Alert archive / New Hampshire / Coos County
Weather alerts in Coos County, New Hampshire, 2021
92 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Coos County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 92
- Warnings
- 18
- Watches
- 12
- Advisories
- 29
- Busiest month
- June20 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.
Coos County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 10 | 9 | 10% | 5 | 100% | 22 min |
| Flash flood warnings | 0 | 1 | 0% |
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 1, 3:13 AM EST | Winter Storm Warning | GYX | 36 hr |
| Jan 2, 8:04 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 15, 6:49 AM EST | Winter Weather Advisory | GYX | 36 hr |
| Jan 15, 4:20 PM EST | Winter Storm Warning | GYX | 35 hr |
| Jan 16, 4:33 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 17, 3:08 AM EST | Winter Weather Advisory | GYX | 13 hr |
| Jan 20, 12:05 PM EST | Special Weather Statement | GYX | 40 min |
| Jan 23, 3:41 AM EST | Wind Chill Advisory | GYX | 29 hr |
| Jan 28, 3:23 AM EST | Wind Chill Advisory | GYX | 30 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 11, 3:57 AM EST | Wind Chill Advisory | GYX | 28 hr |
| Feb 14, 2:30 AM EST | Winter Storm Watch | GYX | 27 hr |
| Feb 15, 3:59 AM EST | Winter Storm Warning | GYX | 33 hr |
| Feb 25, 10:24 AM EST | Special Weather Statement | GYX | 111 min |
| Feb 26, 3:19 PM EST | Winter Weather Advisory | GYX | 28 hr |
| Feb 28, 3:04 PM EST | Wind Chill Watch | GYX | 12 hr |
| Mar 1, 2:39 AM EST | Wind Chill Warning | GYX | 32 hr |
| Mar 1, 3:23 AM EST | Wind Advisory | GYX | 37 hr |
| Mar 2, 10:53 AM EST | Winter Weather Advisory | GYX | 5 min |
| Mar 2, 10:58 AM EST | Wind Chill Advisory | GYX | 5 hr |
| Mar 12, 9:19 PM EST | Special Weather Statement | GYX | 56 min |
| Mar 13, 12:57 AM EST | Special Weather Statement | GYX | 63 min |
| Mar 14, 3:24 AM EDT | Wind Chill Advisory | GYX | 33 hr |
| Mar 28, 3:28 AM EDT | Wind Advisory | GYX | 38 hr |
| Mar 28, 3:39 AM EDT | Flood Watch | GYX | 23 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 |
| Apr 15, 3:14 AM EDT | Winter Weather Advisory | GYX | 38 hr |
| Apr 21, 2:56 AM EDT | Winter Weather Advisory | GYX | 35 hr |
| May 16, 3:50 PM EDT | Special Weather Statement | GYX | 25 min |
| May 23, 2:28 PM EDT | Frost Advisory | GYX | 17 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, 4:51 PM EDT | Severe Thunderstorm Warning | GYX | 54 min |
| May 27, 3:07 AM EDT | Freeze Warning | GYX | 28 hr |
| Jun 5, 2:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Jun 15, 2:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 6:21 PM EDT | Special Weather Statement | GYX | 39 min |
| Jun 15, 7:06 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jun 15, 8:01 PM EDT | Areal Flood Advisory | GYX | 119 min |
| Jun 19, 12:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 19, 2:40 PM EDT | Special Weather Statement | GYX | 35 min |
| Jun 19, 3:12 PM EDT | Special Weather Statement | GYX | 33 min |
| Jun 21, 1:11 PM EDT | Severe Thunderstorm Watch | SPC | 10 hr |
| Jun 21, 5:47 PM EDT | Severe Thunderstorm Warning | GYX | 43 min |
| Jun 21, 6:25 PM EDT | Special Weather Statement | GYX | 35 min |
| Jun 21, 6:38 PM EDT | Severe Thunderstorm Warning | GYX | 52 min |
| Jun 21, 7:36 PM EDT | Special Weather Statement | GYX | 24 min |
| Jun 28, 4:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 28, 5:41 PM EDT | Special Weather Statement | GYX | 34 min |
| Jun 28, 6:36 PM EDT | Special Weather Statement | GYX | 24 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, 3:10 PM EDT | Severe Thunderstorm Warning | GYX | 17 min |
| Jul 9, 3:15 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 14, 3:11 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 12:31 PM EDT | Special Weather Statement | GYX | 29 min |
| Jul 23, 3:35 PM EDT | Special Weather Statement | GYX | 25 min |
| Jul 23, 5:18 PM EDT | Severe Thunderstorm Warning | GYX | 42 min |
| Jul 23, 5:59 PM EDT | Special Weather Statement | GYX | 31 min |
| Aug 1, 3:51 AM EDT | Flash Flood Watch | GYX | 24 hr |
| Aug 8, 5:10 PM EDT | Areal Flood Advisory | GYX | 71 min |
| Aug 10, 2:41 PM EDT | Heat Advisory | GYX | 53 hr |
| Aug 14, 5:44 AM EDT | Special Weather Statement | GYX | 31 min |
| Aug 14, 6:06 AM EDT | Special Weather Statement | GYX | 39 min |
| Sep 6, 1:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 6, 2:32 PM EDT | Special Weather Statement | GYX | 28 min |
| Sep 6, 6:21 PM EDT | Special Weather Statement | GYX | 39 min |
| Sep 15, 7:50 AM EDT | Special Weather Statement | GYX | 55 min |
| 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, 2:18 PM EDT | Severe Thunderstorm Warning | GYX | 57 min |
| Sep 15, 2:31 PM EDT | Severe Thunderstorm Warning | GYX | 59 min |
| Sep 15, 2:33 PM EDT | Severe Thunderstorm Warning | GYX | 42 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 24, 2:14 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Nov 11, 2:52 PM EST | Wind Advisory | GYX | 29 hr |
| Nov 12, 2:28 PM EST | Areal Flood Advisory | GYX | 3 hr |
| Nov 17, 3:21 AM EST | Winter Weather Advisory | GYX | 24 hr |
| Nov 19, 11:00 AM EST | Special Weather Statement | GYX | 45 min |
| Nov 25, 2:39 AM EST | Winter Storm Watch | GYX | 12 hr |
| Nov 25, 2:55 PM EST | Winter Weather Advisory | GYX | 45 hr |
| Dec 3, 9:42 AM EST | Wind Advisory | GYX | 5 hr |
| Dec 10, 4:32 PM EST | Winter Weather Advisory | GYX | 26 hr |
| Dec 15, 2:55 AM EST | Winter Weather Advisory | GYX | 33 hr |
| Dec 16, 3:14 PM EST | Wind Advisory | GYX | 21 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 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 | 10 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 12 |
| Special Weather Statement | 21 |
| Flooding | |
| Flash Flood Watch | 1 |
| Flood Watch | 1 |
| Areal Flood Advisory | 6 |
| Winter | |
| Winter Storm Warning | 6 |
| Winter Storm Watch | 5 |
| Winter Weather Advisory | 11 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Wind Chill Warning | 1 |
| Wind Chill Watch | 1 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 5 |
| Wind and dust | |
| Wind Advisory | 5 |
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.