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

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings110%1100%30 min
Flash flood warnings00

Each office's whole area, 2023

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boston/Norton, MA: tornado warnings17476%1362%15 min
NWS Boston/Norton, MA: severe thunderstorm warnings926727%26370%30 min
NWS Boston/Norton, MA: flash flood warnings731678%7691%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.

IssuedProductOfficeLasted
Jan 12, 3:21 PM ESTWind AdvisoryBOX19 hr
Jan 14, 3:34 AM ESTWind AdvisoryBOX39 hr
Jan 19, 4:35 AM ESTCoastal Flood AdvisoryBOX31 hr
Jan 20, 2:39 PM ESTCoastal Flood AdvisoryBOX21 hr
Jan 24, 2:49 PM ESTWind AdvisoryBOX40 hr
Jan 26, 7:01 AM ESTWind AdvisoryBOX12 hr
Feb 2, 3:38 AM ESTWind Chill WarningBOX57 hr
Feb 2, 3:38 AM ESTWind Chill AdvisoryBOX57 hr
Feb 21, 4:10 AM ESTCoastal Flood StatementBOX11 hr
Feb 26, 2:59 PM ESTWinter Weather AdvisoryBOX48 hr
Mar 3, 3:27 AM ESTWind AdvisoryBOX38 hr
Mar 3, 9:33 AM ESTCoastal Flood AdvisoryBOX26 hr
Mar 3, 12:09 PM ESTHigh Wind WarningBOX29 hr
Mar 13, 3:14 AM EDTHigh Wind WarningBOX43 hr
Mar 13, 3:43 PM EDTCoastal Flood AdvisoryBOX40 hr
Mar 14, 9:51 PM EDTWind AdvisoryBOX17 hr
Apr 1, 9:49 AM EDTDense Fog AdvisoryBOX119 min
Apr 6, 8:26 AM EDTDense Fog AdvisoryBOX4 hr
Apr 6, 3:48 PM EDTFire Weather WatchBOX11 hr
Apr 15, 9:43 PM EDTDense Fog AdvisoryBOX10 hr
May 27, 3:45 AM EDTBeach Hazards StatementBOX16 hr
Jun 2, 3:12 PM EDTHigh Surf AdvisoryBOX3 days
Jun 3, 4:23 AM EDTCoastal Flood StatementBOX22 hr
Jun 4, 3:00 AM EDTCoastal Flood AdvisoryBOX23 hr
Jun 5, 2:53 AM EDTCoastal Flood AdvisoryBOX25 hr
Jun 6, 7:39 PM EDTCoastal Flood StatementBOX8 hr
Jun 7, 4:42 PM EDTCoastal Flood AdvisoryBOX14 hr
Jun 23, 10:31 PM EDTDense Fog AdvisoryBOX8 hr
Jun 25, 9:31 PM EDTDense Fog AdvisoryBOX12 hr
Jun 27, 4:29 AM EDTSpecial Weather StatementBOX31 min
Jul 14, 8:11 AM EDTSpecial Weather StatementBOX49 min
Jul 16, 8:39 PM EDTSpecial Weather StatementBOX96 min
Jul 17, 8:08 PM EDTDense Fog AdvisoryBOX11 hr
Jul 26, 3:08 PM EDTHigh Surf AdvisoryBOX29 hr
Jul 27, 3:09 PM EDTRip Current StatementBOX26 hr
Jul 29, 11:33 AM EDTMesoscale DiscussionSPC117 min
Jul 29, 1:33 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 29, 10:09 PM EDTSpecial Weather StatementBOX66 min
Jul 30, 8:44 AM EDTRip Current StatementBOX11 hr
Aug 1, 2:56 AM EDTCoastal Flood StatementBOX23 hr
Aug 2, 3:14 AM EDTCoastal Flood StatementBOX23 hr
Aug 7, 1:42 PM EDTRip Current StatementBOX28 hr
Aug 9, 2:37 PM EDTFlood WatchBOX26 hr
Aug 13, 1:44 PM EDTSpecial Weather StatementBOX61 min
Aug 13, 2:20 PM EDTSevere Thunderstorm WarningBOX40 min
Aug 14, 2:22 PM EDTFlood WatchBOX19 hr
Aug 29, 2:29 AM EDTRip Current StatementBOX13 hr
Aug 29, 3:27 PM EDTHigh Surf AdvisoryBOX48 hr
Aug 30, 2:13 AM EDTDense Fog AdvisoryBOX7 hr
Aug 31, 3:36 PM EDTRip Current StatementBOX28 hr
Sep 11, 7:05 AM EDTDense Fog AdvisoryBOX3 hr
Sep 12, 4:22 AM EDTRip Current StatementBOX40 hr
Sep 13, 4:00 PM EDTMesoscale DiscussionSPC90 min
Sep 13, 5:00 PM EDTStorm Surge WatchBOX24 hr
Sep 13, 5:00 PM EDTTropical Storm WatchBOX24 hr
Sep 14, 10:58 AM EDTTropical Storm WarningBOX48 hr
Sep 14, 5:43 PM EDTCoastal Flood WarningBOX39 hr
Sep 14, 5:43 PM EDTHigh Surf AdvisoryBOX58 hr
Sep 16, 9:04 AM EDTCoastal Flood AdvisoryBOX6 hr
Sep 17, 3:54 AM EDTRip Current StatementBOX16 hr
Sep 19, 5:16 AM EDTRip Current StatementBOX14 hr
Sep 20, 3:44 PM EDTHigh Surf AdvisoryBOX27 hr
Sep 21, 3:34 PM EDTRip Current StatementBOX12 hr
Sep 23, 3:44 AM EDTRip Current StatementBOX16 hr
Sep 29, 2:12 PM EDTCoastal Flood StatementBOX13 hr
Oct 5, 3:27 AM EDTDense Fog AdvisoryBOX7 hr
Oct 5, 3:32 PM EDTDense Fog AdvisoryBOX19 hr
Oct 7, 2:01 AM EDTCoastal Flood AdvisoryBOX20 hr
Oct 14, 3:47 PM EDTCoastal Flood StatementBOX24 hr
Oct 20, 3:37 PM EDTWind AdvisoryBOX38 hr
Oct 31, 2:15 PM EDTCoastal Flood StatementBOX28 hr
Nov 21, 3:09 AM ESTWind AdvisoryBOX35 hr
Nov 26, 2:28 AM ESTWind AdvisoryBOX28 hr
Dec 8, 2:30 PM ESTHigh Wind WatchBOX38 hr
Dec 10, 4:08 AM ESTHigh Wind WarningBOX29 hr
Dec 16, 4:10 AM ESTHigh Wind WatchBOX23 hr
Dec 17, 2:59 AM ESTHigh Wind WarningBOX37 hr
Dec 18, 10:57 AM ESTMesoscale DiscussionSPC3 hr
Dec 18, 3:29 PM ESTWind AdvisoryBOX4 hr
Dec 25, 7:01 PM ESTDense Fog AdvisoryBOX18 hr
Dec 26, 7:22 PM ESTDense Fog AdvisoryBOX12 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 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.