Alert archive / Maryland / Charles County
Weather alerts in Charles County, Maryland, 2018
158 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 158
- Warnings
- 49
- Watches
- 29
- Advisories
- 51
- Busiest month
- July25 alerts
- Busiest day
- May 14, 20187 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 3 tornado warnings covering Charles County in 2018 had a tornado report inside them.
Charles County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 3 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 25 | 13 | 48% | 19 | 63% | 27 min |
| Flash flood warnings | 1 | 1 | 0% | 1 | 100% | 144 min |
Each office's whole area, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 19 | 1 | 95% | 4 | 25% | 1 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 312 | 208 | 33% | 690 | 70% | 20 min |
| NWS Baltimore/Washington: flash flood warnings | 87 | 38 | 56% | 129 | 89% | 103 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 |
|---|---|---|---|
| Jan 3, 3:34 AM EST | Winter Weather Advisory | LWX | 35 hr |
| Jan 4, 3:36 AM EST | Wind Chill Advisory | LWX | 32 hr |
| Jan 4, 12:47 PM EST | Wind Advisory | LWX | 5 hr |
| Jan 5, 3:45 AM EST | Wind Chill Advisory | LWX | 54 hr |
| Jan 6, 3:55 AM EST | Wind Chill Advisory | LWX | 26 hr |
| Jan 15, 1:47 PM EST | Winter Weather Advisory | LWX | 46 hr |
| Feb 3, 3:00 PM EST | Winter Weather Advisory | LWX | 28 hr |
| Feb 6, 4:02 AM EST | Winter Weather Advisory | LWX | 38 hr |
| Feb 10, 3:38 AM EST | Flood Watch | LWX | 36 hr |
| Feb 11, 12:10 PM EST | Areal Flood Warning | LWX | 12 hr |
| Feb 23, 8:30 PM EST | Dense Fog Advisory | LWX | 15 hr |
| Feb 25, 5:46 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Feb 25, 10:46 PM EST | Dense Fog Advisory | LWX | 6 hr |
| Feb 28, 2:52 PM EST | High Wind Watch | LWX | 21 hr |
| Mar 1, 4:06 AM EST | High Wind Warning | LWX | 45 hr |
| Mar 2, 7:57 PM EST | Wind Advisory | LWX | 10 hr |
| Mar 5, 1:25 AM EST | Coastal Flood Advisory | LWX | 68 hr |
| Mar 19, 12:06 PM EDT | Winter Storm Watch | LWX | 25 hr |
| Mar 20, 12:47 PM EDT | Winter Storm Warning | LWX | 31 hr |
| Apr 3, 5:33 PM EDT | Wind Advisory | LWX | 25 hr |
| Apr 11, 1:34 PM EDT | Fire Weather Watch | LWX | 14 hr |
| Apr 12, 3:42 AM EDT | Red Flag Warning | LWX | 16 hr |
| Apr 16, 2:12 AM EDT | Severe Thunderstorm Warning | LWX | 17 min |
| Apr 16, 2:34 AM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Apr 16, 3:01 AM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Apr 29, 3:18 PM EDT | Fire Weather Watch | LWX | 12 hr |
| Apr 30, 3:32 AM EDT | Red Flag Warning | LWX | 16 hr |
| May 10, 12:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| May 10, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 10, 4:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 12, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 8:47 PM EDT | Severe Thunderstorm Warning | LWX | 88 min |
| May 13, 7:00 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 13, 10:12 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| May 14, 12:29 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| May 14, 3:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 14, 6:33 PM EDT | Severe Thunderstorm Warning | LWX | 57 min |
| May 14, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| May 14, 7:12 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| May 14, 7:22 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 15, 5:43 PM EDT | Mesoscale Discussion | SPC | 92 min |
| May 15, 8:41 PM EDT | Mesoscale Discussion | SPC | 94 min |
| May 16, 1:40 PM EDT | Flood Watch | LWX | 3 days |
| May 17, 3:50 PM EDT | Coastal Flood Advisory | LWX | 3 days |
| May 18, 3:04 AM EDT | Areal Flood Warning | LWX | 51 hr |
