Alert archive / New York / St. Lawrence County
Weather alerts in St. Lawrence County, New York, 2011
133 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 133
- Warnings
- 33
- Watches
- 20
- Advisories
- 41
- Busiest month
- July24 alerts
- Busiest day
- May 26, 20119 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, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 16 | 11 | 31% | 17 | 94% | 25 min |
| Flash flood warnings | 2 | 1 | 50% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Burlington, VT: tornado warnings | 5 | 0 | 100% | 0 | ||
| NWS Burlington, VT: severe thunderstorm warnings | 103 | 67 | 35% | 243 | 82% | 26 min |
| NWS Burlington, VT: flash flood warnings | 29 | 19 | 34% | 101 | 88% | 178 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 7, 3:35 AM EST | Winter Weather Advisory | BTV | 32 hr |
| Jan 8, 3:27 PM EST | Winter Weather Advisory | BTV | 36 hr |
| Jan 12, 2:00 PM EST | Winter Weather Advisory | BTV | 11 hr |
| Jan 23, 9:22 AM EST | Wind Chill Advisory | BTV | 10 hr |
| Jan 31, 3:26 AM EST | Winter Storm Watch | BTV | 12 hr |
| Jan 31, 3:39 PM EST | Winter Storm Warning | BTV | 57 hr |
| Feb 2, 2:57 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 5, 3:56 AM EST | Winter Storm Warning | BTV | 25 hr |
| Feb 5, 3:56 AM EST | Winter Weather Advisory | BTV | 24 hr |
| Feb 5, 4:45 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 7, 2:31 AM EST | Winter Weather Advisory | BTV | 32 hr |
| Feb 9, 5:22 PM EST | Lake Effect Snow Warning | BTV | 5 hr |
| Feb 14, 3:23 PM EST | Wind Chill Advisory | BTV | 12 hr |
| Feb 18, 9:23 AM EST | Wind Advisory | BTV | 19 hr |
| Feb 18, 9:10 PM EST | Special Weather Statement | BTV | 110 min |
| Feb 23, 3:53 PM EST | Winter Storm Watch | BTV | 12 hr |
| Feb 24, 3:31 AM EST | Winter Storm Warning | BTV | 41 hr |
| Feb 24, 3:31 AM EST | Winter Weather Advisory | BTV | 39 hr |
| Feb 27, 2:19 PM EST | Winter Weather Advisory | BTV | 23 hr |
| Mar 5, 3:32 AM EST | Winter Storm Watch | BTV | 11 hr |
| Mar 5, 2:15 PM EST | Winter Storm Warning | BTV | 50 hr |
| Mar 9, 2:15 PM EST | Winter Weather Advisory | BTV | 25 hr |
| Mar 10, 1:26 PM EST | Flood Watch | BTV | 45 hr |
| Mar 10, 1:49 PM EST | Wind Advisory | BTV | 19 hr |
| Mar 20, 3:26 PM EDT | Winter Weather Advisory | BTV | 24 hr |
| Mar 30, 3:58 AM EDT | Winter Storm Watch | BTV | 24 hr |
| Mar 31, 3:47 AM EDT | Winter Weather Advisory | BTV | 24 hr |
| Apr 11, 2:59 AM EDT | Flood Watch | BTV | 28 hr |
| Apr 11, 6:25 AM EDT | Severe Thunderstorm Warning | BTV | 50 min |
| Apr 15, 3:31 PM EDT | Wind Advisory | BTV | 36 hr |
| Apr 17, 4:31 AM EDT | Wind Advisory | BTV | 15 hr |
| Apr 21, 12:02 PM EDT | Areal Flood Advisory | BTV | 4 days |
| Apr 25, 3:48 AM EDT | Flood Watch | BTV | 35 hr |
| Apr 25, 11:30 AM EDT | Areal Flood Advisory | BTV | 3 days |
| Apr 26, 3:43 PM EDT | Severe Thunderstorm Warning | BTV | 47 min |
| Apr 26, 7:07 PM EDT | Special Weather Statement | BTV | 53 min |
| Apr 27, 3:31 AM EDT | River Flood Warning | BTV | 18 hr |
