Alert archive / New York / Jefferson County
Weather alerts in Jefferson County, New York, 2020
171 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 171
- Warnings
- 45
- Watches
- 22
- Advisories
- 35
- Busiest month
- January23 alerts
- Busiest day
- July 13, 20208 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 1 tornado warnings covering Jefferson County in 2020 had a tornado report inside them.
Jefferson County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 1 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 15 | 8 | 47% | 10 | 100% | 28 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Buffalo, NY: tornado warnings | 6 | 1 | 83% | 2 | 50% | 3 min |
| NWS Buffalo, NY: severe thunderstorm warnings | 109 | 74 | 32% | 244 | 84% | 28 min |
| NWS Buffalo, NY: flash flood warnings | 17 | 10 | 41% | 31 | 94% | 68 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 5, 3:30 AM EST | Lakeshore Flood Watch | BUF | 11 hr |
| Jan 5, 2:43 PM EST | Lakeshore Flood Warning | BUF | 31 hr |
| Jan 5, 2:43 PM EST | Winter Weather Advisory | BUF | 19 hr |
| Jan 6, 9:52 AM EST | Lake Effect Snow Warning | BUF | 13 hr |
| Jan 6, 8:31 PM EST | Special Weather Statement | BUF | 59 min |
| Jan 7, 1:25 PM EST | Winter Weather Advisory | BUF | 29 hr |
| Jan 8, 6:37 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 9, 2:17 PM EST | Winter Weather Advisory | BUF | 22 hr |
| Jan 9, 2:22 PM EST | Flood Watch | BUF | 70 hr |
| Jan 10, 1:40 PM EST | Lakeshore Flood Watch | BUF | 22 hr |
| Jan 10, 1:40 PM EST | Winter Storm Watch | BUF | 23 hr |
| Jan 11, 12:02 PM EST | Lakeshore Flood Warning | BUF | 24 hr |
| Jan 11, 12:20 PM EST | Ice Storm Warning | BUF | 16 hr |
| Jan 11, 12:20 PM EST | Wind Advisory | BUF | 25 hr |
| Jan 12, 4:13 AM EST | Winter Weather Advisory | BUF | 7 hr |
| Jan 13, 3:51 AM EST | Winter Weather Advisory | BUF | 13 hr |
| Jan 15, 5:07 AM EST | Winter Weather Advisory | BUF | 47 hr |
| Jan 16, 6:23 AM EST | Wind Chill Advisory | BUF | 28 hr |
| Jan 17, 3:49 AM EST | Winter Storm Watch | BUF | 10 hr |
| Jan 17, 3:52 AM EST | Lakeshore Flood Watch | BUF | 24 hr |
| Jan 17, 1:38 PM EST | Winter Storm Warning | BUF | 46 hr |
| Jan 18, 4:03 AM EST | Lakeshore Flood Warning | BUF | 32 hr |
| Jan 25, 3:59 PM EST | Winter Weather Advisory | BUF | 41 hr |
| Feb 5, 4:17 AM EST | Winter Storm Watch | BUF | 35 hr |
| Feb 5, 4:17 AM EST | Winter Weather Advisory | BUF | 3 days |
| Feb 6, 3:04 PM EST | Winter Storm Warning | BUF | 31 hr |
| Feb 11, 3:01 PM EST | Winter Weather Advisory | BUF | 43 hr |
| Feb 13, 2:22 PM EST | Wind Chill Advisory | BUF | 20 hr |
| Feb 17, 3:35 AM EST | Winter Weather Advisory | BUF | 32 hr |
| Feb 17, 12:23 PM EST | Wind Advisory | BUF | 28 hr |
| Feb 25, 4:08 AM EST | Lakeshore Flood Watch | BUF | 33 hr |
| Feb 25, 4:21 AM EST | Winter Storm Watch | BUF | 24 hr |
| Feb 26, 4:27 AM EST | Lake Effect Snow Warning | BUF | 9 hr |
| Feb 26, 4:32 AM EST | Lakeshore Flood Warning | BUF | 62 hr |
| Feb 26, 12:58 PM EST | Blizzard Warning | BUF | 48 hr |
