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
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 13 | 12 | 8% | 8 | 88% | 24 min |
| Flash flood warnings | 2 | 2 | 0% | 15 | 100% | 92 min |
Each office's whole area, 2025
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Boston/Norton, MA: tornado warnings | 3 | 1 | 67% | 5 | 80% | 12 min |
| NWS Boston/Norton, MA: severe thunderstorm warnings | 72 | 61 | 15% | 273 | 84% | 25 min |
| NWS Boston/Norton, MA: flash flood warnings | 19 | 14 | 26% | 45 | 87% | 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.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jan 7, 8:24 AM EST | Wind Advisory | BOX | 61 hr |
| Jan 17, 3:07 PM EST | Winter Storm Watch | BOX | 35 hr |
| Jan 18, 2:33 PM EST | Winter Storm Warning | BOX | 40 hr |
| Jan 19, 1:42 AM EST | Winter Weather Advisory | BOX | 29 hr |
| Jan 29, 3:35 AM EST | Wind Advisory | BOX | 18 hr |
| Feb 4, 2:27 PM EST | Winter Weather Advisory | BOX | 53 hr |
| Feb 6, 2:39 PM EST | Winter Storm Watch | BOX | 36 hr |
| Feb 8, 2:55 AM EST | Winter Storm Warning | BOX | 30 hr |
| Feb 8, 6:21 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 8, 10:01 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 13, 3:28 AM EST | Wind Advisory | BOX | 36 hr |
| Feb 14, 4:05 AM EST | Winter Weather Advisory | BOX | 66 hr |
| Feb 15, 3:32 AM EST | High Wind Watch | BOX | 24 hr |
| Feb 16, 3:16 AM EST | High Wind Warning | BOX | 62 hr |
| Feb 16, 3:16 AM EST | Wind Advisory | BOX | 62 hr |
| Mar 6, 2:19 AM EST | Wind Advisory | BOX | 41 hr |
| Mar 8, 2:17 AM EST | Wind Advisory | BOX | 19 hr |
| Mar 17, 7:37 AM EDT | Special Weather Statement | BOX | 113 min |
| Mar 19, 7:05 PM EDT | Dense Fog Advisory | BOX | 13 hr |
| Mar 31, 3:07 AM EDT | Dense Fog Advisory | BOX | 7 hr |
| Apr 7, 1:31 PM EDT | Wind Advisory | BOX | 30 hr |
| Apr 28, 10:36 PM EDT | Coastal Flood Statement | BOX | 5 hr |
| May 3, 3:32 PM EDT | Mesoscale Discussion | SPC | 88 min |
| May 3, 5:06 PM EDT | Severe Thunderstorm Warning | BOX | 39 min |
| May 3, 5:43 PM EDT | Severe Thunderstorm Warning | BOX | 47 min |
| May 21, 1:27 PM EDT | Wind Advisory | BOX | 34 hr |
| May 21, 2:00 PM EDT | Coastal Flood Advisory | BOX | 33 hr |
| May 23, 6:22 AM EDT | Areal Flood Warning | BOX | 12 hr |
| Jun 18, 7:55 AM EDT | Heat Advisory | BOX | 36 hr |
| Jun 20, 12:03 AM EDT | Wind Advisory | BOX | 18 hr |
| Jun 20, 1:19 PM EDT | Extreme Heat Watch | BOX | 13 hr |
| Jun 21, 2:04 AM EDT | Heat Advisory | BOX | 5 days |
| Jun 21, 2:04 AM EDT | Extreme Heat Warning | BOX | 4 days |
| Jul 1, 4:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jul 1, 7:15 PM EDT | Severe Thunderstorm Warning | BOX | 30 min |
| Jul 1, 7:32 PM EDT | Severe Thunderstorm Warning | BOX | 28 min |
| Jul 3, 1:30 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 4, 12:43 PM EDT | Heat Advisory | BOX | 4 days |
| Jul 8, 2:34 AM EDT | Flood Watch | BOX | 23 hr |
| Jul 8, 12:57 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 8, 11:40 PM EDT | Severe Thunderstorm Warning | BOX | 49 min |
| Jul 10, 2:10 AM EDT | Flood Watch | BOX | 8 hr |
| Jul 10, 6:01 AM EDT | Flash Flood Warning | BOX | 3 hr |
| Jul 10, 8:15 AM EDT | Flash Flood Warning | BOX | 3 hr |
| Jul 14, 9:04 AM EDT | Heat Advisory | BOX | 3 days |
