Alert archive / New Hampshire / Rockingham County
Weather alerts in Rockingham County, New Hampshire, 2021
166 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Rockingham County and its neighbors
Each county as a circle sized by its count in 2021. Tap one for its archive.
- Alerts
- 166
- Warnings
- 26
- Watches
- 13
- Advisories
- 55
- Busiest month
- July42 alerts
- Busiest day
- June 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.
Rockingham County, 2021
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 15 | 11 | 27% | 13 | 85% | 16 min |
| Flash flood warnings | 4 | 2 | 50% | 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 13, 3:32 PM EST | Coastal Flood Statement | GYX | 22 hr |
| Jan 15, 4:00 PM EST | Wind Advisory | GYX | 24 hr |
| Jan 15, 4:04 PM EST | Coastal Flood Watch | GYX | 11 hr |
| Jan 16, 3:22 AM EST | Coastal Flood Warning | GYX | 13 hr |
| Jan 16, 3:22 AM EST | Coastal Flood Advisory | GYX | 13 hr |
| 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 |
| Jan 31, 3:56 PM EST | Coastal Flood Watch | GYX | 23 hr |
| Feb 1, 3:14 PM EST | Coastal Flood Warning | GYX | 24 hr |
| Feb 1, 7:27 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Feb 2, 3:23 AM EST | Coastal Flood Warning | GYX | 97 min |
| Feb 2, 8:41 AM EST | Winter Weather Advisory | GYX | 10 hr |
| Feb 2, 3:43 PM EST | Coastal Flood Advisory | GYX | 13 hr |
| Feb 6, 2:48 AM EST | Winter Storm Watch | GYX | 13 hr |
| Feb 6, 3:18 PM EST | Winter Weather Advisory | GYX | 33 hr |
| Feb 8, 3:22 PM EST | Winter Weather Advisory | GYX | 27 hr |
| Feb 15, 3:59 AM EST | Winter Weather Advisory | GYX | 33 hr |
| Mar 1, 3:23 AM EST | Wind Advisory | GYX | 37 hr |
| Mar 1, 8:22 AM EST | Coastal Flood Statement | GYX | 6 hr |
| Mar 12, 3:18 AM EST | Wind Advisory | GYX | 31 hr |
| Mar 14, 1:18 PM EDT | Special Weather Statement | GYX | 42 min |
| Mar 14, 1:54 PM EDT | Special Weather Statement | GYX | 51 min |
| Mar 14, 1:57 PM EDT | Special Weather Statement | GYX | 48 min |
| Mar 25, 8:46 PM EDT | Dense Fog Advisory | GYX | 15 hr |
| Mar 28, 3:28 AM EDT | Wind Advisory | GYX | 38 hr |
| Mar 28, 3:36 PM EDT | Coastal Flood Advisory | GYX | 9 hr |
| Apr 16, 3:17 AM EDT | Wind Advisory | GYX | 17 hr |
| Apr 21, 2:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Apr 21, 5:39 PM EDT | Special Weather Statement | GYX | 66 min |
| Apr 28, 3:00 PM EDT | Coastal Flood Advisory | GYX | 10 hr |
| Apr 29, 3:31 PM EDT | Coastal Flood Advisory | GYX | 10 hr |
| May 1, 3:29 PM EDT | Beach Hazards Statement | GYX | 29 hr |
| May 14, 3:31 PM EDT | Beach Hazards Statement | GYX | 28 hr |
| May 15, 8:09 PM EDT | Beach Hazards Statement | GYX | 24 hr |
| May 21, 3:31 PM EDT | Beach Hazards Statement | GYX | 28 hr |
| May 22, 3:39 PM EDT | Coastal Flood Advisory | GYX | 5 hr |
| May 22, 9:11 PM EDT | Beach Hazards Statement | GYX | 23 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, 5:58 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 |
| May 29, 6:43 PM EDT | Coastal Flood Statement | GYX | 9 hr |
| May 30, 3:20 AM EDT | High Surf Advisory | GYX | 17 hr |
| Jun 4, 3:23 PM EDT | Beach Hazards Statement | GYX | 28 hr |
| Jun 5, 6:56 PM EDT | Beach Hazards Statement | GYX | 24 hr |
| Jun 6, 3:11 AM EDT | Heat Advisory | GYX | 63 hr |
| Jun 8, 6:24 PM EDT | Areal Flood Advisory | GYX | 115 min |
| Jun 12, 3:31 PM EDT | Beach Hazards Statement | GYX | 27 hr |
| Jun 15, 2:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 15, 4:24 PM EDT | Special Weather Statement | GYX | 51 min |
| Jun 15, 4:36 PM EDT | Severe Thunderstorm Warning | GYX | 39 min |
