Alert archive / Massachusetts / Norfolk County

Weather alerts in Norfolk County, Massachusetts, 2017

202 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 202
Warnings: 47
Watches: 22
Advisories: 80
Busiest month: March30 alerts
Busiest day: July 12, 201713 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, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	0			0
Severe thunderstorm warnings	10	8	20%	16	50%	22 min
Flash flood warnings	8	2	75%	3	33%	50 min

Each office's whole area, 2017

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Boston/Norton, MA: tornado warnings	0			2	0%
NWS Boston/Norton, MA: severe thunderstorm warnings	80	48	40%	305	68%	25 min
NWS Boston/Norton, MA: flash flood warnings	32	11	66%	91	84%	48 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 4, 7:48 PM EST	Special Weather Statement	BOX	57 min
Jan 4, 8:31 PM EST	Special Weather Statement	BOX	59 min
Jan 5, 3:49 PM EST	Winter Storm Watch	BOX	23 hr
Jan 6, 8:08 AM EST	Special Weather Statement	BOX	3 hr
Jan 6, 2:53 PM EST	Winter Storm Warning	BOX	34 hr
Jan 6, 10:54 PM EST	Blizzard Warning	BOX	26 hr
Jan 7, 11:27 AM EST	Mesoscale Discussion	SPC	4 hr
Jan 8, 7:53 PM EST	Special Weather Statement	BOX	52 min
Jan 21, 4:25 PM EST	High Wind Warning	BOX	65 hr
Jan 21, 4:47 PM EST	Flood Watch	BOX	65 hr
Jan 21, 7:52 PM EST	Dense Fog Advisory	BOX	14 hr
Jan 22, 3:51 AM EST	High Wind Watch	BOX	280 days
Jan 23, 4:00 AM EST	Coastal Flood Watch	BOX	14 hr
Jan 23, 4:00 AM EST	Coastal Flood Advisory	BOX	18 hr
Jan 23, 4:11 AM EST	Wind Advisory	BOX	31 hr
Jan 23, 5:31 PM EST	Coastal Flood Warning	BOX	18 hr
Jan 30, 3:41 PM EST	Winter Weather Advisory	BOX	32 hr
Feb 6, 4:34 AM EST	Winter Weather Advisory	BOX	50 hr
Feb 7, 2:51 PM EST	Winter Storm Watch	BOX	14 hr
Feb 7, 10:14 PM EST	Winter Weather Advisory	BOX	9 hr
Feb 8, 12:51 AM EST	Dense Fog Advisory	BOX	3 hr
Feb 8, 4:51 AM EST	Winter Storm Warning	BOX	38 hr
Feb 8, 4:56 AM EST	Dense Fog Advisory	BOX	5 hr
Feb 8, 2:17 PM EST	Blizzard Warning	BOX	32 hr
Feb 8, 3:47 PM EST	Coastal Flood Advisory	BOX	21 hr
Feb 9, 4:55 AM EST	Mesoscale Discussion	SPC	6 hr
Feb 9, 11:05 AM EST	Mesoscale Discussion	SPC	4 hr
Feb 9, 3:20 PM EST	Mesoscale Discussion	SPC	6 hr
Feb 9, 3:46 PM EST	Coastal Flood Advisory	BOX	6 hr
Feb 10, 3:27 PM EST	Winter Storm Watch	BOX	25 hr
Feb 11, 3:38 PM EST	Coastal Flood Watch	BOX	25 hr
Feb 11, 3:38 PM EST	Coastal Flood Advisory	BOX	22 hr
