Alert archive / Massachusetts / Norfolk County
Weather alerts in Norfolk County, Massachusetts, 2023
179 weather alerts in 2023, 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 2023. Tap one for its archive.
- Alerts
- 179
- Warnings
- 61
- Watches
- 26
- Advisories
- 40
- Busiest month
- July43 alerts
- Busiest day
- July 27, 20239 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 5 tornado warnings covering Norfolk County in 2023 had a tornado report inside them; 3 of 4 tornado reports fell inside a warning, on average 9 minutes after it went out.
Norfolk County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 3 | 40% | 4 | 75% | 9 min |
| Severe thunderstorm warnings | 18 | 16 | 11% | 8 | 88% | 19 min |
| Flash flood warnings | 15 | 3 | 80% | 1 | 100% | 60 min |
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 5, 2:40 PM EST | Winter Weather Advisory | BOX | 28 hr |
| Jan 12, 3:21 PM EST | Wind Advisory | BOX | 19 hr |
| Jan 14, 3:34 AM EST | Wind Advisory | BOX | 39 hr |
| Jan 15, 3:57 AM EST | Winter Weather Advisory | BOX | 36 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 21, 2:58 PM EST | Winter Weather Advisory | BOX | 54 hr |
| Jan 22, 3:14 AM EST | Coastal Flood Advisory | BOX | 35 hr |
| Jan 23, 1:47 PM EST | Mesoscale Discussion | SPC | 3 hr |
| Jan 24, 2:28 PM EST | Flood Watch | BOX | 41 hr |
| Jan 24, 2:49 PM EST | Wind Advisory | BOX | 40 hr |
| Feb 1, 3:11 AM EST | Wind Chill Watch | BOX | 24 hr |
| Feb 2, 3:38 AM EST | Wind Chill Warning | BOX | 57 hr |
| Feb 7, 3:02 AM EST | Winter Weather Advisory | BOX | 23 hr |
| Feb 21, 4:10 AM EST | Coastal Flood Statement | BOX | 11 hr |
| Feb 22, 3:14 PM EST | Winter Weather Advisory | BOX | 36 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, 3:28 AM EST | Winter Weather Advisory | BOX | 35 hr |
| Mar 11, 3:09 PM EST | Winter Storm Watch | BOX | 47 hr |
| Mar 12, 4:00 AM EDT | High Wind Watch | BOX | 23 hr |
| Mar 12, 3:35 PM EDT | Winter Storm Warning | BOX | 58 hr |
| Mar 13, 3:14 AM EDT | High Wind Warning | BOX | 43 hr |
| Mar 13, 3:25 AM EDT | Coastal Flood Watch | BOX | 12 hr |
| Mar 13, 3:36 PM EDT | Winter Weather Advisory | BOX | 34 hr |
| Mar 13, 3:43 PM EDT | Coastal Flood Advisory | BOX | 40 hr |
| Mar 14, 1:37 PM EDT | Wind Advisory | BOX | 8 hr |
| Apr 1, 4:07 AM EDT | Dense Fog Advisory | BOX | 6 hr |
| Apr 1, 6:18 PM EDT | Mesoscale Discussion | SPC | 57 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 7, 3:12 AM EDT | Red Flag Warning | BOX | 17 hr |
| Apr 10, 2:09 PM EDT | Fire Weather Watch | BOX | 12 hr |
| Apr 11, 1:48 AM EDT | Red Flag Warning | BOX | 17 hr |
| Apr 11, 7:09 PM EDT | Red Flag Warning | BOX | 24 hr |
| May 9, 2:23 PM EDT | Frost Advisory | BOX | 17 hr |
| May 15, 3:58 AM EDT | Fire Weather Watch | BOX | 40 hr |
| May 16, 2:29 AM EDT | Red Flag Warning | BOX | 17 hr |
| May 16, 3:26 PM EDT | Freeze Watch | BOX | 25 hr |
| May 16, 7:45 PM EDT | Red Flag Warning | BOX | 24 hr |
| May 17, 4:23 PM EDT | Freeze Warning | BOX | 14 hr |
| May 20, 11:33 PM EDT | Special Weather Statement | BOX | 87 min |
| 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 2, 4:57 PM EDT | Special Weather Statement | BOX | 33 min |
| Jun 2, 5:02 PM EDT | Severe Thunderstorm Warning | BOX | 24 min |
| 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 Statement | BOX | 24 hr |
| Jun 6, 3:31 PM EDT | Special Weather Statement | BOX | 59 min |
| Jun 6, 7:39 PM EDT | Coastal Flood Statement | BOX | 8 hr |
| Jun 7, 4:42 PM EDT | Coastal Flood Statement | BOX | 14 hr |
| Jun 9, 2:52 PM EDT | Special Weather Statement | BOX | 38 min |
| Jun 13, 6:55 PM EDT | Dense Fog Advisory | BOX | 14 hr |
