Alert archive / Massachusetts / Nantucket County
Weather alerts in Nantucket County, Massachusetts, 2023
81 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Nantucket County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 81
- Warnings
- 8
- Watches
- 8
- Advisories
- 38
- Busiest month
- September15 alerts
- Busiest day
- March 3, 20233 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Nantucket County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 1 | 1 | 0% | 1 | 100% | 30 min |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boston/Norton, MA: tornado warnings | 17 | 4 | 76% | 13 | 62% | 15 min |
| NWS Boston/Norton, MA: severe thunderstorm warnings | 92 | 67 | 27% | 263 | 70% | 30 min |
| NWS Boston/Norton, MA: flash flood warnings | 73 | 16 | 78% | 76 | 91% | 76 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 12, 3:21 PM EST | Wind Advisory | BOX | 19 hr |
| Jan 14, 3:34 AM EST | Wind Advisory | BOX | 39 hr |
| Jan 19, 4:35 AM EST | Coastal Flood Advisory | BOX | 31 hr |
| Jan 20, 2:39 PM EST | Coastal Flood Advisory | BOX | 21 hr |
| Jan 24, 2:49 PM EST | Wind Advisory | BOX | 40 hr |
| Jan 26, 7:01 AM EST | Wind Advisory | BOX | 12 hr |
| Feb 2, 3:38 AM EST | Wind Chill Warning | BOX | 57 hr |
| Feb 2, 3:38 AM EST | Wind Chill Advisory | BOX | 57 hr |
| Feb 21, 4:10 AM EST | Coastal Flood Statement | BOX | 11 hr |
| Feb 26, 2:59 PM EST | Winter Weather Advisory | BOX | 48 hr |
| Mar 3, 3:27 AM EST | Wind Advisory | BOX | 38 hr |
| Mar 3, 9:33 AM EST | Coastal Flood Advisory | BOX | 26 hr |
| Mar 3, 12:09 PM EST | High Wind Warning | BOX | 29 hr |
| Mar 13, 3:14 AM EDT | High Wind Warning | BOX | 43 hr |
| Mar 13, 3:43 PM EDT | Coastal Flood Advisory | BOX | 40 hr |
| Mar 14, 9:51 PM EDT | Wind Advisory | BOX | 17 hr |
| Apr 1, 9:49 AM EDT | Dense Fog Advisory | BOX | 119 min |
| Apr 6, 8:26 AM EDT | Dense Fog Advisory | BOX | 4 hr |
| Apr 6, 3:48 PM EDT | Fire Weather Watch | BOX | 11 hr |
| Apr 15, 9:43 PM EDT | Dense Fog Advisory | BOX | 10 hr |
| May 27, 3:45 AM EDT | Beach Hazards Statement | BOX | 16 hr |
| Jun 2, 3:12 PM EDT | High Surf Advisory | BOX | 3 days |
| Jun 3, 4:23 AM EDT | Coastal Flood Statement | BOX | 22 hr |
| Jun 4, 3:00 AM EDT | Coastal Flood Advisory | BOX | 23 hr |
| Jun 5, 2:53 AM EDT | Coastal Flood Advisory | BOX | 25 hr |
| Jun 6, 7:39 PM EDT | Coastal Flood Statement | BOX | 8 hr |
| Jun 7, 4:42 PM EDT | Coastal Flood Advisory | BOX | 14 hr |
| Jun 23, 10:31 PM EDT | Dense Fog Advisory | BOX | 8 hr |
| Jun 25, 9:31 PM EDT | Dense Fog Advisory | BOX | 12 hr |
| Jun 27, 4:29 AM EDT | Special Weather Statement | BOX | 31 min |
| Jul 14, 8:11 AM EDT | Special Weather Statement | BOX | 49 min |
| Jul 16, 8:39 PM EDT | Special Weather Statement | BOX | 96 min |
| Jul 17, 8:08 PM EDT | Dense Fog Advisory | BOX | 11 hr |
| Jul 26, 3:08 PM EDT | High Surf Advisory | BOX | 29 hr |
| Jul 27, 3:09 PM EDT | Rip Current Statement | BOX | 26 hr |
| Jul 29, 11:33 AM EDT | Mesoscale Discussion | SPC | 117 min |
| Jul 29, 1:33 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 29, 10:09 PM EDT | Special Weather Statement | BOX | 66 min |
| Jul 30, 8:44 AM EDT | Rip Current Statement | BOX | 11 hr |
| Aug 1, 2:56 AM EDT | Coastal Flood Statement | BOX | 23 hr |
