Alert archive / New York / St. Lawrence County
Weather alerts in St. Lawrence County, New York, 2017
129 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 129
- Warnings
- 31
- Watches
- 13
- Advisories
- 32
- Busiest month
- August30 alerts
- Busiest day
- August 4, 20178 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, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 14 | 13 | 7% | 20 | 95% | 21 min |
| Flash flood warnings | 4 | 3 | 25% | 7 | 100% | 115 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Burlington, VT: severe thunderstorm warnings | 68 | 51 | 25% | 128 | 84% | 23 min |
| NWS Burlington, VT: flash flood warnings | 16 | 12 | 25% | 24 | 100% | 79 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, 2:47 PM EST | Freezing Rain Advisory | BTV | 37 hr |
| Jan 4, 3:36 AM EST | Wind Advisory | BTV | 30 hr |
| Jan 4, 4:05 AM EST | Lake Effect Snow Advisory | BTV | 42 hr |
| Jan 9, 3:23 PM EST | Wind Advisory | BTV | 44 hr |
| Jan 16, 3:31 PM EST | Winter Weather Advisory | BTV | 42 hr |
| Jan 22, 2:31 PM EST | Winter Weather Advisory | BTV | 55 hr |
| Feb 5, 8:58 PM EST | Special Weather Statement | BTV | 62 min |
| Feb 6, 3:15 PM EST | Winter Weather Advisory | BTV | 43 hr |
| Feb 9, 7:39 PM EST | Wind Chill Advisory | BTV | 14 hr |
| Feb 10, 2:25 PM EST | Winter Storm Watch | BTV | 24 hr |
| Feb 11, 2:48 PM EST | Winter Storm Warning | BTV | 49 hr |
| Feb 12, 9:59 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 12, 10:21 AM EST | Special Weather Statement | BTV | 3 hr |
| Feb 14, 3:18 PM EST | Winter Weather Advisory | BTV | 45 hr |
| Feb 23, 3:36 AM EST | Flood Watch | BTV | 3 days |
| Feb 25, 12:31 PM EST | Severe Thunderstorm Warning | BTV | 29 min |
| Feb 25, 12:58 PM EST | Severe Thunderstorm Warning | BTV | 32 min |
| Mar 1, 6:46 PM EST | Wind Advisory | BTV | 18 hr |
| Mar 3, 3:47 AM EST | Wind Chill Advisory | BTV | 27 hr |
| Mar 4, 3:09 PM EST | Wind Chill Advisory | BTV | 17 hr |
| Mar 7, 2:37 PM EST | Wind Advisory | BTV | 32 hr |
| Mar 10, 3:30 AM EST | Wind Chill Advisory | BTV | 56 hr |
| Mar 11, 3:15 PM EST | Winter Storm Watch | BTV | 36 hr |
| Mar 13, 3:49 AM EDT | Winter Storm Warning | BTV | 57 hr |
| Mar 14, 3:47 AM EDT | Blizzard Warning | BTV | 24 hr |
| Mar 15, 3:25 AM EDT | Winter Weather Advisory | BTV | 9 hr |
| Mar 30, 3:45 AM EDT | Winter Weather Advisory | BTV | 58 hr |
| Apr 4, 2:57 PM EDT | Flood Watch | BTV | 60 hr |
| May 1, 6:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 1, 6:32 PM EDT | Special Weather Statement | BTV | 58 min |
| May 1, 6:51 PM EDT | Severe Thunderstorm Warning | BTV | 54 min |
| May 1, 6:52 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 1, 7:43 PM EDT | Severe Thunderstorm Warning | BTV | 62 min |
| May 17, 2:36 PM EDT | Wind Advisory | BTV | 29 hr |
| May 18, 2:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| May 18, 3:36 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 18, 5:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 18, 8:45 PM EDT | Special Weather Statement | BTV | 45 min |
