Alert archive / Massachusetts / Hampden County

Weather alerts in Hampden County, Massachusetts, 2020

194 weather alerts in 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Hampden County and its neighbors

Each county as a circle sized by its count in 2020. Tap one for its archive.

Alerts: 194
Warnings: 60
Watches: 23
Advisories: 33
Busiest month: August45 alerts
Busiest day: August 2, 20209 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 Hampden County in 2020 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 5 minutes after it went out.

Hampden County, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
Tornado warnings	2	1	50%	1	100%	5 min
Severe thunderstorm warnings	39	31	21%	41	76%	25 min
Flash flood warnings	2	1	50%	1	100%	29 min

Each office's whole area, 2020

	Warnings	With a report	False alarm ratio	Reports	Inside a warning	Mean lead time
NWS Boston/Norton, MA: tornado warnings	8	1	88%	2	50%	5 min
NWS Boston/Norton, MA: severe thunderstorm warnings	152	115	24%	525	85%	26 min
NWS Boston/Norton, MA: flash flood warnings	16	2	88%	5	60%	16 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
Dec 31, 9:20 PM EST	Special Weather Statement	BOX	85 min
Dec 31, 9:36 PM EST	Special Weather Statement	BOX	54 min
Jan 7, 3:58 PM EST	Wind Advisory	BOX	31 hr
Jan 8, 5:18 PM EST	Special Weather Statement	BOX	57 min
Jan 11, 1:08 PM EST	Wind Advisory	BOX	27 hr
Jan 15, 3:47 PM EST	Wind Advisory	BOX	36 hr
Jan 17, 3:35 AM EST	Winter Storm Watch	BOX	12 hr
Jan 17, 3:58 PM EST	Winter Storm Warning	BOX	36 hr
Jan 17, 3:58 PM EST	Winter Weather Advisory	BOX	38 hr
Feb 5, 3:35 AM EST	Winter Weather Advisory	BOX	61 hr
Feb 6, 3:23 PM EST	Wind Advisory	BOX	30 hr
Feb 12, 3:32 AM EST	Winter Weather Advisory	BOX	32 hr
Feb 18, 2:55 AM EST	Winter Weather Advisory	BOX	14 hr
Feb 26, 4:24 PM EST	Wind Advisory	BOX	32 hr
Mar 13, 3:10 PM EDT	Special Weather Statement	BOX	80 min
Mar 22, 3:46 AM EDT	Winter Storm Watch	BOX	12 hr
Mar 22, 3:29 PM EDT	Winter Storm Warning	BOX	37 hr
Mar 22, 3:29 PM EDT	Winter Weather Advisory	BOX	37 hr
Mar 23, 3:26 PM EDT	Mesoscale Discussion	SPC	6 hr
Apr 9, 4:10 AM EDT	Wind Advisory	BOX	18 hr
Apr 9, 1:41 PM EDT	Special Weather Statement	BOX	64 min
Apr 11, 3:29 PM EDT	High Wind Watch	BOX	25 hr
Apr 12, 4:07 PM EDT	High Wind Warning	BOX	28 hr
Apr 12, 4:07 PM EDT	Wind Advisory	BOX	27 hr
Apr 13, 2:42 PM EDT	Mesoscale Discussion	SPC	93 min
Apr 17, 3:51 AM EDT	Winter Weather Advisory	BOX	30 hr
Apr 17, 2:36 PM EDT	Winter Storm Warning	BOX	19 hr
Apr 20, 3:36 PM EDT	Wind Advisory	BOX	28 hr
May 1, 4:07 PM EDT	Special Weather Statement	BOX	38 min
May 8, 3:42 PM EDT	Wind Advisory	BOX	34 hr
May 9, 3:37 AM EDT	Freeze Warning	BOX	27 hr
May 10, 3:57 PM EDT	Freeze Watch	BOX	22 hr
May 11, 3:34 PM EDT	Special Weather Statement	BOX	26 min
May 11, 6:01 PM EDT	Special Weather Statement	BOX	44 min
May 11, 7:24 PM EDT	Severe Thunderstorm Warning	BOX	25 min
May 12, 1:14 PM EDT	Freeze Warning	BOX	19 hr
May 13, 1:43 PM EDT	Freeze Warning	BOX	18 hr
May 15, 3:32 PM EDT	Tornado Watch	SPC	6 hr
May 15, 4:58 PM EDT	Mesoscale Discussion	SPC	92 min