| Aug 2, 3:14 AM EDT | Coastal Flood Statement | BOX | 23 hr |
| Aug 7, 1:42 PM EDT | Rip Current Statement | BOX | 28 hr |
| Aug 9, 2:37 PM EDT | Flood Watch | BOX | 26 hr |
| Aug 13, 1:44 PM EDT | Special Weather Statement | BOX | 61 min |
| Aug 13, 2:20 PM EDT | Severe Thunderstorm Warning | BOX | 40 min |
| Aug 14, 2:22 PM EDT | Flood Watch | BOX | 19 hr |
| Aug 29, 2:29 AM EDT | Rip Current Statement | BOX | 13 hr |
| Aug 29, 3:27 PM EDT | High Surf Advisory | BOX | 48 hr |
| Aug 30, 2:13 AM EDT | Dense Fog Advisory | BOX | 7 hr |
| Aug 31, 3:36 PM EDT | Rip Current Statement | BOX | 28 hr |
| Sep 11, 7:05 AM EDT | Dense Fog Advisory | BOX | 3 hr |
| Sep 12, 4:22 AM EDT | Rip Current Statement | BOX | 40 hr |
| Sep 13, 4:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Sep 13, 5:00 PM EDT | Storm Surge Watch | BOX | 24 hr |
| Sep 13, 5:00 PM EDT | Tropical Storm Watch | BOX | 24 hr |
| Sep 14, 10:58 AM EDT | Tropical Storm Warning | BOX | 48 hr |
| Sep 14, 5:43 PM EDT | Coastal Flood Warning | BOX | 39 hr |
| Sep 14, 5:43 PM EDT | High Surf Advisory | BOX | 58 hr |
| Sep 16, 9:04 AM EDT | Coastal Flood Advisory | BOX | 6 hr |
| Sep 17, 3:54 AM EDT | Rip Current Statement | BOX | 16 hr |
| Sep 19, 5:16 AM EDT | Rip Current Statement | BOX | 14 hr |
| Sep 20, 3:44 PM EDT | High Surf Advisory | BOX | 27 hr |
| Sep 21, 3:34 PM EDT | Rip Current Statement | BOX | 12 hr |
| Sep 23, 3:44 AM EDT | Rip Current Statement | BOX | 16 hr |
| Sep 29, 2:12 PM EDT | Coastal Flood Statement | BOX | 13 hr |
| Oct 5, 3:27 AM EDT | Dense Fog Advisory | BOX | 7 hr |
| Oct 5, 3:32 PM EDT | Dense Fog Advisory | BOX | 19 hr |
| Oct 7, 2:01 AM EDT | Coastal Flood Advisory | BOX | 20 hr |
| Oct 14, 3:47 PM EDT | Coastal Flood Statement | BOX | 24 hr |
| Oct 20, 3:37 PM EDT | Wind Advisory | BOX | 38 hr |
| Oct 31, 2:15 PM EDT | Coastal Flood Statement | BOX | 28 hr |
| Nov 21, 3:09 AM EST | Wind Advisory | BOX | 35 hr |
| Nov 26, 2:28 AM EST | Wind Advisory | BOX | 28 hr |
| Dec 8, 2:30 PM EST | High Wind Watch | BOX | 38 hr |
| Dec 10, 4:08 AM EST | High Wind Warning | BOX | 29 hr |
| Dec 16, 4:10 AM EST | High Wind Watch | BOX | 23 hr |
| Dec 17, 2:59 AM EST | High Wind Warning | BOX | 37 hr |
| Dec 18, 10:57 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 18, 3:29 PM EST | Wind Advisory | BOX | 4 hr |
| Dec 25, 7:01 PM EST | Dense Fog Advisory | BOX | 18 hr |
| Dec 26, 7:22 PM EST | Dense Fog Advisory | BOX | 12 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 | 1 |
| Severe Thunderstorm Watch | 1 |
| Mesoscale Discussion | 3 |
| Special Weather Statement | 5 |
| Flooding | |
| Flood Watch | 2 |
| Winter | |
| Winter Weather Advisory | 1 |
| Cold | |
| Wind Chill Warning | 1 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 4 |
| High Wind Watch | 2 |
| Wind Advisory | 10 |
| Fire | |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 12 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Storm Surge Watch | 1 |
| Tropical Storm Watch | 1 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| Coastal Flood Advisory | 9 |
| High Surf Advisory | 5 |
| Beach Hazards Statement | 1 |
| Coastal Flood Statement | 8 |
| Rip Current Statement | 10 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20222024
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.