Alert archive / New Hampshire / Coos County
Weather alerts in Coos County, New Hampshire, 2017
145 weather alerts in 2017, 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 2017. Tap one for its archive.
- Alerts
- 145
- Warnings
- 46
- Watches
- 16
- Advisories
- 41
- Busiest month
- August20 alerts
- Busiest day
- October 30, 20177 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, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 9 | 31% | 7 | 86% | 30 min |
| Flash flood warnings | 8 | 6 | 25% | 2 | 100% | 155 min |
Each office's whole area, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gray, ME: tornado warnings | 7 | 3 | 57% | 10 | 80% | 16 min |
| NWS Gray, ME: severe thunderstorm warnings | 88 | 66 | 25% | 173 | 84% | 27 min |
| NWS Gray, ME: flash flood warnings | 25 | 14 | 44% | 51 | 90% | 92 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 2, 3:17 AM EST | Winter Storm Watch | GYX | 24 hr |
| Jan 2, 3:38 PM EST | Winter Weather Advisory | GYX | 39 hr |
| Jan 4, 2:16 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 8, 3:13 PM EST | Wind Chill Warning | GYX | 18 hr |
| Jan 13, 3:08 AM EST | Wind Chill Advisory | GYX | 29 hr |
| Jan 17, 3:29 AM EST | Winter Weather Advisory | GYX | 38 hr |
| Jan 23, 3:18 AM EST | Winter Weather Advisory | GYX | 48 hr |
| Jan 23, 11:48 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 24, 5:44 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 27, 9:25 PM EST | Winter Weather Advisory | GYX | 10 hr |
| Feb 6, 3:09 PM EST | Winter Weather Advisory | GYX | 42 hr |
| Feb 9, 9:28 AM EST | Winter Weather Advisory | GYX | 11 hr |
| Feb 9, 8:49 PM EST | Wind Chill Advisory | GYX | 13 hr |
| Feb 10, 3:45 PM EST | Winter Storm Watch | GYX | 25 hr |
| Feb 11, 4:20 PM EST | Winter Storm Warning | GYX | 51 hr |
| Feb 12, 2:51 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 14, 3:49 AM EST | Winter Storm Watch | GYX | 24 hr |
| Feb 14, 3:50 PM EST | Winter Storm Warning | GYX | 46 hr |
| Feb 23, 2:58 PM EST | Flood Watch | GYX | 4 days |
| Feb 24, 6:35 PM EST | Dense Fog Advisory | GYX | 18 hr |
| Feb 25, 1:17 PM EST | Areal Flood Advisory | GYX | 6 hr |
| Feb 25, 9:42 PM EST | Special Weather Statement | GYX | 63 min |
| Mar 1, 3:28 AM EST | Wind Advisory | GYX | 39 hr |
| Mar 1, 11:12 PM EST | Dense Fog Advisory | GYX | 7 hr |
| Mar 3, 3:34 AM EST | Wind Chill Advisory | GYX | 302 days |
| Mar 8, 4:28 PM EST | Special Weather Statement | GYX | 47 min |
| Mar 10, 3:02 AM EST | Wind Chill Advisory | GYX | 53 hr |
| Mar 10, 3:42 PM EST | Wind Chill Warning | GYX | 41 hr |
| Mar 11, 4:01 PM EST | Winter Storm Watch | GYX | 35 hr |
| Mar 13, 3:58 AM EDT | Winter Storm Warning | GYX | 55 hr |
| Mar 14, 1:57 PM EDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 14, 5:36 PM EDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 22, 4:48 AM EDT | Special Weather Statement | GYX | 72 min |
| Mar 24, 1:56 PM EDT | Winter Weather Advisory | GYX | 9 hr |
| Mar 26, 4:08 AM EDT | Winter Weather Advisory | GYX | 17 hr |
| Mar 26, 9:14 PM EDT | Winter Weather Advisory | GYX | 20 hr |
| Mar 29, 3:56 PM EDT | Winter Storm Watch | GYX | 35 hr |
| Mar 30, 3:57 PM EDT | Winter Storm Warning | GYX | 51 hr |
| Mar 31, 3:21 AM EDT | Winter Weather Advisory | GYX | 39 hr |
| Apr 3, 3:34 PM EDT | Winter Weather Advisory | GYX | 13 hr |
| Apr 4, 4:27 AM EDT | Winter Weather Advisory | GYX | 23 hr |
| Apr 11, 12:19 PM EDT | Flood Watch | GYX | 32 hr |
| Apr 11, 9:44 PM EDT | River Flood Warning | GYX | 72 hr |
| Apr 16, 6:05 PM EDT | Special Weather Statement | GYX | 40 min |
