Alert archive / New Hampshire / Sullivan County
Weather alerts in Sullivan County, New Hampshire, 2020
131 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Sullivan County and its neighbors
Each county as a circle sized by its count in 2020. Tap one for its archive.
- Alerts
- 131
- Warnings
- 24
- Watches
- 12
- Advisories
- 30
- Busiest month
- August31 alerts
- Busiest day
- August 24, 20207 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 3 tornado warnings covering Sullivan County in 2020 had a tornado report inside them.
Sullivan County, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 10 | 8 | 20% | 8 | 100% | 16 min |
| Flash flood warnings | 2 | 0 | 100% | 0 |
Each office's whole area, 2020
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Gray, ME: tornado warnings | 8 | 2 | 75% | 4 | 50% | 4 min |
| NWS Gray, ME: severe thunderstorm warnings | 158 | 112 | 29% | 277 | 87% | 20 min |
| NWS Gray, ME: flash flood warnings | 26 | 9 | 65% | 14 | 93% | 39 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 8, 3:29 PM EST | Special Weather Statement | GYX | 46 min |
| Jan 11, 9:34 PM EST | Wind Advisory | GYX | 18 hr |
| Jan 13, 3:48 PM EST | Winter Weather Advisory | GYX | 6 hr |
| Jan 15, 3:05 AM EST | Winter Weather Advisory | GYX | 38 hr |
| Jan 17, 2:55 PM EST | Winter Storm Watch | GYX | 12 hr |
| Jan 18, 3:16 AM EST | Winter Weather Advisory | GYX | 28 hr |
| Feb 5, 3:54 AM EST | Winter Weather Advisory | GYX | 66 hr |
| Feb 11, 3:56 AM EST | Dense Fog Advisory | GYX | 2 hr |
| Feb 12, 2:56 AM EST | Winter Weather Advisory | GYX | 33 hr |
| Mar 3, 2:51 PM EST | Wind Advisory | GYX | 27 hr |
| Mar 13, 2:25 PM EDT | Special Weather Statement | GYX | 2 hr |
| Mar 22, 3:36 AM EDT | Winter Storm Watch | GYX | 24 hr |
| Mar 23, 3:50 AM EDT | Winter Storm Warning | GYX | 24 hr |
| Mar 23, 3:26 PM EDT | Mesoscale Discussion | SPC | 6 hr |
| Mar 29, 7:20 PM EDT | Special Weather Statement | GYX | 40 min |
| Mar 29, 9:00 PM EDT | Special Weather Statement | GYX | 60 min |
| Apr 8, 3:34 PM EDT | Wind Advisory | GYX | 32 hr |
| Apr 12, 3:19 PM EDT | Wind Advisory | GYX | 31 hr |
| Apr 13, 2:42 PM EDT | Mesoscale Discussion | SPC | 93 min |
| Apr 26, 3:41 AM EDT | Winter Weather Advisory | GYX | 36 hr |
| May 7, 9:41 PM EDT | Special Weather Statement | GYX | 49 min |
| May 11, 12:56 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 12, 3:21 PM EDT | Freeze Warning | GYX | 15 hr |
| May 13, 2:54 PM EDT | Freeze Warning | GYX | 16 hr |
| May 15, 3:32 PM EDT | Tornado Watch | SPC | 6 hr |
| May 15, 4:58 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 15, 6:47 PM EDT | Severe Thunderstorm Warning | GYX | 58 min |
| May 15, 6:53 PM EDT | Special Weather Statement | GYX | 37 min |
| May 15, 7:16 PM EDT | Severe Thunderstorm Warning | GYX | 44 min |
| May 15, 7:37 PM EDT | Severe Thunderstorm Warning | GYX | 53 min |
| May 29, 8:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| May 29, 8:15 PM EDT | Special Weather Statement | GYX | 45 min |
| May 29, 9:33 PM EDT | Special Weather Statement | GYX | 42 min |
| May 31, 2:56 PM EDT | Frost Advisory | GYX | 15 hr |
| Jun 6, 10:36 AM EDT | Special Weather Statement | GYX | 39 min |
| Jun 6, 10:37 AM EDT | Special Weather Statement | GYX | 38 min |
