Alert archive / New York / St. Lawrence County
Weather alerts in St. Lawrence County, New York, 2020
100 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
St. Lawrence County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 100
- Warnings
- 24
- Watches
- 8
- Advisories
- 24
- Busiest month
- July18 alerts
- Busiest day
- August 2, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
St. Lawrence County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 8 | 38% | 20 | 70% | 13 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Burlington, VT: tornado warnings | 2 | 0 | 100% | 0 | ||
| NWS Burlington, VT: severe thunderstorm warnings | 71 | 48 | 32% | 101 | 80% | 19 min |
| NWS Burlington, VT: flash flood warnings | 9 | 4 | 56% | 7 | 86% | 74 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 4, 3:34 AM EST | Winter Weather Advisory | BTV | 24 hr |
| Jan 9, 4:10 PM EST | Flood Watch | BTV | 71 hr |
| Jan 10, 3:01 AM EST | Winter Storm Watch | BTV | 13 hr |
| Jan 10, 3:38 PM EST | Ice Storm Warning | BTV | 43 hr |
| Jan 10, 3:38 PM EST | Winter Weather Advisory | BTV | 43 hr |
| Jan 12, 2:32 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 14, 3:00 PM EST | Winter Storm Watch | BTV | 13 hr |
| Jan 15, 3:44 AM EST | Winter Storm Warning | BTV | 39 hr |
| Jan 15, 3:44 AM EST | Winter Weather Advisory | BTV | 39 hr |
| Jan 15, 3:09 PM EST | Wind Chill Advisory | BTV | 43 hr |
| Jan 17, 2:51 PM EST | Winter Weather Advisory | BTV | 46 hr |
| Jan 24, 2:19 PM EST | Winter Weather Advisory | BTV | 38 hr |
| Feb 5, 3:21 AM EST | Winter Storm Watch | BTV | 12 hr |
| Feb 5, 3:27 PM EST | Winter Storm Warning | BTV | 54 hr |
| Feb 12, 3:03 AM EST | Winter Weather Advisory | BTV | 34 hr |
| Feb 13, 2:25 PM EST | Wind Chill Advisory | BTV | 19 hr |
| Feb 26, 3:23 AM EST | Winter Weather Advisory | BTV | 70 hr |
| Feb 27, 3:40 AM EST | Lake Effect Snow Warning | BTV | 45 hr |
| Mar 19, 3:54 PM EDT | Wind Advisory | BTV | 30 hr |
| Mar 20, 1:58 PM EDT | Special Weather Statement | BTV | 62 min |
| Mar 20, 2:28 PM EDT | Severe Thunderstorm Warning | BTV | 47 min |
| Mar 20, 2:32 PM EDT | Severe Thunderstorm Warning | BTV | 43 min |
| Mar 20, 2:47 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Mar 29, 5:22 PM EDT | Severe Thunderstorm Warning | BTV | 53 min |
| Apr 9, 3:53 AM EDT | Winter Weather Advisory | BTV | 33 hr |
| Apr 11, 3:45 PM EDT | High Wind Watch | BTV | 12 hr |
| Apr 12, 3:15 AM EDT | High Wind Warning | BTV | 46 hr |
| Apr 12, 4:25 PM EDT | Wind Advisory | BTV | 33 hr |
| May 11, 3:14 AM EDT | Freeze Warning | BTV | 25 hr |
| May 12, 12:58 PM EDT | Freeze Warning | BTV | 18 hr |
| May 13, 1:34 PM EDT | Freeze Warning | BTV | 17 hr |
| May 27, 4:21 PM EDT | Severe Thunderstorm Warning | BTV | 39 min |
| May 27, 4:48 PM EDT | Severe Thunderstorm Warning | BTV | 31 min |
| May 27, 5:00 PM EDT | Severe Thunderstorm Warning | BTV | 30 min |
| May 29, 3:24 PM EDT | Special Weather Statement | BTV | 66 min |
| May 29, 4:44 PM EDT | Special Weather Statement | BTV | 61 min |
| Jun 6, 3:08 PM EDT | Special Weather Statement | BTV | 67 min |
| Jun 6, 3:45 PM EDT | Special Weather Statement | BTV | 45 min |
| Jun 20, 7:33 PM EDT | Special Weather Statement | BTV | 42 min |
| Jun 27, 4:31 PM EDT | Special Weather Statement | BTV | 59 min |
| Jun 27, 5:25 PM EDT | Special Weather Statement | BTV | 65 min |
| Jun 27, 6:16 PM EDT | Special Weather Statement | BTV | 59 min |
| Jun 27, 6:35 PM EDT | Severe Thunderstorm Warning | BTV | 40 min |
| Jun 28, 8:22 PM EDT | Special Weather Statement | BTV | 53 min |
