Alert archive / New Hampshire / Belknap County
Weather alerts in Belknap County, New Hampshire, 2021
101 weather alerts in 2021, 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 2021. Tap one for its archive.
- Alerts
- 101
- Warnings
- 27
- Watches
- 11
- Advisories
- 27
- Busiest month
- July22 alerts
- Busiest day
- September 15, 20218 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, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 21 | 21 | 0% | 12 | 92% | 25 min |
| Flash flood warnings | 2 | 2 | 0% | 3 | 100% | 134 min |
Each office's whole area, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gray, ME: tornado warnings | 4 | 0 | 100% | 0 | ||
| NWS Gray, ME: severe thunderstorm warnings | 99 | 71 | 28% | 208 | 88% | 19 min |
| NWS Gray, ME: flash flood warnings | 20 | 10 | 50% | 37 | 95% | 124 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 20, 5:23 PM EST | Special Weather Statement | GYX | 67 min |
| Jan 22, 2:36 PM EST | Special Weather Statement | GYX | 69 min |
| Jan 22, 3:30 PM EST | Special Weather Statement | GYX | 90 min |
| Jan 24, 6:50 AM EST | Wind Advisory | GYX | 8 hr |
| Jan 30, 3:25 PM EST | Winter Storm Watch | GYX | 37 hr |
| Jan 31, 3:25 PM EST | Winter Storm Warning | GYX | 59 hr |
| Feb 2, 8:41 AM EST | Winter Weather Advisory | GYX | 10 hr |
| Feb 5, 10:48 AM EST | Special Weather Statement | GYX | 57 min |
| Feb 14, 2:30 AM EST | Winter Storm Watch | GYX | 27 hr |
| Feb 15, 3:59 AM EST | Winter Weather Advisory | GYX | 33 hr |
| Feb 16, 2:51 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 22, 10:40 AM EST | Winter Weather Advisory | GYX | 12 hr |
| Feb 26, 3:19 PM EST | Winter Weather Advisory | GYX | 28 hr |
| Mar 1, 3:23 AM EST | Wind Advisory | GYX | 37 hr |
| Mar 1, 10:18 PM EST | Special Weather Statement | GYX | 57 min |
| Mar 12, 3:18 AM EST | Wind Advisory | GYX | 31 hr |
| Mar 13, 12:18 AM EST | Special Weather Statement | GYX | 42 min |
| Mar 26, 4:02 PM EDT | Special Weather Statement | GYX | 28 min |
| Mar 26, 4:52 PM EDT | Severe Thunderstorm Warning | GYX | 38 min |
| Mar 28, 3:28 AM EDT | Wind Advisory | GYX | 38 hr |
| Apr 14, 3:18 PM EDT | Winter Storm Watch | GYX | 12 hr |
| Apr 15, 3:14 AM EDT | Winter Storm Warning | GYX | 38 hr |
| May 12, 3:30 AM EDT | Frost Advisory | GYX | 28 hr |
| May 26, 3:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| May 26, 3:56 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 26, 5:52 PM EDT | Severe Thunderstorm Warning | GYX | 53 min |
| May 26, 5:58 PM EDT | Severe Thunderstorm Warning | GYX | 62 min |
| May 26, 6:07 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 26, 6:59 PM EDT | Severe Thunderstorm Warning | GYX | 61 min |
| Jun 5, 2:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 6, 3:11 AM EDT | Heat Advisory | GYX | 63 hr |
| Jun 15, 2:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 2:40 PM EDT | Special Weather Statement | GYX | 35 min |
| Jun 15, 3:10 PM EDT | Special Weather Statement | GYX | 35 min |
| Jun 15, 3:24 PM EDT | Severe Thunderstorm Warning | GYX | 51 min |
| Jun 15, 3:53 PM EDT | Severe Thunderstorm Warning | GYX | 40 min |
| Jun 27, 3:37 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 28, 4:13 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 28, 8:11 PM EDT | Special Weather Statement | GYX | 34 min |
| Jun 29, 2:30 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 29, 6:12 PM EDT | Severe Thunderstorm Warning | GYX | 33 min |
| Jun 30, 11:04 AM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 30, 12:06 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 1:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jun 30, 3:42 PM EDT | Special Weather Statement | GYX | 48 min |
| Jun 30, 4:01 PM EDT | Severe Thunderstorm Warning | GYX | 27 min |
| Jun 30, 4:11 PM EDT | Severe Thunderstorm Warning | GYX | 49 min |
