Alert archive / Maryland / Washington County
Weather alerts in Washington County, Maryland, 2018
202 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Washington County and its neighbors
Each county as a circle sized by its count in 2018. Tap one for its archive.
- Alerts
- 202
- Warnings
- 92
- Watches
- 51
- Advisories
- 36
- Busiest month
- May36 alerts
- Busiest day
- August 21, 201810 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Washington County, 2018
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 36 | 21 | 42% | 22 | 68% | 18 min |
| Flash flood warnings | 2 | 1 | 50% | 6 | 100% | 65 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 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 7, 2:46 PM EST | Winter Weather Advisory | LWX | 33 hr |
| Jan 12, 5:49 PM EST | Severe Thunderstorm Warning | LWX | 56 min |
| Jan 13, 9:40 PM EST | Areal Flood Warning | LWX | 60 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 6, 2:00 PM EST | Winter Storm Warning | LWX | 26 hr |
| Feb 7, 5:28 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 16, 9:12 PM EST | Winter Weather Advisory | LWX | 31 hr |
| Feb 17, 1:51 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 23, 8:30 PM EST | Dense Fog Advisory | LWX | 15 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 1, 10:37 PM EST | Special Weather Statement | LWX | 7 hr |
| Mar 2, 7:57 PM EST | Wind Advisory | LWX | 10 hr |
| Mar 19, 12:06 PM EDT | Winter Storm Watch | LWX | 25 hr |
| Mar 19, 3:42 PM EDT | Winter Storm Warning | LWX | 52 hr |
| Mar 19, 3:42 PM EDT | Winter Weather Advisory | LWX | 28 hr |
| Mar 20, 12:19 PM EDT | Mesoscale Discussion | SPC | 4 hr |
| Mar 29, 4:23 AM EDT | Dense Fog Advisory | LWX | 6 hr |
| Apr 1, 4:01 AM EDT | Winter Weather Advisory | LWX | 27 hr |
| Apr 2, 3:47 AM EDT | Mesoscale Discussion | SPC | 6 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, 4:29 AM EDT | Freeze Watch | LWX | 12 hr |
| Apr 16, 10:17 PM EDT | River Flood Warning | LWX | 32 hr |
| Apr 17, 4:08 AM EDT | Freeze Watch | LWX | 9 hr |
| Apr 17, 1:24 PM EDT | Freeze Warning | LWX | 19 hr |
| Apr 19, 4:27 AM EDT | Freeze Watch | LWX | 10 hr |
| Apr 19, 2:22 PM EDT | Freeze Warning | LWX | 18 hr |
| Apr 20, 4:16 AM EDT | Freeze Watch | LWX | 10 hr |
| Apr 20, 2:28 PM EDT | Freeze Warning | LWX | 19 hr |
| Apr 29, 3:15 PM EDT | Frost Advisory | LWX | 17 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 7, 2:34 AM EDT | Dense Fog Advisory | LWX | 6 hr |
| May 10, 1:14 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 10, 3:53 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| May 12, 2:47 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 12, 5:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| May 13, 4:28 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 13, 6:05 PM EDT | Severe Thunderstorm Warning | LWX | 55 min |
| May 13, 6:50 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| May 13, 7:22 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| May 14, 5:32 AM EDT | Dense Fog Advisory | LWX | 4 hr |
| May 14, 11:56 AM EDT | Mesoscale Discussion | SPC | 64 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, 4:19 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| May 14, 4:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| May 14, 5:13 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| May 15, 4:33 AM EDT | Flash Flood Watch | LWX | 20 hr |
| May 15, 7:18 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| May 15, 7:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| May 15, 8:20 PM EDT | Flash Flood Warning | LWX | 3 hr |
| May 15, 10:10 PM EDT | Areal Flood Warning | LWX | 8 hr |
| May 15, 10:32 PM EDT | Areal Flood Warning | LWX | 11 hr |
| May 16, 1:40 PM EDT | Flood Watch | LWX | 3 days |
| May 16, 6:38 PM EDT | Areal Flood Warning | LWX | 16 hr |
| May 17, 3:42 PM EDT | River Flood Warning | LWX | 4 days |
| May 17, 3:43 PM EDT | River Flood Warning | LWX | 36 hr |
| May 19, 1:59 AM EDT | Areal Flood Warning | LWX | 27 hr |
| May 26, 4:38 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| May 26, 4:56 PM EDT | Areal Flood Warning | LWX | 5 hr |