Feb 11, 4:29 PM EST	Blizzard Watch	BOX	24 hr
Feb 11, 4:29 PM EST	Winter Storm Warning	BOX	39 hr
Feb 11, 4:29 PM EST	Winter Weather Advisory	BOX	35 hr
Feb 12, 9:59 AM EST	Mesoscale Discussion	SPC	5 hr
Feb 12, 4:17 PM EST	Coastal Flood Warning	BOX	24 hr
Feb 12, 4:17 PM EST	Coastal Flood Advisory	BOX	23 hr
Feb 12, 4:34 PM EST	High Wind Warning	BOX	26 hr
Feb 15, 3:32 PM EST	Winter Weather Advisory	BOX	17 hr
Feb 24, 10:53 PM EST	Dense Fog Advisory	BOX	11 hr
Feb 25, 6:24 PM EST	Mesoscale Discussion	SPC	66 min
Mar 1, 3:13 AM EST	Wind Advisory	BOX	11 hr
Mar 1, 3:32 AM EST	Dense Fog Advisory	BOX	6 hr
Mar 1, 2:03 PM EST	High Wind Warning	BOX	28 hr
Mar 3, 8:01 PM EST	Special Weather Statement	BOX	59 min
Mar 3, 10:19 PM EST	Special Weather Statement	BOX	116 min
Mar 4, 12:50 PM EST	Wind Advisory	BOX	6 hr
Mar 8, 4:31 PM EST	Winter Storm Watch	BOX	24 hr
Mar 9, 4:00 AM EST	Wind Advisory	BOX	15 hr
Mar 9, 4:25 AM EST	Winter Storm Warning	BOX	36 hr
Mar 9, 4:25 AM EST	Winter Weather Advisory	BOX	34 hr
Mar 9, 10:09 AM EST	High Wind Warning	BOX	5 hr
Mar 11, 10:13 AM EST	Wind Advisory	BOX	10 hr
Mar 11, 5:14 PM EST	Blizzard Watch	BOX	46 hr
Mar 11, 5:14 PM EST	Winter Storm Watch	BOX	46 hr
Mar 12, 3:36 PM EDT	Winter Storm Warning	BOX	49 hr
Mar 12, 3:47 PM EDT	Coastal Flood Watch	BOX	13 hr
Mar 13, 3:42 AM EDT	High Wind Warning	BOX	38 hr
Mar 13, 4:41 AM EDT	Coastal Flood Warning	BOX	35 hr
Mar 13, 4:41 AM EDT	Coastal Flood Advisory	BOX	32 hr
Mar 14, 3:11 PM EDT	Areal Flood Advisory	BOX	3 hr
Mar 14, 3:29 PM EDT	Coastal Flood Advisory	BOX	12 hr
Mar 14, 6:02 PM EDT	High Wind Warning	BOX	3 hr
Mar 21, 3:23 PM EDT	Wind Advisory	BOX	28 hr
Mar 24, 1:44 PM EDT	Special Weather Statement	BOX	61 min
Mar 29, 3:51 PM EDT	Winter Storm Watch	BOX	36 hr
Mar 30, 3:59 PM EDT	Winter Weather Advisory	BOX	47 hr
Mar 31, 3:48 AM EDT	Winter Storm Warning	BOX	36 hr
Mar 31, 3:50 AM EDT	Wind Advisory	BOX	42 hr
Mar 31, 4:03 PM EDT	Coastal Flood Advisory	BOX	14 hr
Mar 31, 4:03 PM EDT	Coastal Flood Advisory	BOX	26 hr
Apr 1, 8:11 AM EDT	Areal Flood Warning	BOX	4 hr
Apr 4, 3:38 PM EDT	Flood Watch	BOX	59 hr
Apr 6, 10:52 PM EDT	River Flood Warning	BOX	27 hr
Apr 25, 4:51 AM EDT	Coastal Flood Statement	BOX	20 hr
Apr 26, 3:18 AM EDT	Coastal Flood Statement	BOX	11 hr
Apr 26, 3:48 PM EDT	Dense Fog Advisory	BOX	15 hr
Apr 26, 4:25 PM EDT	Coastal Flood Statement	BOX	9 hr
Apr 27, 3:59 PM EDT	Coastal Flood Statement	BOX	12 hr