| Jun 30, 4:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 8, 4:09 AM EDT | Flash Flood Watch | GYX | 39 hr |
| Jul 11, 3:15 PM EDT | Flash Flood Watch | GYX | 22 hr |
| Jul 14, 3:11 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 14, 4:29 PM EDT | Special Weather Statement | GYX | 31 min |
| Jul 14, 4:41 PM EDT | Severe Thunderstorm Warning | GYX | 34 min |
| Jul 14, 5:15 PM EDT | Special Weather Statement | GYX | 30 min |
| Jul 18, 7:59 AM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 20, 7:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 20, 9:35 PM EDT | Severe Thunderstorm Warning | GYX | 40 min |
| Jul 20, 10:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 20, 10:10 PM EDT | Severe Thunderstorm Warning | GYX | 50 min |
| Jul 20, 10:38 PM EDT | Severe Thunderstorm Warning | GYX | 41 min |
| Jul 20, 10:57 PM EDT | Severe Thunderstorm Warning | GYX | 48 min |
| Jul 23, 12:57 PM EDT | Severe Thunderstorm Warning | GYX | 33 min |
| Jul 23, 1:20 PM EDT | Special Weather Statement | GYX | 25 min |
| Jul 23, 2:36 PM EDT | Special Weather Statement | GYX | 24 min |
| Jul 23, 2:42 PM EDT | Severe Thunderstorm Warning | GYX | 33 min |
| Jul 23, 5:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 23, 8:06 PM EDT | Special Weather Statement | GYX | 39 min |
| Jul 25, 9:57 PM EDT | Special Weather Statement | GYX | 33 min |
| Jul 29, 8:58 PM EDT | Areal Flood Advisory | GYX | 4 hr |
| Jul 29, 9:33 PM EDT | Flash Flood Warning | GYX | 5 hr |
| Aug 1, 8:15 PM EDT | Flash Flood Warning | GYX | 6 hr |
| Aug 10, 3:15 AM EDT | Heat Advisory | GYX | 4 days |
| Aug 11, 4:57 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Aug 12, 5:50 PM EDT | Special Weather Statement | GYX | 55 min |
| Aug 18, 3:02 PM EDT | Flash Flood Watch | GYX | 31 hr |
| Aug 25, 3:13 PM EDT | Heat Advisory | GYX | 29 hr |
| Sep 2, 3:49 AM EDT | Areal Flood Advisory | GYX | 5 hr |
| Sep 15, 11:59 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 15, 1:15 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Sep 15, 2:31 PM EDT | Severe Thunderstorm Warning | GYX | 59 min |
| Sep 15, 3:04 PM EDT | Severe Thunderstorm Warning | GYX | 56 min |
| Sep 15, 3:22 PM EDT | Severe Thunderstorm Warning | GYX | 53 min |
| Sep 15, 4:09 PM EDT | Severe Thunderstorm Warning | GYX | 51 min |
| Sep 15, 4:38 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Sep 15, 4:44 PM EDT | Severe Thunderstorm Warning | GYX | 46 min |
| Sep 24, 2:14 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Oct 11, 2:29 PM EDT | Dense Fog Advisory | GYX | 19 hr |
| Oct 29, 3:22 PM EDT | Flash Flood Watch | GYX | 39 hr |
| Oct 30, 10:12 PM EDT | Areal Flood Advisory | GYX | 6 hr |
| Oct 31, 4:02 AM EDT | Areal Flood Warning | GYX | 8 hr |
| Nov 12, 2:05 PM EST | Special Weather Statement | GYX | 55 min |
| Nov 12, 2:28 PM EST | Areal Flood Advisory | GYX | 3 hr |
| Dec 10, 4:32 PM EST | Winter Weather Advisory | GYX | 26 hr |
| Dec 16, 3:14 PM EST | Dense Fog Advisory | GYX | 12 hr |
| Dec 17, 2:47 AM EST | Winter Storm Watch | GYX | 13 hr |
| Dec 17, 3:34 PM EST | Winter Storm Warning | GYX | 42 hr |
| Dec 21, 3:29 AM EST | Winter Weather Advisory | GYX | 36 hr |
| Dec 22, 4:26 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 24, 3:26 AM EST | Winter Weather Advisory | GYX | 51 hr |
| Dec 25, 5:44 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 27, 3:11 PM EST | Winter Weather Advisory | GYX | 19 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 | 21 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 19 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 4 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 6 |
| Cold | |
| Frost Advisory | 1 |
| Wind and dust | |
| Wind Advisory | 4 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.