| Apr 16, 9:09 PM EDT | River Flood Warning | GYX | 65 hr |
| Apr 17, 5:11 AM EDT | River Flood Warning | GYX | 41 hr |
| May 2, 2:44 PM EDT | River Flood Warning | GYX | 5 days |
| May 15, 9:25 PM EDT | River Flood Warning | GYX | 35 hr |
| May 18, 5:44 PM EDT | Special Weather Statement | GYX | 31 min |
| May 18, 6:15 PM EDT | Special Weather Statement | GYX | 30 min |
| May 18, 8:50 PM EDT | Special Weather Statement | GYX | 25 min |
| May 18, 9:16 PM EDT | Severe Thunderstorm Warning | GYX | 44 min |
| May 18, 9:22 PM EDT | Severe Thunderstorm Warning | GYX | 38 min |
| May 18, 9:53 PM EDT | Severe Thunderstorm Warning | GYX | 52 min |
| May 20, 3:27 AM EDT | Freeze Warning | GYX | 28 hr |
| May 31, 12:29 PM EDT | Mesoscale Discussion | SPC | 61 min |
| May 31, 1:22 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 31, 4:33 PM EDT | Severe Thunderstorm Warning | GYX | 42 min |
| May 31, 4:46 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 31, 4:58 PM EDT | Severe Thunderstorm Warning | GYX | 47 min |
| May 31, 5:44 PM EDT | Severe Thunderstorm Warning | GYX | 61 min |
| Jun 7, 3:21 AM EDT | Dense Fog Advisory | GYX | 4 hr |
| Jun 18, 3:19 AM EDT | Flash Flood Watch | GYX | 41 hr |
| Jun 19, 10:45 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 19, 12:24 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 2:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 5:02 PM EDT | Flash Flood Warning | GYX | 3 hr |
| Jun 23, 2:02 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 25, 6:45 PM EDT | Special Weather Statement | GYX | 30 min |
| Jun 25, 7:09 PM EDT | Severe Thunderstorm Warning | GYX | 41 min |
| Jun 30, 3:38 AM EDT | Flash Flood Watch | GYX | 46 hr |
| Jul 1, 12:32 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jul 1, 4:08 PM EDT | Areal Flood Advisory | GYX | 2 hr |
| Jul 1, 4:19 PM EDT | Flash Flood Warning | GYX | 116 min |
| Jul 1, 4:40 PM EDT | Severe Thunderstorm Warning | GYX | 65 min |
| Jul 1, 5:10 PM EDT | Flash Flood Warning | GYX | 2 hr |
| Jul 1, 6:19 PM EDT | Areal Flood Warning | GYX | 116 min |
| Jul 1, 9:34 PM EDT | Flash Flood Warning | GYX | 3 hr |
| Jul 8, 10:07 AM EDT | Special Weather Statement | GYX | 38 min |
| Jul 8, 10:50 AM EDT | Special Weather Statement | GYX | 40 min |
| Jul 8, 3:20 PM EDT | Areal Flood Advisory | GYX | 115 min |
| Jul 8, 3:37 PM EDT | Severe Thunderstorm Warning | GYX | 38 min |
| Jul 17, 4:29 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 17, 7:10 PM EDT | Severe Thunderstorm Warning | GYX | 65 min |
| Jul 20, 1:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 4:15 PM EDT | Special Weather Statement | GYX | 30 min |
| Jul 31, 4:34 PM EDT | Special Weather Statement | GYX | 41 min |
| Aug 2, 10:25 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 3, 1:30 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 3, 1:52 PM EDT | Special Weather Statement | GYX | 23 min |
| Aug 3, 5:40 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 5, 11:36 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Aug 5, 4:23 PM EDT | Special Weather Statement | GYX | 52 min |
| Aug 11, 1:42 PM EDT | Special Weather Statement | GYX | 33 min |
| Aug 11, 2:19 PM EDT | Special Weather Statement | GYX | 41 min |
| Aug 12, 7:31 PM EDT | Special Weather Statement | GYX | 29 min |
| Aug 12, 8:18 PM EDT | Special Weather Statement | GYX | 27 min |
| Aug 12, 8:36 PM EDT | Special Weather Statement | GYX | 24 min |
| Aug 12, 8:55 PM EDT | Special Weather Statement | GYX | 35 min |
