Alert archive / Massachusetts / Bristol County

Weather alerts in Bristol County, Massachusetts, 2018

200 weather alerts in 2018, 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 2018. Tap one for its archive.

Alerts: 200
Warnings: 44
Watches: 32
Advisories: 93
Busiest month: March29 alerts
Busiest day: October 23, 20188 alerts

Over time

By month

Warning verification

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

1 of 2 tornado warnings covering Bristol County in 2018 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 14 minutes after it went out.

Bristol County, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	1	100%	14 min
Severe thunderstorm warnings	10	4	60%	4	25%	27 min
Flash flood warnings	7	2	71%	2	100%	75 min

Each office's whole area, 2018

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Boston/Norton, MA: tornado warnings	16	4	75%	12	42%	11 min
NWS Boston/Norton, MA: severe thunderstorm warnings	91	44	52%	233	59%	24 min
NWS Boston/Norton, MA: flash flood warnings	36	10	72%	114	94%	68 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 2, 3:09 AM EST	Winter Storm Watch	BOX	25 hr
Jan 2, 3:50 PM EST	High Wind Watch	BOX	12 hr
Jan 3, 3:50 AM EST	Blizzard Warning	BOX	39 hr
Jan 3, 3:50 AM EST	Winter Storm Warning	BOX	39 hr
Jan 4, 3:46 AM EST	Wind Chill Watch	BOX	24 hr
Jan 4, 6:06 AM EST	Mesoscale Discussion	SPC	6 hr
Jan 4, 7:14 PM EST	Wind Advisory	BOX	5 hr
Jan 5, 4:02 AM EST	Wind Chill Advisory	BOX	54 hr
Jan 5, 8:22 AM EST	Wind Advisory	BOX	14 hr
Jan 10, 3:17 PM EST	Flood Watch	BOX	70 hr
Jan 12, 2:58 AM EST	Wind Advisory	BOX	30 hr
Jan 12, 3:35 AM EST	Winter Weather Advisory	BOX	33 hr
Jan 12, 4:22 PM EST	Dense Fog Advisory	BOX	13 hr
Jan 12, 7:30 PM EST	Areal Flood Warning	BOX	6 hr
Jan 13, 1:06 AM EST	Areal Flood Warning	BOX	6 hr
Jan 13, 5:24 AM EST	River Flood Warning	BOX	4 days
Jan 13, 7:02 AM EST	Areal Flood Warning	BOX	4 hr
Jan 16, 3:56 AM EST	Winter Weather Advisory	BOX	35 hr
Jan 17, 4:47 PM EST	Special Weather Statement	BOX	88 min
Jan 22, 1:11 PM EST	Dense Fog Advisory	BOX	22 hr
Jan 22, 2:08 PM EST	Wind Advisory	BOX	28 hr
Jan 23, 2:37 PM EST	Areal Flood Advisory	BOX	53 min
Jan 28, 4:02 PM EST	Winter Weather Advisory	BOX	45 hr
Feb 10, 2:15 PM EST	Flood Watch	BOX	32 hr
Feb 14, 5:46 AM EST	Winter Weather Advisory	BOX	3 hr
Feb 16, 3:30 AM EST	Winter Storm Watch	BOX	34 hr
Feb 17, 3:30 AM EST	Winter Storm Warning	BOX	27 hr