| Jun 14, 7:27 PM EDT | Severe Thunderstorm Warning | BOX | 48 min |
| Jun 17, 4:57 PM EDT | Special Weather Statement | BOX | 63 min |
| Jun 17, 5:55 PM EDT | Special Weather Statement | BOX | 65 min |
| Jun 23, 10:31 PM EDT | Dense Fog Advisory | BOX | 8 hr |
| Jul 3, 1:24 AM EDT | Special Weather Statement | BOX | 81 min |
| Jul 3, 10:13 AM EDT | Flood Watch | BOX | 34 hr |
| Jul 3, 8:44 PM EDT | Coastal Flood Statement | BOX | 5 hr |
| Jul 4, 3:07 PM EDT | Coastal Flood Statement | BOX | 11 hr |
| Jul 10, 11:38 AM EDT | Special Weather Statement | BOX | 82 min |
| Jul 10, 11:49 AM EDT | Areal Flood Warning | BOX | 3 hr |
| Jul 10, 12:51 PM EDT | Special Weather Statement | BOX | 84 min |
| Jul 10, 3:24 PM EDT | Special Weather Statement | BOX | 81 min |
| Jul 13, 12:12 PM EDT | Flood Watch | BOX | 36 hr |
| Jul 14, 9:52 AM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 15, 3:09 AM EDT | Flood Watch | BOX | 44 hr |
| Jul 16, 10:40 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jul 16, 12:24 PM EDT | Areal Flood Warning | BOX | 3 hr |
| Jul 16, 1:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 16, 2:19 PM EDT | Flash Flood Warning | BOX | 5 hr |
| Jul 21, 8:46 PM EDT | Special Weather Statement | BOX | 59 min |
| Jul 21, 9:02 PM EDT | Flash Flood Warning | BOX | 3 hr |
| Jul 21, 9:43 PM EDT | Flash Flood Warning | BOX | 3 hr |
| Jul 21, 9:48 PM EDT | Special Weather Statement | BOX | 57 min |
| Jul 25, 3:27 PM EDT | Heat Advisory | BOX | 4 days |
| Jul 25, 3:48 PM EDT | Severe Thunderstorm Warning | BOX | 27 min |
| Jul 25, 3:59 PM EDT | Flash Flood Warning | BOX | 100 min |
| Jul 25, 4:00 PM EDT | Severe Thunderstorm Warning | BOX | 60 min |
| Jul 25, 4:54 PM EDT | Flash Flood Warning | BOX | 44 min |
| Jul 26, 12:37 PM EDT | Flood Watch | BOX | 31 hr |
| Jul 27, 11:05 AM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 27, 12:48 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 27, 4:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 27, 5:01 PM EDT | Special Weather Statement | BOX | 44 min |
| Jul 27, 5:24 PM EDT | Special Weather Statement | BOX | 66 min |
| Jul 27, 5:27 PM EDT | Severe Thunderstorm Warning | BOX | 48 min |
| Jul 27, 6:01 PM EDT | Severe Thunderstorm Warning | BOX | 59 min |
| Jul 27, 6:07 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Jul 27, 6:37 PM EDT | Severe Thunderstorm Warning | BOX | 53 min |
| Jul 29, 3:08 AM EDT | Flood Watch | BOX | 19 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, 1:39 PM EDT | Flash Flood Warning | BOX | 73 min |
| Jul 29, 4:45 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 29, 4:50 PM EDT | Flash Flood Warning | BOX | 4 hr |
| Jul 29, 7:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 29, 7:41 PM EDT | Severe Thunderstorm Warning | BOX | 34 min |
| Jul 29, 8:03 PM EDT | Severe Thunderstorm Warning | BOX | 42 min |
| 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 3, 3:19 PM EDT | Coastal Flood Statement | BOX | 12 hr |
| Aug 8, 3:10 AM EDT | Flood Watch | BOX | 15 hr |
| Aug 8, 9:16 AM EDT | Areal Flood Warning | BOX | 4 hr |
| Aug 8, 10:01 AM EDT | Special Weather Statement | BOX | 44 min |
| Aug 8, 10:21 AM EDT | Severe Thunderstorm Warning | BOX | 54 min |
| Aug 8, 10:47 AM EDT | Flash Flood Warning | BOX | 3 hr |
| Aug 9, 2:37 PM EDT | Flood Watch | BOX | 26 hr |
| Aug 13, 3:59 PM EDT | Severe Thunderstorm Warning | BOX | 46 min |
| Aug 14, 2:22 PM EDT | Flood Watch | BOX | 19 hr |
| Aug 18, 8:05 AM EDT | Severe Thunderstorm Warning | BOX | 55 min |
| Aug 18, 8:35 AM EDT | Tornado Warning | BOX | 40 min |
| Aug 18, 8:56 AM EDT | Severe Thunderstorm Warning | BOX | 34 min |
