Alert archive / Massachusetts / Nantucket County
Weather alerts in Nantucket County, Massachusetts, 2019
100 weather alerts in 2019, 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 2019. Tap one for its archive.
- Alerts
- 100
- Warnings
- 17
- Watches
- 15
- Advisories
- 49
- Busiest month
- October22 alerts
- Busiest day
- August 8, 20194 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, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 4 | 0 | 100% | 1 | 0% | |
| Flash flood warnings | 0 | 0 |
Each office's whole area, 2019
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boston/Norton, MA: tornado warnings | 13 | 2 | 85% | 7 | 86% | 23 min |
| NWS Boston/Norton, MA: severe thunderstorm warnings | 120 | 68 | 43% | 336 | 63% | 23 min |
| NWS Boston/Norton, MA: flash flood warnings | 12 | 1 | 92% | 1 | 100% | 47 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, 6:01 PM EST | Dense Fog Advisory | BOX | 10 hr |
| Jan 9, 4:17 AM EST | Dense Fog Advisory | BOX | 3 hr |
| Jan 9, 4:17 AM EST | Wind Advisory | BOX | 12 hr |
| Jan 17, 1:53 PM EST | Coastal Flood Watch | BOX | 25 hr |
| Jan 18, 3:02 PM EST | Coastal Flood Advisory | BOX | 45 hr |
| Jan 19, 3:38 PM EST | Wind Advisory | BOX | 20 hr |
| Jan 20, 10:57 AM EST | Special Weather Statement | BOX | 63 min |
| Jan 20, 11:16 AM EST | High Wind Warning | BOX | 4 hr |
| Jan 20, 3:20 PM EST | Coastal Flood Statement | BOX | 21 hr |
| Jan 23, 3:53 AM EST | High Wind Watch | BOX | 11 hr |
| Jan 23, 3:08 PM EST | High Wind Warning | BOX | 26 hr |
| Jan 24, 5:07 PM EST | Wind Advisory | BOX | 113 min |
| Jan 29, 4:11 AM EST | High Wind Watch | BOX | 23 hr |
| Jan 30, 3:21 AM EST | High Wind Warning | BOX | 19 hr |
| Feb 4, 9:55 PM EST | Dense Fog Advisory | BOX | 9 hr |
| Feb 8, 3:29 AM EST | Wind Advisory | BOX | 35 hr |
| Feb 17, 3:48 AM EST | Winter Weather Advisory | BOX | 35 hr |
| Feb 23, 3:37 AM EST | High Wind Watch | BOX | 25 hr |
| Feb 24, 4:07 AM EST | High Wind Warning | BOX | 39 hr |
| Feb 25, 7:01 PM EST | Wind Advisory | BOX | 20 hr |
| Feb 26, 3:34 PM EST | Winter Weather Advisory | BOX | 42 hr |
| Mar 22, 3:16 PM EDT | Wind Advisory | BOX | 24 hr |
| Apr 2, 2:54 PM EDT | Wind Advisory | BOX | 21 hr |
| Apr 4, 4:12 AM EDT | Red Flag Warning | BOX | 15 hr |
| Apr 13, 7:16 PM EDT | Dense Fog Advisory | BOX | 14 hr |
| Apr 14, 3:00 AM EDT | Wind Advisory | BOX | 49 hr |
| Apr 14, 9:05 PM EDT | Dense Fog Advisory | BOX | 9 hr |
| May 13, 4:36 PM EDT | Coastal Flood Statement | BOX | 17 hr |
| May 24, 8:44 AM EDT | Wind Advisory | BOX | 12 hr |
| Jun 1, 4:10 AM EDT | Dense Fog Advisory | BOX | 5 hr |
| Jun 1, 11:12 PM EDT | Dense Fog Advisory | BOX | 9 hr |
| Jun 20, 4:00 PM EDT | Dense Fog Advisory | BOX | 17 hr |
| Jun 22, 2:44 PM EDT | Special Weather Statement | BOX | 46 min |
| Jun 22, 3:35 PM EDT | Special Weather Statement | BOX | 40 min |
| Jun 25, 7:55 AM EDT | Dense Fog Advisory | BOX | 3 hr |
| Jun 30, 4:59 PM EDT | Severe Thunderstorm Warning | BOX | 27 min |
| Jul 5, 11:45 PM EDT | Dense Fog Advisory | BOX | 7 hr |
| Jul 11, 1:48 AM EDT | Dense Fog Advisory | BOX | 7 hr |
| Jul 12, 8:25 AM EDT | Special Weather Statement | BOX | 35 min |
| Jul 23, 3:27 AM EDT | Flash Flood Watch | BOX | 10 hr |
| Jul 31, 1:17 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 8, 3:48 AM EDT | Severe Thunderstorm Warning | BOX | 42 min |
| Aug 8, 4:25 AM EDT | Severe Thunderstorm Warning | BOX | 65 min |
| Aug 8, 5:05 AM EDT | Special Weather Statement | BOX | 25 min |
| Aug 8, 5:10 AM EDT | Severe Thunderstorm Warning | BOX | 21 min |
| Aug 13, 3:01 PM EDT | Special Weather Statement | BOX | 89 min |
| Aug 13, 3:44 PM EDT | Areal Flood Warning | BOX | 2 hr |
| Aug 18, 3:03 AM EDT | Dense Fog Advisory | BOX | 6 hr |
