Alert archive / Maryland / Charles County

Weather alerts in Charles County, Maryland, 2017

109 weather alerts in 2017, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Charles County and its neighbors

Each county as a circle sized by its count in 2017. Tap one for its archive.

Alerts
109
Warnings
38
Watches
15
Advisories
36
Busiest month
August24 alerts
Busiest day
August 18, 201710 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 Charles County in 2017 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 3 minutes after it went out.

Charles County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings2150%1100%3 min
Severe thunderstorm warnings292417%2396%19 min
Flash flood warnings4325%333%57 min

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Baltimore/Washington: tornado warnings11464%1833%7 min
NWS Baltimore/Washington: severe thunderstorm warnings26119426%97681%19 min
NWS Baltimore/Washington: flash flood warnings493431%13081%78 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 6, 8:48 AM ESTWinter Weather AdvisoryLWX30 hr
Jan 22, 1:51 PM ESTWind AdvisoryLWX26 hr
Jan 23, 1:42 AM ESTCoastal Flood AdvisoryLWX35 hr
Jan 29, 3:42 AM ESTWinter Weather AdvisoryLWX33 hr
Feb 9, 8:57 AM ESTWind AdvisoryLWX9 hr
Feb 11, 2:22 PM ESTHigh Wind WatchLWX13 hr
Feb 12, 3:36 AM ESTWind AdvisoryLWX37 hr
Feb 25, 12:24 PM ESTMesoscale DiscussionSPC2 hr
Feb 25, 1:30 PM ESTSevere Thunderstorm WatchSPC6 hr
Feb 25, 2:27 PM ESTSevere Thunderstorm WarningLWX48 min
Feb 25, 2:35 PM ESTSevere Thunderstorm WarningLWX40 min
Feb 25, 2:52 PM ESTSevere Thunderstorm WarningLWX38 min
Feb 25, 3:03 PM ESTTornado WarningLWX27 min
Feb 25, 3:39 PM ESTSevere Thunderstorm WarningLWX26 min
Mar 1, 9:44 AM ESTMesoscale DiscussionSPC91 min
Mar 1, 10:38 AM ESTSevere Thunderstorm WatchSPC4 hr
Mar 1, 1:05 PM ESTSevere Thunderstorm WarningLWX40 min
Mar 1, 1:36 PM ESTSevere Thunderstorm WarningLWX54 min
Mar 1, 1:40 PM ESTSevere Thunderstorm WarningLWX50 min
Mar 1, 2:47 PM ESTWind AdvisoryLWX18 hr
Mar 13, 4:00 AM EDTWinter Weather AdvisoryLWX34 hr
Mar 15, 3:52 AM EDTWind AdvisoryLWX16 hr
Mar 27, 4:37 AM EDTDense Fog AdvisoryLWX5 hr
Apr 6, 5:59 AM EDTMesoscale DiscussionSPC91 min
Apr 6, 11:41 AM EDTSevere Thunderstorm WarningLWX38 min
Apr 6, 12:18 PM EDTMesoscale DiscussionSPC57 min
Apr 6, 12:45 PM EDTSevere Thunderstorm WatchSPC4 hr
Apr 6, 4:18 PM EDTSevere Thunderstorm WarningLWX27 min
Apr 8, 2:10 PM EDTFrost AdvisoryLWX18 hr
Apr 21, 4:19 PM EDTMesoscale DiscussionSPC56 min
Apr 22, 12:06 AM EDTSevere Thunderstorm WarningLWX39 min
Apr 24, 11:38 AM EDTCoastal Flood AdvisoryLWX47 hr
Apr 30, 3:25 PM EDTMesoscale DiscussionSPC95 min
May 1, 5:54 PM EDTSevere Thunderstorm WatchSPC5 hr
May 1, 8:28 PM EDTMesoscale DiscussionSPC92 min
May 4, 3:42 PM EDTCoastal Flood AdvisoryLWX58 hr
May 5, 7:49 AM EDTSevere Thunderstorm WarningLWX56 min
May 5, 8:29 AM EDTSevere Thunderstorm WarningLWX61 min
May 5, 8:35 AM EDTSevere Thunderstorm WarningLWX21 min
May 12, 2:43 PM EDTCoastal Flood AdvisoryLWX21 hr
May 18, 8:23 PM EDTSevere Thunderstorm WarningLWX34 min
May 19, 3:36 PM EDTMesoscale DiscussionSPC114 min
May 24, 2:43 PM EDTCoastal Flood AdvisoryLWX46 hr
May 25, 12:59 PM EDTMesoscale DiscussionSPC61 min
May 25, 4:26 PM EDTSevere Thunderstorm WarningLWX49 min