Feb 20, 2:15 AM EST	Dense Fog Advisory	BOX	7 hr
Feb 20, 3:53 PM EST	Dense Fog Advisory	BOX	27 hr
Feb 28, 3:27 PM EST	Flood Watch	BOX	57 hr
Feb 28, 3:28 PM EST	High Wind Watch	BOX	24 hr
Mar 1, 3:27 AM EST	High Wind Warning	BOX	52 hr
Mar 1, 11:37 AM EST	Coastal Flood Advisory	BOX	41 hr
Mar 1, 3:38 PM EST	Wind Advisory	BOX	60 hr
Mar 2, 4:06 AM EST	Winter Weather Advisory	BOX	18 hr
Mar 2, 11:43 AM EST	River Flood Warning	BOX	10 days
Mar 2, 1:27 PM EST	Areal Flood Warning	BOX	12 hr
Mar 3, 12:53 AM EST	Areal Flood Warning	BOX	3 hr
Mar 3, 5:05 AM EST	Areal Flood Warning	BOX	3 hr
Mar 3, 7:14 AM EST	Areal Flood Warning	BOX	8 hr
Mar 3, 2:05 PM EST	Areal Flood Warning	BOX	8 hr
Mar 5, 3:39 AM EST	Winter Storm Watch	BOX	35 hr
Mar 6, 12:22 PM EST	Flood Watch	BOX	25 hr
Mar 6, 2:26 PM EST	Winter Weather Advisory	BOX	44 hr
Mar 6, 2:33 PM EST	Wind Advisory	BOX	37 hr
Mar 7, 1:25 PM EST	Mesoscale Discussion	SPC	6 hr
Mar 7, 9:25 PM EST	Wind Advisory	BOX	7 hr
Mar 9, 8:26 AM EST	Special Weather Statement	BOX	3 hr
Mar 11, 3:51 AM EDT	Winter Storm Watch	BOX	24 hr
Mar 12, 3:46 AM EDT	Winter Storm Warning	BOX	46 hr
Mar 13, 5:47 AM EDT	Special Weather Statement	BOX	58 min
Mar 13, 6:48 AM EDT	Special Weather Statement	BOX	87 min
Mar 13, 7:08 AM EDT	Mesoscale Discussion	SPC	6 hr
Mar 19, 3:27 PM EDT	Winter Storm Watch	BOX	36 hr
Mar 20, 4:02 AM EDT	Winter Storm Warning	BOX	42 hr
Mar 20, 4:05 AM EDT	High Wind Watch	BOX	11 hr
Mar 20, 2:48 PM EDT	Winter Weather Advisory	BOX	38 hr
Mar 20, 2:53 PM EDT	Wind Advisory	BOX	43 hr
Mar 21, 8:57 PM EDT	Mesoscale Discussion	SPC	6 hr
Mar 30, 2:07 AM EDT	Dense Fog Advisory	BOX	8 hr
Apr 1, 3:59 PM EDT	Winter Weather Advisory	BOX	20 hr
Apr 3, 3:00 PM EDT	Wind Advisory	BOX	37 hr
Apr 3, 7:10 PM EDT	Dense Fog Advisory	BOX	21 hr
Apr 11, 2:23 AM EDT	Dense Fog Advisory	BOX	6 hr
Apr 13, 3:02 PM EDT	Winter Weather Advisory	BOX	67 hr
Apr 16, 9:51 AM EDT	Wind Advisory	BOX	10 hr
Apr 16, 3:42 PM EDT	Coastal Flood Advisory	BOX	7 hr
Apr 16, 5:14 PM EDT	Special Weather Statement	BOX	46 min
Apr 25, 7:21 PM EDT	Dense Fog Advisory	BOX	14 hr
May 8, 1:56 AM EDT	Dense Fog Advisory	BOX	8 hr
May 8, 3:36 PM EDT	Dense Fog Advisory	BOX	18 hr
May 9, 3:50 PM EDT	Dense Fog Advisory	BOX	12 hr
May 15, 1:58 PM EDT	Mesoscale Discussion	SPC	2 hr
May 15, 2:26 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
May 15, 6:14 PM EDT	Special Weather Statement	BOX	61 min
