Alert archive / New Hampshire / Strafford County
Weather alerts in Strafford County, New Hampshire, 2011
112 weather alerts in 2011, 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 2011. Tap one for its archive.
- Alerts
- 112
- Warnings
- 33
- Watches
- 19
- Advisories
- 25
- Busiest month
- July19 alerts
- Busiest day
- July 26, 201110 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, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 19 | 16 | 16% | 8 | 100% | 20 min |
| Flash flood warnings | 1 | 0 | 100% | 0 |
Each office's whole area, 2011
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gray, ME: tornado warnings | 5 | 2 | 60% | 2 | 100% | 11 min |
| NWS Gray, ME: severe thunderstorm warnings | 159 | 136 | 14% | 296 | 89% | 23 min |
| NWS Gray, ME: flash flood warnings | 11 | 5 | 55% | 32 | 81% | 157 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 10, 3:16 PM EST | Winter Storm Watch | GYX | 12 hr |
| Jan 11, 3:10 AM EST | Winter Storm Warning | GYX | 42 hr |
| Jan 12, 6:27 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Jan 17, 3:40 AM EST | Winter Storm Watch | GYX | 11 hr |
| Jan 17, 3:08 PM EST | Winter Storm Warning | GYX | 35 hr |
| Jan 18, 12:37 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Jan 20, 2:53 PM EST | Winter Storm Warning | GYX | 26 hr |
| Jan 20, 2:53 PM EST | Winter Weather Advisory | GYX | 23 hr |
| Jan 21, 7:32 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 23, 3:08 PM EST | Wind Chill Warning | GYX | 22 hr |
| Jan 31, 2:48 PM EST | Winter Storm Watch | GYX | 13 hr |
| Jan 31, 2:48 PM EST | Winter Weather Advisory | GYX | 28 hr |
| Feb 1, 3:58 AM EST | Winter Storm Warning | GYX | 41 hr |
| Feb 2, 2:57 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 4, 3:26 PM EST | Winter Storm Watch | GYX | 12 hr |
| Feb 5, 3:37 AM EST | Winter Weather Advisory | GYX | 26 hr |
| Feb 5, 4:45 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 14, 3:04 PM EST | Wind Advisory | GYX | 19 hr |
| Feb 23, 3:37 PM EST | Winter Storm Watch | GYX | 13 hr |
| Feb 24, 4:21 AM EST | Winter Storm Warning | GYX | 42 hr |
| Feb 27, 3:43 PM EST | Winter Weather Advisory | GYX | 23 hr |
| Mar 6, 2:34 PM EST | Flood Watch | GYX | 18 hr |
| Mar 10, 3:48 AM EST | Flood Watch | GYX | 57 hr |
| Mar 11, 10:08 AM EST | Areal Flood Advisory | GYX | 3 hr |
| Mar 17, 3:03 PM EDT | Wind Advisory | GYX | 29 hr |
| Mar 20, 3:26 PM EDT | Winter Weather Advisory | GYX | 43 hr |
| Mar 31, 3:44 AM EDT | Winter Storm Warning | GYX | 40 hr |
| Apr 4, 3:42 PM EDT | Wind Advisory | GYX | 24 hr |
| Apr 16, 3:40 AM EDT | Wind Advisory | GYX | 32 hr |
| Apr 21, 8:46 AM EDT | Wind Advisory | GYX | 11 hr |
| May 7, 12:57 PM EDT | Special Weather Statement | GYX | 48 min |
| May 7, 1:43 PM EDT | Special Weather Statement | GYX | 62 min |
| May 19, 5:46 AM EDT | Areal Flood Advisory | GYX | 119 min |
| May 24, 1:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| May 24, 5:33 PM EDT | Special Weather Statement | GYX | 42 min |
| May 27, 1:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 27, 2:00 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 27, 5:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 1, 8:28 AM EDT | Severe Thunderstorm Warning | GYX | 62 min |
| Jun 1, 12:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 1, 12:58 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 1, 4:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 1, 6:23 PM EDT | Special Weather Statement | GYX | 37 min |
| Jun 1, 7:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 1, 7:40 PM EDT | Tornado Watch | SPC | 2 hr |
| Jun 1, 9:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 9, 12:06 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 9, 3:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jun 9, 3:38 PM EDT | Severe Thunderstorm Warning | GYX | 67 min |
| Jun 9, 3:56 PM EDT | Severe Thunderstorm Warning | GYX | 64 min |
| Jun 9, 4:17 PM EDT | Mesoscale Discussion | SPC | 88 min |
