, 2:48 PM EST	Winter Storm Warning	BUF	27 hr
Jan 7, 3:48 PM EST	Lake Effect Snow Warning	BUF	48 hr
Jan 12, 3:09 PM EST	Winter Weather Advisory	BUF	31 hr
Jan 13, 3:42 PM EST	Wind Chill Advisory	BUF	19 hr
Jan 14, 4:21 AM EST	Lake Effect Snow Watch	BUF	42 hr
Jan 14, 3:32 PM EST	Lake Effect Snow Warning	BUF	71 hr
Jan 14, 3:32 PM EST	Wind Chill Advisory	BUF	15 hr
Jan 15, 3:46 PM EST	Wind Chill Advisory	BUF	43 hr
Jan 17, 2:07 PM EST	Winter Weather Advisory	BUF	32 hr
Jan 19, 9:16 AM EST	Lake Effect Snow Advisory	BUF	12 hr
Jan 21, 12:47 PM EST	Lake Effect Snow Warning	BUF	15 hr
Jan 23, 3:31 PM EST	Lake Effect Snow Watch	BUF	13 hr
Jan 24, 4:30 AM EST	Lake Effect Snow Warning	BUF	3 days
Jan 24, 4:30 AM EST	Wind Chill Advisory	BUF	23 hr
Jan 26, 3:42 PM EST	Winter Storm Watch	BUF	20 hr
Jan 27, 11:48 AM EST	Winter Storm Warning	BUF	34 hr
Jan 29, 3:35 AM EST	Lake Effect Snow Advisory	BUF	47 hr
Feb 10, 3:12 PM EST	High Wind Watch	BUF	23 hr
Feb 11, 2:34 PM EST	Wind Advisory	BUF	21 hr
Feb 11, 3:27 PM EST	Winter Weather Advisory	BUF	33 hr
Feb 18, 3:18 PM EST	Lake Effect Snow Watch	BUF	12 hr
Feb 19, 3:34 AM EST	Lake Effect Snow Warning	BUF	48 hr
Feb 22, 4:09 AM EST	Lake Effect Snow Advisory	BUF	41 hr
Feb 22, 9:44 AM EST	Winter Weather Advisory	BUF	4 hr
Feb 26, 3:33 PM EST	Wind Advisory	BUF	23 hr
Mar 2, 3:29 PM EST	Wind Chill Advisory	BUF	18 hr
Mar 7, 11:46 AM EST	Flood Watch	BUF	44 hr
Mar 9, 10:28 PM EDT	Flood Watch	BUF	36 hr
Mar 10, 9:36 PM EDT	Wind Advisory	BUF	24 hr
Apr 3, 4:29 AM EDT	Wind Advisory	BUF	40 hr
Apr 4, 3:22 PM EDT	Winter Weather Advisory	BUF	13 hr
Apr 5, 4:52 AM EDT	Winter Storm Watch	BUF	34 hr
Apr 6, 3:04 PM EDT	Lake Effect Snow Warning	BUF	44 hr
Apr 20, 3:20 AM EDT	Wind Advisory	BUF	18 hr
May 8, 10:22 PM EDT	Severe Thunderstorm Warning	BUF	38 min
May 9, 4:07 AM EDT	Wind Advisory	BUF	20 hr
May 9, 12:43 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
May 9, 1:28 PM EDT	Severe Thunderstorm Warning	BUF	46 min
May 9, 1:48 PM EDT	Severe Thunderstorm Warning	BUF	57 min
May 16, 12:38 PM EDT	Severe Thunderstorm Warning	BUF	67 min
May 16, 1:45 PM EDT	Severe Thunderstorm Warning	BUF	60 min
May 17, 4:48 AM EDT	Freeze Warning	BUF	27 hr
May 18, 3:04 PM EDT	Freeze Warning	BUF	16 hr
May 25, 3:14 AM EDT	Frost Advisory	BUF	28 hr
May 30, 3:34 PM EDT	Freeze Watch	BUF	21 hr
May 31, 12:10 PM EDT	Frost Advisory	BUF	20 hr
Jun 25, 12:14 PM EDT	Mesoscale Discussion	SPC	61 min
Jun 25, 12:38 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jun 26, 12:06 PM EDT	Mesoscale Discussion	SPC	54 min
Jun 26, 12:32 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 26, 3:11 PM EDT	Severe Thunderstorm Warning	BUF	49 min
Jun 26, 3:46 PM EDT	Severe Thunderstorm Warning	BUF	31 min
Jun 26, 6:29 PM EDT	Mesoscale Discussion	SPC	61 min
