Alert archive / Maryland / Baltimore County
Weather alerts in Baltimore County, Maryland, 2024
207 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Baltimore County and its neighbors
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Alerts
- 207
- Warnings
- 80
- Watches
- 35
- Advisories
- 61
- Busiest month
- August47 alerts
- Busiest day
- June 6, 202411 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
3 of 11 tornado warnings covering Baltimore County in 2024 had a tornado report inside them; 5 of 5 tornado reports fell inside a warning, on average 25 minutes after it went out.
Baltimore County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 11 | 3 | 73% | 5 | 100% | 25 min |
| Severe thunderstorm warnings | 26 | 16 | 38% | 15 | 93% | 20 min |
| Flash flood warnings | 16 | 7 | 56% | 6 | 100% | 55 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, 4:49 AM EST | Winter Weather Advisory | LWX | 68 hr |
| Jan 7, 6:02 PM EST | Coastal Flood Watch | LWX | 33 hr |
| Jan 8, 1:57 AM EST | Flood Watch | LWX | 44 hr |
| Jan 8, 3:48 AM EST | Wind Advisory | LWX | 41 hr |
| Jan 8, 2:33 PM EST | High Wind Warning | LWX | 31 hr |
| Jan 8, 3:41 PM EST | Coastal Flood Warning | LWX | 47 hr |
| Jan 9, 2:40 PM EST | Wind Advisory | LWX | 25 hr |
| Jan 9, 4:24 PM EST | Areal Flood Warning | LWX | 16 hr |
| Jan 9, 5:35 PM EST | Areal Flood Warning | LWX | 14 hr |
| Jan 10, 1:05 AM EST | Coastal Flood Advisory | LWX | 19 hr |
| Jan 11, 2:06 PM EST | Flood Watch | LWX | 33 hr |
| Jan 11, 3:10 PM EST | Wind Advisory | LWX | 50 hr |
| Jan 12, 2:24 AM EST | Wind Advisory | LWX | 39 hr |
| Jan 12, 4:16 AM EST | Coastal Flood Advisory | LWX | 44 hr |
| Jan 14, 2:09 AM EST | Wind Advisory | LWX | 15 hr |
| Jan 14, 10:08 AM EST | Special Weather Statement | LWX | 52 min |
| Jan 14, 10:39 AM EST | Special Weather Statement | LWX | 66 min |
| Jan 14, 10:55 AM EST | Special Weather Statement | LWX | 50 min |
| Jan 14, 2:35 PM EST | Winter Weather Advisory | LWX | 43 hr |
| Jan 15, 10:11 AM EST | Winter Storm Warning | LWX | 24 hr |
| Jan 18, 3:08 AM EST | Winter Storm Warning | LWX | 64 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 26, 7:22 PM EST | Dense Fog Advisory | LWX | 11 hr |
| Jan 27, 1:40 PM EST | Flood Watch | LWX | 18 hr |
| Feb 12, 4:07 AM EST | Winter Weather Advisory | LWX | 31 hr |
| Feb 12, 9:57 AM EST | Winter Storm Watch | LWX | 5 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, 3:24 AM EST | Winter Weather Advisory | LWX | 25 hr |
| Feb 27, 2:58 PM EST | Wind Advisory | LWX | 36 hr |
| Mar 6, 4:36 AM EST | Dense Fog Advisory | LWX | 7 hr |
| Mar 8, 6:12 PM EST | Coastal Flood Advisory | LWX | 38 hr |
| Mar 9, 3:15 AM EST | Wind Advisory | LWX | 61 hr |
| Mar 21, 2:10 PM EDT | Flood Watch | LWX | 47 hr |
| Mar 25, 4:37 AM EDT | Coastal Flood Advisory | LWX | 62 hr |
| Mar 31, 1:41 PM EDT | Flood Watch | LWX | 3 days |
| Apr 3, 11:37 AM EDT | Areal Flood Warning | LWX | 14 hr |
| Apr 3, 2:42 PM EDT | Areal Flood Warning | LWX | 6 hr |
| Apr 10, 9:03 AM EDT | Coastal Flood Watch | LWX | 30 hr |
| Apr 10, 3:23 PM EDT | Coastal Flood Advisory | LWX | 43 hr |
| Apr 11, 8:54 AM EDT | Coastal Flood Warning | LWX | 29 hr |
| Apr 12, 3:29 AM EDT | Wind Advisory | LWX | 37 hr |
| Apr 15, 1:50 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Apr 19, 8:09 AM EDT | Coastal Flood Advisory | LWX | 20 hr |
| Apr 21, 12:42 PM EDT | Frost Advisory | LWX | 19 hr |
| Apr 22, 10:45 AM EDT | Frost Advisory | LWX | 22 hr |
| Apr 23, 11:28 AM EDT | Coastal Flood Advisory | LWX | 25 hr |
| Apr 25, 1:54 PM EDT | Frost Advisory | LWX | 18 hr |
| Apr 25, 8:04 PM EDT | Coastal Flood Advisory | LWX | 18 hr |
| May 3, 9:04 AM EDT | Coastal Flood Advisory | LWX | 48 hr |
| May 6, 3:27 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| May 10, 2:46 PM EDT | Coastal Flood Advisory | LWX | 53 hr |
| May 12, 12:13 PM EDT | Severe Thunderstorm Warning | LWX | 20 min |
| May 12, 1:26 PM EDT | Severe Thunderstorm Warning | LWX | 19 min |
| May 22, 3:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 23, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | 14 min |
| May 27, 11:53 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 3:39 PM EDT | Tornado Watch | SPC | 7 hr |
| May 27, 4:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| May 27, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| May 27, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | 65 min |