| Apr 27, 5:47 PM EDT | Flash Flood Watch | BTV | 26 hr |
| Apr 27, 8:15 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 28, 10:12 AM EDT | High Wind Warning | BTV | 9 hr |
| Apr 28, 11:38 AM EDT | Areal Flood Warning | BTV | 24 hr |
| Apr 28, 12:04 PM EDT | River Flood Warning | BTV | 21 hr |
| Apr 28, 12:42 PM EDT | Severe Thunderstorm Warning | BTV | 63 min |
| Apr 29, 10:54 AM EDT | River Flood Warning | BTV | 9 days |
| Apr 29, 10:54 AM EDT | River Flood Warning | BTV | 10 days |
| May 2, 3:20 PM EDT | Flood Watch | BTV | 48 hr |
| May 3, 12:57 PM EDT | Areal Flood Advisory | BTV | 8 hr |
| May 3, 9:38 PM EDT | Areal Flood Advisory | BTV | 12 hr |
| May 9, 9:49 AM EDT | Areal Flood Advisory | BTV | 72 hr |
| May 12, 9:51 AM EDT | Areal Flood Advisory | BTV | 24 hr |
| May 13, 2:17 PM EDT | Areal Flood Advisory | BTV | 4 days |
| May 14, 4:03 AM EDT | Flood Watch | BTV | 3 days |
| May 17, 3:22 PM EDT | Areal Flood Advisory | BTV | 6 days |
| May 19, 6:18 PM EDT | Special Weather Statement | BTV | 57 min |
| May 20, 3:53 PM EDT | Flash Flood Warning | BTV | 6 hr |
| May 20, 7:50 PM EDT | Areal Flood Advisory | BTV | 5 hr |
| May 26, 10:05 AM EDT | Flash Flood Watch | BTV | 42 hr |
| May 26, 10:15 AM EDT | Special Weather Statement | BTV | 60 min |
| May 26, 10:55 AM EDT | Special Weather Statement | BTV | 65 min |
| May 26, 11:11 AM EDT | Severe Thunderstorm Warning | BTV | 64 min |
| May 26, 12:07 PM EDT | Severe Thunderstorm Warning | BTV | 53 min |
| May 26, 12:29 PM EDT | Tornado Watch | SPC | 8 hr |
| May 26, 3:37 PM EDT | Severe Thunderstorm Warning | BTV | 53 min |
| May 26, 4:15 PM EDT | Areal Flood Advisory | BTV | 6 hr |
| May 26, 4:34 PM EDT | Severe Thunderstorm Warning | BTV | 56 min |
| May 26, 10:28 PM EDT | Flash Flood Warning | BTV | 6 hr |
| May 27, 11:37 PM EDT | Special Weather Statement | BTV | 83 min |
| May 28, 4:14 AM EDT | Flash Flood Watch | BTV | 18 hr |
| Jun 1, 4:50 AM EDT | Wind Advisory | BTV | 17 hr |
| Jun 1, 5:03 AM EDT | Severe Thunderstorm Warning | BTV | 65 min |
| Jun 3, 3:44 PM EDT | Frost Advisory | BTV | 15 hr |
| Jun 8, 3:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 8, 4:15 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 8, 4:46 PM EDT | Severe Thunderstorm Warning | BTV | 89 min |
| Jun 8, 6:02 PM EDT | Severe Thunderstorm Warning | BTV | 58 min |
| Jun 8, 9:28 PM EDT | Severe Thunderstorm Warning | BTV | 62 min |
| Jun 9, 4:41 PM EDT | Severe Thunderstorm Warning | BTV | 64 min |
| Jun 23, 5:54 PM EDT | Special Weather Statement | BTV | 66 min |
| Jun 24, 11:42 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 24, 4:18 PM EDT | Special Weather Statement | BTV | 57 min |
| Jun 24, 5:24 PM EDT | Special Weather Statement | BTV | 96 min |
| Jun 28, 1:19 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 28, 8:11 PM EDT | Special Weather Statement | BTV | 64 min |
| Jul 3, 5:26 PM EDT | Special Weather Statement | BTV | 64 min |
| Jul 6, 1:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 6, 7:38 PM EDT | Special Weather Statement | BTV | 52 min |
