Alert archive / New Hampshire / Strafford County
Weather alerts in Strafford County, New Hampshire, 2017
125 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Strafford County and its neighbors
Each county as a circle sized by its count in 2017. Tap one for its archive.
- Alerts
- 125
- Warnings
- 20
- Watches
- 19
- Advisories
- 49
- Busiest month
- February20 alerts
- Busiest day
- June 19, 20176 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Strafford County, 2017
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 8 | 7 | 13% | 6 | 17% | 3 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
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, 3:38 PM EST | Winter Weather Advisory | GYX | 39 hr |
| Jan 16, 3:12 PM EST | Winter Storm Watch | GYX | 12 hr |
| Jan 17, 3:29 AM EST | Winter Storm Warning | GYX | 32 hr |
| Jan 17, 3:29 AM EST | Winter Weather Advisory | GYX | 38 hr |
| Jan 22, 3:18 PM EST | Winter Storm Watch | GYX | 25 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, 5:43 AM EST | Freezing Rain Advisory | GYX | 19 hr |
| Jan 24, 5:44 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 6, 3:09 PM EST | Winter Weather Advisory | GYX | 42 hr |
| Feb 7, 5:44 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 7, 11:18 PM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 8, 4:42 AM EST | Winter Storm Watch | GYX | 11 hr |
| Feb 8, 3:15 PM EST | Winter Storm Warning | GYX | 31 hr |
| Feb 9, 11:05 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 9, 12:42 PM EST | Special Weather Statement | GYX | 2 hr |
| Feb 10, 3:45 PM EST | Winter Storm Watch | GYX | 25 hr |
| Feb 11, 4:20 PM EST | Blizzard Watch | GYX | 24 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 13, 11:46 AM EST | Wind Advisory | GYX | 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 14, 3:50 PM EST | Winter Weather Advisory | GYX | 42 hr |
| Feb 24, 6:35 PM EST | Dense Fog Advisory | GYX | 18 hr |
| Feb 25, 6:08 PM EST | Dense Fog Advisory | GYX | 6 hr |
| Feb 25, 6:24 PM EST | Mesoscale Discussion | SPC | 66 min |
| Feb 25, 8:40 PM EST | Special Weather Statement | GYX | 65 min |
| 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, 8:04 AM EST | Dense Fog Advisory | GYX | 5 hr |
| Mar 3, 7:34 PM EST | Special Weather Statement | GYX | 41 min |
| Mar 8, 12:46 AM EST | Dense Fog Advisory | GYX | 8 hr |
| Mar 8, 4:28 PM EST | Special Weather Statement | GYX | 47 min |
| Mar 9, 8:14 AM EST | Wind Advisory | GYX | 8 hr |
| Mar 10, 3:02 AM EST | Wind Chill Advisory | GYX | 53 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 13, 3:44 PM EDT | Blizzard Warning | GYX | 36 hr |
| Mar 14, 9:04 AM EDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 14, 1:57 PM EDT | Mesoscale Discussion | SPC | 5 hr |
| Mar 22, 3:31 AM EDT | Wind Advisory | GYX | 17 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 26, 9:14 PM EDT | Freezing Rain Advisory | GYX | 18 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, 8:17 PM EDT | Mesoscale Discussion | SPC | 6 hr |
| Apr 1, 7:20 AM EDT | Mesoscale Discussion | SPC | 5 hr |
| Apr 4, 3:40 PM EDT | Flood Watch | GYX | 60 hr |
| Apr 16, 6:46 PM EDT | Special Weather Statement | GYX | 44 min |
| May 5, 3:02 PM EDT | Flood Watch | GYX | 12 hr |
| May 20, 3:27 AM EDT | Frost Advisory | GYX | 28 hr |
| May 31, 7:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| May 31, 8:49 PM EDT | Special Weather Statement | GYX | 56 min |
| May 31, 9:07 PM EDT | Severe Thunderstorm Warning | GYX | 32 min |
| Jun 1, 3:30 AM EDT | Dense Fog Advisory | GYX | 5 hr |
| Jun 1, 12:06 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 11:22 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jun 13, 8:19 AM EDT | Heat Advisory | GYX | 10 hr |
| Jun 19, 12:24 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 19, 1:00 PM EDT | Severe Thunderstorm Warning | GYX | 60 min |
