Alert archive / New Hampshire / Belknap County
Weather alerts in Belknap County, New Hampshire, 2012
103 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Belknap County and its neighbors
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 103
- Warnings
- 29
- Watches
- 16
- Advisories
- 31
- Busiest month
- July19 alerts
- Busiest day
- May 29, 20127 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Belknap County, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 20 | 15 | 25% | 25 | 84% | 24 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2012
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gray, ME: tornado warnings | 0 | 1 | 0% | |||
| NWS Gray, ME: severe thunderstorm warnings | 86 | 60 | 30% | 153 | 86% | 21 min |
| NWS Gray, ME: flash flood warnings | 15 | 1 | 93% | 9 | 11% | 29 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 |
|---|---|---|---|
| Dec 31, 8:32 PM EST | Dense Fog Advisory | GYX | 4 hr |
| Jan 10, 3:04 PM EST | Winter Storm Watch | GYX | 24 hr |
| Jan 11, 3:32 PM EST | Winter Storm Warning | GYX | 28 hr |
| Jan 11, 3:32 PM EST | Winter Weather Advisory | GYX | 28 hr |
| Jan 12, 11:19 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 13, 3:19 AM EST | Freezing Rain Advisory | GYX | 10 hr |
| Jan 17, 3:15 PM EST | Wind Advisory | GYX | 21 hr |
| Jan 22, 3:24 PM EST | Winter Weather Advisory | GYX | 18 hr |
| Jan 23, 3:42 AM EST | Winter Weather Advisory | GYX | 22 hr |
| Jan 26, 2:57 AM EST | Winter Weather Advisory | GYX | 35 hr |
| Jan 31, 2:03 AM EST | Winter Weather Advisory | GYX | 36 hr |
| Feb 23, 3:15 PM EST | Winter Weather Advisory | GYX | 39 hr |
| Feb 24, 3:46 AM EST | Winter Weather Advisory | GYX | 21 hr |
| Feb 25, 3:33 AM EST | Wind Advisory | GYX | 12 hr |
| Feb 28, 3:56 PM EST | Winter Storm Watch | GYX | 23 hr |
| Feb 29, 4:29 AM EST | Winter Storm Warning | GYX | 41 hr |
| Mar 2, 2:26 PM EST | Winter Weather Advisory | GYX | 20 hr |
| Apr 22, 3:20 AM EDT | Flood Watch | GYX | 39 hr |
| May 16, 6:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 16, 7:48 PM EDT | Special Weather Statement | GYX | 42 min |
| May 16, 8:35 PM EDT | Special Weather Statement | GYX | 40 min |
| May 16, 8:42 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 17, 3:06 AM EDT | Frost Advisory | GYX | 27 hr |
| May 29, 1:49 AM EDT | Special Weather Statement | GYX | 41 min |
| May 29, 2:01 AM EDT | Severe Thunderstorm Warning | GYX | 44 min |
| May 29, 2:24 AM EDT | Areal Flood Advisory | GYX | 2 hr |
| May 29, 2:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 29, 3:44 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 29, 4:50 PM EDT | Severe Thunderstorm Warning | GYX | 55 min |
| May 29, 5:24 PM EDT | Special Weather Statement | GYX | 51 min |
| Jun 1, 11:56 AM EDT | Flood Watch | GYX | 40 hr |
| Jun 4, 12:02 PM EDT | Areal Flood Warning | GYX | 8 hr |
| Jun 8, 8:02 PM EDT | Severe Thunderstorm Warning | GYX | 43 min |
| Jun 8, 8:42 PM EDT | Special Weather Statement | GYX | 63 min |
| Jun 8, 8:58 PM EDT | Severe Thunderstorm Warning | GYX | 62 min |
| Jun 19, 3:13 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 20, 7:22 PM EDT | Heat Advisory | GYX | 24 hr |
| Jun 23, 11:42 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 23, 12:01 PM EDT | Flash Flood Watch | GYX | 8 hr |
| Jun 25, 12:10 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 1, 5:30 PM EDT | Special Weather Statement | GYX | 30 min |
| Jul 4, 4:48 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jul 4, 5:08 PM EDT | Severe Thunderstorm Warning | GYX | 67 min |
| Jul 4, 6:08 PM EDT | Severe Thunderstorm Warning | GYX | 67 min |
| Jul 4, 6:10 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jul 4, 6:38 PM EDT | Severe Thunderstorm Warning | GYX | 67 min |
| Jul 17, 1:23 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 17, 3:32 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 17, 5:57 PM EDT | Severe Thunderstorm Warning | GYX | 48 min |