May 25, 4:55 PM EDTSevere Thunderstorm WarningLWX50 min
May 25, 5:04 PM EDTSevere Thunderstorm WarningLWX41 min
May 25, 5:28 PM EDTSevere Thunderstorm WarningLWX17 min
May 27, 3:38 PM EDTCoastal Flood AdvisoryLWX5 days
Jun 7, 2:42 PM EDTCoastal Flood AdvisoryLWX39 hr
Jun 19, 12:14 PM EDTMesoscale DiscussionSPC2 hr
Jun 19, 12:48 PM EDTSevere Thunderstorm WatchSPC8 hr
Jun 19, 2:21 PM EDTMesoscale DiscussionSPC114 min
Jun 19, 4:49 PM EDTSevere Thunderstorm WarningLWX41 min
Jul 1, 1:34 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 6, 6:20 AM EDTFlash Flood WatchLWX20 hr
Jul 6, 8:03 AM EDTFlash Flood WarningLWX6 hr
Jul 7, 7:40 PM EDTSevere Thunderstorm WarningLWX35 min
Jul 12, 3:05 PM EDTHeat AdvisoryLWX28 hr
Jul 13, 3:03 PM EDTMesoscale DiscussionSPC57 min
Jul 14, 12:12 PM EDTHeat AdvisoryLWX6 hr
Jul 14, 1:09 PM EDTMesoscale DiscussionSPC2 hr
Jul 14, 1:40 PM EDTSevere Thunderstorm WatchSPC7 hr
Jul 14, 4:23 PM EDTMesoscale DiscussionSPC67 min
Jul 20, 3:21 AM EDTHeat AdvisoryLWX16 hr
Jul 20, 8:30 PM EDTHeat AdvisoryLWX23 hr
Jul 22, 3:09 AM EDTHeat AdvisoryLWX16 hr
Jul 22, 1:12 PM EDTMesoscale DiscussionSPC3 hr
Jul 22, 6:06 PM EDTSevere Thunderstorm WarningLWX54 min
Jul 24, 6:09 PM EDTMesoscale DiscussionSPC3 hr
Jul 27, 1:47 PM EDTFlash Flood WatchLWX48 hr
Aug 6, 5:29 PM EDTFlash Flood WatchLWX23 hr
Aug 11, 7:40 PM EDTSevere Thunderstorm WarningLWX65 min
Aug 11, 10:48 PM EDTFlash Flood WarningLWX3 hr
Aug 12, 4:11 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 12, 8:25 PM EDTMesoscale DiscussionSPC95 min
Aug 15, 10:31 PM EDTDense Fog AdvisoryLWX11 hr
Aug 18, 3:42 AM EDTHeat AdvisoryLWX15 hr
Aug 18, 12:35 PM EDTFlash Flood WatchLWX8 hr
Aug 18, 1:54 PM EDTMesoscale DiscussionSPC2 hr
Aug 18, 2:27 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 18, 4:34 PM EDTMesoscale DiscussionSPC86 min
Aug 18, 5:29 PM EDTSevere Thunderstorm WarningLWX46 min
Aug 18, 5:59 PM EDTSevere Thunderstorm WarningLWX46 min
Aug 18, 6:42 PM EDTSevere Thunderstorm WarningLWX63 min
Aug 18, 7:36 PM EDTFlash Flood WarningLWX4 hr
Aug 18, 7:51 PM EDTSevere Thunderstorm WarningLWX84 min
Aug 19, 10:51 PM EDTSevere Thunderstorm WarningLWX39 min
Aug 21, 2:53 PM EDTMesoscale DiscussionSPC2 hr
Aug 21, 3:44 PM EDTSevere Thunderstorm WarningLWX46 min
Aug 21, 4:51 PM EDTSevere Thunderstorm WarningLWX39 min
Aug 21, 5:00 PM EDTTornado WarningLWX30 min
Aug 21, 5:24 PM EDTFlash Flood WarningLWX3 hr
Aug 21, 8:16 PM EDTAreal Flood WarningLWX6 hr
Aug 28, 7:05 AM EDTCoastal Flood AdvisoryLWX4 days
Sep 2, 3:00 AM EDTCoastal Flood AdvisoryLWX28 hr
Sep 16, 2:22 PM EDTCoastal Flood AdvisoryLWX8 days
Oct 12, 5:53 AM EDTCoastal Flood AdvisoryLWX47 hr
Oct 17, 1:39 PM EDTFrost AdvisoryLWX19 hr
Oct 23, 2:00 PM EDTCoastal Flood AdvisoryLWX32 hr
Oct 26, 3:53 AM EDTFrost AdvisoryLWX29 hr
Oct 29, 3:44 AM EDTWind AdvisoryLWX30 hr
Nov 8, 1:04 PM ESTCoastal Flood AdvisoryLWX39 hr
Nov 9, 2:17 AM ESTFreeze WatchLWX24 hr
Nov 10, 2:41 AM ESTFreeze WarningLWX31 hr
Nov 18, 3:40 AM ESTWind AdvisoryLWX33 hr
Dec 8, 5:50 AM ESTWinter Weather AdvisoryLWX51 hr
Dec 8, 2:52 PM ESTWinter Storm WarningLWX25 hr
Dec 24, 10:35 AM ESTWind AdvisoryLWX26 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 archive20162018

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.