Alert archive / Massachusetts / Bristol County
Weather alerts in Bristol County, Massachusetts, 2023
165 weather alerts in 2023, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Bristol County and its neighbors
Each county as a circle sized by its count in 2023. Tap one for its archive.
- Alerts
- 165
- Warnings
- 58
- Watches
- 24
- Advisories
- 37
- Busiest month
- July36 alerts
- Busiest day
- August 18, 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 7 tornado warnings covering Bristol County in 2023 had a tornado report inside them; 2 of 2 tornado reports fell inside a warning, on average 36 minutes after it went out.
Bristol County, 2023
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 7 | 3 | 57% | 2 | 100% | 36 min |
| Severe thunderstorm warnings | 18 | 14 | 22% | 22 | 82% | 32 min |
| Flash flood warnings | 15 | 3 | 80% | 1 | 100% | 153 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 12, 3:21 PM EST | Wind Advisory | BOX | 19 hr |
| Jan 24, 2:28 PM EST | Flood Watch | BOX | 41 hr |
| Jan 24, 2:49 PM EST | Wind Advisory | BOX | 40 hr |
| Jan 24, 8:34 PM EST | Coastal Flood Advisory | BOX | 30 hr |
| Jan 26, 5:00 AM EST | River Flood Warning | BOX | 21 days |
| Jan 28, 10:24 PM EST | River Flood Warning | BOX | 9 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 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 13, 3:36 PM EDT | Winter Weather Advisory | BOX | 34 hr |
| Mar 14, 12:32 PM EDT | River Flood Warning | BOX | 3 days |
| 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 |
| Apr 15, 9:43 PM EDT | Dense Fog Advisory | BOX | 10 hr |
| Apr 22, 11:21 PM EDT | Special Weather Statement | BOX | 39 min |
| 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 27, 3:45 AM EDT | Beach Hazards Statement | BOX | 16 hr |
| Jun 6, 4:20 PM EDT | Severe Thunderstorm Warning | BOX | 55 min |
| Jun 13, 6:55 PM EDT | Dense Fog Advisory | BOX | 14 hr |
| Jun 14, 6:50 PM EDT | Special Weather Statement | BOX | 40 min |
| Jun 14, 7:04 PM EDT | Severe Thunderstorm Warning | BOX | 41 min |
| Jun 17, 10:42 AM EDT | Special Weather Statement | BOX | 63 min |
| Jun 17, 3:43 PM EDT | Special Weather Statement | BOX | 62 min |
| Jun 23, 10:31 PM EDT | Dense Fog Advisory | BOX | 8 hr |
| Jun 25, 9:31 PM EDT | Dense Fog Advisory | BOX | 12 hr |
| Jun 27, 4:33 AM EDT | Special Weather Statement | BOX | 42 min |
| Jun 27, 4:44 AM EDT | Flash Flood Warning | BOX | 56 min |
| Jun 28, 5:38 AM EDT | Special Weather Statement | BOX | 52 min |
| Jun 28, 6:41 AM EDT | Special Weather Statement | BOX | 49 min |
| Jul 3, 2:47 AM EDT | Special Weather Statement | BOX | 58 min |
| Jul 3, 10:13 AM EDT | Flood Watch | BOX | 34 hr |
| Jul 4, 3:03 PM EDT | Special Weather Statement | BOX | 57 min |
| Jul 4, 3:10 PM EDT | Flash Flood Warning | BOX | 2 hr |
| Jul 4, 4:03 PM EDT | Flash Flood Warning | BOX | 89 min |
| Jul 10, 7:14 AM EDT | Special Weather Statement | BOX | 91 min |
| Jul 10, 8:50 AM EDT | Special Weather Statement | BOX | 85 min |
| 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, 12:45 PM EDT | Flash Flood Warning | BOX | 2 hr |
| Jul 10, 12:51 PM EDT | Special Weather Statement | BOX | 84 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, 1:36 PM EDT | Flash Flood Warning | BOX | 6 hr |
| Jul 16, 2:19 PM EDT | Flash Flood Warning | BOX | 5 hr |
| Jul 16, 5:29 PM EDT | Flash Flood Warning | BOX | 4 hr |
| Jul 25, 3:27 PM EDT | Heat Advisory | BOX | 4 days |
| Jul 26, 12:37 PM EDT | Flood Watch | BOX | 31 hr |
| Jul 26, 3:08 PM EDT | High Surf Advisory | BOX | 29 hr |
| Jul 27, 12:48 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 27, 3:09 PM EDT | Rip Current Statement | BOX | 26 hr |
| Jul 27, 4:20 PM EDT | Mesoscale Discussion | SPC | 85 min |