| Aug 21, 10:06 AM EDT | Special Weather Statement | BOX | 84 min |
| Aug 21, 1:53 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 26, 11:26 AM EDT | Rip Current Statement | BOX | 7 hr |
| Aug 27, 2:55 AM EDT | Rip Current Statement | BOX | 15 hr |
| Aug 28, 2:53 AM EDT | Flash Flood Watch | BOX | 28 hr |
| Sep 5, 5:00 AM EDT | Tropical Storm Watch | BOX | 12 hr |
| Sep 5, 5:04 PM EDT | Tropical Storm Warning | BOX | 42 hr |
| Sep 6, 4:54 AM EDT | High Surf Advisory | BOX | 47 hr |
| Sep 8, 3:36 AM EDT | Rip Current Statement | BOX | 13 hr |
| Sep 18, 3:51 AM EDT | Rip Current Statement | BOX | 20 hr |
| Sep 18, 3:34 PM EDT | High Surf Advisory | BOX | 53 hr |
| Sep 21, 3:42 AM EDT | Rip Current Statement | BOX | 16 hr |
| Sep 22, 4:31 PM EDT | Rip Current Statement | BOX | 3 days |
| Sep 29, 3:53 AM EDT | Rip Current Statement | BOX | 4 days |
| Oct 8, 2:48 PM EDT | Coastal Flood Watch | BOX | 37 hr |
| Oct 8, 3:57 PM EDT | High Wind Watch | BOX | 11 hr |
| Oct 9, 3:16 AM EDT | High Wind Warning | BOX | 42 hr |
| Oct 9, 3:16 AM EDT | Wind Advisory | BOX | 69 hr |
| Oct 9, 3:28 AM EDT | Coastal Flood Advisory | BOX | 33 hr |
| Oct 9, 3:36 AM EDT | Flood Watch | BOX | 42 hr |
| Oct 10, 3:30 AM EDT | Coastal Flood Warning | BOX | 22 hr |
| Oct 11, 2:43 AM EDT | Coastal Flood Advisory | BOX | 10 hr |
| Oct 11, 3:58 PM EDT | Coastal Flood Advisory | BOX | 10 hr |
| Oct 16, 4:23 AM EDT | High Wind Watch | BOX | 11 hr |
| Oct 16, 4:23 AM EDT | Wind Advisory | BOX | 38 hr |
| Oct 16, 3:46 PM EDT | High Wind Warning | BOX | 14 hr |
| Oct 17, 8:14 AM EDT | High Wind Warning | BOX | 10 hr |
| Oct 17, 6:20 PM EDT | Wind Advisory | BOX | 3 hr |
| Oct 23, 6:35 AM EDT | Dense Fog Advisory | BOX | 2 hr |
| Oct 26, 3:40 PM EDT | Wind Advisory | BOX | 30 hr |
| Oct 27, 4:22 PM EDT | Coastal Flood Advisory | BOX | 23 hr |
| Oct 28, 4:30 PM EDT | Coastal Flood Advisory | BOX | 10 hr |
| Oct 29, 8:02 AM EDT | Coastal Flood Statement | BOX | 7 hr |
| Oct 30, 3:42 AM EDT | High Wind Watch | BOX | 24 hr |
| Oct 30, 3:34 PM EDT | Wind Advisory | BOX | 47 hr |
| Oct 31, 4:08 AM EDT | High Wind Warning | BOX | 27 hr |
| Nov 17, 3:17 AM EST | Wind Advisory | BOX | 38 hr |
| Nov 17, 3:21 AM EST | Coastal Flood Advisory | BOX | 38 hr |
| Nov 23, 3:48 PM EST | Wind Advisory | BOX | 30 hr |
| Nov 28, 3:04 AM EST | Wind Advisory | BOX | 21 hr |
| Nov 29, 4:23 AM EST | Coastal Flood Statement | BOX | 13 hr |
| Dec 1, 8:22 PM EST | Coastal Flood Advisory | BOX | 21 hr |
| Dec 2, 4:24 AM EST | Wind Advisory | BOX | 9 hr |
| Dec 2, 7:33 PM EST | Wind Advisory | BOX | 14 hr |
| Dec 3, 3:11 AM EST | Coastal Flood Advisory | BOX | 6 hr |
| Dec 13, 2:46 AM EST | Flood Watch | BOX | 31 hr |
| Dec 13, 2:49 AM EST | Wind Advisory | BOX | 34 hr |
| Dec 13, 4:40 PM EST | Coastal Flood Statement | BOX | 21 hr |
| Dec 14, 2:09 AM EST | High Wind Warning | BOX | 8 hr |
| Dec 14, 3:30 PM EST | Wind Advisory | BOX | 28 hr |
| Dec 14, 4:04 PM EST | Dense Fog Advisory | BOX | 2 hr |
| Dec 18, 4:12 AM EST | Wind Advisory | BOX | 29 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 | 4 |
| Severe Thunderstorm Watch | 2 |
| Special Weather Statement | 7 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Watch | 2 |
| Flood Watch | 2 |
| Winter | |
| Winter Weather Advisory | 2 |
| Wind and dust | |
| High Wind Warning | 9 |
| High Wind Watch | 6 |
| Wind Advisory | 22 |
| Fire | |
| Red Flag Warning | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 14 |
| Tropical | |
| Tropical Storm Warning | 1 |
| Tropical Storm Watch | 1 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 9 |
| High Surf Advisory | 2 |
| Coastal Flood Statement | 5 |
| Rip Current Statement | 7 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20182020
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.