Alert archive / Maryland / Washington County
Weather alerts in Washington County, Maryland, 2024
147 weather alerts in 2024, 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 2024. Tap one for its archive.
- Alerts
- 147
- Warnings
- 49
- Watches
- 29
- Advisories
- 38
- Busiest month
- August32 alerts
- Busiest day
- May 27, 20248 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 Washington County in 2024 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 11 minutes after it went out.
Washington County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 1 | 50% | 1 | 100% | 11 min |
| Severe thunderstorm warnings | 25 | 15 | 40% | 8 | 100% | 17 min |
| Flash flood warnings | 5 | 4 | 20% | 3 | 100% | 54 min |
Each office's whole area, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 50 | 12 | 76% | 35 | 69% | 19 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 306 | 203 | 34% | 536 | 85% | 19 min |
| NWS Baltimore/Washington: flash flood warnings | 59 | 26 | 56% | 60 | 82% | 97 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, 2:21 PM EST | Winter Storm Watch | LWX | 19 hr |
| Jan 5, 9:31 AM EST | Winter Storm Warning | LWX | 35 hr |
| Jan 6, 11:47 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Jan 8, 1:57 AM EST | Flood Watch | LWX | 44 hr |
| Jan 8, 10:32 AM EST | River Flood Watch | LWX | 31 hr |
| Jan 8, 10:36 AM EST | River Flood Watch | LWX | 21 days |
| Jan 9, 2:40 PM EST | Wind Advisory | LWX | 25 hr |
| Jan 9, 5:27 PM EST | River Flood Warning | LWX | 38 hr |
| Jan 9, 5:34 PM EST | River Flood Watch | LWX | 21 days |
| Jan 12, 2:24 AM EST | Wind Advisory | LWX | 39 hr |
| Jan 14, 2:09 AM EST | Wind Advisory | LWX | 15 hr |
| Jan 14, 9:12 AM EST | Special Weather Statement | LWX | 63 min |
| Jan 14, 2:35 PM EST | Winter Weather Advisory | LWX | 43 hr |
| Jan 18, 8:26 AM EST | Winter Weather Advisory | LWX | 33 hr |
| Jan 24, 6:19 PM EST | Dense Fog Advisory | LWX | 41 hr |
| Jan 27, 4:04 PM EST | River Flood Watch | LWX | 17 hr |
| Jan 28, 9:19 AM EST | River Flood Warning | LWX | 32 hr |
| Feb 12, 4:07 AM EST | Winter Weather Advisory | LWX | 31 hr |
| Feb 15, 9:46 AM EST | Winter Storm Watch | LWX | 24 hr |
| Feb 16, 3:24 AM EST | Winter Storm Warning | LWX | 28 hr |
| Feb 16, 7:40 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 16, 10:33 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 27, 2:58 PM EST | Wind Advisory | LWX | 36 hr |
| Mar 3, 2:23 AM EST | Dense Fog Advisory | LWX | 7 hr |
| Mar 9, 3:15 AM EST | Wind Advisory | LWX | 61 hr |
| Mar 9, 9:23 AM EST | River Flood Watch | LWX | 11 hr |
| Mar 9, 9:23 AM EST | River Flood Watch | LWX | 12 hr |
| Mar 10, 10:34 AM EDT | River Flood Warning | LWX | 16 hr |
| Mar 10, 9:20 PM EDT | Special Weather Statement | LWX | 25 min |
| Mar 19, 12:02 PM EDT | Wind Advisory | LWX | 32 hr |
| Mar 31, 1:41 PM EDT | Flood Watch | LWX | 3 days |
| Apr 2, 10:05 AM EDT | River Flood Watch | LWX | 21 hr |
| Apr 2, 10:05 AM EDT | River Flood Watch | LWX | 21 hr |
| Apr 3, 7:19 AM EDT | River Flood Warning | LWX | 38 hr |
| Apr 3, 7:21 AM EDT | River Flood Warning | LWX | 52 hr |
| Apr 3, 11:10 AM EDT | Areal Flood Warning | LWX | 8 hr |
| Apr 12, 3:29 AM EDT | Wind Advisory | LWX | 37 hr |
| Apr 15, 11:01 AM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 21, 4:04 AM EDT | Freeze Watch | LWX | 9 hr |
| Apr 21, 12:42 PM EDT | Freeze Warning | LWX | 19 hr |
| Apr 22, 10:45 AM EDT | Frost Advisory | LWX | 22 hr |
| May 6, 3:27 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| May 11, 9:22 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| May 11, 9:24 PM EDT | Tornado Warning | LWX | 21 min |
| May 11, 9:42 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| May 11, 9:59 PM EDT | Special Weather Statement | CTP | 31 min |
| May 20, 5:04 AM EDT | Dense Fog Advisory | LWX | 5 hr |
| May 22, 2:52 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| May 22, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 22, 4:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 25, 6:38 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| May 25, 7:14 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| May 25, 7:45 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| May 26, 8:44 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 26, 9:05 PM EDT | Severe Thunderstorm Warning | LWX | 55 min |
| May 26, 9:56 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| May 26, 10:18 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 26, 10:38 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| May 27, 11:53 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 3:49 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| May 27, 4:16 PM EDT | Severe Thunderstorm Warning | LWX | 59 min |
| May 29, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| May 29, 4:55 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| May 29, 5:15 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Jun 5, 5:31 PM EDT | Tornado Warning | LWX | 19 min |
| Jun 17, 12:35 PM EDT | Heat Advisory | LWX | 31 hr |
| Jun 20, 4:59 PM EDT | Excessive Heat Watch | LWX | 19 hr |
| Jun 21, 12:27 PM EDT | Heat Advisory | LWX | 32 hr |
| Jun 22, 12:12 PM EDT | Heat Advisory | LWX | 30 hr |