| Jun 19, 2:58 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 19, 4:29 PM EDT | Severe Thunderstorm Warning | GYX | 46 min |
| Jun 19, 6:39 PM EDT | Severe Thunderstorm Warning | GYX | 36 min |
| Jun 19, 7:31 PM EDT | Areal Flood Advisory | GYX | 59 min |
| Jun 23, 2:02 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 12:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 27, 2:44 PM EDT | Special Weather Statement | GYX | 61 min |
| Jun 27, 3:51 PM EDT | Special Weather Statement | GYX | 54 min |
| Jun 27, 8:00 PM EDT | Special Weather Statement | GYX | 30 min |
| Jul 1, 1:19 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 8, 11:09 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 8, 12:58 PM EDT | Severe Thunderstorm Warning | GYX | 47 min |
| Jul 8, 1:25 PM EDT | Flash Flood Warning | GYX | 2 hr |
| Jul 8, 1:42 PM EDT | Severe Thunderstorm Warning | GYX | 48 min |
| Jul 17, 11:03 PM EDT | Areal Flood Advisory | GYX | 117 min |
| Jul 19, 3:04 AM EDT | Dense Fog Advisory | GYX | 6 hr |
| Aug 4, 5:05 PM EDT | Special Weather Statement | GYX | 25 min |
| Aug 4, 5:43 PM EDT | Special Weather Statement | GYX | 32 min |
| Aug 8, 4:35 PM EDT | Special Weather Statement | GYX | 25 min |
| Aug 18, 4:09 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 18, 6:59 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 22, 3:55 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 22, 10:25 PM EDT | Severe Thunderstorm Warning | GYX | 51 min |
| Aug 22, 10:53 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Sep 5, 4:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 5, 6:08 PM EDT | Severe Thunderstorm Warning | GYX | 52 min |
| Sep 5, 6:56 PM EDT | Special Weather Statement | GYX | 34 min |
| Sep 6, 3:29 AM EDT | Flash Flood Watch | GYX | 24 hr |
| Sep 15, 2:14 PM EDT | Areal Flood Advisory | GYX | 2 hr |
| Sep 15, 11:01 PM EDT | Dense Fog Advisory | GYX | 10 hr |
| Sep 16, 9:39 PM EDT | Dense Fog Advisory | GYX | 13 hr |
| Sep 17, 6:31 PM EDT | Dense Fog Advisory | GYX | 14 hr |
| Sep 18, 5:31 PM EDT | Dense Fog Advisory | GYX | 10 hr |
| Sep 25, 8:33 PM EDT | Dense Fog Advisory | GYX | 12 hr |
| Sep 27, 4:05 AM EDT | Dense Fog Advisory | GYX | 6 hr |
| Sep 30, 3:19 AM EDT | Frost Advisory | GYX | 29 hr |
| Oct 12, 2:37 PM EDT | Frost Advisory | GYX | 16 hr |
| Oct 15, 3:05 AM EDT | Dense Fog Advisory | GYX | 7 hr |
| Oct 23, 10:49 PM EDT | Dense Fog Advisory | GYX | 6 hr |
| Oct 25, 12:56 AM EDT | Areal Flood Advisory | GYX | 6 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 |
| Nov 9, 3:25 PM EST | Wind Advisory | GYX | 29 hr |
| Nov 18, 2:48 PM EST | Wind Advisory | GYX | 30 hr |
| Dec 8, 3:02 PM EST | Winter Storm Watch | GYX | 12 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 Weather Advisory | GYX | 32 hr |
| Dec 13, 3:29 AM EST | Wind Advisory | GYX | 15 hr |
| Dec 16, 4:37 PM EST | Special Weather Statement | GYX | 68 min |
| Dec 18, 3:04 PM EST | Winter Weather Advisory | GYX | 12 hr |
| Dec 21, 3:45 PM EST | Winter Storm Watch | GYX | 8 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, 9:50 AM EST | Mesoscale Discussion | SPC | 4 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 25, 4:36 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Dec 27, 3:55 AM EST | Wind Chill Advisory | GYX | 57 hr |
| Dec 30, 3:22 AM EST | Wind Chill 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 | 8 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 15 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Flood Watch | 2 |
| Areal Flood Advisory | 7 |
| Winter | |
| Blizzard Warning | 1 |
| Winter Storm Warning | 8 |
| Blizzard Watch | 1 |
| Winter Storm Watch | 11 |
| Freezing Rain Advisory | 2 |
| Winter Weather Advisory | 11 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Frost Advisory | 3 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
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.