May 19, 7:27 PM EDT	Dense Fog Advisory	BOX	7 hr
May 29, 9:38 PM EDT	Dense Fog Advisory	BOX	8 hr
May 31, 2:23 AM EDT	Dense Fog Advisory	BOX	9 hr
Jun 1, 3:03 PM EDT	Dense Fog Advisory	BOX	19 hr
Jun 5, 3:57 PM EDT	Special Weather Statement	BOX	48 min
Jun 28, 10:03 AM EDT	Areal Flood Advisory	BOX	117 min
Jun 30, 4:16 PM EDT	Excessive Heat Warning	BOX	28 hr
Jun 30, 4:16 PM EDT	Heat Advisory	BOX	28 hr
Jul 1, 3:30 PM EDT	Heat Advisory	BOX	4 days
Jul 3, 4:04 AM EDT	Dense Fog Advisory	BOX	5 hr
Jul 5, 3:30 PM EDT	Flash Flood Watch	BOX	24 hr
Jul 6, 12:02 PM EDT	Special Weather Statement	BOX	88 min
Jul 17, 3:58 AM EDT	Heat Advisory	BOX	12 hr
Jul 17, 4:15 AM EDT	Flash Flood Watch	BOX	15 hr
Jul 17, 11:17 AM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jul 17, 2:19 PM EDT	Mesoscale Discussion	SPC	86 min
Jul 17, 5:06 PM EDT	Severe Thunderstorm Warning	BOX	39 min
Jul 17, 5:47 PM EDT	Severe Thunderstorm Warning	BOX	43 min
Jul 21, 3:13 PM EDT	High Surf Advisory	BOX	28 hr
Jul 23, 3:46 AM EDT	Rip Current Statement	BOX	15 hr
Jul 25, 9:39 AM EDT	Flash Flood Watch	BOX	18 hr
Jul 26, 5:32 PM EDT	Special Weather Statement	BOX	88 min
Jul 28, 9:42 PM EDT	Special Weather Statement	BOX	48 min
Aug 2, 3:28 AM EDT	Heat Advisory	BOX	15 hr
Aug 3, 3:30 AM EDT	Heat Advisory	BOX	15 hr
Aug 3, 2:41 PM EDT	Flash Flood Watch	BOX	25 hr
Aug 4, 10:00 AM EDT	Areal Flood Advisory	BOX	2 hr
Aug 4, 10:54 AM EDT	Areal Flood Advisory	BOX	2 hr
Aug 4, 11:14 AM EDT	Areal Flood Advisory	BOX	3 hr
Aug 4, 11:31 AM EDT	Flash Flood Warning	BOX	3 hr
Aug 4, 12:08 PM EDT	Flash Flood Warning	BOX	3 hr
Aug 4, 2:17 PM EDT	Flash Flood Warning	BOX	113 min
Aug 4, 2:42 PM EDT	Flash Flood Warning	BOX	45 min
Aug 5, 2:58 PM EDT	Heat Advisory	BOX	53 hr
Aug 8, 3:29 AM EDT	Heat Advisory	BOX	15 hr
Aug 9, 3:25 AM EDT	Heat Advisory	BOX	14 hr
Aug 10, 3:20 PM EDT	Flash Flood Watch	BOX	48 hr
Aug 11, 8:32 PM EDT	Areal Flood Advisory	BOX	58 min
Aug 12, 2:36 AM EDT	Areal Flood Advisory	BOX	54 min
Aug 12, 8:15 AM EDT	Areal Flood Advisory	BOX	60 min
Aug 12, 10:55 AM EDT	Areal Flood Advisory	BOX	2 hr
Aug 12, 3:18 PM EDT	Areal Flood Advisory	BOX	35 min
Aug 12, 4:04 PM EDT	Areal Flood Advisory	BOX	56 min
Aug 12, 5:03 PM EDT	Flash Flood Warning	BOX	78 min
Aug 14, 3:47 AM EDT	Dense Fog Advisory	BOX	5 hr
Aug 18, 12:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 18, 4:25 PM EDT	Areal Flood Advisory	BOX	2 hr