| Feb 28, 2:55 AM EST | Lake Effect Snow Warning | BUF | 31 hr |
| Mar 2, 11:57 PM EST | Dense Fog Advisory | BUF | 10 hr |
| Mar 3, 7:16 PM EST | Special Weather Statement | BUF | 59 min |
| Mar 12, 1:34 PM EDT | Lakeshore Flood Watch | BUF | 14 hr |
| Mar 12, 2:11 PM EDT | Wind Advisory | BUF | 29 hr |
| Mar 13, 3:57 AM EDT | Lakeshore Flood Warning | BUF | 27 hr |
| Mar 20, 1:59 AM EDT | High Wind Warning | BUF | 15 hr |
| Mar 20, 1:59 AM EDT | Wind Advisory | BUF | 15 hr |
| Mar 29, 2:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Mar 29, 5:06 PM EDT | Special Weather Statement | BUF | 24 min |
| Mar 29, 5:11 PM EDT | Severe Thunderstorm Warning | BUF | 24 min |
| Mar 29, 7:41 PM EDT | Special Weather Statement | BUF | 34 min |
| Apr 8, 4:40 AM EDT | Lakeshore Flood Watch | BUF | 6 hr |
| Apr 8, 10:46 AM EDT | Lakeshore Flood Warning | BUF | 54 hr |
| Apr 9, 4:34 AM EDT | Winter Weather Advisory | BUF | 33 hr |
| Apr 10, 4:32 PM EDT | High Wind Watch | BUF | 12 hr |
| Apr 11, 4:34 AM EDT | Lakeshore Flood Watch | BUF | 8 hr |
| Apr 11, 4:57 AM EDT | High Wind Warning | BUF | 64 hr |
| Apr 11, 12:24 PM EDT | Lakeshore Flood Warning | BUF | 66 hr |
| Apr 20, 4:19 AM EDT | Lakeshore Flood Watch | BUF | 12 hr |
| Apr 20, 3:59 PM EDT | Lakeshore Flood Warning | BUF | 36 hr |
| Apr 29, 3:43 AM EDT | Wind Advisory | BUF | 42 hr |
| May 9, 4:17 AM EDT | Lakeshore Flood Warning | BUF | 18 hr |
| May 10, 1:48 PM EDT | Freeze Watch | BUF | 14 hr |
| May 11, 3:18 AM EDT | Freeze Warning | BUF | 30 hr |
| May 12, 10:03 AM EDT | Freeze Warning | BUF | 23 hr |
| May 13, 10:48 AM EDT | Freeze Warning | BUF | 20 hr |
| May 29, 1:42 PM EDT | Severe Thunderstorm Warning | BUF | 34 min |
| May 29, 1:56 PM EDT | Beach Hazards Statement | BUF | 14 hr |
| May 29, 3:23 PM EDT | Severe Thunderstorm Warning | BUF | 47 min |
| Jun 3, 6:43 PM EDT | Special Weather Statement | BUF | 47 min |
| Jun 3, 7:01 PM EDT | Severe Thunderstorm Warning | BUF | 44 min |
| Jun 5, 11:28 PM EDT | Special Weather Statement | BUF | 32 min |
| Jun 6, 3:03 PM EDT | Special Weather Statement | BUF | 57 min |
| Jun 6, 3:48 PM EDT | Special Weather Statement | BUF | 57 min |
| Jun 6, 5:54 PM EDT | Special Weather Statement | BUF | 51 min |
| Jun 11, 2:26 AM EDT | Special Weather Statement | BUF | 64 min |
| Jun 11, 4:18 AM EDT | Beach Hazards Statement | BUF | 18 hr |
| Jun 12, 4:18 AM EDT | Beach Hazards Statement | BUF | 18 hr |
| Jun 22, 10:33 AM EDT | Heat Advisory | BUF | 8 hr |
| Jun 23, 4:38 PM EDT | Beach Hazards Statement | BUF | 30 hr |
| Jun 27, 7:10 PM EDT | Special Weather Statement | BUF | 50 min |
| Jun 28, 7:29 PM EDT | Special Weather Statement | BUF | 31 min |
| Jun 28, 8:08 PM EDT | Special Weather Statement | BUF | 52 min |
| Jun 28, 9:12 PM EDT | Severe Thunderstorm Warning | BUF | 33 min |
| Jun 28, 9:55 PM EDT | Special Weather Statement | BUF | 35 min |
| Jul 2, 6:54 PM EDT | Special Weather Statement | BUF | 36 min |
| Jul 5, 6:13 PM EDT | Special Weather Statement | BUF | 47 min |
| Jul 6, 4:01 AM EDT | Heat Advisory | BUF | 5 days |