| Jun 15, 4:55 PM EDT | Special Weather Statement | BOX | 65 min |
| Jun 15, 5:14 PM EDT | Severe Thunderstorm Warning | GYX | 33 min |
| Jun 15, 6:03 PM EDT | Special Weather Statement | GYX | 42 min |
| Jun 15, 6:28 PM EDT | Special Weather Statement | GYX | 47 min |
| Jun 15, 7:01 PM EDT | Special Weather Statement | GYX | 44 min |
| Jun 20, 4:06 AM EDT | Beach Hazards Statement | GYX | 15 hr |
| Jun 26, 3:25 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 26, 3:28 PM EDT | Beach Hazards Statement | GYX | 28 hr |
| Jun 27, 3:37 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 28, 4:13 PM EDT | Heat Advisory | GYX | 28 hr |
| Jun 29, 2:30 PM EDT | Heat Advisory | GYX | 28 hr |
| 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, 4:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 30, 4:53 PM EDT | Special Weather Statement | GYX | 37 min |
| Jun 30, 4:58 PM EDT | Severe Thunderstorm Warning | GYX | 32 min |
| Jun 30, 5:12 PM EDT | Severe Thunderstorm Warning | GYX | 33 min |
| Jul 2, 3:24 PM EDT | High Surf Advisory | GYX | 6 hr |
| Jul 4, 12:11 AM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 4, 3:48 PM EDT | Beach Hazards Statement | GYX | 28 hr |
| Jul 6, 5:07 PM EDT | Special Weather Statement | GYX | 23 min |
| Jul 7, 4:21 PM EDT | Special Weather Statement | GYX | 24 min |
| Jul 7, 4:36 PM EDT | Severe Thunderstorm Warning | GYX | 11 min |
| Jul 8, 4:09 AM EDT | Flash Flood Watch | GYX | 39 hr |
| Jul 8, 2:35 PM EDT | High Surf Advisory | GYX | 44 hr |
| Jul 9, 1:01 PM EDT | Flash Flood Warning | GYX | 4 hr |
| Jul 11, 3:15 PM EDT | Flash Flood Watch | GYX | 22 hr |
| Jul 14, 7:12 AM EDT | Dense Fog Advisory | GYX | 53 min |
| Jul 14, 8:05 AM EDT | Dense Fog Advisory | GYX | 3 hr |
| Jul 14, 3:11 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 14, 8:33 PM EDT | Dense Fog Advisory | GYX | 12 hr |
| Jul 16, 3:19 AM EDT | Heat Advisory | GYX | 15 hr |
| Jul 18, 5:56 AM EDT | Special Weather Statement | GYX | 34 min |
| Jul 18, 6:34 AM EDT | Special Weather Statement | GYX | 26 min |
| Jul 18, 7:59 AM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 20, 10:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jul 20, 10:15 PM EDT | Special Weather Statement | GYX | 45 min |
| Jul 20, 11:10 PM EDT | Special Weather Statement | GYX | 35 min |
| Jul 20, 11:28 PM EDT | Severe Thunderstorm Warning | GYX | 47 min |
| Jul 20, 11:42 PM EDT | Special Weather Statement | GYX | 48 min |
| Jul 20, 11:55 PM EDT | Severe Thunderstorm Warning | GYX | 25 min |
| Jul 21, 12:06 AM EDT | Special Weather Statement | GYX | 24 min |
| Jul 21, 12:13 AM EDT | Severe Thunderstorm Warning | GYX | 30 min |
| Jul 23, 2:13 PM EDT | Severe Thunderstorm Warning | GYX | 27 min |
| Jul 23, 3:38 PM EDT | Severe Thunderstorm Warning | GYX | 21 min |
| Jul 23, 3:39 PM EDT | Coastal Flood Statement | GYX | 10 hr |
| Jul 23, 4:27 PM EDT | Special Weather Statement | GYX | 33 min |
| Jul 23, 4:38 PM EDT | Severe Thunderstorm Warning | GYX | 18 min |
| Jul 23, 4:43 PM EDT | Severe Thunderstorm Warning | GYX | 47 min |
| Jul 23, 5:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jul 27, 6:00 PM EDT | Special Weather Statement | GYX | 30 min |
| Jul 27, 6:30 PM EDT | Special Weather Statement | GYX | 30 min |
| Jul 27, 6:36 PM EDT | Severe Thunderstorm Warning | GYX | 39 min |
| Jul 27, 6:54 PM EDT | Areal Flood Advisory | GYX | 111 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 |
| Jul 29, 9:57 PM EDT | Special Weather Statement | GYX | 48 min |