Aug 25, 4:21 AM EDT	Dense Fog Advisory	BOX	3 hr
Aug 27, 2:51 AM EDT	Excessive Heat Watch	BOX	24 hr
Aug 27, 2:51 AM EDT	Heat Advisory	BOX	66 hr
Aug 27, 3:20 PM EDT	Excessive Heat Warning	BOX	54 hr
Aug 30, 3:39 AM EDT	Heat Advisory	BOX	14 hr
Sep 2, 2:54 PM EDT	Heat Advisory	BOX	48 hr
Sep 5, 2:55 PM EDT	Heat Advisory	BOX	27 hr
Sep 6, 4:43 PM EDT	Severe Thunderstorm Warning	BOX	47 min
Sep 6, 5:08 PM EDT	Special Weather Statement	BOX	52 min
Sep 8, 3:52 PM EDT	High Surf Advisory	BOX	28 hr
Sep 10, 3:59 PM EDT	Coastal Flood Statement	BOX	7 hr
Sep 11, 3:54 AM EDT	High Surf Advisory	BOX	15 hr
Sep 11, 9:04 PM EDT	Dense Fog Advisory	BOX	12 hr
Sep 12, 1:13 PM EDT	Areal Flood Advisory	BOX	2 hr
Sep 12, 3:10 PM EDT	Flash Flood Watch	BOX	16 hr
Sep 12, 3:49 PM EDT	High Surf Advisory	BOX	48 hr
Sep 13, 3:39 AM EDT	Areal Flood Advisory	BOX	2 hr
Sep 13, 4:28 AM EDT	Areal Flood Advisory	BOX	2 hr
Sep 16, 4:04 AM EDT	Dense Fog Advisory	BOX	4 hr
Sep 17, 3:36 AM EDT	Flash Flood Watch	BOX	39 hr
Sep 18, 11:23 AM EDT	Flash Flood Warning	BOX	4 hr
Sep 18, 1:31 PM EDT	Flash Flood Warning	BOX	4 hr
Sep 18, 2:07 PM EDT	Special Weather Statement	BOX	38 min
Sep 18, 3:14 PM EDT	Areal Flood Warning	BOX	3 hr
Sep 25, 10:46 PM EDT	Areal Flood Advisory	BOX	59 min
Sep 25, 11:14 PM EDT	Areal Flood Advisory	BOX	2 hr
Sep 26, 1:44 AM EDT	Areal Flood Advisory	BOX	2 hr
Sep 27, 12:59 AM EDT	Special Weather Statement	BOX	31 min
Sep 27, 3:30 PM EDT	Flash Flood Watch	BOX	21 hr
Sep 28, 8:54 AM EDT	Special Weather Statement	BOX	81 min
Sep 28, 10:35 AM EDT	Special Weather Statement	BOX	85 min
Oct 10, 2:42 PM EDT	Flash Flood Watch	BOX	47 hr
Oct 11, 3:14 PM EDT	Wind Advisory	BOX	26 hr
Oct 11, 4:40 PM EDT	Severe Thunderstorm Warning	BOX	35 min
Oct 11, 5:00 PM EDT	Severe Thunderstorm Warning	BOX	30 min
Oct 12, 5:06 AM EDT	Areal Flood Advisory	BOX	3 hr
Oct 12, 6:54 AM EDT	Areal Flood Warning	BOX	4 hr
Oct 13, 4:13 AM EDT	Frost Advisory	BOX	29 hr
Oct 15, 8:44 PM EDT	Wind Advisory	BOX	9 hr
Oct 17, 2:51 AM EDT	Wind Advisory	BOX	31 hr
Oct 18, 3:42 AM EDT	Freeze Warning	BOX	29 hr
Oct 23, 2:46 PM EDT	Special Weather Statement	BOX	44 min
Oct 23, 3:32 PM EDT	Severe Thunderstorm Warning	BOX	28 min
Oct 23, 3:34 PM EDT	Tornado Warning	BOX	26 min
Oct 23, 3:46 PM EDT	Severe Thunderstorm Warning	BOX	29 min
Oct 23, 3:54 PM EDT	Mesoscale Discussion	SPC	66 min
Oct 23, 3:59 PM EDT	Tornado Warning	BOX	31 min