| Aug 12, 9:30 PM EDT | Special Weather Statement | GYX | 30 min |
| Aug 15, 6:13 PM EDT | Special Weather Statement | GYX | 47 min |
| Aug 22, 3:55 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 22, 5:49 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 22, 7:03 PM EDT | Severe Thunderstorm Warning | GYX | 57 min |
| Aug 22, 7:58 PM EDT | Severe Thunderstorm Warning | GYX | 47 min |
| Aug 22, 8:04 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Aug 22, 9:28 PM EDT | Special Weather Statement | GYX | 47 min |
| Sep 1, 3:07 PM EDT | Frost Advisory | GYX | 15 hr |
| Sep 25, 7:08 AM EDT | Dense Fog Advisory | GYX | 112 min |
| Sep 25, 8:33 PM EDT | Dense Fog Advisory | GYX | 12 hr |
| Sep 30, 3:19 AM EDT | Freeze Warning | GYX | 29 hr |
| Oct 25, 12:33 AM EDT | Severe Thunderstorm Warning | GYX | 57 min |
| Oct 25, 12:56 AM EDT | Areal Flood Advisory | GYX | 6 hr |
| Oct 25, 1:21 AM EDT | Flash Flood Warning | GYX | 6 hr |
| Oct 26, 8:19 PM EDT | Areal Flood Advisory | GYX | 116 min |
| Oct 26, 8:44 PM EDT | Areal Flood Warning | GYX | 3 hr |
| Oct 26, 10:04 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Oct 26, 10:26 PM EDT | Areal Flood Warning | GYX | 2 hr |
| Oct 28, 3:55 AM EDT | Flash Flood Watch | GYX | 63 hr |
| Oct 29, 3:59 AM EDT | High Wind Warning | GYX | 30 hr |
| Oct 29, 3:59 AM EDT | Wind Advisory | GYX | 38 hr |
| Oct 30, 1:19 AM EDT | Areal Flood Warning | GYX | 6 hr |
| Oct 30, 2:55 AM EDT | Flash Flood Warning | GYX | 6 hr |
| Oct 30, 4:04 AM EDT | Flash Flood Warning | GYX | 6 hr |
| Oct 30, 4:21 AM EDT | Flash Flood Warning | GYX | 6 hr |
| Oct 30, 8:53 AM EDT | Areal Flood Warning | GYX | 6 hr |
| Oct 30, 10:36 AM EDT | River Flood Warning | GYX | 11 hr |
| Oct 30, 6:47 PM EDT | Flash Flood Watch | GYX | 15 hr |
| Nov 9, 3:25 PM EST | Wind Advisory | GYX | 29 hr |
| Nov 10, 2:11 AM EST | Special Weather Statement | GYX | 64 min |
| Nov 10, 2:47 AM EST | Special Weather Statement | GYX | 118 min |
| Nov 18, 2:49 PM EST | Winter Weather Advisory | GYX | 13 hr |
| Dec 9, 3:22 AM EST | Winter Weather Advisory | GYX | 24 hr |
| Dec 10, 3:16 PM EST | Winter Storm Watch | GYX | 24 hr |
| Dec 11, 3:32 PM EST | Winter Storm Warning | GYX | 44 hr |
| Dec 21, 3:45 PM EST | Winter Weather Advisory | GYX | 53 hr |
| Dec 21, 11:29 PM EST | Winter Storm Warning | GYX | 27 hr |
| Dec 23, 1:49 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 23, 2:59 PM EST | Winter Storm Watch | GYX | 12 hr |
| Dec 24, 2:51 AM EST | Winter Storm Warning | GYX | 36 hr |
| Dec 26, 2:32 AM EST | Wind Chill Advisory | GYX | 40 hr |
| Dec 27, 3:55 AM EST | Wind Chill Advisory | GYX | 57 hr |
| Dec 27, 2:56 PM EST | Wind Chill Warning | GYX | 40 hr |
| Dec 30, 3:22 AM EST | Wind Chill Advisory | GYX | 24 hr |
| Dec 30, 3:31 PM EST | Wind Chill Warning | GYX | 63 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 | 13 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 17 |
| Special Weather Statement | 25 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 8 |
| River Flood Warning | 6 |
| Flash Flood Watch | 4 |
| Flood Watch | 2 |
| Areal Flood Advisory | 10 |
| Winter | |
| Winter Storm Warning | 7 |
| Winter Storm Watch | 7 |
| Winter Weather Advisory | 15 |
| Cold | |
| Freeze Warning | 2 |
| Wind Chill Warning | 4 |
| Frost Advisory | 1 |
| Wind Chill Advisory | 7 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 3 |
| Fog and smoke | |
| Dense Fog Advisory | 5 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20162018
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.