| Jul 6, 8:30 PM EDT | Special Weather Statement | BTV | 60 min |
| Jul 12, 3:25 PM EDT | Special Weather Statement | BTV | 65 min |
| Jul 12, 4:27 PM EDT | Special Weather Statement | BTV | 93 min |
| Jul 13, 1:47 PM EDT | Special Weather Statement | BTV | 58 min |
| Jul 17, 7:12 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Jul 17, 7:41 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 17, 7:59 PM EDT | Special Weather Statement | BTV | 61 min |
| Jul 17, 8:11 PM EDT | Severe Thunderstorm Warning | BTV | 50 min |
| Jul 17, 8:44 PM EDT | Severe Thunderstorm Warning | BTV | 61 min |
| Jul 17, 8:51 PM EDT | Special Weather Statement | BTV | 54 min |
| Jul 17, 9:10 PM EDT | Severe Thunderstorm Warning | BTV | 50 min |
| Jul 17, 10:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jul 18, 3:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 18, 8:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 18, 8:17 PM EDT | Special Weather Statement | BTV | 58 min |
| Jul 20, 7:47 PM EDT | Heat Advisory | BTV | 23 hr |
| Jul 26, 11:05 AM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 26, 11:28 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 26, 1:41 PM EDT | Special Weather Statement | BTV | 64 min |
| Jul 26, 2:16 PM EDT | Severe Thunderstorm Warning | BTV | 59 min |
| Jul 26, 3:39 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 10, 5:11 PM EDT | Special Weather Statement | BTV | 64 min |
| Aug 14, 2:52 PM EDT | Areal Flood Advisory | BTV | 6 hr |
| Aug 14, 5:31 PM EDT | Areal Flood Advisory | BTV | 4 hr |
| Aug 14, 8:20 PM EDT | Areal Flood Advisory | BTV | 6 hr |
| Aug 18, 5:05 PM EDT | Special Weather Statement | BTV | 55 min |
| Aug 18, 5:52 PM EDT | Special Weather Statement | BTV | 53 min |
| Aug 21, 2:13 PM EDT | Special Weather Statement | BTV | 62 min |
| Aug 25, 12:37 AM EDT | Special Weather Statement | BTV | 53 min |
| Aug 26, 3:46 PM EDT | Flash Flood Watch | BTV | 54 hr |
| Aug 27, 3:40 PM EDT | Wind Advisory | BTV | 30 hr |
| Sep 3, 4:12 AM EDT | Flash Flood Watch | BTV | 72 hr |
| Sep 4, 2:43 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Sep 4, 6:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Sep 13, 2:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Sep 15, 2:58 PM EDT | Freeze Warning | BTV | 13 hr |
| Sep 16, 4:03 AM EDT | Frost Advisory | BTV | 27 hr |
| Sep 16, 4:03 AM EDT | Freeze Warning | BTV | 27 hr |
| Sep 17, 7:28 AM EDT | Frost Advisory | BTV | 20 hr |
| Sep 17, 7:28 AM EDT | Freeze Warning | BTV | 20 hr |
| Oct 5, 4:34 AM EDT | Freeze Warning | BTV | 27 hr |
| Oct 14, 3:37 PM EDT | Wind Advisory | BTV | 31 hr |
| Nov 22, 3:56 AM EST | Winter Weather Advisory | BTV | 33 hr |
| Dec 8, 3:48 PM EST | Lake Effect Snow Advisory | BTV | 23 hr |
| Dec 28, 12:14 PM EST | Wind Chill Advisory | BTV | 16 hr |
| Dec 28, 2:13 PM EST | Winter Weather Advisory | BTV | 7 hr |
| Dec 30, 4:16 AM EST | Winter Weather Advisory | BTV | 33 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 archive20102012
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.