May 15, 5:19 PM EDT	Special Weather Statement	BOX	41 min
May 15, 7:17 PM EDT	Severe Thunderstorm Warning	BOX	58 min
May 15, 8:06 PM EDT	Severe Thunderstorm Warning	BOX	54 min
May 15, 8:15 PM EDT	Severe Thunderstorm Warning	BOX	60 min
May 15, 8:34 PM EDT	Severe Thunderstorm Warning	BOX	41 min
May 15, 9:09 PM EDT	Mesoscale Discussion	SPC	66 min
Jun 6, 10:46 AM EDT	Mesoscale Discussion	SPC	119 min
Jun 6, 12:23 PM EDT	Severe Thunderstorm Watch	SPC	8 hr
Jun 6, 12:51 PM EDT	Special Weather Statement	BOX	39 min
Jun 6, 1:42 PM EDT	Special Weather Statement	BOX	48 min
Jun 6, 2:09 PM EDT	Special Weather Statement	BOX	51 min
Jun 6, 2:15 PM EDT	Severe Thunderstorm Warning	BOX	60 min
Jun 6, 2:20 PM EDT	Mesoscale Discussion	SPC	85 min
Jun 6, 2:39 PM EDT	Severe Thunderstorm Warning	BOX	66 min
Jun 28, 12:37 PM EDT	Mesoscale Discussion	SPC	113 min
Jun 28, 1:32 PM EDT	Severe Thunderstorm Watch	SPC	6 hr
Jun 28, 2:45 PM EDT	Special Weather Statement	BOX	45 min
Jun 28, 3:16 PM EDT	Severe Thunderstorm Warning	BOX	59 min
Jun 28, 4:08 PM EDT	Mesoscale Discussion	SPC	2 hr
Jun 28, 4:46 PM EDT	Special Weather Statement	BOX	44 min
Jun 28, 5:02 PM EDT	Severe Thunderstorm Warning	BOX	58 min
Jun 28, 7:20 PM EDT	Mesoscale Discussion	SPC	55 min
Jun 29, 2:37 PM EDT	Severe Thunderstorm Warning	BOX	38 min
Jun 29, 2:48 PM EDT	Mesoscale Discussion	SPC	117 min
Jun 29, 3:06 PM EDT	Severe Thunderstorm Warning	BOX	36 min
Jul 1, 7:03 PM EDT	Severe Thunderstorm Warning	BOX	31 min
Jul 2, 5:35 PM EDT	Severe Thunderstorm Warning	BOX	55 min
Jul 2, 6:30 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 6, 7:09 PM EDT	Severe Thunderstorm Warning	BOX	66 min
Jul 6, 7:36 PM EDT	Special Weather Statement	BOX	24 min
Jul 6, 7:45 PM EDT	Special Weather Statement	BOX	30 min
Jul 6, 7:57 PM EDT	Severe Thunderstorm Warning	BOX	63 min
Jul 6, 8:01 PM EDT	Flash Flood Warning	BOX	109 min
Jul 6, 8:33 PM EDT	Special Weather Statement	BOX	27 min
Jul 6, 8:45 PM EDT	Special Weather Statement	BOX	30 min
Jul 8, 4:01 PM EDT	Mesoscale Discussion	SPC	89 min
Jul 9, 4:06 PM EDT	Flash Flood Watch	BOX	29 hr
Jul 13, 12:54 PM EDT	Mesoscale Discussion	SPC	96 min
Jul 13, 1:17 PM EDT	Special Weather Statement	BOX	43 min
Jul 13, 5:46 PM EDT	Special Weather Statement	BOX	44 min
Jul 13, 6:19 PM EDT	Severe Thunderstorm Warning	BOX	56 min
Jul 13, 7:06 PM EDT	Severe Thunderstorm Warning	BOX	54 min
Jul 13, 8:12 PM EDT	Special Weather Statement	BOX	63 min
Jul 13, 8:31 PM EDT	Severe Thunderstorm Warning	BOX	41 min
Jul 14, 12:05 PM EDT	Severe Thunderstorm Warning	BOX	55 min
Jul 14, 12:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 14, 1:08 PM EDT	Severe Thunderstorm Warning	BOX	67 min
Jul 14, 1:53 PM EDT	Special Weather Statement	BOX	37 min
Jul 18, 3:23 AM EDT	Heat Advisory	BOX	65 hr
Jul 18, 4:22 AM EDT	Dense Fog Advisory	BOX	4 hr
Jul 22, 1:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 22, 2:57 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 22, 5:49 PM EDT	Special Weather Statement	BOX	56 min
Jul 22, 6:51 PM EDT	Severe Thunderstorm Warning	BOX	54 min
