Alert archive / New Hampshire / Strafford County

Weather alerts in Strafford County, New Hampshire, 2021

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

Strafford County and its neighbors

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

Alerts
101
Warnings
21
Watches
10
Advisories
38
Busiest month
July24 alerts
Busiest day
May 26, 20217 alerts

Over time

By month

Warning verification

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

Strafford County, 2021

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings15147%475%21 min
Flash flood warnings3167%1100%117 min

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 20, 5:23 PM ESTSpecial Weather StatementGYX67 min
Jan 24, 6:50 AM ESTWind AdvisoryGYX8 hr
Jan 30, 3:25 PM ESTWinter Storm WatchGYX37 hr
Jan 31, 3:25 PM ESTWinter Storm WarningGYX59 hr
Feb 1, 7:27 PM ESTMesoscale DiscussionSPC6 hr
Feb 2, 8:41 AM ESTWinter Weather AdvisoryGYX10 hr
Feb 5, 10:48 AM ESTSpecial Weather StatementGYX57 min
Feb 5, 11:45 AM ESTSpecial Weather StatementGYX60 min
Feb 6, 3:18 PM ESTWinter Weather AdvisoryGYX33 hr
Feb 8, 3:22 PM ESTWinter Weather AdvisoryGYX27 hr
Feb 15, 3:59 AM ESTWinter Weather AdvisoryGYX33 hr
Feb 16, 2:51 AM ESTMesoscale DiscussionSPC4 hr
Feb 22, 10:40 AM ESTWinter Weather AdvisoryGYX12 hr
Mar 1, 3:23 AM ESTWind AdvisoryGYX37 hr
Mar 1, 10:18 PM ESTSpecial Weather StatementGYX57 min
Mar 12, 3:18 AM ESTWind AdvisoryGYX31 hr
Mar 26, 4:52 PM EDTSevere Thunderstorm WarningGYX38 min
Mar 28, 3:28 AM EDTWind AdvisoryGYX38 hr
Apr 15, 3:14 AM EDTWinter Weather AdvisoryGYX38 hr
Apr 21, 6:11 PM EDTSpecial Weather StatementGYX49 min
May 26, 3:21 PM EDTMesoscale DiscussionSPC54 min
May 26, 3:56 PM EDTSevere Thunderstorm WatchSPC5 hr
May 26, 5:52 PM EDTSevere Thunderstorm WarningGYX53 min
May 26, 5:58 PM EDTSevere Thunderstorm WarningGYX62 min
May 26, 6:07 PM EDTMesoscale DiscussionSPC113 min
May 26, 6:30 PM EDTSevere Thunderstorm WarningGYX60 min
May 26, 6:59 PM EDTSevere Thunderstorm WarningGYX61 min
Jun 6, 3:11 AM EDTHeat AdvisoryGYX63 hr
Jun 8, 4:52 PM EDTSpecial Weather StatementGYX38 min
Jun 8, 6:24 PM EDTAreal Flood AdvisoryGYX115 min
Jun 15, 2:38 PM EDTMesoscale DiscussionSPC2 hr
Jun 15, 3:53 PM EDTSevere Thunderstorm WarningGYX40 min
Jun 15, 5:05 PM EDTSpecial Weather StatementGYX40 min
Jun 26, 3:25 PM EDTHeat AdvisoryGYX28 hr
Jun 27, 3:37 PM EDTHeat AdvisoryGYX28 hr
Jun 28, 4:13 PM EDTHeat AdvisoryGYX28 hr
Jun 29, 2:30 PM EDTHeat AdvisoryGYX28 hr
Jun 30, 11:04 AM EDTMesoscale DiscussionSPC116 min
Jun 30, 12:06 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 30, 4:01 PM EDTSevere Thunderstorm WarningGYX27 min
Jun 30, 4:11 PM EDTSevere Thunderstorm WarningGYX49 min
Jun 30, 4:16 PM EDTMesoscale DiscussionSPC89 min
Jul 4, 12:11 AM EDTAreal Flood AdvisoryGYX3 hr
Jul 8, 4:09 AM EDTFlash Flood WatchGYX39 hr