| Jul 27, 5:50 PM EDT | Severe Thunderstorm Warning | BOX | 55 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, 5:14 AM EDT | Special Weather Statement | BOX | 61 min |
| 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, 7:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 29, 8:03 PM EDT | Severe Thunderstorm Warning | BOX | 42 min |
| Jul 29, 8:21 PM EDT | Severe Thunderstorm Warning | BOX | 39 min |
| Jul 29, 8:32 PM EDT | Tornado Warning | BOX | 28 min |
| Jul 29, 8:39 PM EDT | Severe Thunderstorm Warning | BOX | 66 min |
| Jul 30, 8:44 AM EDT | Rip Current Statement | BOX | 11 hr |
| Aug 7, 1:42 PM EDT | Rip Current Statement | BOX | 28 hr |
| Aug 8, 3:10 AM EDT | Flood Watch | BOX | 15 hr |
| Aug 8, 9:17 AM EDT | Severe Thunderstorm Warning | BOX | 58 min |
| Aug 8, 10:07 AM EDT | Severe Thunderstorm Warning | BOX | 53 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 8, 10:48 AM EDT | Severe Thunderstorm Warning | BOX | 57 min |
| Aug 8, 11:18 AM EDT | Tornado Warning | BOX | 27 min |
| Aug 9, 2:37 PM EDT | Flood Watch | BOX | 26 hr |
| Aug 13, 5:46 AM EDT | Special Weather Statement | BOX | 59 min |
| Aug 13, 6:22 AM EDT | Special Weather Statement | BOX | 53 min |
| Aug 13, 9:09 AM EDT | Special Weather Statement | BOX | 36 min |
| Aug 13, 3:59 PM EDT | Severe Thunderstorm Warning | BOX | 46 min |
| Aug 13, 4:35 PM EDT | Severe Thunderstorm Warning | BOX | 40 min |
| Aug 13, 6:10 PM EDT | Special Weather Statement | BOX | 65 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, 8:26 AM EDT | Flash Flood Warning | BOX | 2 hr |
| Aug 18, 8:35 AM EDT | Tornado Warning | BOX | 40 min |
| Aug 18, 8:50 AM EDT | Severe Thunderstorm Warning | BOX | 55 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, 9:23 AM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 18, 9:36 AM EDT | Flash Flood Warning | BOX | 2 hr |
| Aug 29, 2:29 AM EDT | Rip Current Statement | BOX | 13 hr |
| Aug 29, 3:27 PM EDT | High Surf Advisory | BOX | 48 hr |
| Aug 30, 2:13 AM EDT | Dense Fog Advisory | BOX | 7 hr |
| Aug 31, 3:36 PM EDT | Rip Current Statement | BOX | 28 hr |
| Sep 4, 2:49 PM EDT | Heat Advisory | BOX | 4 days |
| Sep 9, 3:26 PM EDT | Severe Thunderstorm Warning | BOX | 49 min |
| Sep 9, 4:13 PM EDT | Severe Thunderstorm Warning | BOX | 47 min |
| 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, 3:54 PM EDT | Special Weather Statement | BOX | 66 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, 9:44 PM EDT | Special Weather Statement | BOX | 91 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 11, 11:06 PM EDT | Special Weather Statement | BOX | 84 min |
| Sep 12, 4:22 AM EDT | Rip Current Statement | BOX | 40 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, 4:41 PM EDT | Tornado Warning | BOX | 34 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 18, 2:47 AM EDT | Flood Watch | BOX | 22 hr |
| Sep 18, 5:22 PM EDT | Special Weather Statement | BOX | 53 min |
| Sep 19, 5:16 AM EDT | Rip Current Statement | BOX | 14 hr |
| Sep 20, 3:44 PM EDT | High Surf Advisory | BOX | 27 hr |
| Sep 23, 3:44 AM EDT | Rip Current Statement | BOX | 16 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 |
| Oct 23, 1:56 PM EDT | Frost Advisory | BOX | 19 hr |
| Nov 17, 5:05 AM EST | Dense Fog Advisory | BOX | 4 hr |
| Nov 21, 3:09 AM EST | Wind Advisory | BOX | 35 hr |
| Nov 26, 2:42 AM EST | Coastal Flood Statement | BOX | 30 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 10, 4:13 AM EST | Coastal Flood Advisory | BOX | 24 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 17, 1:45 PM EST | Coastal Flood Advisory | BOX | 27 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, 3:34 PM EST | Coastal Flood Advisory | BOX | 86 min |
| 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.