Alert archive / Massachusetts / Norfolk County

Weather alerts in Norfolk County, Massachusetts, 2025

87 weather alerts in 2025, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Norfolk County and its neighbors

Each county as a circle sized by its count in 2025. Tap one for its archive.

Alerts
87
Warnings
22
Watches
13
Advisories
35
Busiest month
July22 alerts
Busiest day
September 6, 20255 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Norfolk County, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings13128%888%24 min
Flash flood warnings220%15100%92 min

Each office's whole area, 2025

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boston/Norton, MA: tornado warnings3167%580%12 min
NWS Boston/Norton, MA: severe thunderstorm warnings726115%27384%25 min
NWS Boston/Norton, MA: flash flood warnings191426%4587%70 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 7, 8:24 AM ESTWind AdvisoryBOX61 hr
Jan 17, 3:07 PM ESTWinter Storm WatchBOX35 hr
Jan 18, 2:33 PM ESTWinter Storm WarningBOX40 hr
Jan 19, 1:42 AM ESTWinter Weather AdvisoryBOX29 hr
Jan 29, 3:35 AM ESTWind AdvisoryBOX18 hr
Feb 4, 2:27 PM ESTWinter Weather AdvisoryBOX53 hr
Feb 6, 2:39 PM ESTWinter Storm WatchBOX36 hr
Feb 8, 2:55 AM ESTWinter Storm WarningBOX30 hr
Feb 8, 6:21 PM ESTMesoscale DiscussionSPC4 hr
Feb 8, 10:01 PM ESTMesoscale DiscussionSPC4 hr
Feb 13, 3:28 AM ESTWind AdvisoryBOX36 hr
Feb 14, 4:05 AM ESTWinter Weather AdvisoryBOX66 hr
Feb 15, 3:32 AM ESTHigh Wind WatchBOX24 hr
Feb 16, 3:16 AM ESTHigh Wind WarningBOX62 hr
Feb 16, 3:16 AM ESTWind AdvisoryBOX62 hr
Mar 6, 2:19 AM ESTWind AdvisoryBOX41 hr
Mar 8, 2:17 AM ESTWind AdvisoryBOX19 hr
Mar 17, 7:37 AM EDTSpecial Weather StatementBOX113 min
Mar 19, 7:05 PM EDTDense Fog AdvisoryBOX13 hr
Mar 31, 3:07 AM EDTDense Fog AdvisoryBOX7 hr
Apr 7, 1:31 PM EDTWind AdvisoryBOX30 hr
Apr 28, 10:36 PM EDTCoastal Flood StatementBOX5 hr
May 3, 3:32 PM EDTMesoscale DiscussionSPC88 min
May 3, 5:06 PM EDTSevere Thunderstorm WarningBOX39 min
May 3, 5:43 PM EDTSevere Thunderstorm WarningBOX47 min
May 21, 1:27 PM EDTWind AdvisoryBOX34 hr
May 21, 2:00 PM EDTCoastal Flood AdvisoryBOX33 hr
May 23, 6:22 AM EDTAreal Flood WarningBOX12 hr
Jun 18, 7:55 AM EDTHeat AdvisoryBOX36 hr
Jun 20, 12:03 AM EDTWind AdvisoryBOX18 hr
Jun 20, 1:19 PM EDTExtreme Heat WatchBOX13 hr
Jun 21, 2:04 AM EDTHeat AdvisoryBOX5 days
Jun 21, 2:04 AM EDTExtreme Heat WarningBOX4 days
Jul 1, 4:49 PM EDTMesoscale DiscussionSPC86 min
Jul 1, 7:15 PM EDTSevere Thunderstorm WarningBOX30 min
Jul 1, 7:32 PM EDTSevere Thunderstorm WarningBOX28 min
