Alert archive / New York / St. Lawrence County
Weather alerts in St. Lawrence County, New York, 2012
135 weather alerts in 2012, 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 2012. Tap one for its archive.
- Alerts
- 135
- Warnings
- 42
- Watches
- 14
- Advisories
- 31
- Busiest month
- July26 alerts
- Busiest day
- July 17, 201212 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, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 27 | 22 | 19% | 23 | 96% | 22 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Burlington, VT: tornado warnings | 4 | 1 | 75% | 1 | 100% | 13 min |
| NWS Burlington, VT: severe thunderstorm warnings | 97 | 79 | 19% | 270 | 86% | 31 min |
| NWS Burlington, VT: flash flood warnings | 5 | 3 | 40% | 13 | 92% | 97 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 1, 3:41 AM EST | Lake Effect Snow Warning | BTV | 32 hr |
| Jan 11, 2:59 AM EST | Winter Weather Advisory | BTV | 36 hr |
| Jan 12, 3:52 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 12, 11:53 AM EST | Ice Storm Warning | BTV | 3 hr |
| Jan 12, 3:35 PM EST | Winter Weather Advisory | BTV | 32 hr |
| Jan 13, 10:42 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 13, 11:54 AM EST | Winter Storm Warning | BTV | 12 hr |
| Jan 17, 3:32 AM EST | Winter Weather Advisory | BTV | 24 hr |
| Jan 17, 12:13 PM EST | High Wind Warning | BTV | 19 hr |
| Jan 17, 12:13 PM EST | Wind Advisory | BTV | 19 hr |
| Jan 26, 3:30 AM EST | Winter Weather Advisory | BTV | 33 hr |
| Jan 29, 12:04 PM EST | Winter Weather Advisory | BTV | 15 hr |
| Feb 1, 3:59 AM EST | Winter Weather Advisory | BTV | 7 hr |
| Feb 23, 9:42 AM EST | Winter Storm Watch | BTV | 5 hr |
| Feb 23, 3:00 PM EST | Winter Storm Warning | BTV | 56 hr |
| Feb 23, 3:00 PM EST | Winter Weather Advisory | BTV | 34 hr |
| Feb 28, 4:07 AM EST | Winter Storm Watch | BTV | 25 hr |
| Feb 29, 4:38 AM EST | Winter Storm Warning | BTV | 41 hr |
| Feb 29, 4:38 AM EST | Winter Weather Advisory | BTV | 41 hr |
| Mar 2, 3:15 AM EST | High Wind Watch | BTV | 12 hr |
| Mar 2, 3:18 PM EST | High Wind Warning | BTV | 30 hr |
| Mar 2, 3:18 PM EST | Wind Advisory | BTV | 30 hr |
| Mar 7, 3:32 PM EST | Wind Advisory | BTV | 20 hr |
| Apr 16, 1:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 22, 4:22 AM EDT | Wind Advisory | BTV | 31 hr |
| Apr 22, 3:37 PM EDT | Winter Weather Advisory | BTV | 15 hr |
| Apr 27, 3:56 AM EDT | Freeze Warning | BTV | 30 hr |
| Apr 28, 1:13 PM EDT | Freeze Warning | BTV | 18 hr |
| Apr 29, 7:28 AM EDT | Freeze Warning | BTV | 24 hr |
| May 3, 9:11 PM EDT | Special Weather Statement | BTV | 109 min |
| May 5, 4:03 PM EDT | Frost Advisory | BTV | 15 hr |
| May 6, 4:09 PM EDT | Frost Advisory | BTV | 15 hr |
| May 16, 1:18 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 17, 4:22 AM EDT | Freeze Warning | BTV | 27 hr |
| May 25, 3:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| May 25, 9:18 PM EDT | Mesoscale Discussion | SPC | 117 min |
| May 29, 7:07 AM EDT | Flash Flood Watch | BTV | 15 hr |
| May 29, 12:26 PM EDT | Tornado Watch | SPC | 8 hr |
| May 29, 12:57 PM EDT | Severe Thunderstorm Warning | BTV | 63 min |
| May 29, 2:39 PM EDT | Severe Thunderstorm Warning | BTV | 66 min |
