Alert archive / New Hampshire / Coos County

Weather alerts in Coos County, New Hampshire, 2021

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

Coos County and its neighbors

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

Alerts
92
Warnings
18
Watches
12
Advisories
29
Busiest month
June20 alerts
Busiest day
September 15, 20218 alerts

Over time

By month

Warning verification

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

Coos County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings10910%5100%22 min
Flash flood warnings010%

Each office's whole area, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Gray, ME: tornado warnings40100%0
NWS Gray, ME: severe thunderstorm warnings997128%20888%19 min
NWS Gray, ME: flash flood warnings201050%3795%124 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 1, 3:13 AM ESTWinter Storm WarningGYX36 hr
Jan 2, 8:04 AM ESTMesoscale DiscussionSPC4 hr
Jan 15, 6:49 AM ESTWinter Weather AdvisoryGYX36 hr
Jan 15, 4:20 PM ESTWinter Storm WarningGYX35 hr
Jan 16, 4:33 AM ESTMesoscale DiscussionSPC4 hr
Jan 17, 3:08 AM ESTWinter Weather AdvisoryGYX13 hr
Jan 20, 12:05 PM ESTSpecial Weather StatementGYX40 min
Jan 23, 3:41 AM ESTWind Chill AdvisoryGYX29 hr
Jan 28, 3:23 AM ESTWind Chill AdvisoryGYX30 hr
Jan 30, 3:25 PM ESTWinter Storm WatchGYX37 hr
Jan 31, 3:25 PM ESTWinter Storm WarningGYX59 hr
Feb 11, 3:57 AM ESTWind Chill AdvisoryGYX28 hr
Feb 14, 2:30 AM ESTWinter Storm WatchGYX27 hr
Feb 15, 3:59 AM ESTWinter Storm WarningGYX33 hr
Feb 25, 10:24 AM ESTSpecial Weather StatementGYX111 min
Feb 26, 3:19 PM ESTWinter Weather AdvisoryGYX28 hr
Feb 28, 3:04 PM ESTWind Chill WatchGYX12 hr
Mar 1, 2:39 AM ESTWind Chill WarningGYX32 hr
Mar 1, 3:23 AM ESTWind AdvisoryGYX37 hr
Mar 2, 10:53 AM ESTWinter Weather AdvisoryGYX5 min
Mar 2, 10:58 AM ESTWind Chill AdvisoryGYX5 hr
Mar 12, 9:19 PM ESTSpecial Weather StatementGYX56 min
Mar 13, 12:57 AM ESTSpecial Weather StatementGYX63 min
Mar 14, 3:24 AM EDTWind Chill AdvisoryGYX33 hr
Mar 28, 3:28 AM EDTWind AdvisoryGYX38 hr
Mar 28, 3:39 AM EDTFlood WatchGYX23 hr
Apr 14, 3:18 PM EDTWinter Storm WatchGYX12 hr
Apr 15, 3:14 AM EDTWinter Storm WarningGYX38 hr
Apr 15, 3:14 AM EDTWinter Weather AdvisoryGYX38 hr
Apr 21, 2:56 AM EDTWinter Weather AdvisoryGYX35 hr
May 16, 3:50 PM EDTSpecial Weather StatementGYX25 min
May 23, 2:28 PM EDTFrost AdvisoryGYX17 hr
May 26, 3:21 PM EDTMesoscale DiscussionSPC54 min
May 26, 3:56 PM EDTSevere Thunderstorm WatchSPC5 hr
May 26, 4:51 PM EDTSevere Thunderstorm WarningGYX54 min
May 27, 3:07 AM EDTFreeze WarningGYX28 hr
Jun 5, 2:33 PM EDTMesoscale DiscussionSPC117 min
Jun 15, 2:38 PM EDTMesoscale DiscussionSPC2 hr
Jun 15, 6:21 PM EDTSpecial Weather StatementGYX39 min