Oct 23, 4:24 PM EDT	Severe Thunderstorm Warning	BOX	23 min
Oct 23, 5:04 PM EDT	Special Weather Statement	BOX	26 min
Oct 26, 3:33 AM EDT	High Wind Watch	BOX	12 hr
Oct 26, 2:30 PM EDT	Flash Flood Watch	BOX	28 hr
Oct 26, 3:28 PM EDT	High Wind Warning	BOX	31 hr
Oct 26, 3:28 PM EDT	Wind Advisory	BOX	31 hr
Oct 29, 8:39 AM EDT	Mesoscale Discussion	SPC	3 hr
Oct 29, 9:12 AM EDT	Special Weather Statement	BOX	33 min
Oct 29, 9:31 AM EDT	Severe Thunderstorm Warning	BOX	15 min
Nov 2, 4:35 AM EDT	High Wind Watch	BOX	10 hr
Nov 2, 2:40 PM EDT	Wind Advisory	BOX	28 hr
Nov 3, 5:59 AM EDT	Areal Flood Advisory	BOX	3 hr
Nov 3, 6:33 AM EDT	Severe Thunderstorm Warning	BOX	27 min
Nov 8, 3:20 PM EST	Flood Watch	BOX	36 hr
Nov 9, 3:32 PM EST	Wind Advisory	BOX	27 hr
Nov 12, 10:23 PM EST	Flood Watch	BOX	14 hr
Nov 14, 3:31 PM EST	Winter Weather Advisory	BOX	34 hr
Nov 15, 11:19 AM EST	River Flood Warning	BOX	24 hr
Nov 15, 1:20 PM EST	Wind Advisory	BOX	20 hr
Nov 15, 4:39 PM EST	Mesoscale Discussion	SPC	6 hr
Nov 21, 5:19 PM EST	Special Weather Statement	BOX	56 min
Nov 26, 3:16 AM EST	Dense Fog Advisory	BOX	7 hr
Nov 26, 3:16 AM EST	Wind Advisory	BOX	36 hr
Nov 27, 12:24 PM EST	River Flood Warning	BOX	55 hr
Dec 19, 3:17 PM EST	High Wind Watch	BOX	24 hr
Dec 19, 3:18 PM EST	Flood Watch	BOX	58 hr
Dec 20, 3:16 PM EST	High Wind Warning	BOX	28 hr
Dec 20, 3:16 PM EST	Wind Advisory	BOX	31 hr
Dec 20, 3:22 PM EST	Coastal Flood Advisory	BOX	30 hr
Dec 21, 10:19 PM EST	Coastal Flood Advisory	BOX	15 hr
Dec 28, 10:06 PM EST	Dense Fog Advisory	BOX	8 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	10
Tornado Warning	2
Severe Thunderstorm Watch	2
Mesoscale Discussion	10
Special Weather Statement	19
Flooding
Areal Flood Warning	10
Flash Flood Warning	7
River Flood Warning	4
Flash Flood Watch	10
Flood Watch	7
Areal Flood Advisory	20
Winter
Blizzard Warning	1
Winter Storm Warning	4
Winter Storm Watch	5
Winter Weather Advisory	10
Heat
Excessive Heat Warning	2
Excessive Heat Watch	1
Heat Advisory	12
Cold
Freeze Warning	1
Wind Chill Watch	1
Frost Advisory	1
Wind Chill Advisory	1
Wind and dust
High Wind Warning	3
High Wind Watch	6
Wind Advisory	19
Fog and smoke
Dense Fog Advisory	22
Coast and beach
Coastal Flood Advisory	4
High Surf Advisory	4
Coastal Flood Statement	1
Rip Current Statement	1

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2017 2019

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.