| May 26, 5:25 PM EDT | Severe Thunderstorm Warning | LWX | 28 min |
| May 27, 4:25 AM EDT | Flash Flood Watch | LWX | 16 hr |
| May 27, 1:29 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| May 31, 4:06 AM EDT | Flash Flood Watch | LWX | 17 hr |
| May 31, 4:10 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| May 31, 4:44 PM EDT | Areal Flood Warning | LWX | 2 hr |
| May 31, 5:12 PM EDT | Flash Flood Warning | LWX | 97 min |
| Jun 1, 9:07 PM EDT | Areal Flood Warning | LWX | 18 hr |
| Jun 1, 9:39 PM EDT | Areal Flood Warning | LWX | 11 hr |
| Jun 2, 3:13 AM EDT | Flash Flood Watch | LWX | 25 hr |
| Jun 2, 3:23 AM EDT | River Flood Watch | LWX | 16 hr |
| Jun 2, 4:55 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Jun 2, 5:52 PM EDT | River Flood Warning | LWX | 67 hr |
| Jun 2, 5:56 PM EDT | River Flood Watch | LWX | 18 hr |
| Jun 3, 4:11 AM EDT | Flood Watch | LWX | 14 hr |
| Jun 3, 7:25 AM EDT | Areal Flood Warning | LWX | 20 hr |
| Jun 3, 12:02 PM EDT | River Flood Watch | LWX | 2 hr |
| Jun 3, 12:15 PM EDT | River Flood Warning | LWX | 42 hr |
| Jun 3, 1:59 PM EDT | River Flood Warning | LWX | 31 hr |
| Jun 3, 3:35 PM EDT | River Flood Warning | LWX | 30 hr |
| Jun 5, 3:05 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 5, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| Jun 9, 1:34 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 3:47 AM EDT | Flash Flood Watch | LWX | 24 hr |
| Jun 13, 10:33 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Jun 18, 9:42 AM EDT | Heat Advisory | LWX | 10 hr |
| Jun 18, 2:42 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Jun 19, 12:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 20, 10:27 AM EDT | Flash Flood Watch | LWX | 9 hr |
| Jun 20, 4:59 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Jun 20, 6:08 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Jun 24, 5:58 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| 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, 1:03 PM EDT | Mesoscale Discussion | SPC | 72 min |
| Jul 2, 1:40 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 5, 9:56 AM EDT | Flash Flood Watch | LWX | 17 hr |
| Jul 17, 8:08 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jul 21, 5:05 AM EDT | Flash Flood Watch | LWX | 21 hr |
| Jul 23, 4:59 AM EDT | Flash Flood Watch | LWX | 68 hr |
| Jul 23, 10:46 AM EDT | River Flood Watch | LWX | 24 hr |
| Jul 23, 10:47 AM EDT | River Flood Watch | LWX | 24 hr |
| Jul 23, 2:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Jul 23, 3:38 PM EDT | Areal Flood Warning | LWX | 11 hr |
| Jul 24, 10:20 AM EDT | River Flood Warning | LWX | 54 hr |
| Jul 24, 10:21 AM EDT | River Flood Warning | LWX | 39 hr |
| Jul 26, 1:47 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Jul 27, 1:52 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 27, 3:21 PM EDT | Areal Flood Warning | LWX | 114 min |
| Jul 27, 4:31 PM EDT | Severe Thunderstorm Warning | LWX | 59 min |
| Jul 27, 4:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 1, 1:28 AM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 1, 4:10 AM EDT | Flash Flood Watch | LWX | 3 days |
| Aug 1, 3:15 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 1, 6:47 PM EDT | Areal Flood Warning | LWX | 2 hr |
| Aug 2, 6:25 PM EDT | River Flood Watch | LWX | 20 hr |
| Aug 2, 7:00 PM EDT | River Flood Warning | LWX | 8 hr |
| Aug 3, 8:51 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 4, 2:23 AM EDT | Dense Fog Advisory | LWX | 5 hr |
| Aug 6, 1:01 PM EDT | Severe Thunderstorm Warning | LWX | 25 min |
| Aug 7, 4:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Aug 8, 8:05 PM EDT | Severe Thunderstorm Warning | LWX | 40 min |
| Aug 8, 8:28 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Aug 13, 4:21 AM EDT | Flash Flood Watch | LWX | 18 hr |
| Aug 13, 1:53 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Aug 17, 3:24 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Aug 17, 3:40 PM EDT | Severe Thunderstorm Warning | LWX | 65 min |