| Jul 20, 4:08 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 20, 7:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 20, 7:12 PM EDT | Severe Thunderstorm Warning | BOX | 48 min |
| Jul 20, 7:56 PM EDT | Severe Thunderstorm Warning | BOX | 49 min |
| Jul 22, 1:00 PM EDT | Heat Advisory | BOX | 3 days |
| Jul 25, 1:05 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 25, 1:41 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 25, 2:31 PM EDT | Severe Thunderstorm Warning | BOX | 38 min |
| Jul 25, 2:51 PM EDT | Severe Thunderstorm Warning | BOX | 54 min |
| Jul 26, 1:36 PM EDT | Heat Advisory | BOX | 4 days |
| Aug 14, 6:56 PM EDT | Severe Thunderstorm Warning | BOX | 64 min |
| Aug 18, 3:13 PM EDT | High Surf Advisory | BOX | 5 days |
| Aug 21, 1:03 PM EDT | Coastal Flood Statement | BOX | 37 hr |
| Aug 23, 8:04 PM EDT | Rip Current Statement | BOX | 24 hr |
| Sep 6, 1:13 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 6, 3:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Sep 6, 4:25 PM EDT | Severe Thunderstorm Warning | BOX | 65 min |
| Sep 6, 5:08 PM EDT | Severe Thunderstorm Warning | BOX | 52 min |
| Sep 6, 5:21 PM EDT | Severe Thunderstorm Warning | BOX | 54 min |
| Sep 25, 1:49 PM EDT | Special Weather Statement | BOX | 56 min |
| Oct 1, 1:54 AM EDT | High Surf Advisory | BOX | 18 hr |
| Oct 8, 3:06 AM EDT | Freeze Watch | BOX | 23 hr |
| Oct 9, 2:28 AM EDT | Frost Advisory | BOX | 31 hr |
| Oct 9, 2:28 AM EDT | Freeze Warning | BOX | 31 hr |
| Oct 9, 2:20 PM EDT | Coastal Flood Watch | BOX | 44 hr |
| Oct 11, 10:20 AM EDT | Coastal Flood Advisory | BOX | 32 hr |
| Oct 13, 4:10 AM EDT | Coastal Flood Advisory | BOX | 15 hr |
| Oct 30, 2:11 PM EDT | Wind Advisory | BOX | 39 hr |
| Nov 3, 1:31 PM EST | Wind Advisory | BOX | 29 hr |
| Nov 4, 10:00 AM EST | High Wind Watch | BOX | 26 hr |
| Nov 5, 11:52 AM EST | Wind Advisory | BOX | 17 hr |
| Nov 7, 12:33 AM EST | Coastal Flood Statement | BOX | 13 hr |
| Dec 2, 12:47 PM EST | Coastal Flood Statement | BOX | 22 hr |
| Dec 2, 1:34 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Dec 6, 2:33 AM EST | Coastal Flood Statement | BOX | 11 hr |
| Dec 10, 1:05 PM EST | Wind Advisory | BOX | 38 hr |
| Dec 13, 12:54 AM EST | Winter Weather Advisory | BOX | 42 hr |
| Dec 17, 1:45 PM EST | Wind Advisory | BOX | 64 hr |
| Dec 18, 12:22 AM EST | High Wind Warning | BOX | 39 hr |
| Dec 25, 12:58 PM EST | Winter Weather Advisory | BOX | 43 hr |
| Dec 27, 12:40 PM EST | Winter Weather Advisory | BOX | 41 hr |
| Dec 29, 12:39 PM EST | Wind Advisory | BOX | 31 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 | 13 |
| Severe Thunderstorm Watch | 4 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 2 |
| Flooding | |
| Areal Flood Warning | 1 |
| Flash Flood Warning | 2 |
| Flood Watch | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 6 |
| Heat | |
| Extreme Heat Warning | 1 |
| Extreme Heat Watch | 1 |
| Heat Advisory | 6 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 2 |
| High Wind Watch | 2 |
| Wind Advisory | 15 |
| Fog and smoke | |
| Dense Fog Advisory | 2 |
| Coast and beach | |
| Coastal Flood Watch | 1 |
| Coastal Flood Advisory | 3 |
| High Surf Advisory | 2 |
| Coastal Flood Statement | 5 |
| Rip Current Statement | 1 |
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.