| May 29, 3:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 8, 1:25 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 8, 4:25 PM EDT | Special Weather Statement | BTV | 65 min |
| Jun 8, 4:47 PM EDT | Severe Thunderstorm Warning | BTV | 58 min |
| Jun 8, 5:37 PM EDT | Severe Thunderstorm Warning | BTV | 38 min |
| Jun 8, 5:51 PM EDT | Severe Thunderstorm Warning | BTV | 54 min |
| Jun 8, 6:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 8, 6:39 PM EDT | Severe Thunderstorm Warning | BTV | 54 min |
| Jun 8, 7:25 PM EDT | Severe Thunderstorm Warning | BTV | 65 min |
| Jun 8, 8:13 PM EDT | Severe Thunderstorm Warning | BTV | 30 min |
| Jun 11, 8:29 PM EDT | Special Weather Statement | BTV | 61 min |
| Jun 11, 8:47 PM EDT | Special Weather Statement | BTV | 58 min |
| Jun 12, 7:22 PM EDT | Special Weather Statement | BTV | 53 min |
| Jun 12, 8:32 PM EDT | Special Weather Statement | BTV | 58 min |
| Jun 19, 3:41 PM EDT | Heat Advisory | BTV | 28 hr |
| Jun 23, 11:42 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 1, 7:57 PM EDT | Special Weather Statement | BTV | 63 min |
| Jul 4, 3:19 PM EDT | Special Weather Statement | BTV | 56 min |
| Jul 4, 4:00 PM EDT | Severe Thunderstorm Warning | BTV | 60 min |
| Jul 4, 4:48 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 4, 5:03 PM EDT | Severe Thunderstorm Warning | BTV | 57 min |
| Jul 17, 12:02 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 17, 1:23 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 17, 1:33 PM EDT | Severe Thunderstorm Warning | BTV | 57 min |
| Jul 17, 2:30 PM EDT | Special Weather Statement | BTV | 60 min |
| Jul 17, 3:15 PM EDT | Severe Thunderstorm Warning | BTV | 45 min |
| Jul 17, 3:32 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 17, 3:49 PM EDT | Severe Thunderstorm Warning | BTV | 41 min |
| Jul 17, 3:58 PM EDT | Severe Thunderstorm Warning | BTV | 47 min |
| Jul 17, 4:28 PM EDT | Severe Thunderstorm Warning | BTV | 62 min |
| Jul 17, 4:44 PM EDT | Severe Thunderstorm Warning | BTV | 46 min |
| Jul 17, 5:27 PM EDT | Severe Thunderstorm Warning | BTV | 48 min |
| Jul 17, 6:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 23, 12:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jul 23, 1:24 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jul 23, 4:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 23, 4:49 PM EDT | Severe Thunderstorm Warning | BTV | 56 min |
| Jul 23, 5:41 PM EDT | Severe Thunderstorm Warning | BTV | 64 min |
| Jul 23, 10:24 PM EDT | Special Weather Statement | BTV | 51 min |
| Jul 23, 10:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Jul 31, 2:40 PM EDT | Special Weather Statement | BTV | 80 min |
| Jul 31, 6:00 PM EDT | Special Weather Statement | BTV | 90 min |
| Jul 31, 8:08 PM EDT | Special Weather Statement | BTV | 82 min |
| Aug 5, 3:48 PM EDT | Special Weather Statement | BTV | 57 min |
| Aug 5, 4:21 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 5, 4:38 PM EDT | Severe Thunderstorm Warning | BTV | 67 min |
| Aug 5, 4:50 PM EDT | Special Weather Statement | BTV | 55 min |
| Aug 5, 5:29 PM EDT | Severe Thunderstorm Warning | BTV | 61 min |
| Aug 11, 12:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 11, 1:27 PM EDT | Special Weather Statement | BTV | 33 min |
| Aug 11, 1:48 PM EDT | Special Weather Statement | BTV | 42 min |
