Alert archive / New York / Lewis County
Weather alerts in Lewis County, New York, 2020
136 weather alerts in 2020, 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 2020. Tap one for its archive.
- Alerts
- 136
- Warnings
- 29
- Watches
- 11
- Advisories
- 31
- Busiest month
- January17 alerts
- Busiest day
- December 26, 20206 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 Lewis County in 2020 had a tornado report inside them.
Lewis 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 | 13 | 8 | 38% | 10 | 80% | 32 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, 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, 4:45 AM EST | Special Weather Statement | BUF | 60 min |
| Jan 8, 6:37 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 8, 9:27 AM EST | Special Weather Statement | BUF | 63 min |
| Jan 9, 2:17 PM EST | Winter Weather Advisory | BUF | 22 hr |
| Jan 9, 2:22 PM EST | Flood Watch | BUF | 70 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, 1:38 PM EST | Winter Storm Warning | BUF | 46 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 9, 2:42 PM EST | Winter Weather Advisory | BUF | 19 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, 4:21 AM EST | Winter Storm Watch | BUF | 24 hr |
| Feb 26, 4:27 AM EST | Lake Effect Snow Warning | BUF | 9 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, 8:15 PM EST | Special Weather Statement | BUF | 45 min |
| Mar 12, 2:11 PM EDT | Wind Advisory | BUF | 29 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 20, 2:36 PM EDT | Special Weather Statement | BUF | 39 min |
| Mar 20, 2:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Mar 22, 1:37 PM EDT | Winter Weather Advisory | BUF | 30 hr |
| Apr 9, 2:01 AM EDT | Wind Advisory | BUF | 38 hr |
| Apr 9, 4:34 AM EDT | Winter Weather Advisory | BUF | 33 hr |
| Apr 11, 4:57 AM EDT | High Wind Watch | BUF | 33 hr |
| Apr 11, 4:57 AM EDT | High Wind Warning | BUF | 64 hr |
| Apr 13, 2:42 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 13, 3:54 PM EDT | Special Weather Statement | BUF | 51 min |
| Apr 29, 3:43 AM EDT | Wind Advisory | BUF | 42 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 15, 2:59 PM EDT | Mesoscale Discussion | SPC | 91 min |
| May 15, 3:48 PM EDT | Special Weather Statement | ALY | 27 min |
| May 15, 3:53 PM EDT | Special Weather Statement | BUF | 37 min |
| May 26, 2:42 PM EDT | Special Weather Statement | BUF | 48 min |
| May 29, 11:03 AM EDT | Special Weather Statement | BUF | 27 min |
| May 29, 2:13 PM EDT | Special Weather Statement | BUF | 32 min |
| May 29, 3:23 PM EDT | Severe Thunderstorm Warning | BUF | 47 min |
| May 29, 4:20 PM EDT | Special Weather Statement | BUF | 25 min |
| May 29, 4:40 PM EDT | Special Weather Statement | BUF | 50 min |
| Jun 3, 7:01 PM EDT | Severe Thunderstorm Warning | BUF | 44 min |
| Jun 6, 12:08 AM EDT | Special Weather Statement | BUF | 37 min |
| Jun 6, 3:59 PM EDT | Special Weather Statement | BUF | 76 min |
| Jun 6, 4:30 PM EDT | Special Weather Statement | BUF | 45 min |
| Jun 6, 4:44 PM EDT | Special Weather Statement | BUF | 46 min |
| Jun 10, 11:03 AM EDT | Special Weather Statement | BUF | 42 min |
| Jun 11, 2:26 AM EDT | Special Weather Statement | BUF | 64 min |
| Jun 20, 6:01 PM EDT | Special Weather Statement | ALY | 29 min |
| Jun 20, 9:35 PM EDT | Special Weather Statement | BUF | 55 min |
| Jun 22, 10:33 AM EDT | Heat Advisory | BUF | 8 hr |
| Jun 22, 1:14 PM EDT | Special Weather Statement | BUF | 46 min |
| Jun 28, 4:29 PM EDT | Special Weather Statement | BUF | 46 min |
| Jun 28, 6:24 PM EDT | Special Weather Statement | BUF | 51 min |
| Jul 2, 7:27 PM EDT | Special Weather Statement | BUF | 33 min |
| Jul 7, 4:44 PM EDT | Special Weather Statement | BUF | 31 min |
| Jul 11, 2:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Jul 11, 4:23 PM EDT | Severe Thunderstorm Warning | BUF | 67 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, 2:22 PM EDT | Special Weather Statement | BUF | 53 min |
| Jul 13, 3:46 PM EDT | Special Weather Statement | BUF | 59 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 14, 5:17 PM EDT | Special Weather Statement | BUF | 58 min |
| Jul 19, 12:53 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 19, 5:54 PM EDT | Special Weather Statement | BUF | 51 min |
| Jul 19, 6:03 PM EDT | Severe Thunderstorm Warning | BUF | 57 min |
| Jul 28, 1:33 AM EDT | Special Weather Statement | BUF | 42 min |
| Aug 2, 2:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 2:17 PM EDT | Special Weather Statement | BUF | 43 min |
| Aug 2, 2:35 PM EDT | Severe Thunderstorm Warning | BUF | 55 min |
| Aug 2, 3:10 PM EDT | Tornado Watch | SPC | 7 hr |
| Aug 2, 3:23 PM EDT | Special Weather Statement | BUF | 22 min |
| Aug 18, 9:39 AM EDT | Special Weather Statement | BUF | 51 min |
| Aug 21, 2:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 25, 12:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 29, 10:05 AM EDT | Special Weather Statement | BUF | 55 min |
| Aug 29, 4:20 PM EDT | Special Weather Statement | BUF | 40 min |
| Sep 2, 8:42 PM EDT | Special Weather Statement | BUF | 48 min |
| Sep 14, 3:33 AM EDT | Frost Advisory | BUF | 29 hr |
| Sep 17, 3:59 PM EDT | Frost Advisory | BUF | 16 hr |
| Sep 18, 4:16 AM EDT | Freeze Warning | BUF | 28 hr |
| Sep 29, 6:21 AM EDT | Special Weather Statement | BUF | 54 min |
| Oct 6, 1:59 PM EDT | Wind Advisory | BUF | 29 hr |
| 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 7, 1:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 10, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 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, 4:55 PM EDT | Special Weather Statement | BUF | 35 min |
| Oct 10, 6:44 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| 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, 10:04 PM EST | Special Weather Statement | BUF | 71 min |
| Nov 2, 3:24 AM EST | Lake Effect Snow Warning | BUF | 22 hr |
| Nov 2, 5:03 PM EST | Special Weather Statement | BUF | 102 min |
| Nov 2, 7:03 PM EST | Special Weather Statement | BUF | 117 min |
| Nov 14, 3:31 AM EST | High Wind Warning | BUF | 45 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 15, 6:55 PM EST | Severe Thunderstorm Warning | BUF | 22 min |
| 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 14, 3:26 PM EST | Special Weather Statement | BUF | 79 min |
| 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, 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 26, 6:34 PM EST | Special Weather Statement | BUF | 116 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 | 13 |
| Tornado Warning | 1 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 14 |
| Special Weather Statement | 51 |
| Flooding | |
| Flood Watch | 2 |
| Winter | |
| Blizzard Warning | 1 |
| Lake Effect Snow Warning | 5 |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 18 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 1 |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
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.