| Jun 23, 7:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 26, 6:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 9:10 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Jun 29, 3:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 29, 4:21 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 29, 7:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 29, 7:49 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Jul 4, 3:52 AM EDT | Heat Advisory | LWX | 40 hr |
| Jul 8, 2:25 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 9, 4:15 AM EDT | Heat Advisory | LWX | 39 hr |
| Jul 10, 12:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 10, 1:37 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 10, 4:22 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Jul 10, 7:04 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jul 10, 7:17 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Jul 13, 1:39 PM EDT | Excessive Heat Watch | LWX | 23 hr |
| Jul 14, 9:33 AM EDT | Excessive Heat Watch | LWX | 27 hr |
| Jul 14, 12:59 PM EDT | Excessive Heat Warning | LWX | 31 hr |
| Jul 15, 12:55 PM EDT | Excessive Heat Warning | LWX | 31 hr |
| Jul 15, 3:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 16, 11:44 AM EDT | Heat Advisory | LWX | 32 hr |
| Jul 16, 2:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 17, 2:11 PM EDT | Mesoscale Discussion | SPC | 79 min |
| Jul 20, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Jul 22, 7:30 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Jul 22, 8:37 PM EDT | Flash Flood Warning | LWX | 68 min |
| Jul 22, 9:04 PM EDT | Flash Flood Warning | LWX | 109 min |
| Jul 30, 12:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 1, 12:01 PM EDT | Heat Advisory | LWX | 32 hr |
| Aug 1, 2:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 3, 12:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 3, 1:47 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| Aug 3, 2:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 3, 5:43 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Aug 3, 6:13 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Aug 6, 6:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 6, 11:00 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 7, 2:43 PM EDT | Flood Watch | LWX | 45 hr |
| Aug 8, 11:49 AM EDT | River Flood Watch | LWX | 25 hr |
| Aug 8, 11:49 AM EDT | River Flood Watch | LWX | 31 hr |
| Aug 8, 11:49 AM EDT | River Flood Watch | LWX | 31 hr |
| Aug 8, 6:37 PM EDT | Tornado Watch | SPC | 12 hr |
| Aug 8, 11:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 8, 11:53 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 9, 2:49 AM EDT | Areal Flood Warning | LWX | 28 hr |
| Aug 9, 4:38 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 9, 12:19 PM EDT | River Flood Warning | LWX | 18 hr |
| Aug 9, 6:20 PM EDT | River Flood Warning | LWX | 9 hr |
| Aug 18, 1:09 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Aug 18, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 18, 4:30 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Aug 27, 2:36 PM EDT | Heat Advisory | LWX | 28 hr |
| Aug 29, 10:59 AM EDT | Flood Watch | LWX | 12 hr |
| Aug 29, 1:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Aug 29, 3:54 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 29, 5:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Aug 29, 9:10 PM EDT | Flash Flood Warning | LWX | 116 min |
| Aug 31, 1:27 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 31, 4:01 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| Aug 31, 4:37 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Sep 21, 2:37 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 5, 2:51 AM EDT | Dense Fog Advisory | LWX | 6 hr |
| Oct 10, 12:49 PM EDT | Frost Advisory | LWX | 20 hr |
| Oct 14, 1:13 PM EDT | Frost Advisory | LWX | 17 hr |
| Oct 15, 1:34 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 16, 2:01 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 17, 1:54 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 17, 11:24 PM EDT | Freeze Warning | LWX | 10 hr |
| Nov 1, 9:54 AM EDT | Red Flag Warning | LWX | 8 hr |
| Nov 7, 5:33 PM EST | Red Flag Warning | LWX | 24 hr |
| Nov 20, 1:59 AM EST | Wind Advisory | LWX | 23 hr |
| Dec 4, 4:22 AM EST | Wind Advisory | LWX | 44 hr |
| Dec 9, 9:31 PM EST | Dense Fog Advisory | LWX | 14 hr |
| Dec 10, 5:08 PM EST | Dense Fog Advisory | LWX | 13 hr |
| Dec 14, 12:26 PM EST | Winter Weather Advisory | LWX | 40 hr |
| Dec 16, 2:32 PM EST | Dense Fog Advisory | LWX | 5 hr |
| Dec 23, 3:00 AM EST | Winter Weather Advisory | LWX | 40 hr |
| Dec 28, 8:54 PM EST | Dense Fog Advisory | LWX | 12 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 | 2 |
| Severe Thunderstorm Watch | 7 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 3 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 5 |
| River Flood Warning | 7 |
| Flood Watch | 4 |
| River Flood Watch | 11 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Warning | 2 |
| Excessive Heat Watch | 3 |
| Heat Advisory | 9 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 6 |
| Wind and dust | |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 9 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20232025
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.