Apr 28, 3:32 AM EDT	Coastal Flood Statement	BOX	23 hr
May 3, 4:21 AM EDT	Frost Advisory	BOX	27 hr
May 5, 4:13 AM EDT	Flood Watch	BOX	24 hr
May 5, 4:46 PM EDT	Special Weather Statement	BOX	44 min
May 5, 5:17 PM EDT	Special Weather Statement	BOX	43 min
May 5, 5:25 PM EDT	Flash Flood Warning	BOX	2 hr
May 5, 5:51 PM EDT	Flash Flood Warning	BOX	114 min
May 8, 11:42 PM EDT	Frost Advisory	BOX	7 hr
May 13, 3:46 PM EDT	Wind Advisory	BOX	30 hr
May 18, 10:41 PM EDT	Special Weather Statement	BOX	49 min
May 19, 12:04 AM EDT	Severe Thunderstorm Warning	BOX	27 min
May 24, 7:18 PM EDT	Coastal Flood Statement	BOX	6 hr
May 25, 4:22 AM EDT	Coastal Flood Advisory	BOX	23 hr
May 26, 3:47 PM EDT	Coastal Flood Statement	BOX	10 hr
May 27, 2:19 PM EDT	Coastal Flood Statement	BOX	13 hr
May 28, 2:52 PM EDT	Coastal Flood Statement	BOX	13 hr
May 31, 6:08 AM EDT	Dense Fog Advisory	BOX	4 hr
Jun 1, 12:06 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 1, 2:48 PM EDT	Special Weather Statement	BOX	27 min
Jun 2, 5:03 PM EDT	Special Weather Statement	BOX	27 min
Jun 13, 7:56 AM EDT	Heat Advisory	BOX	10 hr
Jun 13, 2:25 PM EDT	Mesoscale Discussion	SPC	3 hr
Jun 13, 5:55 PM EDT	Severe Thunderstorm Warning	BOX	35 min
Jun 16, 5:41 PM EDT	Areal Flood Advisory	BOX	2 hr
Jun 16, 7:40 PM EDT	Areal Flood Advisory	BOX	2 hr
Jun 23, 3:58 PM EDT	Coastal Flood Statement	BOX	9 hr
Jun 24, 4:14 AM EDT	Coastal Flood Statement	BOX	21 hr
Jun 25, 3:38 PM EDT	Coastal Flood Statement	BOX	13 hr
Jun 27, 12:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 27, 7:56 PM EDT	Severe Thunderstorm Warning	BOX	49 min
Jun 27, 8:17 PM EDT	Special Weather Statement	BOX	43 min
Jun 27, 8:38 PM EDT	Special Weather Statement	BOX	52 min
Jul 6, 3:53 PM EDT	Flash Flood Watch	BOX	25 hr
Jul 8, 11:09 AM EDT	Mesoscale Discussion	SPC	3 hr
Jul 8, 5:52 PM EDT	Special Weather Statement	BOX	38 min
Jul 8, 7:04 PM EDT	Special Weather Statement	BOX	41 min
Jul 8, 7:39 PM EDT	Special Weather Statement	BOX	51 min
Jul 11, 6:22 AM EDT	Special Weather Statement	BOX	38 min
Jul 12, 10:15 AM EDT	Flash Flood Watch	BOX	11 hr
Jul 12, 12:24 PM EDT	Severe Thunderstorm Warning	BOX	51 min
Jul 12, 12:44 PM EDT	Areal Flood Advisory	BOX	61 min
Jul 12, 12:46 PM EDT	Severe Thunderstorm Warning	BOX	44 min
Jul 12, 12:51 PM EDT	Mesoscale Discussion	SPC	114 min
Jul 12, 1:39 PM EDT	Severe Thunderstorm Warning	BOX	51 min