| Aug 11, 1:59 PM EDT | Severe Thunderstorm Warning | BTV | 31 min |
| Aug 11, 4:41 PM EDT | Special Weather Statement | BTV | 49 min |
| Aug 11, 5:18 PM EDT | Severe Thunderstorm Warning | BTV | 42 min |
| Aug 11, 5:58 PM EDT | Special Weather Statement | BTV | 32 min |
| Sep 6, 1:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Sep 6, 2:50 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 8, 10:03 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Sep 8, 11:04 AM EDT | Wind Advisory | BTV | 8 hr |
| Sep 8, 12:40 PM EDT | Tornado Watch | SPC | 7 hr |
| Sep 8, 1:19 PM EDT | Severe Thunderstorm Warning | BTV | 56 min |
| Sep 8, 2:14 PM EDT | Severe Thunderstorm Warning | BTV | 61 min |
| Sep 10, 3:34 PM EDT | Frost Advisory | BTV | 16 hr |
| Sep 14, 5:13 PM EDT | Special Weather Statement | BTV | 62 min |
| Sep 14, 5:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Sep 14, 5:58 PM EDT | Special Weather Statement | BTV | 62 min |
| Sep 14, 6:33 PM EDT | Severe Thunderstorm Warning | BTV | 57 min |
| Sep 14, 7:23 PM EDT | Severe Thunderstorm Warning | BTV | 39 min |
| Sep 15, 3:25 AM EDT | Frost Advisory | BTV | 25 hr |
| Sep 15, 3:25 AM EDT | Freeze Warning | BTV | 25 hr |
| Sep 18, 3:48 AM EDT | Wind Advisory | BTV | 19 hr |
| Sep 18, 2:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 18, 3:27 PM EDT | Special Weather Statement | BTV | 48 min |
| Sep 18, 4:16 PM EDT | Special Weather Statement | BTV | 59 min |
| Sep 19, 4:09 AM EDT | Frost Advisory | BTV | 28 hr |
| Sep 21, 8:26 PM EDT | Special Weather Statement | BTV | 64 min |
| Sep 22, 9:16 AM EDT | Special Weather Statement | BTV | 74 min |
| Sep 22, 10:57 AM EDT | Special Weather Statement | BTV | 63 min |
| Sep 23, 9:52 PM EDT | Frost Advisory | BTV | 9 hr |
| Oct 14, 2:27 PM EDT | Wind Advisory | BTV | 25 hr |
| Oct 27, 4:15 PM EDT | High Wind Watch | BTV | 11 hr |
| Oct 28, 3:39 AM EDT | High Wind Warning | BTV | 48 hr |
| Oct 30, 4:05 AM EDT | Wind Advisory | BTV | 12 hr |
| Nov 29, 8:19 PM EST | Winter Weather Advisory | BTV | 4 hr |
| Dec 9, 3:09 AM EST | Winter Weather Advisory | BTV | 31 hr |
| Dec 16, 3:34 AM EST | Winter Weather Advisory | BTV | 31 hr |
| Dec 17, 3:32 PM EST | Winter Weather Advisory | BTV | 18 hr |
| Dec 19, 3:15 PM EST | High Wind Watch | BTV | 21 hr |
| Dec 20, 12:06 PM EST | Wind Advisory | BTV | 27 hr |
| Dec 21, 3:17 PM EST | Winter Weather Advisory | BTV | 39 hr |
| Dec 22, 9:17 AM EST | Winter Storm Warning | BTV | 12 hr |
| Dec 25, 3:45 AM EST | Winter Storm Watch | BTV | 11 hr |
| Dec 25, 2:51 PM EST | Winter Storm Warning | BTV | 54 hr |
| Dec 26, 8:22 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 28, 2:57 PM EST | Winter Weather Advisory | BTV | 45 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 | 27 |
| Severe Thunderstorm Watch | 5 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 26 |
| Flooding | |
| Flash Flood Watch | 1 |
| Winter | |
| Ice Storm Warning | 1 |
| Lake Effect Snow Warning | 1 |
| Winter Storm Warning | 5 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 15 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 5 |
| Frost Advisory | 6 |
| Wind and dust | |
| High Wind Warning | 3 |
| High Wind Watch | 3 |
| Wind Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20112013
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.