| May 18, 9:35 PM EDT | Special Weather Statement | BTV | 25 min |
| May 20, 3:50 AM EDT | Frost Advisory | BTV | 27 hr |
| May 30, 7:52 PM EDT | Special Weather Statement | BTV | 53 min |
| May 30, 8:43 PM EDT | Special Weather Statement | BTV | 62 min |
| Jun 7, 3:22 AM EDT | Dense Fog Advisory | BTV | 4 hr |
| Jun 17, 5:11 PM EDT | Special Weather Statement | BTV | 34 min |
| Jun 18, 6:13 PM EDT | Special Weather Statement | BTV | 32 min |
| Jun 21, 3:08 PM EDT | Special Weather Statement | BTV | 52 min |
| Jun 23, 9:45 AM EDT | Flash Flood Watch | BTV | 10 hr |
| Jun 23, 2:02 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 8:14 PM EDT | Special Weather Statement | BTV | 61 min |
| Jun 25, 8:57 PM EDT | Special Weather Statement | BTV | 63 min |
| Jun 26, 7:59 PM EDT | Special Weather Statement | BTV | 76 min |
| Jun 27, 10:36 AM EDT | Special Weather Statement | BTV | 24 min |
| Jun 27, 2:25 PM EDT | Special Weather Statement | BTV | 35 min |
| Jun 29, 9:10 PM EDT | Flash Flood Warning | BTV | 4 hr |
| Jun 30, 3:34 AM EDT | Flash Flood Watch | BTV | 47 hr |
| Jul 2, 9:54 PM EDT | Special Weather Statement | BTV | 51 min |
| Jul 2, 10:46 PM EDT | Special Weather Statement | BTV | 59 min |
| Jul 8, 3:48 AM EDT | Special Weather Statement | BTV | 57 min |
| Jul 8, 4:37 AM EDT | Severe Thunderstorm Warning | BTV | 53 min |
| Jul 8, 5:31 AM EDT | Severe Thunderstorm Warning | BTV | 59 min |
| Jul 8, 5:37 AM EDT | Special Weather Statement | BUF | 23 min |
| Jul 8, 5:46 AM EDT | Special Weather Statement | BTV | 59 min |
| Jul 17, 3:54 PM EDT | Special Weather Statement | BTV | 66 min |
| Jul 19, 8:48 PM EDT | Special Weather Statement | BTV | 57 min |
| Jul 24, 5:02 AM EDT | Special Weather Statement | BTV | 3 hr |
| Jul 24, 5:19 AM EDT | Flash Flood Warning | BTV | 4 hr |
| Jul 24, 9:14 AM EDT | Flash Flood Warning | BTV | 3 hr |
| Jul 24, 12:08 PM EDT | Areal Flood Warning | BTV | 3 hr |
| Jul 27, 3:52 PM EDT | Special Weather Statement | BTV | 53 min |
| Jul 27, 4:45 PM EDT | Special Weather Statement | BTV | 60 min |
| Aug 2, 1:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 2:53 PM EDT | Special Weather Statement | BTV | 37 min |
| Aug 3, 3:31 PM EDT | Special Weather Statement | BTV | 44 min |
| Aug 3, 4:32 PM EDT | Flash Flood Warning | BTV | 4 hr |
| Aug 3, 4:58 PM EDT | Special Weather Statement | BTV | 47 min |
| Aug 4, 12:13 PM EDT | Special Weather Statement | BTV | 62 min |
| Aug 4, 12:32 PM EDT | Severe Thunderstorm Warning | BTV | 58 min |
| Aug 4, 3:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 4, 4:00 PM EDT | Special Weather Statement | BTV | 60 min |
| Aug 4, 4:27 PM EDT | Severe Thunderstorm Warning | BTV | 37 min |
| Aug 4, 6:28 PM EDT | Special Weather Statement | BTV | 47 min |
| Aug 4, 6:50 PM EDT | Special Weather Statement | BTV | 40 min |
| Aug 4, 7:29 PM EDT | Severe Thunderstorm Warning | BTV | 61 min |