Jul 22, 7:01 PM EDT	Mesoscale Discussion	SPC	119 min
Jul 23, 12:05 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 23, 12:58 PM EDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 23, 2:33 PM EDT	Severe Thunderstorm Warning	BOX	43 min
Jul 23, 4:28 PM EDT	Mesoscale Discussion	SPC	2 hr
Jul 23, 6:03 PM EDT	Special Weather Statement	BOX	27 min
Jul 23, 6:48 PM EDT	Mesoscale Discussion	SPC	57 min
Jul 26, 3:47 AM EDT	Excessive Heat Watch	BOX	11 hr
Jul 26, 3:05 PM EDT	Heat Advisory	BOX	52 hr
Jul 29, 11:41 PM EDT	Severe Thunderstorm Warning	BOX	34 min
Jul 30, 1:20 PM EDT	Mesoscale Discussion	SPC	115 min
Jul 30, 6:20 PM EDT	Special Weather Statement	BOX	40 min
Aug 2, 1:36 PM EDT	Special Weather Statement	BOX	39 min
Aug 2, 2:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 2, 2:17 PM EDT	Severe Thunderstorm Warning	BOX	58 min
Aug 2, 3:10 PM EDT	Tornado Watch	SPC	7 hr
Aug 2, 6:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 2, 6:46 PM EDT	Severe Thunderstorm Warning	BOX	59 min
Aug 2, 6:55 PM EDT	Tornado Warning	BOX	35 min
Aug 2, 7:28 PM EDT	Tornado Warning Tornado observed	BOX	32 min
Aug 2, 7:54 PM EDT	Severe Thunderstorm Warning	BOX	39 min
Aug 3, 5:18 AM EDT	Tropical Storm Watch	BOX	8 hr
Aug 3, 11:11 AM EDT	Tropical Storm Warning	BOX	36 hr
Aug 3, 3:02 PM EDT	Flash Flood Watch	BOX	27 hr
Aug 4, 6:45 AM EDT	Mesoscale Discussion	SPC	3 hr
Aug 4, 11:34 AM EDT	Mesoscale Discussion	SPC	86 min
Aug 4, 12:43 PM EDT	Tornado Watch	SPC	6 hr
Aug 4, 3:05 PM EDT	Mesoscale Discussion	SPC	85 min
Aug 9, 3:35 PM EDT	Heat Advisory	BOX	3 days
Aug 10, 5:40 PM EDT	Special Weather Statement	BOX	35 min
Aug 10, 6:06 PM EDT	Special Weather Statement	BOX	24 min
Aug 10, 6:30 PM EDT	Severe Thunderstorm Warning	BOX	28 min
Aug 11, 3:10 PM EDT	Special Weather Statement	BOX	50 min
Aug 12, 1:53 AM EDT	Special Weather Statement	BOX	52 min
Aug 17, 7:56 PM EDT	Special Weather Statement	BOX	49 min
Aug 17, 8:56 PM EDT	Special Weather Statement	BOX	49 min
Aug 17, 9:27 PM EDT	Special Weather Statement	BOX	48 min
Aug 19, 4:27 PM EDT	Special Weather Statement	BOX	48 min
Aug 22, 1:18 PM EDT	Mesoscale Discussion	SPC	87 min
Aug 23, 2:08 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 23, 5:28 PM EDT	Severe Thunderstorm Warning	BOX	62 min
Aug 23, 6:32 PM EDT	Severe Thunderstorm Warning	BOX	58 min
Aug 23, 6:55 PM EDT	Flash Flood Warning	BOX	2 hr
Aug 23, 7:22 PM EDT	Severe Thunderstorm Warning	BOX	53 min
Aug 23, 9:01 PM EDT	Special Weather Statement	BOX	44 min
Aug 23, 9:12 PM EDT	Areal Flood Warning	BOX	2 hr
Aug 24, 2:00 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 24, 2:06 PM EDT	Special Weather Statement	BOX	39 min
Aug 25, 2:09 PM EDT	Mesoscale Discussion	SPC	96 min
Aug 25, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	5 hr
Aug 25, 4:50 PM EDT	Special Weather Statement	BOX	25 min
Aug 25, 6:11 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 1:36 PM EDT	Mesoscale Discussion	SPC	114 min
Aug 29, 6:45 PM EDT	Mesoscale Discussion	SPC	2 hr
Aug 29, 7:13 PM EDT	Severe Thunderstorm Watch	SPC	3 hr
Aug 29, 8:14 PM EDT	Severe Thunderstorm Warning	BOX	61 min
