Alert archive / Connecticut / Capitol Planning Region

Weather alerts in Capitol Planning Region, Connecticut, 2021

111 weather alerts in 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Capitol Planning Region and its neighbors

Each county as a circle sized by its count in 2021. Tap one for its archive.

Alerts
111
Warnings
59
Watches
24
Advisories
28
Busiest month
July28 alerts
Busiest day
July 7, 20215 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 1 tornado warnings covering Capitol Planning Region in 2021 had a tornado report inside them.

Capitol Planning Region, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%0
Severe thunderstorm warnings261638%0
Flash flood warnings100100%0

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Boston/Norton, MA: tornado warnings23674%1450%18 min
NWS Boston/Norton, MA: severe thunderstorm warnings1318436%35880%27 min
NWS Boston/Norton, MA: flash flood warnings38197%560%141 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.

IssuedProductOfficeLasted
Jan 2, 3:56 PM ESTWinter Weather AdvisoryBOX35 hr
Jan 25, 3:02 PM ESTWinter Weather AdvisoryBOX37 hr
Jan 28, 3:32 AM ESTWind Chill AdvisoryBOX32 hr
Jan 30, 3:28 PM ESTWinter Storm WatchBOX24 hr
Jan 31, 3:37 PM ESTWinter Storm WarningBOX37 hr
Feb 2, 4:07 AM ESTWinter Weather AdvisoryBOX11 hr
Feb 5, 3:27 PM ESTWinter Storm WatchBOX24 hr
Feb 6, 3:27 PM ESTWinter Weather AdvisoryBOX30 hr
Feb 8, 2:56 PM ESTWinter Weather AdvisoryBOX28 hr
Feb 14, 3:31 PM ESTWinter Storm WatchBOX12 hr
Feb 15, 3:54 AM ESTWinter Weather AdvisoryBOX31 hr
Feb 16, 3:38 PM ESTWinter Storm WatchBOX24 hr
Feb 17, 3:37 PM ESTWinter Weather AdvisoryBOX56 hr
Feb 28, 3:01 PM ESTWind AdvisoryBOX48 hr
Mar 12, 2:53 AM ESTWind AdvisoryBOX28 hr
Mar 12, 1:30 PM ESTRed Flag WarningBOX28 hr
Mar 13, 3:42 PM ESTWind AdvisoryBOX35 hr
Mar 14, 3:10 AM EDTRed Flag WarningBOX17 hr
Mar 15, 10:48 AM EDTRed Flag WarningBOX10 hr
Mar 25, 3:57 PM EDTWind AdvisoryBOX36 hr
Mar 28, 3:34 AM EDTWind AdvisoryBOX36 hr
Apr 11, 2:39 AM EDTDense Fog AdvisoryBOX7 hr
Apr 21, 12:28 PM EDTSevere Thunderstorm WatchSPC5 hr
Apr 21, 3:17 PM EDTSevere Thunderstorm WarningBOX58 min
Apr 21, 4:13 PM EDTFreeze WarningBOX14 hr
Apr 22, 4:08 PM EDTFreeze WarningBOX12 hr
Apr 29, 3:24 PM EDTWind AdvisoryBOX35 hr
May 26, 3:56 PM EDTSevere Thunderstorm WatchSPC5 hr
May 26, 7:05 PM EDTSevere Thunderstorm WarningBOX55 min
May 26, 7:40 PM EDTSevere Thunderstorm WarningBOX65 min
May 26, 7:45 PM EDTSevere Thunderstorm WarningBOX60 min
Jun 4, 5:53 PM EDTSevere Thunderstorm WarningBOX37 min
Jun 6, 3:29 AM EDTHeat AdvisoryBOX64 hr
Jun 8, 12:54 PM EDTFlash Flood WatchBOX8 hr
Jun 8, 2:29 PM EDTSevere Thunderstorm WarningBOX61 min
Jun 8, 2:56 PM EDTSevere Thunderstorm WarningBOX43 min
Jun 9, 3:12 AM EDTHeat AdvisoryBOX17 hr
Jun 9, 3:23 PM EDTSevere Thunderstorm WarningBOX67 min
Jun 26, 3:15 PM EDTHeat AdvisoryBOX4 days
Jun 29, 6:48 PM EDTSevere Thunderstorm WarningBOX57 min
Jun 29, 6:59 PM EDTSevere Thunderstorm WarningBOX44 min
Jun 29, 7:34 PM EDTSevere Thunderstorm WarningBOX56 min
Jun 30, 3:21 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 30, 6:45 PM EDTSevere Thunderstorm WarningBOX60 min
Jul 6, 3:33 AM EDTHeat AdvisoryBOX39 hr
Jul 6, 1:13 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 6, 4:20 PM EDTSevere Thunderstorm WarningBOX55 min