Jul 9, 1:01 PM EDTFlash Flood WarningGYX4 hr
Jul 9, 1:10 PM EDTFlash Flood WarningGYX4 hr
Jul 9, 3:15 PM EDTAreal Flood AdvisoryGYX3 hr
Jul 11, 3:15 PM EDTFlash Flood WatchGYX22 hr
Jul 14, 8:05 AM EDTDense Fog AdvisoryGYX3 hr
Jul 14, 3:11 PM EDTMesoscale DiscussionSPC3 hr
Jul 16, 3:19 AM EDTHeat AdvisoryGYX15 hr
Jul 18, 7:59 AM EDTAreal Flood AdvisoryGYX3 hr
Jul 20, 10:01 PM EDTMesoscale DiscussionSPC59 min
Jul 20, 10:38 PM EDTSevere Thunderstorm WarningGYX41 min
Jul 20, 11:32 PM EDTSpecial Weather StatementGYX43 min
Jul 21, 12:13 AM EDTSevere Thunderstorm WarningGYX30 min
Jul 23, 12:57 PM EDTSevere Thunderstorm WarningGYX33 min
Jul 23, 2:13 PM EDTSevere Thunderstorm WarningGYX27 min
Jul 23, 5:47 PM EDTMesoscale DiscussionSPC58 min
Jul 27, 5:38 PM EDTSpecial Weather StatementGYX37 min
Jul 27, 6:16 PM EDTSpecial Weather StatementGYX29 min
Jul 27, 6:36 PM EDTSevere Thunderstorm WarningGYX39 min
Jul 27, 6:54 PM EDTAreal Flood AdvisoryGYX111 min
Jul 29, 8:58 PM EDTAreal Flood AdvisoryGYX4 hr
Jul 29, 9:33 PM EDTFlash Flood WarningGYX5 hr
Jul 29, 9:57 PM EDTSpecial Weather StatementGYX48 min
Aug 9, 3:31 PM EDTDense Fog AdvisoryGYX15 hr
Aug 10, 3:15 AM EDTHeat AdvisoryGYX4 days
Aug 12, 3:50 PM EDTMesoscale DiscussionSPC55 min
Aug 12, 5:50 PM EDTSpecial Weather StatementGYX55 min
Aug 18, 3:02 PM EDTFlash Flood WatchGYX31 hr
Aug 23, 6:06 AM EDTDense Fog AdvisoryGYX3 hr
Aug 24, 4:22 AM EDTAreal Flood AdvisoryGYX3 hr
Aug 25, 3:13 PM EDTHeat AdvisoryGYX29 hr
Sep 1, 3:35 AM EDTFlash Flood WatchGYX29 hr
Sep 2, 3:49 AM EDTAreal Flood AdvisoryGYX5 hr
Sep 9, 4:12 AM EDTSpecial Weather StatementGYX48 min
Sep 15, 11:59 AM EDTMesoscale DiscussionSPC2 hr
Sep 15, 1:15 PM EDTSevere Thunderstorm WatchSPC6 hr
Sep 15, 4:38 PM EDTMesoscale DiscussionSPC67 min
Sep 15, 4:44 PM EDTSevere Thunderstorm WarningGYX46 min
Sep 15, 5:29 PM EDTSevere Thunderstorm WarningGYX61 min
Sep 17, 11:50 PM EDTDense Fog AdvisoryGYX9 hr
Oct 11, 2:29 PM EDTDense Fog AdvisoryGYX19 hr
Oct 26, 3:45 AM EDTWind AdvisoryGYX38 hr
Oct 29, 3:22 PM EDTFlash Flood WatchGYX39 hr
Oct 30, 10:12 PM EDTAreal Flood AdvisoryGYX6 hr
Oct 31, 4:02 AM EDTAreal Flood WarningGYX8 hr
Nov 12, 2:05 PM ESTSpecial Weather StatementGYX55 min
Dec 10, 4:32 PM ESTWinter Weather AdvisoryGYX26 hr
Dec 11, 9:49 PM ESTMesoscale DiscussionSPC116 min
Dec 11, 10:50 PM ESTSpecial Weather StatementGYX40 min
Dec 11, 11:36 PM ESTSpecial Weather StatementGYX54 min
Dec 16, 3:14 PM ESTDense Fog AdvisoryGYX12 hr
Dec 17, 2:47 AM ESTWinter Storm WatchGYX13 hr
Dec 17, 3:34 PM ESTWinter Storm WarningGYX42 hr
Dec 21, 3:29 AM ESTWinter Weather AdvisoryGYX36 hr
Dec 22, 4:26 AM ESTMesoscale DiscussionSPC4 hr
Dec 24, 3:26 AM ESTWinter Weather AdvisoryGYX51 hr
Dec 25, 5:44 AM ESTMesoscale DiscussionSPC5 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.