Jul 12, 1:52 PM EDT	Areal Flood Advisory	BOX	53 min
Jul 12, 2:53 PM EDT	Flash Flood Warning	BOX	112 min
Jul 12, 3:04 PM EDT	Areal Flood Advisory	BOX	56 min
Jul 12, 4:18 PM EDT	Areal Flood Advisory	BOX	57 min
Jul 12, 6:20 PM EDT	Severe Thunderstorm Warning	BOX	25 min
Jul 12, 6:29 PM EDT	Flash Flood Warning	BOX	2 hr
Jul 12, 6:39 PM EDT	Special Weather Statement	BOX	36 min
Jul 12, 8:16 PM EDT	Areal Flood Warning	BOX	3 hr
Jul 18, 4:11 PM EDT	Special Weather Statement	BOX	49 min
Jul 20, 4:17 AM EDT	Heat Advisory	BOX	14 hr
Jul 23, 4:20 PM EDT	Coastal Flood Advisory	BOX	10 hr
Jul 24, 4:16 AM EDT	Coastal Flood Advisory	BOX	23 hr
Aug 1, 6:56 PM EDT	Special Weather Statement	BOX	34 min
Aug 2, 11:55 AM EDT	Flash Flood Watch	BOX	8 hr
Aug 2, 1:30 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 2, 2:00 PM EDT	Special Weather Statement	BOX	45 min
Aug 2, 2:05 PM EDT	Flash Flood Warning	BOX	3 hr
Aug 2, 5:09 PM EDT	Severe Thunderstorm Warning	BOX	38 min
Aug 2, 5:17 PM EDT	Flash Flood Warning	BOX	118 min
Aug 2, 6:15 PM EDT	Special Weather Statement	BOX	45 min
Aug 2, 6:36 PM EDT	Special Weather Statement	BOX	39 min
Aug 2, 6:44 PM EDT	Flash Flood Warning	BOX	2 hr
Aug 22, 10:53 PM EDT	Mesoscale Discussion	SPC	97 min
Sep 5, 3:40 PM EDT	Flash Flood Watch	BOX	37 hr
Sep 6, 10:42 AM EDT	Severe Thunderstorm Warning	BOX	33 min
Sep 6, 11:10 AM EDT	Severe Thunderstorm Warning	BOX	35 min
Sep 15, 11:08 PM EDT	Dense Fog Advisory	BOX	9 hr
Sep 16, 6:54 PM EDT	Dense Fog Advisory	BOX	13 hr
Sep 17, 4:55 PM EDT	Tropical Storm Watch	BOX	19 hr
Sep 17, 6:44 PM EDT	Dense Fog Advisory	BOX	7 hr
Sep 18, 11:14 AM EDT	Tropical Storm Warning	BOX	4 days
Sep 18, 4:22 PM EDT	High Surf Advisory	BOX	11 days
Sep 18, 5:23 PM EDT	Dense Fog Advisory	BOX	12 hr
Sep 19, 5:28 PM EDT	Coastal Flood Advisory	BOX	59 hr
Sep 19, 6:45 PM EDT	Wind Advisory	BOX	70 hr
Sep 22, 10:59 AM EDT	Coastal Flood Advisory	BOX	5 hr
Sep 25, 8:26 PM EDT	Dense Fog Advisory	BOX	12 hr
Sep 26, 9:17 PM EDT	Dense Fog Advisory	BOX	14 hr
Sep 27, 6:58 PM EDT	Dense Fog Advisory	BOX	12 hr
Sep 30, 9:00 AM EDT	Areal Flood Advisory	BOX	2 hr
Oct 6, 11:10 PM EDT	Dense Fog Advisory	BOX	13 hr
Oct 12, 4:26 AM EDT	Frost Advisory	BOX	27 hr
Oct 14, 6:17 PM EDT	Dense Fog Advisory	BOX	15 hr
Oct 16, 4:16 AM EDT	Frost Advisory	BOX	28 hr
Oct 23, 3:23 AM EDT	Dense Fog Advisory	BOX	7 hr
Oct 23, 4:01 PM EDT	Flash Flood Watch	BOX	52 hr
Oct 23, 4:04 PM EDT	Wind Advisory	BOX	40 hr