Jul 2, 10:05 AM EDT	Flash Flood Watch	BUF	10 hr
Jul 2, 1:55 PM EDT	Areal Flood Advisory	BUF	110 min
Jul 7, 7:30 AM EDT	Severe Thunderstorm Warning	BUF	34 min
Jul 7, 11:48 AM EDT	Severe Thunderstorm Warning	BUF	42 min
Jul 11, 10:11 AM EDT	Severe Thunderstorm Warning	BUF	53 min
Jul 11, 10:31 AM EDT	Mesoscale Discussion	SPC	59 min
Jul 11, 10:57 AM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 11, 11:47 AM EDT	Severe Thunderstorm Warning	BUF	58 min
Jul 11, 1:32 PM EDT	Severe Thunderstorm Warning	BUF	58 min
Jul 11, 7:06 PM EDT	Mesoscale Discussion	SPC	114 min
Aug 4, 6:09 PM EDT	Mesoscale Discussion	SPC	66 min
Aug 4, 7:10 PM EDT	Severe Thunderstorm Warning	BUF	65 min
Aug 10, 3:13 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Aug 10, 8:15 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 13, 3:47 AM EDT	Dense Fog Advisory	BUF	5 hr
Aug 18, 2:32 PM EDT	Mesoscale Discussion	SPC	88 min
Aug 20, 10:38 PM EDT	Severe Thunderstorm Watch	SPC	2 hr
Sep 19, 4:36 AM EDT	Frost Advisory	BUF	27 hr
Sep 23, 1:18 PM EDT	Mesoscale Discussion	SPC	57 min
Sep 25, 2:40 PM EDT	Frost Advisory	BUF	17 hr
Sep 28, 11:35 AM EDT	Severe Thunderstorm Watch	SPC	3 hr
Sep 28, 1:45 PM EDT	Mesoscale Discussion	SPC	90 min
Sep 28, 1:47 PM EDT	Severe Thunderstorm Warning	BUF	58 min
Oct 11, 4:09 AM EDT	Freeze Warning	BUF	29 hr
Oct 30, 3:44 PM EDT	Wind Advisory	BUF	26 hr
Dec 8, 4:33 AM EST	High Wind Watch	BUF	11 hr
Dec 8, 3:48 PM EST	High Wind Warning	BUF	42 hr
Dec 8, 4:05 PM EST	Winter Storm Watch	BUF	24 hr
Dec 8, 4:05 PM EST	Winter Weather Advisory	BUF	20 hr
Dec 8, 11:32 PM EST	Mesoscale Discussion	SPC	6 hr
Dec 9, 3:49 PM EST	Lake Effect Snow Warning	BUF	66 hr
Dec 9, 11:58 PM EST	Mesoscale Discussion	SPC	4 hr
Dec 10, 9:44 AM EST	Wind Advisory	BUF	18 hr
Dec 10, 7:51 PM EST	Mesoscale Discussion	SPC	6 hr
Dec 13, 4:02 AM EST	Freezing Rain Advisory	BUF	11 hr
Dec 15, 3:49 PM EST	Lake Effect Snow Advisory	BUF	34 hr
Dec 24, 4:07 PM EST	Winter Storm Watch	BUF	23 hr
Dec 25, 3:28 PM EST	Winter Weather Advisory	BUF	18 hr
Dec 27, 3:23 PM EST	Winter Weather Advisory	BUF	19 hr
Dec 28, 5:30 AM EST	Lake Effect Snow Warning	BUF	34 hr
Dec 28, 5:30 AM EST	Lake Effect Snow Advisory	BUF	47 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	14
Severe Thunderstorm Watch	7
Mesoscale Discussion	13
Flooding
Flash Flood Watch	1
Flood Watch	2
Areal Flood Advisory	1
Winter
Lake Effect Snow Warning	8
Winter Storm Warning	2
Lake Effect Snow Watch	3
Winter Storm Watch	5
Freezing Rain Advisory	1
Lake Effect Snow Advisory	6
Winter Weather Advisory	9
Cold
Freeze Warning	3
Freeze Watch	1
Frost Advisory	4
Wind Chill Advisory	5
Wind and dust
High Wind Warning	1
High Wind Watch	2
Wind Advisory	8
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 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.