Aug 29, 8:52 PM EDT	Severe Thunderstorm Warning	BOX	53 min
Sep 3, 1:29 AM EDT	Special Weather Statement	BOX	61 min
Sep 18, 3:14 AM EDT	Frost Advisory	BOX	28 hr
Sep 19, 3:12 PM EDT	Freeze Warning	BOX	17 hr
Sep 20, 3:57 PM EDT	Frost Advisory	BOX	16 hr
Sep 21, 3:47 PM EDT	Frost Advisory	BOX	16 hr
Sep 21, 3:48 PM EDT	Fire Weather Watch	BOX	11 hr
Sep 22, 3:10 AM EDT	Red Flag Warning	BOX	16 hr
Sep 29, 4:01 AM EDT	Wind Advisory	BOX	33 hr
Sep 30, 5:09 AM EDT	Mesoscale Discussion	SPC	96 min
Oct 6, 3:22 PM EDT	High Wind Watch	BOX	12 hr
Oct 6, 3:22 PM EDT	High Wind Warning	BOX	30 hr
Oct 7, 4:38 PM EDT	Severe Thunderstorm Warning	BOX	67 min
Oct 7, 4:50 PM EDT	Severe Thunderstorm Warning	BOX	55 min
Oct 7, 5:22 PM EDT	Severe Thunderstorm Warning	BOX	38 min
Oct 7, 5:38 PM EDT	Severe Thunderstorm Warning	BOX	40 min
Oct 17, 3:37 AM EDT	Frost Advisory	BOX	29 hr
Oct 20, 11:17 PM EDT	Dense Fog Advisory	BOX	13 hr
Oct 29, 3:18 PM EDT	Winter Weather Advisory	BOX	23 hr
Nov 1, 3:07 PM EST	Wind Advisory	BOX	43 hr
Nov 1, 6:48 PM EST	Special Weather Statement	BOX	57 min
Nov 15, 7:32 PM EST	Severe Thunderstorm Watch	SPC	5 hr
Nov 15, 8:52 PM EST	Severe Thunderstorm Warning	BOX	53 min
Nov 15, 9:09 PM EST	Special Weather Statement	BOX	51 min
Nov 15, 9:29 PM EST	Severe Thunderstorm Warning	BOX	34 min
Nov 15, 9:37 PM EST	Mesoscale Discussion	SPC	113 min
Nov 15, 9:45 PM EST	Severe Thunderstorm Warning	BOX	45 min
Nov 29, 3:43 PM EST	Wind Advisory	BOX	31 hr
Nov 30, 7:13 PM EST	Mesoscale Discussion	SPC	2 hr
Dec 3, 3:52 PM EST	Winter Storm Watch	BOX	35 hr
Dec 4, 3:02 PM EST	Winter Storm Warning	BOX	29 hr
Dec 5, 2:48 AM EST	Winter Weather Advisory	BOX	17 hr
Dec 5, 7:52 AM EST	Mesoscale Discussion	SPC	4 hr
Dec 12, 6:46 PM EST	Dense Fog Advisory	BOX	15 hr
Dec 14, 3:45 PM EST	Winter Storm Watch	BOX	36 hr
Dec 15, 3:14 PM EST	Winter Storm Warning	BOX	46 hr
Dec 16, 6:48 PM EST	Mesoscale Discussion	SPC	5 hr
Dec 16, 10:12 PM EST	Mesoscale Discussion	SPC	6 hr
Dec 21, 12:21 AM EST	Dense Fog Advisory	BOX	7 hr
Dec 23, 2:05 PM EST	Flood Watch	BOX	51 hr
Dec 23, 2:30 PM EST	Wind Advisory	BOX	44 hr
Dec 25, 12:41 PM EST	River Flood Warning	BOX	24 hr
Dec 25, 12:41 PM EST	River Flood Warning	BOX	47 hr
Dec 25, 12:58 PM EST	Areal Flood Warning	BOX	4 hr
Dec 30, 3:20 AM EST	Winter Weather Advisory	BOX	25 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	39
Tornado Warning	2
Severe Thunderstorm Watch	7
Tornado Watch	3
Mesoscale Discussion	38
Special Weather Statement	40
Flooding
Areal Flood Warning	2
Flash Flood Warning	2
River Flood Warning	2
Flash Flood Watch	2
Flood Watch	1
Winter
Winter Storm Warning	5
Winter Storm Watch	4
Winter Weather Advisory	9
Heat
Excessive Heat Watch	1
Heat Advisory	3
Cold
Freeze Warning	4
Freeze Watch	1
Frost Advisory	4
Wind and dust
High Wind Warning	2
High Wind Watch	2
Wind Advisory	13
Fire
Red Flag Warning	1
Fire Weather Watch	1
Fog and smoke
Dense Fog Advisory	4
Tropical
Tropical Storm Warning	1
Tropical Storm Watch	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 2019 2021

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.