Jul 6, 5:00 PM EDTSevere Thunderstorm WarningBOX60 min
Jul 7, 2:41 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 7, 4:00 PM EDTSevere Thunderstorm WarningBOX60 min
Jul 7, 4:50 PM EDTSevere Thunderstorm WarningBOX55 min
Jul 7, 5:30 PM EDTSevere Thunderstorm WarningBOX60 min
Jul 7, 6:38 PM EDTSevere Thunderstorm WarningBOX43 min
Jul 8, 4:20 AM EDTFlash Flood WatchBOX36 hr
Jul 8, 2:09 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 9, 8:19 AM EDTFlash Flood WarningBOX6 hr
Jul 9, 2:24 PM EDTAreal Flood WarningBOX8 hr
Jul 9, 9:40 PM EDTAreal Flood WarningBOX33 hr
Jul 9, 10:57 PM EDTAreal Flood WarningBOX3 hr
Jul 11, 3:34 PM EDTFlash Flood WatchBOX21 hr
Jul 16, 2:59 PM EDTFlash Flood WatchBOX56 hr
Jul 16, 5:31 PM EDTSevere Thunderstorm WarningBOX42 min
Jul 17, 1:13 PM EDTSevere Thunderstorm WatchSPC10 hr
Jul 17, 4:38 PM EDTSevere Thunderstorm WarningBOX67 min
Jul 17, 4:58 PM EDTFlash Flood WarningBOX2 hr
Jul 17, 5:21 PM EDTFlash Flood WarningBOX5 hr
Jul 18, 1:39 AM EDTAreal Flood WarningBOX2 hr
Jul 18, 2:48 AM EDTAreal Flood WarningBOX105 min
Jul 18, 9:33 AM EDTAreal Flood WarningBOX5 hr
Jul 21, 11:56 AM EDTSevere Thunderstorm WatchSPC7 hr
Jul 27, 2:47 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 27, 5:34 PM EDTSevere Thunderstorm WarningBOX56 min
Aug 10, 3:22 AM EDTExcessive Heat WatchBOX60 hr
Aug 10, 3:22 AM EDTHeat AdvisoryBOX41 hr
Aug 11, 3:28 PM EDTExcessive Heat WarningBOX29 hr
Aug 12, 2:53 PM EDTHeat AdvisoryBOX29 hr
Aug 12, 5:35 PM EDTSevere Thunderstorm WarningBOX55 min
Aug 12, 6:26 PM EDTSevere Thunderstorm WarningBOX49 min
Aug 19, 7:32 AM EDTAreal Flood WarningBOX5 hr
Aug 19, 8:14 AM EDTFlash Flood WarningBOX3 hr
Aug 20, 11:09 PM EDTTropical Storm WarningBOX42 hr
Aug 21, 4:16 AM EDTFlood WatchBOX64 hr
Aug 22, 1:28 PM EDTFlash Flood WarningBOX4 hr
Aug 22, 1:37 PM EDTFlash Flood WarningBOX4 hr
Aug 22, 1:53 PM EDTFlash Flood WarningBOX4 hr
Aug 22, 4:11 PM EDTAreal Flood WarningBOX4 hr
Aug 22, 8:45 PM EDTAreal Flood WarningBOX9 hr
Aug 23, 11:52 AM EDTFlash Flood WarningBOX3 hr
Aug 23, 3:36 PM EDTAreal Flood WarningBOX6 hr
Aug 25, 2:55 PM EDTHeat AdvisoryBOX29 hr
Aug 26, 3:44 PM EDTHeat AdvisoryBOX27 hr
Aug 27, 4:59 PM EDTSevere Thunderstorm WarningBOX38 min
Aug 30, 3:12 PM EDTFlash Flood WatchBOX65 hr
Sep 1, 7:57 PM EDTFlash Flood WarningBOX12 hr
Sep 2, 1:51 AM EDTRiver Flood WarningBOX26 hr
Sep 2, 1:51 AM EDTRiver Flood WarningBOX66 hr
Sep 2, 1:51 AM EDTRiver Flood WarningBOX45 hr
Sep 2, 7:25 AM EDTFlash Flood Warning Considerable damage threatBOX6 hr
Sep 2, 1:28 PM EDTAreal Flood WarningBOX6 hr
Sep 9, 3:50 AM EDTTornado WarningBOX25 min
Sep 15, 3:43 PM EDTSevere Thunderstorm WatchSPC6 hr
Sep 23, 2:48 PM EDTFlash Flood WatchBOX19 hr
Oct 25, 3:47 AM EDTFlood WatchBOX52 hr
Nov 13, 12:27 PM ESTSevere Thunderstorm WatchSPC6 hr
Nov 13, 4:09 PM ESTSevere Thunderstorm WarningBOX15 min
Dec 10, 3:45 PM ESTWind AdvisoryBOX36 hr
Dec 11, 10:21 PM ESTSevere Thunderstorm WarningBOX39 min
Dec 21, 3:26 AM ESTWinter Weather AdvisoryBOX32 hr
Dec 24, 3:39 AM ESTWinter Weather AdvisoryBOX49 hr
Dec 27, 3:14 AM ESTWinter Weather AdvisoryBOX30 hr
Dec 30, 9:25 PM ESTDense Fog AdvisoryBOX13 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 archive20202022

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.