| Jun 28, 8:47 PM EDT | Severe Thunderstorm Warning | BTV | 58 min |
| Jul 2, 6:39 PM EDT | Special Weather Statement | BTV | 51 min |
| Jul 7, 4:25 PM EDT | Special Weather Statement | BTV | 50 min |
| Jul 7, 4:52 PM EDT | Severe Thunderstorm Warning | BTV | 38 min |
| Jul 7, 5:14 PM EDT | Special Weather Statement | BTV | 61 min |
| Jul 8, 3:23 AM EDT | Heat Advisory | BTV | 63 hr |
| Jul 11, 5:52 PM EDT | Special Weather Statement | BTV | 23 min |
| Jul 11, 6:15 PM EDT | Special Weather Statement | BTV | 30 min |
| Jul 12, 2:13 AM EDT | Flash Flood Warning | BTV | 4 hr |
| Jul 13, 5:57 PM EDT | Special Weather Statement | BTV | 63 min |
| Jul 13, 6:00 PM EDT | Special Weather Statement | BTV | 60 min |
| Jul 18, 3:17 AM EDT | Heat Advisory | BTV | 40 hr |
| Jul 19, 5:36 PM EDT | Special Weather Statement | BTV | 54 min |
| Jul 19, 6:03 PM EDT | Severe Thunderstorm Warning | BTV | 57 min |
| Jul 19, 6:56 PM EDT | Severe Thunderstorm Warning | BTV | 64 min |
| Jul 27, 4:19 PM EDT | Special Weather Statement | BTV | 41 min |
| Jul 27, 4:47 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 27, 5:08 PM EDT | Special Weather Statement | BTV | 52 min |
| Jul 30, 2:50 PM EDT | Special Weather Statement | BTV | 40 min |
| Aug 2, 2:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 3:10 PM EDT | Tornado Watch | SPC | 7 hr |
| Aug 2, 3:19 PM EDT | Special Weather Statement | BTV | 41 min |
| Aug 2, 3:52 PM EDT | Severe Thunderstorm Warning | BTV | 38 min |
| Aug 2, 4:38 PM EDT | Special Weather Statement | BTV | 37 min |
| Aug 2, 6:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 7:32 PM EDT | Special Weather Statement | BTV | 43 min |
| Aug 5, 6:06 AM EDT | Special Weather Statement | BTV | 24 min |
| Aug 5, 6:29 AM EDT | Special Weather Statement | BTV | 61 min |
| Aug 10, 3:04 PM EDT | Heat Advisory | BTV | 28 hr |
| Aug 23, 10:21 PM EDT | Special Weather Statement | BTV | 54 min |
| Aug 23, 11:11 PM EDT | Special Weather Statement | BTV | 64 min |
| Aug 24, 2:01 PM EDT | Special Weather Statement | BTV | 59 min |
| Aug 25, 12:48 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 29, 2:59 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 29, 5:49 PM EDT | Special Weather Statement | BTV | 56 min |
| Sep 14, 2:59 AM EDT | Frost Advisory | BTV | 30 hr |
| Sep 17, 2:51 PM EDT | Frost Advisory | BTV | 17 hr |
| Sep 18, 3:54 PM EDT | Freeze Warning | BTV | 16 hr |
| Oct 7, 11:28 AM EDT | Special Weather Statement | BTV | 47 min |
| Oct 7, 11:55 AM EDT | Special Weather Statement | BTV | 50 min |
| Oct 10, 1:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Oct 10, 2:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Oct 10, 4:06 PM EDT | Special Weather Statement | BTV | 54 min |
| Oct 10, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Oct 14, 5:36 AM EDT | Wind Advisory | BTV | 35 hr |
| Nov 1, 2:55 PM EST | Winter Weather Advisory | BTV | 39 hr |
| Nov 15, 3:18 AM EST | Wind Advisory | BTV | 23 hr |
| Nov 15, 5:50 PM EST | Severe Thunderstorm Warning | BTV | 70 min |
| Nov 15, 6:27 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Nov 15, 7:02 PM EST | Special Weather Statement | BTV | 88 min |
| Nov 22, 2:38 PM EST | Winter Weather Advisory | BTV | 10 hr |
| Dec 23, 2:53 PM EST | Wind Advisory | BTV | 25 hr |
| Dec 24, 3:43 PM EST | Wind Advisory | BTV | 18 hr |
| Dec 25, 3:46 PM EST | Winter Weather Advisory | BTV | 31 hr |
| Dec 26, 6:05 AM EST | Special Weather Statement | BTV | 40 min |
| Dec 26, 2:04 PM EST | Winter Storm Warning | BTV | 8 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
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.