| Jun 9, 4:55 PM EDT | Severe Thunderstorm Warning | GYX | 25 min |
| Jun 9, 7:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 18, 5:17 PM EDT | Severe Thunderstorm Warning | GYX | 43 min |
| Jun 18, 6:12 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 18, 6:14 PM EDT | Severe Thunderstorm Warning | GYX | 32 min |
| Jul 4, 12:10 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 2:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 4, 5:06 PM EDT | Severe Thunderstorm Warning | GYX | 54 min |
| Jul 6, 7:11 PM EDT | Special Weather Statement | GYX | 49 min |
| Jul 8, 8:34 PM EDT | Special Weather Statement | GYX | 41 min |
| Jul 20, 3:21 PM EDT | Heat Advisory | GYX | 29 hr |
| Jul 21, 8:08 PM EDT | Heat Advisory | GYX | 22 hr |
| Jul 22, 4:30 AM EDT | Excessive Heat Warning | GYX | 14 hr |
| Jul 26, 11:05 AM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 26, 1:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 26, 2:29 PM EDT | Severe Thunderstorm Warning | GYX | 46 min |
| Jul 26, 2:30 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 26, 3:14 PM EDT | Severe Thunderstorm Warning | GYX | 17 min |
| Jul 26, 4:53 PM EDT | Areal Flood Advisory | GYX | 82 min |
| Jul 26, 5:22 PM EDT | Severe Thunderstorm Warning | GYX | 38 min |
| Jul 26, 5:24 PM EDT | Flash Flood Warning | GYX | 3 hr |
| Jul 26, 5:39 PM EDT | Severe Thunderstorm Warning | GYX | 36 min |
| Jul 26, 6:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 26, 8:10 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Aug 1, 2:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 2, 10:42 AM EDT | Mesoscale Discussion | SPC | 63 min |
| Aug 2, 11:31 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 2, 2:33 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Aug 2, 5:02 PM EDT | Severe Thunderstorm Warning | GYX | 58 min |
| Aug 15, 12:25 PM EDT | Flood Watch | GYX | 10 hr |
| Aug 19, 4:19 PM EDT | Severe Thunderstorm Warning | GYX | 56 min |
| Aug 19, 4:42 PM EDT | Severe Thunderstorm Warning | GYX | 48 min |
| Aug 19, 5:41 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Aug 21, 3:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 21, 3:24 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 21, 3:30 PM EDT | Severe Thunderstorm Warning | GYX | 45 min |
| Aug 21, 4:00 PM EDT | Severe Thunderstorm Warning | GYX | 45 min |
| Aug 21, 4:36 PM EDT | Severe Thunderstorm Warning | GYX | 39 min |
| Aug 26, 3:03 PM EDT | Flood Watch | GYX | 57 hr |
| Aug 26, 5:17 PM EDT | Tropical Storm Watch | GYX | 18 hr |
| Aug 27, 11:40 AM EDT | Tropical Storm Warning | GYX | 36 hr |
| Aug 28, 9:47 AM EDT | Areal Flood Warning | GYX | 12 hr |
| Aug 28, 10:24 AM EDT | Special Weather Statement | GYX | 81 min |
| Sep 5, 5:31 AM EDT | Severe Thunderstorm Warning | GYX | 44 min |
| Sep 5, 6:55 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Sep 15, 7:57 AM EDT | Severe Thunderstorm Warning | GYX | 33 min |
| Sep 16, 3:06 AM EDT | Frost Advisory | GYX | 29 hr |
| Sep 17, 2:56 PM EDT | Frost Advisory | GYX | 17 hr |
| Sep 29, 6:44 PM EDT | Special Weather Statement | GYX | 46 min |
| Oct 5, 3:14 AM EDT | Frost Advisory | GYX | 28 hr |
| Oct 6, 4:16 AM EDT | Frost Advisory | GYX | 28 hr |
| Oct 6, 1:19 PM EDT | Freeze Warning | GYX | 19 hr |
| Oct 28, 3:45 AM EDT | Winter Storm Watch | GYX | 22 hr |
| Oct 29, 1:53 AM EDT | Winter Storm Warning | GYX | 32 hr |
| Oct 29, 7:49 PM EDT | Mesoscale Discussion | SPC | 5 hr |
| Nov 22, 3:57 AM EST | Winter Storm Warning | GYX | 35 hr |
| Nov 23, 1:22 AM EST | Winter Weather Advisory | GYX | 11 hr |
| Dec 15, 3:55 PM EST | Wind Advisory | GYX | 23 hr |
| Dec 22, 9:51 PM EST | Winter Weather Advisory | GYX | 5 hr |
| Dec 30, 3:36 AM EST | Winter Weather Advisory | GYX | 35 hr |
| Dec 31, 8:33 AM EST | Mesoscale Discussion | SPC | 4 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20102012
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.