Alert archive / Massachusetts / Severe Thunderstorm Warnings

Severe Thunderstorm Warnings in Massachusetts, 2010

135 severe thunderstorm warnings in 2010. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of severe thunderstorm warnings reaches back to 1986.

Severe Thunderstorm Warnings by county

Each county as a circle sized by its count in 2010. Tap one for its archive.

Severe Thunderstorm Warnings: 135
Busiest month: June52 severe thunderstorm warnings
Busiest day: July 21, 201011 severe thunderstorm warnings

Over time

By month

Warning verification

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

102 of 138 severe thunderstorm warnings covering Massachusetts in 2010 had a qualifying storm report inside them; 263 of 337 hail, wind and damage reports fell inside a warning, on average 21 minutes after it went out.

Massachusetts, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Severe thunderstorm warnings	138	102	26%	337	78%	21 min

Each office's whole area, 2010

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Albany, NY: severe thunderstorm warnings	102	69	32%	217	87%	24 min
NWS Boston/Norton, MA: severe thunderstorm warnings	137	99	28%	426	77%	22 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	Counties	Lasted
Apr 22, 3:15 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Essex	42 days
Apr 22, 3:20 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	55 min
May 4, 3:12 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	63 min
May 4, 3:21 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	39 min
May 4, 3:22 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	53 min
May 4, 3:37 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	38 min
May 4, 4:05 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	40 min
May 4, 4:29 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	61 min
May 4, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Franklin, Middlesex, Norfolk, Plymouth, Suffolk and 1 more	52 min
May 4, 4:48 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Worcester	57 min
May 4, 4:55 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Worcester	65 min
May 8, 6:38 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	49 min
May 26, 9:33 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	28 min
May 26, 10:19 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	56 min
May 26, 10:34 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	36 min
May 26, 10:37 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	53 min
May 26, 11:06 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	29 min
May 26, 11:14 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	36 min
May 26, 11:25 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	65 min
May 26, 11:27 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	23 min
May 26, 11:39 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	66 min
May 26, 11:57 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	63 min
May 29, 4:09 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	36 min
May 29, 4:42 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	48 min
May 29, 4:52 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	47 min
May 29, 5:08 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	41 min
Jun 1, 2:37 AM EDT	Severe Thunderstorm Warning	BOX	Worcester	23 min
Jun 1, 2:52 AM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth, Suffolk	23 min
Jun 1, 3:03 AM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Worcester	42 min
Jun 1, 2:48 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	42 min
Jun 1, 3:06 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Suffolk	30 min
Jun 1, 3:37 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth	47 min
Jun 3, 5:05 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	55 min
Jun 3, 5:34 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Worcester	41 min
Jun 3, 6:08 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk	22 min
Jun 3, 6:21 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Suffolk	24 min
Jun 3, 8:23 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	30 min
Jun 5, 2:19 AM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	26 min
Jun 5, 7:53 AM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	52 min
Jun 5, 1:58 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	62 min
Jun 5, 2:35 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	44 min
Jun 5, 2:45 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	53 min
Jun 5, 3:08 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	31 min
Jun 5, 4:20 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	40 min
Jun 5, 4:46 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	36 min
Jun 5, 5:00 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Middlesex, Norfolk, Plymouth, Worcester	21 min
Jun 5, 5:11 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	35 min
Jun 6, 12:27 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	63 min
Jun 6, 12:30 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	60 min
Jun 6, 1:00 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	45 min
Jun 6, 1:54 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	51 min
Jun 6, 2:49 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	26 min
Jun 6, 2:57 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	33 min
Jun 6, 3:01 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	44 min
Jun 6, 3:21 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	24 min
Jun 6, 3:43 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Suffolk, Worcester	32 min
Jun 6, 4:12 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Suffolk	33 min
Jun 10, 2:26 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	64 min
Jun 10, 5:51 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	24 min
Jun 10, 6:12 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	33 min