| Jul 17, 6:30 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 17, 6:44 PM EDT | Severe Thunderstorm Warning | GYX | 61 min |
| Jul 17, 7:21 PM EDT | Severe Thunderstorm Warning | GYX | 54 min |
| Jul 17, 11:49 PM EDT | Severe Thunderstorm Warning | GYX | 41 min |
| Jul 18, 12:29 AM EDT | Severe Thunderstorm Warning | GYX | 46 min |
| Jul 23, 7:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 23, 11:44 PM EDT | Severe Thunderstorm Warning | GYX | 46 min |
| Jul 24, 2:29 AM EDT | Mesoscale Discussion | SPC | 31 min |
| Jul 24, 11:37 AM EDT | Special Weather Statement | GYX | 38 min |
| Jul 24, 12:05 PM EDT | Special Weather Statement | GYX | 40 min |
| Aug 5, 3:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 5, 4:24 PM EDT | Special Weather Statement | GYX | 51 min |
| Aug 5, 4:35 PM EDT | Severe Thunderstorm Warning | GYX | 55 min |
| Aug 9, 10:13 PM EDT | Special Weather Statement | GYX | 47 min |
| Aug 10, 12:20 PM EDT | Flash Flood Watch | GYX | 10 hr |
| Aug 10, 2:36 PM EDT | Severe Thunderstorm Warning | GYX | 54 min |
| Aug 10, 3:51 PM EDT | Special Weather Statement | GYX | 39 min |
| Aug 10, 3:53 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 10, 4:35 PM EDT | Flash Flood Warning | GYX | 3 hr |
| Aug 10, 5:23 PM EDT | Areal Flood Advisory | GYX | 112 min |
| Aug 12, 5:14 PM EDT | Areal Flood Advisory | GYX | 2 hr |
| Aug 12, 5:44 PM EDT | Special Weather Statement | GYX | 31 min |
| Aug 12, 6:12 PM EDT | Severe Thunderstorm Warning | GYX | 48 min |
| Aug 16, 4:23 AM EDT | Flash Flood Warning | GYX | 3 hr |
| Aug 17, 8:27 PM EDT | Severe Thunderstorm Warning | GYX | 63 min |
| Sep 7, 7:11 AM EDT | Dense Fog Advisory | GYX | 109 min |
| Sep 8, 3:55 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Sep 8, 4:47 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 8, 6:15 PM EDT | Severe Thunderstorm Warning | GYX | 60 min |
| Sep 8, 7:15 PM EDT | Severe Thunderstorm Warning | GYX | 60 min |
| Sep 8, 7:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 18, 3:27 AM EDT | Wind Advisory | GYX | 24 hr |
| Sep 19, 3:40 AM EDT | Frost Advisory | GYX | 27 hr |
| Oct 11, 3:04 PM EDT | Freeze Watch | GYX | 12 hr |
| Oct 12, 3:14 AM EDT | Freeze Warning | GYX | 31 hr |
| Oct 27, 4:10 PM EDT | High Wind Watch | GYX | 23 hr |
| Oct 28, 3:07 PM EDT | Flood Watch | GYX | 69 hr |
| Oct 28, 3:14 PM EDT | High Wind Warning | GYX | 36 hr |
| Oct 30, 12:32 AM EDT | Areal Flood Warning | GYX | 8 hr |
| Oct 30, 5:51 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Oct 30, 6:53 PM EDT | Special Weather Statement | GYX | 52 min |
| Oct 30, 9:13 PM EDT | Severe Thunderstorm Warning | GYX | 47 min |
| Nov 7, 3:36 AM EST | Winter Weather Advisory | GYX | 29 hr |
| Dec 1, 3:26 AM EST | Winter Weather Advisory | GYX | 34 hr |
| Dec 4, 12:49 PM EST | Dense Fog Advisory | GYX | 111 min |
| Dec 4, 5:11 PM EST | Dense Fog Advisory | GYX | 7 hr |
| Dec 9, 3:38 PM EST | Winter Weather Advisory | GYX | 23 hr |
| Dec 15, 3:28 AM EST | Winter Storm Watch | GYX | 25 hr |
| Dec 16, 4:06 AM EST | Winter Weather Advisory | GYX | 56 hr |
| Dec 20, 3:05 PM EST | Wind Advisory | GYX | 30 hr |
| Dec 25, 4:05 AM EST | Winter Storm Watch | GYX | 34 hr |
| Dec 25, 3:19 PM EST | Winter Storm Warning | GYX | 57 hr |
| Dec 26, 8:22 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 29, 3:29 AM EST | Winter Weather Advisory | GYX | 24 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 | 20 |
| Severe Thunderstorm Watch | 5 |
| Mesoscale Discussion | 14 |
| Special Weather Statement | 13 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 2 |
| Flood Watch | 3 |
| Areal Flood Advisory | 5 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 4 |
| Freezing Rain Advisory | 1 |
| Winter Weather Advisory | 13 |
| Heat | |
| Heat Advisory | 2 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 4 |
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.