| Jul 29, 10:36 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 29, 10:58 PM EDT | Flash Flood Warning | GYX | 3 hr |
| Aug 9, 3:31 PM EDT | Dense Fog Advisory | GYX | 15 hr |
| Aug 10, 3:15 AM EDT | Heat Advisory | GYX | 4 days |
| Aug 12, 3:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 12, 5:50 PM EDT | Special Weather Statement | GYX | 55 min |
| Aug 12, 6:44 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Aug 18, 3:02 PM EDT | Flash Flood Watch | GYX | 31 hr |
| Aug 19, 2:41 PM EDT | Special Weather Statement | GYX | 34 min |
| Aug 19, 3:46 PM EDT | Flash Flood Warning | GYX | 119 min |
| Aug 21, 8:59 PM EDT | Dense Fog Advisory | GYX | 11 hr |
| Aug 22, 3:52 AM EDT | High Surf Advisory | GYX | 23 hr |
| Aug 22, 4:10 PM EDT | Coastal Flood Statement | GYX | 10 hr |
| Aug 23, 6:06 AM EDT | Dense Fog Advisory | GYX | 3 hr |
| Aug 25, 3:13 PM EDT | Heat Advisory | GYX | 29 hr |
| Sep 1, 3:35 AM EDT | Flash Flood Watch | GYX | 29 hr |
| Sep 2, 3:49 AM EDT | Areal Flood Advisory | GYX | 5 hr |
| Sep 8, 2:07 PM EDT | Coastal Flood Statement | GYX | 12 hr |
| Sep 8, 2:07 PM EDT | High Surf Advisory | GYX | 3 days |
| Sep 9, 4:12 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 9, 4:02 PM EDT | Coastal Flood Statement | GYX | 11 hr |
| Sep 10, 3:08 AM EDT | Coastal Flood Statement | GYX | 12 hr |
| Sep 10, 10:09 PM EDT | Coastal Flood Statement | GYX | 6 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 17, 11:50 PM EDT | Dense Fog Advisory | GYX | 9 hr |
| Sep 19, 3:29 AM EDT | Rip Current Statement | GYX | 15 hr |
| Oct 11, 2:29 PM EDT | Dense Fog Advisory | GYX | 19 hr |
| Oct 16, 5:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 26, 3:45 AM EDT | Wind Advisory | GYX | 38 hr |
| Oct 26, 10:29 AM EDT | Coastal Flood Advisory | GYX | 31 hr |
| Oct 26, 2:31 PM EDT | High Wind Warning | GYX | 21 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 5, 7:33 AM EDT | Coastal Flood Statement | GYX | 6 hr |
| Nov 6, 6:53 AM EDT | Coastal Flood Statement | GYX | 8 hr |
| Nov 8, 4:01 AM EST | Coastal Flood Statement | GYX | 11 hr |
| Nov 11, 2:52 PM EST | Wind Advisory | GYX | 29 hr |
| Nov 12, 9:17 AM EST | Coastal Flood Statement | GYX | 10 hr |
| Nov 12, 2:05 PM EST | Special Weather Statement | GYX | 55 min |
| Dec 5, 3:30 PM EST | Coastal Flood Statement | GYX | 23 hr |
| Dec 6, 9:40 AM EST | Coastal Flood Advisory | GYX | 4 hr |
| Dec 6, 9:10 PM EST | Special Weather Statement | GYX | 50 min |
| Dec 10, 4:32 PM EST | Winter Weather Advisory | GYX | 26 hr |
| Dec 11, 9:49 PM EST | Mesoscale Discussion | SPC | 116 min |
| Dec 11, 10:50 PM EST | Special Weather Statement | GYX | 40 min |
| Dec 11, 11:36 PM EST | Special Weather Statement | GYX | 54 min |
| 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 17, 3:34 PM EST | Winter Weather Advisory | GYX | 45 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 | 15 |
| Severe Thunderstorm Watch | 3 |
| Mesoscale Discussion | 18 |
| Special Weather Statement | 28 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 4 |
| Flash Flood Watch | 5 |
| Areal Flood Advisory | 8 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 9 |
| Heat | |
| Heat Advisory | 8 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 8 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
| Coast and beach | |
| Coastal Flood Warning | 3 |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 8 |
| High Surf Advisory | 5 |
| Beach Hazards Statement | 11 |
| Coastal Flood Statement | 14 |
| Rip Current Statement | 1 |
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.