Jul 3, 1:30 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 4, 12:43 PM EDTHeat AdvisoryBOX4 days
Jul 8, 2:34 AM EDTFlood WatchBOX23 hr
Jul 8, 12:57 PM EDTMesoscale DiscussionSPC2 hr
Jul 8, 11:40 PM EDTSevere Thunderstorm WarningBOX49 min
Jul 10, 2:10 AM EDTFlood WatchBOX8 hr
Jul 10, 6:01 AM EDTFlash Flood WarningBOX3 hr
Jul 10, 8:15 AM EDTFlash Flood Warning Considerable damage threatBOX3 hr
Jul 14, 9:04 AM EDTHeat AdvisoryBOX3 days
Jul 20, 4:08 PM EDTSevere Thunderstorm WatchSPC5 hr
Jul 20, 7:07 PM EDTMesoscale DiscussionSPC83 min
Jul 20, 7:12 PM EDTSevere Thunderstorm WarningBOX48 min
Jul 20, 7:56 PM EDTSevere Thunderstorm WarningBOX49 min
Jul 22, 1:00 PM EDTHeat AdvisoryBOX3 days
Jul 25, 1:05 PM EDTMesoscale DiscussionSPC85 min
Jul 25, 1:41 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 25, 2:31 PM EDTSevere Thunderstorm WarningBOX38 min
Jul 25, 2:51 PM EDTSevere Thunderstorm WarningBOX54 min
Jul 26, 1:36 PM EDTHeat AdvisoryBOX4 days
Aug 14, 6:56 PM EDTSevere Thunderstorm WarningBOX64 min
Aug 18, 3:13 PM EDTHigh Surf AdvisoryBOX5 days
Aug 21, 1:03 PM EDTCoastal Flood StatementBOX37 hr
Aug 23, 8:04 PM EDTRip Current StatementBOX24 hr
Sep 6, 1:13 PM EDTSevere Thunderstorm WatchSPC7 hr
Sep 6, 3:49 PM EDTMesoscale DiscussionSPC86 min
Sep 6, 4:25 PM EDTSevere Thunderstorm WarningBOX65 min
Sep 6, 5:08 PM EDTSevere Thunderstorm WarningBOX52 min
Sep 6, 5:21 PM EDTSevere Thunderstorm WarningBOX54 min
Sep 25, 1:49 PM EDTSpecial Weather StatementBOX56 min
Oct 1, 1:54 AM EDTHigh Surf AdvisoryBOX18 hr
Oct 8, 3:06 AM EDTFreeze WatchBOX23 hr
Oct 9, 2:28 AM EDTFrost AdvisoryBOX31 hr
Oct 9, 2:28 AM EDTFreeze WarningBOX31 hr
Oct 9, 2:20 PM EDTCoastal Flood WatchBOX44 hr
Oct 11, 10:20 AM EDTCoastal Flood AdvisoryBOX32 hr
Oct 13, 4:10 AM EDTCoastal Flood AdvisoryBOX15 hr
Oct 30, 2:11 PM EDTWind AdvisoryBOX39 hr
Nov 3, 1:31 PM ESTWind AdvisoryBOX29 hr
Nov 4, 10:00 AM ESTHigh Wind WatchBOX26 hr
Nov 5, 11:52 AM ESTWind AdvisoryBOX17 hr
Nov 7, 12:33 AM ESTCoastal Flood StatementBOX13 hr
Dec 2, 12:47 PM ESTCoastal Flood StatementBOX22 hr
Dec 2, 1:34 PM ESTMesoscale DiscussionSPC4 hr
Dec 6, 2:33 AM ESTCoastal Flood StatementBOX11 hr
Dec 10, 1:05 PM ESTWind AdvisoryBOX38 hr
Dec 13, 12:54 AM ESTWinter Weather AdvisoryBOX42 hr
Dec 17, 1:45 PM ESTWind AdvisoryBOX64 hr
Dec 18, 12:22 AM ESTHigh Wind WarningBOX39 hr
Dec 25, 12:58 PM ESTWinter Weather AdvisoryBOX43 hr
Dec 27, 12:40 PM ESTWinter Weather AdvisoryBOX41 hr
Dec 29, 12:39 PM ESTWind AdvisoryBOX31 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 archive20242026

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.