Jun 15, 7:06 PM EDTAreal Flood AdvisoryGYX3 hr
Jun 15, 8:01 PM EDTAreal Flood AdvisoryGYX119 min
Jun 19, 12:38 PM EDTMesoscale DiscussionSPC97 min
Jun 19, 2:40 PM EDTSpecial Weather StatementGYX35 min
Jun 19, 3:12 PM EDTSpecial Weather StatementGYX33 min
Jun 21, 1:11 PM EDTSevere Thunderstorm WatchSPC10 hr
Jun 21, 5:47 PM EDTSevere Thunderstorm WarningGYX43 min
Jun 21, 6:25 PM EDTSpecial Weather StatementGYX35 min
Jun 21, 6:38 PM EDTSevere Thunderstorm WarningGYX52 min
Jun 21, 7:36 PM EDTSpecial Weather StatementGYX24 min
Jun 28, 4:40 PM EDTMesoscale DiscussionSPC3 hr
Jun 28, 5:41 PM EDTSpecial Weather StatementGYX34 min
Jun 28, 6:36 PM EDTSpecial Weather StatementGYX24 min
Jun 30, 11:04 AM EDTMesoscale DiscussionSPC116 min
Jun 30, 12:06 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 30, 1:52 PM EDTMesoscale DiscussionSPC83 min
Jun 30, 3:10 PM EDTSevere Thunderstorm WarningGYX17 min
Jul 9, 3:15 PM EDTAreal Flood AdvisoryGYX3 hr
Jul 14, 3:11 PM EDTMesoscale DiscussionSPC3 hr
Jul 23, 12:31 PM EDTSpecial Weather StatementGYX29 min
Jul 23, 3:35 PM EDTSpecial Weather StatementGYX25 min
Jul 23, 5:18 PM EDTSevere Thunderstorm WarningGYX42 min
Jul 23, 5:59 PM EDTSpecial Weather StatementGYX31 min
Aug 1, 3:51 AM EDTFlash Flood WatchGYX24 hr
Aug 8, 5:10 PM EDTAreal Flood AdvisoryGYX71 min
Aug 10, 2:41 PM EDTHeat AdvisoryGYX53 hr
Aug 14, 5:44 AM EDTSpecial Weather StatementGYX31 min
Aug 14, 6:06 AM EDTSpecial Weather StatementGYX39 min
Sep 6, 1:40 PM EDTMesoscale DiscussionSPC2 hr
Sep 6, 2:32 PM EDTSpecial Weather StatementGYX28 min
Sep 6, 6:21 PM EDTSpecial Weather StatementGYX39 min
Sep 15, 7:50 AM EDTSpecial Weather StatementGYX55 min
Sep 15, 11:59 AM EDTMesoscale DiscussionSPC2 hr
Sep 15, 1:15 PM EDTSevere Thunderstorm WatchSPC6 hr
Sep 15, 2:18 PM EDTSevere Thunderstorm WarningGYX57 min
Sep 15, 2:31 PM EDTSevere Thunderstorm WarningGYX59 min
Sep 15, 2:33 PM EDTSevere Thunderstorm WarningGYX42 min
Sep 15, 3:22 PM EDTSevere Thunderstorm WarningGYX53 min
Sep 15, 4:09 PM EDTSevere Thunderstorm WarningGYX51 min
Sep 24, 2:14 PM EDTAreal Flood AdvisoryGYX3 hr
Nov 11, 2:52 PM ESTWind AdvisoryGYX29 hr
Nov 12, 2:28 PM ESTAreal Flood AdvisoryGYX3 hr
Nov 17, 3:21 AM ESTWinter Weather AdvisoryGYX24 hr
Nov 19, 11:00 AM ESTSpecial Weather StatementGYX45 min
Nov 25, 2:39 AM ESTWinter Storm WatchGYX12 hr
Nov 25, 2:55 PM ESTWinter Weather AdvisoryGYX45 hr
Dec 3, 9:42 AM ESTWind AdvisoryGYX5 hr
Dec 10, 4:32 PM ESTWinter Weather AdvisoryGYX26 hr
Dec 15, 2:55 AM ESTWinter Weather AdvisoryGYX33 hr
Dec 16, 3:14 PM ESTWind AdvisoryGYX21 hr
Dec 17, 2:47 AM ESTWinter Storm WatchGYX13 hr
Dec 17, 3:34 PM ESTWinter Storm WarningGYX42 hr
Dec 27, 3:11 PM ESTWinter Weather AdvisoryGYX19 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.