| Aug 21, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 3:43 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Aug 21, 3:59 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Aug 21, 4:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 21, 5:12 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Aug 21, 5:52 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Aug 21, 6:02 PM EDT | Areal Flood Warning | LWX | 9 hr |
| Aug 21, 6:09 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Aug 21, 6:59 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Aug 21, 7:06 PM EDT | Mesoscale Discussion | SPC | 84 min |
| Aug 21, 8:25 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Aug 21, 8:35 PM EDT | Areal Flood Warning | LWX | 22 hr |
| Aug 28, 3:52 AM EDT | Heat Advisory | LWX | 16 hr |
| Aug 29, 3:49 AM EDT | Heat Advisory | LWX | 16 hr |
| Sep 2, 7:23 AM EDT | Dense Fog Advisory | LWX | 2 hr |
| Sep 4, 2:17 AM EDT | Heat Advisory | LWX | 17 hr |
| Sep 7, 5:34 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Sep 7, 6:17 PM EDT | Areal Flood Warning | LWX | 4 hr |
| Sep 8, 2:46 PM EDT | Flood Watch | LWX | 39 hr |
| Sep 9, 9:45 AM EDT | Areal Flood Warning | LWX | 12 hr |
| Sep 9, 12:48 PM EDT | River Flood Warning | LWX | 52 hr |
| Sep 9, 12:54 PM EDT | River Flood Warning | LWX | 71 hr |
| Sep 9, 9:35 PM EDT | Areal Flood Warning | LWX | 22 hr |
| Sep 13, 2:17 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Sep 13, 5:02 PM EDT | River Flood Warning | LWX | 7 hr |
| Sep 16, 3:11 PM EDT | Flash Flood Watch | LWX | 52 hr |
| Sep 16, 9:22 PM EDT | River Flood Watch | LWX | 25 hr |
| Sep 16, 9:26 PM EDT | River Flood Watch | LWX | 12 hr |
| Sep 16, 9:38 PM EDT | River Flood Watch | LWX | 57 hr |
| Sep 26, 11:00 AM EDT | River Flood Warning | LWX | 21 hr |
| Sep 26, 3:40 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Sep 26, 4:32 PM EDT | Severe Thunderstorm Warning | LWX | 58 min |
| Sep 27, 2:39 AM EDT | Flood Watch | LWX | 27 hr |
| Sep 27, 9:26 PM EDT | River Flood Warning | LWX | 61 hr |
| Sep 27, 10:06 PM EDT | Areal Flood Warning | LWX | 31 hr |
| Sep 28, 12:09 AM EDT | Areal Flood Warning | LWX | 22 hr |
| Sep 28, 3:54 AM EDT | River Flood Warning | LWX | 22 hr |
| Sep 28, 8:44 AM EDT | River Flood Watch | LWX | 41 hr |
| Sep 28, 9:54 AM EDT | River Flood Warning | LWX | 32 hr |
| Oct 8, 2:58 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Oct 17, 2:46 PM EDT | Freeze Watch | LWX | 24 hr |
| Oct 18, 2:57 PM EDT | Frost Advisory | LWX | 18 hr |
| Oct 20, 1:10 PM EDT | Wind Advisory | LWX | 18 hr |
| Oct 21, 4:05 AM EDT | Frost Advisory | LWX | 30 hr |
| Oct 21, 4:05 AM EDT | Freeze Warning | LWX | 30 hr |
| Nov 13, 3:46 PM EST | Winter Storm Watch | LWX | 24 hr |
| Nov 14, 3:54 PM EST | Winter Storm Warning | LWX | 36 hr |
| Nov 15, 3:18 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 15, 9:56 AM EST | Mesoscale Discussion | SPC | 6 hr |
| Nov 23, 3:32 AM EST | Winter Weather Advisory | LWX | 36 hr |
| Nov 27, 2:03 PM EST | Wind Advisory | LWX | 24 hr |
| Dec 2, 6:32 PM EST | Dense Fog Advisory | LWX | 11 hr |
| Dec 13, 2:04 PM EST | Flood Watch | LWX | 63 hr |
| Dec 15, 9:44 AM EST | River Flood Watch | LWX | 6 hr |
| Dec 15, 3:03 PM EST | River Flood Warning | LWX | 61 hr |
| Dec 15, 3:09 PM EST | River Flood Watch | LWX | 63 hr |
| Dec 15, 9:42 PM EST | River Flood Watch | LWX | 24 hr |
| Dec 16, 3:20 AM EST | River Flood Warning | LWX | 38 hr |
| Dec 19, 3:48 AM EST | Flood Watch | LWX | 59 hr |
| Dec 20, 5:05 PM EST | River Flood Watch | LWX | 11 hr |
| Dec 20, 5:08 PM EST | River Flood Watch | LWX | 24 hr |
| Dec 20, 5:11 PM EST | River Flood Watch | LWX | 24 hr |
| Dec 20, 5:35 PM EST | River Flood Watch | LWX | 17 hr |
| Dec 21, 4:16 PM EST | Mesoscale Discussion | SPC | 59 min |
| 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 | 36 |
| Severe Thunderstorm Watch | 6 |
| Mesoscale Discussion | 22 |
| Special Weather Statement | 1 |
| Flooding | |
| Areal Flood Warning | 25 |
| Flash Flood Warning | 2 |
| River Flood Warning | 19 |
| Flash Flood Watch | 12 |
| Flood Watch | 6 |
| River Flood Watch | 17 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 7 |
| Cold | |
| Freeze Warning | 4 |
| Freeze Watch | 5 |
| 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 | 10 |
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.