| May 22, 1:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| May 22, 2:33 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| May 22, 4:50 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 22, 5:08 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| May 27, 4:25 AM EDT | Flash Flood Watch | LWX | 16 hr |
| May 27, 1:29 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 2, 3:13 AM EDT | Flash Flood Watch | LWX | 25 hr |
| Jun 2, 2:44 PM EDT | Areal Flood Warning | LWX | 117 min |
| Jun 3, 4:11 AM EDT | Flood Watch | LWX | 14 hr |
| Jun 3, 6:03 PM EDT | Flood Watch | LWX | 3 hr |
| Jun 9, 1:34 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 9, 6:08 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jun 9, 6:34 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jun 10, 3:47 AM EDT | Flash Flood Watch | LWX | 24 hr |
| Jun 10, 3:23 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 11, 2:53 PM EDT | Coastal Flood Advisory | LWX | 37 hr |
| Jun 12, 2:29 PM EDT | Coastal Flood Advisory | LWX | 20 hr |
| Jun 18, 9:42 AM EDT | Heat Advisory | LWX | 10 hr |
| Jun 19, 12:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 22, 12:30 PM EDT | Coastal Flood Advisory | LWX | 26 hr |
| Jun 23, 5:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 24, 2:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 26, 9:41 PM EDT | Coastal Flood Advisory | LWX | 39 hr |
| Jun 27, 7:37 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jun 30, 2:14 PM EDT | Heat Advisory | LWX | 27 hr |
| Jul 1, 2:10 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 2, 1:40 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 8, 6:40 AM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Jul 21, 2:46 AM EDT | Coastal Flood Advisory | LWX | 4 days |
| Jul 21, 5:05 AM EDT | Flash Flood Watch | LWX | 21 hr |
| Jul 21, 5:35 PM EDT | Areal Flood Warning | LWX | 27 hr |
| Jul 21, 7:36 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jul 22, 12:12 AM EDT | Areal Flood Warning | LWX | 5 hr |
| Jul 22, 11:35 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jul 22, 12:12 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 22, 1:45 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Jul 22, 1:59 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jul 22, 5:01 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Jul 22, 6:06 PM EDT | Areal Flood Warning | LWX | 20 hr |
| Jul 23, 2:57 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 4:59 AM EDT | Flash Flood Watch | LWX | 68 hr |
| Jul 23, 2:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 24, 8:10 AM EDT | Areal Flood Warning | LWX | 15 hr |
| Jul 27, 4:06 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jul 27, 1:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 27, 1:52 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 2:42 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| Jul 27, 3:09 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Jul 27, 4:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 27, 7:06 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 31, 11:14 PM EDT | Flash Flood Watch | LWX | 72 hr |
| Aug 2, 11:46 AM EDT | Mesoscale Discussion | SPC | 119 min |
| Aug 2, 1:55 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Aug 2, 3:03 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Aug 7, 6:13 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Aug 7, 6:53 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Aug 12, 4:27 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Aug 12, 5:09 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Aug 12, 5:10 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Aug 12, 5:27 PM EDT | Areal Flood Warning | LWX | 5 hr |
| Aug 17, 3:10 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 21, 3:48 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 21, 5:03 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 28, 3:52 AM EDT | Heat Advisory | LWX | 16 hr |