| Jun 6, 10:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Jun 6, 12:23 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 6, 2:06 PM EDT | Severe Thunderstorm Warning | GYX | 39 min |
| Jun 6, 8:02 PM EDT | Special Weather Statement | GYX | 28 min |
| Jun 20, 3:14 PM EDT | Special Weather Statement | GYX | 46 min |
| Jun 20, 3:38 PM EDT | Severe Thunderstorm Warning | GYX | 20 min |
| Jun 22, 2:36 PM EDT | Special Weather Statement | GYX | 24 min |
| Jun 22, 3:00 PM EDT | Special Weather Statement | GYX | 30 min |
| Jun 22, 3:17 PM EDT | Severe Thunderstorm Warning | GYX | 32 min |
| Jun 22, 3:46 PM EDT | Areal Flood Advisory | GYX | 2 hr |
| Jun 28, 12:37 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jun 28, 1:28 PM EDT | Special Weather Statement | GYX | 62 min |
| Jun 28, 4:13 PM EDT | Special Weather Statement | GYX | 32 min |
| Jun 28, 11:01 PM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jun 29, 1:53 PM EDT | Special Weather Statement | GYX | 112 min |
| Jul 2, 6:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 6:21 PM EDT | Special Weather Statement | GYX | 39 min |
| Jul 5, 6:58 PM EDT | Special Weather Statement | GYX | 47 min |
| Jul 5, 7:18 PM EDT | Severe Thunderstorm Warning | GYX | 42 min |
| Jul 5, 7:48 PM EDT | Special Weather Statement | GYX | 27 min |
| Jul 5, 8:13 PM EDT | Special Weather Statement | GYX | 32 min |
| Jul 8, 1:01 PM EDT | Mesoscale Discussion | SPC | 119 min |
| Jul 8, 2:00 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 8, 2:19 PM EDT | Severe Thunderstorm Warning | GYX | 56 min |
| Jul 8, 2:36 PM EDT | Flash Flood Warning | GYX | 114 min |
| Jul 8, 4:24 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jul 9, 2:18 AM EDT | Dense Fog Advisory | GYX | 7 hr |
| Jul 11, 12:26 PM EDT | Heat Advisory | GYX | 6 hr |
| Jul 13, 9:03 PM EDT | Special Weather Statement | GYX | 42 min |
| Jul 14, 3:53 AM EDT | Special Weather Statement | GYX | 37 min |
| Jul 14, 4:19 AM EDT | Severe Thunderstorm Warning | GYX | 41 min |
| Jul 14, 5:18 AM EDT | Special Weather Statement | GYX | 27 min |
| Jul 14, 5:26 AM EDT | Areal Flood Advisory | GYX | 3 hr |
| Jul 18, 3:27 AM EDT | Dense Fog Advisory | GYX | 4 hr |
| Jul 18, 7:02 AM EDT | Dense Fog Advisory | GYX | 58 min |
| Jul 18, 10:30 AM EDT | Heat Advisory | GYX | 57 hr |
| Jul 23, 12:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 23, 4:28 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 23, 4:41 PM EDT | Special Weather Statement | GYX | 34 min |
| Jul 26, 7:52 PM EDT | Heat Advisory | GYX | 24 hr |
| Jul 30, 1:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 3, 5:41 AM EDT | Tropical Storm Watch | GYX | 35 hr |
| Aug 3, 1:57 PM EDT | Flash Flood Watch | GYX | 32 hr |
| Aug 3, 5:33 PM EDT | Tropical Storm Warning | GYX | 33 hr |
| Aug 4, 9:22 AM EDT | Tornado Warning | GYX | 23 min |
| Aug 4, 9:54 AM EDT | Special Weather Statement | GYX | 66 min |
| Aug 4, 10:25 AM EDT | Special Weather Statement | GYX | 35 min |
| Aug 4, 12:43 PM EDT | Tornado Watch | SPC | 6 hr |
| Aug 4, 2:49 PM EDT | Tornado Warning | GYX | 26 min |
| Aug 4, 3:11 PM EDT | Tornado Warning | GYX | 22 min |
| Aug 8, 7:11 AM EDT | Special Weather Statement | GYX | 49 min |
| Aug 8, 7:57 AM EDT | Special Weather Statement | GYX | 48 min |
| Aug 8, 8:54 AM EDT | Special Weather Statement | GYX | 51 min |