Oct 24, 8:55 PM EDT	Mesoscale Discussion	SPC	65 min
Oct 25, 3:19 AM EDT	Areal Flood Advisory	BOX	116 min
Oct 25, 5:14 AM EDT	Areal Flood Advisory	BOX	2 hr
Oct 25, 7:05 AM EDT	Areal Flood Advisory	BOX	115 min
Oct 25, 7:31 AM EDT	Areal Flood Advisory	BOX	119 min
Oct 26, 1:49 PM EDT	Wind Advisory	BOX	11 hr
Oct 28, 3:27 AM EDT	Flash Flood Watch	BOX	50 hr
Oct 28, 4:31 PM EDT	High Wind Warning	BOX	45 hr
Oct 29, 12:21 PM EDT	Coastal Flood Statement	BOX	22 hr
Oct 29, 11:04 PM EDT	Areal Flood Warning	BOX	6 hr
Oct 30, 12:24 AM EDT	Areal Flood Warning	BOX	3 hr
Oct 30, 2:26 AM EDT	Flash Flood Warning	BOX	3 hr
Oct 30, 4:08 AM EDT	Areal Flood Warning	BOX	112 min
Oct 30, 4:15 AM EDT	Wind Advisory	BOX	13 hr
Oct 30, 4:21 AM EDT	Areal Flood Warning	BOX	3 hr
Oct 31, 3:24 AM EDT	Frost Advisory	BOX	30 hr
Nov 5, 10:55 AM EST	Coastal Flood Statement	BOX	65 min
Nov 8, 3:34 AM EST	Freeze Warning	BOX	28 hr
Nov 9, 3:35 AM EST	Wind Advisory	BOX	36 hr
Nov 16, 5:10 PM EST	Special Weather Statement	BOX	65 min
Nov 18, 3:57 AM EST	Wind Advisory	BOX	39 hr
Nov 18, 3:10 PM EST	Wind Advisory	BOX	27 hr
Dec 5, 4:23 AM EST	Coastal Flood Advisory	BOX	10 hr
Dec 8, 3:41 AM EST	Winter Weather Advisory	BOX	48 hr
Dec 8, 3:49 PM EST	Winter Storm Warning	BOX	33 hr
Dec 12, 4:07 PM EST	Wind Advisory	BOX	30 hr
Dec 21, 4:01 AM EST	Winter Weather Advisory	BOX	62 hr
Dec 24, 2:58 AM EST	High Wind Warning	BOX	38 hr
Dec 24, 2:58 AM EST	Wind Advisory	BOX	38 hr
Dec 24, 3:03 AM EST	Winter Weather Advisory	BOX	33 hr
Dec 27, 4:06 AM EST	Wind Chill Advisory	BOX	48 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
Mesoscale Discussion	14
Special Weather Statement	25
Flooding
Areal Flood Warning	6
Flash Flood Warning	8
River Flood Warning	1
Flash Flood Watch	6
Flood Watch	3
Areal Flood Advisory	12
Winter
Blizzard Warning	2
Winter Storm Warning	7
Blizzard Watch	2
Winter Storm Watch	6
Winter Weather Advisory	10
Heat
Heat Advisory	2
Cold
Freeze Warning	1
Frost Advisory	5
Wind Chill Advisory	1
Wind and dust
High Wind Warning	8
High Wind Watch	1
Wind Advisory	17
Fog and smoke
Dense Fog Advisory	17
Tropical
Tropical Storm Warning	1
Tropical Storm Watch	1
Coast and beach
Coastal Flood Warning	3
Coastal Flood Watch	3
Coastal Flood Advisory	15
High Surf Advisory	1
Coastal Flood Statement	14

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive 2016 2018

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.