Jun 10, 6:28 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	47 min
Jun 20, 2:55 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	50 min
Jun 20, 3:14 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	34 min
Jun 20, 3:43 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	47 min
Jun 24, 2:10 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	65 min
Jun 24, 2:47 PM EDT	Severe Thunderstorm Warning	BOX	Franklin	21 min
Jun 24, 3:35 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	40 min
Jun 24, 4:03 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Middlesex, Worcester	42 min
Jun 24, 4:34 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Worcester	56 min
Jun 24, 5:01 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Plymouth, Suffolk	59 min
Jun 24, 5:11 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	22 min
Jun 24, 6:20 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Plymouth, Suffolk	25 min
Jun 27, 3:07 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Suffolk	23 min
Jun 27, 4:39 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	66 min
Jun 27, 4:48 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth	27 min
Jun 27, 5:10 PM EDT	Severe Thunderstorm Warning	BOX	Plymouth	32 min
Jun 28, 4:52 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	38 min
Jun 28, 5:38 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Plymouth	31 min
Jul 12, 2:04 PM EDT	Severe Thunderstorm Warning	BOX	Essex	26 min
Jul 12, 4:16 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	44 min
Jul 16, 6:28 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Middlesex, Worcester	35 min
Jul 16, 6:41 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	51 min
Jul 16, 6:45 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	45 min
Jul 16, 7:02 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	32 min
Jul 16, 7:18 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	42 min
Jul 16, 7:30 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire, Worcester	60 min
Jul 16, 7:30 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Norfolk, Suffolk, Worcester	45 min
Jul 16, 7:51 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	43 min
Jul 16, 8:07 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Middlesex, Worcester	53 min
Jul 16, 8:26 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	37 min
Jul 17, 5:28 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire	32 min
Jul 17, 5:55 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	65 min
Jul 17, 7:26 PM EDT	Severe Thunderstorm Warning	BOX	Hampden	45 min
Jul 17, 8:57 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	63 min
Jul 17, 9:21 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	39 min
Jul 17, 9:24 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	51 min
Jul 17, 9:58 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	47 min
Jul 17, 11:16 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	59 min
Jul 17, 11:51 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	24 min
Jul 19, 11:25 AM EDT	Severe Thunderstorm Warning	BOX	Bristol	47 min
Jul 19, 4:18 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	30 min
Jul 19, 6:47 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	43 min
Jul 19, 7:26 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	49 min
Jul 19, 8:08 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	52 min
Jul 19, 8:17 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	43 min
Jul 19, 8:26 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	19 min
Jul 19, 8:30 PM EDT	Severe Thunderstorm Warning	BOX	Essex	37 min
Jul 19, 9:02 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Worcester	38 min
Jul 21, 1:24 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	66 min
Jul 21, 2:20 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	55 min
Jul 21, 2:27 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire	63 min
Jul 21, 2:29 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	34 min
Jul 21, 3:11 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	52 min
Jul 21, 3:13 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Worcester	47 min
Jul 21, 3:28 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	47 min
Jul 21, 4:13 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampshire, Worcester	62 min
Jul 21, 4:27 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	46 min
Jul 21, 4:33 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Norfolk, Worcester	42 min
Jul 21, 5:17 PM EDT	Severe Thunderstorm Warning	BOX	Middlesex, Norfolk, Worcester	14 min
Jul 21, 9:34 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	56 min
Jul 21, 10:31 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	44 min
Jul 21, 11:14 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Worcester	46 min
Jul 24, 3:50 PM EDT	Severe Thunderstorm Warning	BOX	Bristol	40 min
Aug 5, 9:45 AM EDT	Severe Thunderstorm Warning	BOX	Bristol	45 min
Aug 5, 12:44 PM EDT	Severe Thunderstorm Warning	BOX	Nantucket	31 min
Aug 5, 4:28 PM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk	34 min
Aug 5, 5:10 PM EDT	Severe Thunderstorm Warning	BOX	Norfolk, Plymouth	21 min
Aug 16, 1:58 PM EDT	Severe Thunderstorm Warning	ALY	Berkshire	62 min
Aug 16, 2:12 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Hampden, Hampshire	48 min
Aug 16, 3:26 PM EDT	Severe Thunderstorm Warning	BOX	Hampden, Hampshire, Worcester	64 min
Aug 17, 3:08 AM EDT	Severe Thunderstorm Warning	BOX	Bristol, Norfolk, Plymouth	37 min
Sep 13, 4:34 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	41 min
Sep 13, 5:14 PM EDT	Severe Thunderstorm Warning	BOX	Franklin, Worcester	46 min
Sep 13, 5:59 PM EDT	Severe Thunderstorm Warning	BOX	Worcester	46 min
Oct 1, 9:51 AM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	24 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2009 2011

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.