| Aug 10, 3:27 PM EDT | Heat Advisory | GYX | 29 hr |
| Aug 21, 2:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 21, 5:11 PM EDT | Special Weather Statement | GYX | 34 min |
| Aug 22, 1:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 23, 2:08 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 23, 8:37 PM EDT | Special Weather Statement | GYX | 38 min |
| Aug 23, 8:40 PM EDT | Severe Thunderstorm Warning | GYX | 50 min |
| Aug 23, 9:14 PM EDT | Special Weather Statement | GYX | 46 min |
| Aug 23, 10:17 PM EDT | Special Weather Statement | GYX | 58 min |
| Aug 23, 10:48 PM EDT | Areal Flood Advisory | GYX | 117 min |
| Aug 24, 2:00 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 2:33 PM EDT | Special Weather Statement | GYX | 42 min |
| Aug 25, 2:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 25, 3:12 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 25, 4:25 PM EDT | Special Weather Statement | BTV | 20 min |
| Aug 25, 4:46 PM EDT | Special Weather Statement | GYX | 29 min |
| Aug 29, 1:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Aug 29, 6:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 29, 9:03 PM EDT | Special Weather Statement | GYX | 27 min |
| Sep 18, 2:44 PM EDT | Frost Advisory | GYX | 16 hr |
| Sep 19, 3:02 PM EDT | Freeze Warning | GYX | 16 hr |
| Sep 26, 4:40 AM EDT | Dense Fog Advisory | GYX | 4 hr |
| Sep 30, 5:56 AM EDT | Special Weather Statement | GYX | 64 min |
| Oct 7, 4:12 AM EDT | Wind Advisory | GYX | 17 hr |
| Oct 10, 8:14 PM EDT | Special Weather Statement | GYX | 46 min |
| Oct 29, 4:10 AM EDT | Winter Weather Advisory | GYX | 30 hr |
| Nov 1, 7:58 PM EST | Wind Advisory | GYX | 23 hr |
| Nov 15, 9:46 PM EST | Special Weather Statement | GYX | 44 min |
| Nov 30, 8:26 PM EST | Flash Flood Warning | GYX | 3 hr |
| Dec 3, 3:57 PM EST | Winter Storm Watch | GYX | 36 hr |
| Dec 4, 4:06 PM EST | Winter Storm Warning | GYX | 42 hr |
| Dec 13, 6:10 AM EST | Dense Fog Advisory | GYX | 5 hr |
| Dec 15, 4:04 PM EST | Winter Storm Watch | GYX | 11 hr |
| Dec 16, 3:28 AM EST | Winter Storm Warning | GYX | 39 hr |
| Dec 16, 10:12 PM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 17, 4:33 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Dec 17, 10:05 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 17, 10:26 AM EST | Special Weather Statement | GYX | 64 min |
| Dec 23, 1:50 PM EST | Flood Watch | GYX | 60 hr |
| Dec 24, 3:39 PM EST | Wind Advisory | GYX | 24 hr |
| Dec 25, 12:03 PM EST | River Flood Warning | GYX | 6 hr |
| Dec 25, 2:58 PM EST | Areal Flood Warning | GYX | 4 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 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 2 |
| Mesoscale Discussion | 23 |
| Special Weather Statement | 42 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| River Flood Warning | 1 |
| Flash Flood Watch | 1 |
| Flood Watch | 1 |
| Areal Flood Advisory | 4 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 4 |
| Winter Weather Advisory | 7 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 3 |
| Frost Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 7 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Tropical Storm Watch | 1 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
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.