| Aug 4, 8:08 PM EDT | Severe Thunderstorm Warning | BTV | 67 min |
| Aug 7, 6:11 PM EDT | Special Weather Statement | BTV | 64 min |
| Aug 7, 6:31 PM EDT | Areal Flood Warning | BTV | 3 hr |
| Aug 12, 12:38 AM EDT | Special Weather Statement | BTV | 67 min |
| Aug 12, 1:46 AM EDT | Special Weather Statement | BTV | 59 min |
| Aug 12, 7:54 PM EDT | Special Weather Statement | BTV | 66 min |
| Aug 15, 1:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 15, 4:32 PM EDT | Special Weather Statement | BTV | 43 min |
| Aug 15, 5:15 PM EDT | Special Weather Statement | BTV | 60 min |
| Aug 22, 11:55 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 22, 12:23 PM EDT | Tornado Watch | SPC | 9 hr |
| Aug 22, 1:16 PM EDT | Special Weather Statement | BTV | 59 min |
| Aug 22, 1:45 PM EDT | Severe Thunderstorm Warning | BTV | 60 min |
| Aug 22, 2:39 PM EDT | Severe Thunderstorm Warning | BTV | 66 min |
| Aug 22, 2:43 PM EDT | Severe Thunderstorm Warning | BTV | 62 min |
| Aug 22, 3:42 PM EDT | Severe Thunderstorm Warning | BTV | 63 min |
| Aug 22, 4:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Sep 1, 3:39 AM EDT | Frost Advisory | BTV | 27 hr |
| Sep 30, 2:53 AM EDT | Frost Advisory | BTV | 29 hr |
| Oct 1, 3:53 PM EDT | Frost Advisory | BTV | 16 hr |
| Oct 11, 3:07 PM EDT | Frost Advisory | BTV | 16 hr |
| Oct 12, 2:47 PM EDT | Frost Advisory | BTV | 16 hr |
| Oct 14, 3:55 PM EDT | Wind Advisory | BTV | 30 hr |
| Oct 15, 3:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Oct 15, 5:07 PM EDT | Special Weather Statement | BTV | 53 min |
| Oct 28, 4:20 AM EDT | Flash Flood Watch | BTV | 47 hr |
| Oct 29, 12:34 PM EDT | Wind Advisory | BTV | 27 hr |
| Oct 30, 7:08 AM EDT | High Wind Warning | BTV | 9 hr |
| Nov 1, 9:48 PM EDT | River Flood Warning | BTV | 70 hr |
| Nov 4, 3:34 PM EDT | Flood Watch | BTV | 37 hr |
| Dec 6, 3:59 AM EST | Winter Weather Advisory | BTV | 11 hr |
| Dec 6, 3:16 PM EST | Lake Effect Snow Warning | BTV | 43 hr |
| Dec 7, 4:39 PM EST | Special Weather Statement | BTV | 36 min |
| Dec 7, 5:14 PM EST | Special Weather Statement | BTV | 61 min |
| Dec 10, 2:58 PM EST | Winter Storm Watch | BTV | 13 hr |
| Dec 11, 3:45 AM EST | Winter Storm Warning | BTV | 56 hr |
| Dec 11, 3:45 AM EST | Winter Weather Advisory | BTV | 56 hr |
| Dec 21, 3:08 AM EST | Winter Weather Advisory | BTV | 66 hr |
| Dec 22, 3:32 AM EST | Winter Storm Warning | BTV | 23 hr |
| Dec 23, 3:35 PM EST | Winter Storm Watch | BTV | 11 hr |
| Dec 24, 2:52 AM EST | Winter Storm Warning | BTV | 33 hr |
| Dec 25, 8:16 AM EST | Winter Weather Advisory | BTV | 117 min |
| Dec 26, 3:04 AM EST | Wind Chill Advisory | BTV | 3 days |
| Dec 27, 3:44 AM EST | Wind Chill Warning | BTV | 48 hr |
| Dec 30, 3:45 AM EST | Wind Chill Advisory | BTV | 56 hr |
| Dec 30, 2:57 PM EST | Wind Chill Warning | BTV | 45 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 archive20162018
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.