| Jul 11, 2:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 11, 4:11 PM EDT | Severe Thunderstorm Warning | BUF | 64 min |
| Jul 11, 4:37 PM EDT | Severe Thunderstorm Warning | BUF | 53 min |
| Jul 11, 5:26 PM EDT | Severe Thunderstorm Warning | BUF | 64 min |
| Jul 13, 3:31 AM EDT | Special Weather Statement | BUF | 29 min |
| Jul 13, 3:54 AM EDT | Areal Flood Warning | BUF | 3 hr |
| Jul 13, 4:09 AM EDT | Special Weather Statement | BUF | 66 min |
| Jul 13, 5:05 PM EDT | Severe Thunderstorm Warning | BUF | 55 min |
| Jul 13, 5:38 PM EDT | Tornado Warning | BUF | 22 min |
| Jul 13, 6:00 PM EDT | Severe Thunderstorm Warning | BUF | 35 min |
| Jul 13, 6:20 PM EDT | Severe Thunderstorm Warning | BUF | 37 min |
| Jul 13, 6:33 PM EDT | Special Weather Statement | BUF | 27 min |
| Jul 18, 1:46 PM EDT | Heat Advisory | BUF | 26 hr |
| Jul 19, 12:53 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 6:03 PM EDT | Severe Thunderstorm Warning | BUF | 57 min |
| Jul 29, 1:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 2, 4:17 AM EDT | Beach Hazards Statement | BUF | 31 hr |
| Aug 2, 2:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 3:10 PM EDT | Tornado Watch | SPC | 7 hr |
| Aug 5, 4:47 AM EDT | Beach Hazards Statement | BUF | 16 hr |
| Aug 5, 5:47 AM EDT | Special Weather Statement | BUF | 43 min |
| Aug 5, 6:30 AM EDT | Special Weather Statement | BUF | 60 min |
| Aug 5, 7:47 AM EDT | Special Weather Statement | BUF | 43 min |
| Aug 5, 8:43 AM EDT | Special Weather Statement | BUF | 47 min |
| Aug 11, 3:59 AM EDT | Heat Advisory | BUF | 14 hr |
| Aug 16, 10:31 PM EDT | Special Weather Statement | BUF | 59 min |
| Aug 16, 11:54 PM EDT | Special Weather Statement | BUF | 66 min |
| Aug 18, 4:36 PM EDT | Special Weather Statement | BUF | 39 min |
| Aug 18, 5:07 PM EDT | Special Weather Statement | BUF | 53 min |
| Aug 21, 3:05 PM EDT | Special Weather Statement | BUF | 25 min |
| Aug 21, 3:26 PM EDT | Special Weather Statement | BUF | 34 min |
| Aug 25, 12:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 25, 3:14 AM EDT | Special Weather Statement | BUF | 91 min |
| Aug 25, 4:26 AM EDT | Beach Hazards Statement | BUF | 24 hr |
| Aug 28, 10:06 PM EDT | Beach Hazards Statement | BUF | 40 hr |
| Aug 29, 2:56 AM EDT | Special Weather Statement | BUF | 49 min |
| Sep 3, 7:31 PM EDT | Beach Hazards Statement | BUF | 30 hr |
| Sep 6, 9:50 PM EDT | Beach Hazards Statement | BUF | 22 hr |
| Sep 10, 3:52 AM EDT | Dense Fog Advisory | BUF | 5 hr |
| Sep 13, 3:58 AM EDT | Beach Hazards Statement | BUF | 34 hr |
| Sep 14, 3:33 AM EDT | Frost Advisory | BUF | 29 hr |
| Sep 18, 4:16 AM EDT | Freeze Warning | BUF | 28 hr |
| Sep 19, 2:09 PM EDT | Frost Advisory | BUF | 18 hr |
| Sep 20, 10:38 AM EDT | Freeze Warning | BUF | 22 hr |
| Sep 30, 4:04 AM EDT | Beach Hazards Statement | BUF | 40 hr |
| Sep 30, 9:31 PM EDT | Special Weather Statement | BUF | 44 min |
| Oct 1, 7:54 AM EDT | Special Weather Statement | BUF | 66 min |
| Oct 2, 9:09 AM EDT | Special Weather Statement | BUF | 51 min |
| Oct 6, 1:59 PM EDT | Wind Advisory | BUF | 29 hr |