| Aug 18, 9:12 AM EDT | Severe Thunderstorm Warning | BOX | 63 min |
| Aug 18, 9:18 AM EDT | Flash Flood Warning | BOX | 79 min |
| Aug 18, 9:22 AM EDT | Tornado Warning | BOX | 23 min |
| Aug 18, 9:36 AM EDT | Flash Flood Warning | BOX | 2 hr |
| Aug 18, 9:45 AM EDT | Tornado Warning | BOX | 21 min |
| Aug 18, 3:33 PM EDT | Special Weather Statement | BOX | 57 min |
| Aug 21, 8:22 PM EDT | Special Weather Statement | BOX | 53 min |
| Aug 30, 2:13 AM EDT | Dense Fog Advisory | BOX | 7 hr |
| Sep 4, 2:49 PM EDT | Heat Advisory | BOX | 4 days |
| Sep 8, 2:15 PM EDT | Severe Thunderstorm Warning | BOX | 60 min |
| Sep 8, 2:52 PM EDT | Severe Thunderstorm Warning | BOX | 53 min |
| Sep 9, 3:11 PM EDT | Special Weather Statement | BOX | 49 min |
| Sep 9, 3:26 PM EDT | Severe Thunderstorm Warning | BOX | 49 min |
| Sep 9, 4:10 PM EDT | Special Weather Statement | BOX | 65 min |
| Sep 9, 4:13 PM EDT | Severe Thunderstorm Warning | BOX | 47 min |
| Sep 10, 1:20 PM EDT | Special Weather Statement | BOX | 40 min |
| Sep 10, 2:39 PM EDT | Flash Flood Warning | BOX | 3 hr |
| Sep 11, 3:00 AM EDT | Flood Watch | BOX | 23 hr |
| Sep 11, 7:05 AM EDT | Dense Fog Advisory | BOX | 3 hr |
| Sep 11, 1:51 PM EDT | Special Weather Statement | BOX | 54 min |
| Sep 11, 2:52 PM EDT | Special Weather Statement | BOX | 53 min |
| Sep 11, 4:10 PM EDT | Flash Flood Warning | BOX | 3 hr |
| Sep 11, 5:11 PM EDT | Flash Flood Warning | BOX | 3 hr |
| Sep 11, 8:14 PM EDT | Flash Flood Warning | BOX | 3 hr |
| Sep 11, 8:26 PM EDT | Special Weather Statement | BOX | 94 min |
| Sep 11, 9:50 PM EDT | Areal Flood Warning | BOX | 3 hr |
| Sep 11, 10:57 PM EDT | Areal Flood Warning | BOX | 12 hr |
| Sep 12, 12:58 PM EDT | Flood Watch | BOX | 34 hr |
| Sep 13, 11:14 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 13, 12:14 PM EDT | Flash Flood Warning | BOX | 105 min |
| Sep 13, 4:00 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Sep 13, 5:00 PM EDT | Tropical Storm Watch | BOX | 24 hr |
| Sep 13, 5:12 PM EDT | Tornado Warning | BOX | 33 min |
| Sep 13, 5:55 PM EDT | Tornado Warning | BOX | 35 min |
| Sep 14, 10:58 AM EDT | Tropical Storm Warning | BOX | 48 hr |
| Sep 14, 5:43 PM EDT | High Surf Advisory | BOX | 58 hr |
| Sep 15, 5:07 AM EDT | Coastal Flood Advisory | BOX | 28 hr |
| Sep 17, 3:54 AM EDT | Rip Current Statement | BOX | 16 hr |
| Sep 18, 2:47 AM EDT | Flood Watch | BOX | 22 hr |
| Sep 21, 7:03 AM EDT | Rip Current Statement | BOX | 20 hr |
| Sep 28, 5:45 AM EDT | Dense Fog Advisory | BOX | 4 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 |
| Nov 21, 3:09 AM EST | Wind Advisory | BOX | 35 hr |
| Dec 8, 2:23 PM EST | Flood Watch | BOX | 67 hr |
| Dec 9, 2:31 PM EST | Wind Advisory | BOX | 14 hr |
| Dec 10, 4:08 AM EST | High Wind Warning | BOX | 29 hr |
| Dec 10, 4:08 AM EST | Wind Advisory | BOX | 25 hr |
| Dec 11, 12:32 AM EST | Areal Flood Warning | BOX | 9 hr |
| Dec 11, 2:10 AM EST | Areal Flood Warning | BOX | 8 hr |
| Dec 11, 2:41 AM EST | Areal Flood Warning | BOX | 7 hr |
| Dec 16, 4:10 AM EST | High Wind Watch | BOX | 23 hr |
| Dec 16, 2:11 PM EST | Flood Watch | BOX | 52 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, 11:27 AM EST | Special Weather Statement | BOX | 63 min |
| Dec 18, 12:48 PM EST | River Flood Warning | BOX | 10 days |
| Dec 18, 3:29 PM EST | Wind Advisory | BOX | 4 hr |
| Dec 18, 3:33 PM EST | River Flood Warning | BOX | 22 hr |
| Dec 19, 9:54 AM EST | Areal Flood Warning | BOX | 24 hr |
| Dec 24, 8:56 PM EST | Dense Fog Advisory | BOX | 12 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.
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.