| Aug 29, 3:49 AM EDT | Heat Advisory | LWX | 16 hr |
| Sep 1, 4:50 AM EDT | Areal Flood Warning | LWX | 3 hr |
| Sep 1, 9:52 PM EDT | Areal Flood Warning | LWX | 109 min |
| Sep 4, 2:17 AM EDT | Heat Advisory | LWX | 17 hr |
| Sep 4, 3:49 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Sep 4, 4:11 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Sep 8, 2:34 PM EDT | Coastal Flood Advisory | LWX | 6 days |
| Sep 9, 5:15 AM EDT | Coastal Flood Warning | LWX | 3 days |
| Sep 11, 5:24 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| Sep 12, 7:56 PM EDT | Coastal Flood Advisory | LWX | 5 days |
| Sep 13, 2:48 AM EDT | Coastal Flood Watch | LWX | 59 hr |
| Sep 16, 3:31 AM EDT | Coastal Flood Advisory | LWX | 56 hr |
| Sep 16, 3:11 PM EDT | Flash Flood Watch | LWX | 52 hr |
| Sep 17, 3:25 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 17, 3:38 PM EDT | Tornado Warning | LWX | 22 min |
| Sep 17, 3:42 PM EDT | Tornado Watch | SPC | 4 hr |
| Sep 17, 7:09 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Sep 20, 1:59 PM EDT | Coastal Flood Advisory | LWX | 45 hr |
| Sep 23, 8:09 PM EDT | Coastal Flood Advisory | LWX | 3 days |
| Sep 26, 3:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 26, 5:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Oct 10, 2:26 PM EDT | Coastal Flood Advisory | LWX | 7 hr |
| Oct 10, 3:42 PM EDT | Flash Flood Watch | LWX | 31 hr |
| Oct 11, 3:12 AM EDT | Wind Advisory | LWX | 29 hr |
| Oct 11, 7:59 PM EDT | Areal Flood Warning | LWX | 24 hr |
| Oct 11, 10:12 PM EDT | Areal Flood Warning | LWX | 15 hr |
| Oct 13, 12:19 AM EDT | Coastal Flood Advisory | LWX | 25 hr |
| Oct 13, 2:13 PM EDT | Coastal Flood Advisory | LWX | 9 hr |
| Oct 18, 2:57 PM EDT | Frost Advisory | LWX | 18 hr |
| Oct 21, 4:05 AM EDT | Frost Advisory | LWX | 30 hr |
| Oct 24, 2:43 PM EDT | Frost Advisory | LWX | 18 hr |
| Oct 26, 8:53 PM EDT | Coastal Flood Advisory | LWX | 16 hr |
| Nov 2, 6:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Nov 2, 10:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Nov 2, 10:25 PM EDT | Tornado Warning | LWX | 20 min |
| Nov 2, 10:40 PM EDT | Tornado Warning | LWX | 20 min |
| Nov 6, 11:52 AM EST | Severe Thunderstorm Warning | LWX | 38 min |
| Nov 9, 1:51 PM EST | Freeze Warning | LWX | 43 hr |
| Nov 14, 3:54 PM EST | Winter Weather Advisory | LWX | 36 hr |
| Nov 15, 12:28 AM EST | Flood Watch | LWX | 14 hr |
| Nov 26, 6:45 AM EST | Coastal Flood Advisory | LWX | 18 hr |
| Nov 27, 2:03 PM EST | Wind Advisory | LWX | 24 hr |
| Dec 1, 2:28 PM EST | Coastal Flood Advisory | LWX | 36 hr |
| Dec 2, 8:24 AM EST | Dense Fog Advisory | LWX | 5 hr |
| Dec 8, 6:02 PM EST | Winter Weather Advisory | LWX | 30 hr |
| Dec 13, 2:04 PM EST | Flood Watch | LWX | 63 hr |
| Dec 19, 3:48 AM EST | Flood Watch | LWX | 59 hr |
| Dec 20, 6:00 PM EST | Coastal Flood Advisory | LWX | 39 hr |
| Dec 28, 7:45 PM EST | Dense Fog Advisory | LWX | 11 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 | 25 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 6 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 29 |
| Flooding | |
| Areal Flood Warning | 14 |
| Flash Flood Warning | 1 |
| Flash Flood Watch | 10 |
| Flood Watch | 7 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 6 |
| Heat | |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 3 |
| Wind and dust | |
| High Wind Warning | 1 |
| High Wind Watch | 1 |
| Wind Advisory | 5 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
| Coast and beach | |
| Coastal Flood Warning | 1 |
| Coastal Flood Watch | 1 |
| Coastal Flood Advisory | 21 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20172019
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.