| Oct 7, 11:52 AM EDT | Special Weather Statement | BUF | 38 min |
| Oct 7, 12:44 PM EDT | Special Weather Statement | BUF | 61 min |
| Oct 7, 1:02 PM EDT | Severe Thunderstorm Warning | BUF | 28 min |
| Oct 10, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Oct 10, 3:38 PM EDT | Special Weather Statement | BUF | 37 min |
| Oct 10, 4:14 PM EDT | Special Weather Statement | BUF | 31 min |
| Oct 10, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Oct 10, 4:47 PM EDT | Special Weather Statement | BUF | 43 min |
| Nov 1, 2:59 AM EST | Winter Storm Watch | BUF | 24 hr |
| Nov 1, 2:59 AM EST | Winter Weather Advisory | BUF | 31 hr |
| Nov 1, 3:10 AM EST | Lakeshore Flood Watch | BUF | 24 hr |
| Nov 2, 2:41 AM EST | Lakeshore Flood Warning | BUF | 25 hr |
| Nov 2, 2:55 AM EST | Wind Advisory | BUF | 25 hr |
| Nov 2, 3:24 AM EST | Lake Effect Snow Warning | BUF | 22 hr |
| Nov 13, 3:28 AM EST | Lakeshore Flood Watch | BUF | 24 hr |
| Nov 14, 3:31 AM EST | High Wind Warning | BUF | 45 hr |
| Nov 14, 3:34 AM EST | Lakeshore Flood Warning | BUF | 60 hr |
| Nov 15, 4:20 PM EST | Mesoscale Discussion | SPC | 85 min |
| Nov 15, 5:26 PM EST | Severe Thunderstorm Warning | BUF | 64 min |
| Nov 15, 6:04 PM EST | Severe Thunderstorm Warning | BUF | 56 min |
| Nov 15, 6:27 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Nov 22, 2:09 PM EST | Winter Weather Advisory | BUF | 10 hr |
| Nov 30, 12:32 PM EST | Winter Weather Advisory | BUF | 50 hr |
| Dec 8, 3:08 PM EST | Winter Weather Advisory | BUF | 31 hr |
| Dec 12, 3:34 AM EST | Wind Advisory | BUF | 27 hr |
| Dec 21, 2:18 PM EST | Winter Storm Watch | BUF | 3 days |
| Dec 23, 2:19 PM EST | Lake Effect Snow Warning | BUF | 4 days |
| Dec 23, 8:00 PM EST | Flood Watch | BUF | 46 hr |
| Dec 26, 5:08 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 26, 5:15 AM EST | Special Weather Statement | BUF | 90 min |
| Dec 26, 6:46 AM EST | Special Weather Statement | BUF | 89 min |
| Dec 26, 8:33 AM EST | Special Weather Statement | BUF | 102 min |
| Dec 26, 10:03 AM EST | Special Weather Statement | BUF | 102 min |
| Dec 26, 11:46 AM EST | Special Weather Statement | BUF | 3 hr |
| Dec 26, 2:42 PM EST | Special Weather Statement | BUF | 2 hr |
| Dec 26, 4:33 PM EST | Special Weather Statement | BUF | 117 min |
| Dec 28, 3:46 AM EST | Winter Weather Advisory | BUF | 34 hr |
| Dec 30, 3:25 AM EST | Winter Weather Advisory | BUF | 25 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 | 15 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 11 |
| Special Weather Statement | 46 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Ice Storm Warning | 1 |
| Lake Effect Snow Warning | 5 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 6 |
| Winter Weather Advisory | 17 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 5 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Coast and beach | |
| Lakeshore Flood Warning | 11 |
| Lakeshore Flood Watch | 10 |
| Beach Hazards Statement | 12 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.