| May 27, 7:28 PM EDT | Flash Flood Warning | LWX | 2 hr |
| May 27, 7:40 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 27, 8:01 PM EDT | Flash Flood Warning | LWX | 86 min |
| May 27, 8:11 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Jun 5, 4:04 AM EDT | Flood Watch | LWX | 18 hr |
| Jun 5, 6:17 PM EDT | Tornado Warning | LWX | 28 min |
| Jun 5, 6:59 PM EDT | Tornado Warning | LWX | 46 min |
| Jun 5, 7:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 5, 7:37 PM EDT | Tornado Warning | LWX | 18 min |
| Jun 5, 8:01 PM EDT | Tornado Warning | LWX | 44 min |
| Jun 5, 8:04 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jun 5, 8:06 PM EDT | Tornado Warning | LWX | 39 min |
| Jun 5, 8:13 PM EDT | Tornado Warning | LWX | 32 min |
| Jun 5, 8:21 PM EDT | Tornado Warning | LWX | 24 min |
| Jun 5, 8:26 PM EDT | Tornado Warning | LWX | 34 min |
| Jun 5, 8:42 PM EDT | Tornado Warning | LWX | 48 min |
| Jun 5, 8:57 PM EDT | Tornado Warning | LWX | 33 min |
| Jun 5, 9:26 PM EDT | Tornado Warning | LWX | 36 min |
| Jun 6, 1:45 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Jun 6, 2:26 PM EDT | Severe Thunderstorm Watch | SPC | 7 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 26, 4:02 PM EDT | Mesoscale Discussion | SPC | 118 min |
| Jun 26, 6:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 8:51 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| Jun 26, 10:44 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Jun 29, 10:15 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Jun 30, 12:11 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 30, 4:03 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Jul 3, 3:46 PM EDT | Heat Advisory | LWX | 28 hr |
| Jul 4, 3:52 AM EDT | Heat Advisory | LWX | 40 hr |
| Jul 5, 11:48 PM EDT | Heat Advisory | LWX | 20 hr |
| Jul 6, 3:54 AM EDT | Excessive Heat Warning | LWX | 16 hr |
| Jul 7, 3:21 PM EDT | Heat Advisory | LWX | 29 hr |
| Jul 8, 2:25 PM EDT | Heat Advisory | LWX | 30 hr |
| Jul 9, 4:15 AM EDT | Heat Advisory | LWX | 39 hr |
| Jul 9, 1:08 PM EDT | Excessive Heat Warning | LWX | 7 hr |
| Jul 9, 3:33 PM EDT | Flash Flood Warning | LWX | 72 min |
| Jul 10, 4:59 AM EDT | Excessive Heat Warning | LWX | 15 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 11, 3:01 PM EDT | Flood Watch | LWX | 42 hr |
| 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, 12:56 PM EDT | Mesoscale Discussion | SPC | 3 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 15, 5:29 PM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Jul 16, 11:44 AM EDT | Heat Advisory | LWX | 32 hr |
| Jul 16, 2:35 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 16, 3:36 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jul 16, 6:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jul 16, 7:52 PM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| Jul 16, 8:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jul 16, 9:23 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Jul 16, 10:04 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Jul 17, 2:59 AM EDT | Flood Watch | LWX | 17 hr |
| Jul 17, 2:11 PM EDT | Mesoscale Discussion | SPC | 79 min |
| Jul 17, 2:38 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 17, 4:26 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Jul 17, 4:52 PM EDT | Severe Thunderstorm Warning | LWX | 23 min |
| Jul 17, 5:56 PM EDT | Severe Thunderstorm Warning | LWX | 34 min |
| Jul 17, 6:04 PM EDT | Flash Flood Warning | LWX | 88 min |
| Jul 29, 7:29 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jul 30, 12:39 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 31, 3:25 PM EDT | Heat Advisory | LWX | 29 hr |
| Aug 1, 12:01 PM EDT | Heat Advisory | LWX | 32 hr |
| Aug 1, 2:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 4:34 AM EDT | Excessive Heat Warning | LWX | 15 hr |
| Aug 2, 7:26 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| Aug 2, 9:36 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 3, 3:38 AM EDT | Flood Watch | LWX | 17 hr |
| Aug 3, 12:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 3, 1:20 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 3, 2:53 PM EDT | Mesoscale Discussion | SPC | 67 min |
| Aug 3, 3:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Aug 3, 4:42 PM EDT | Severe Thunderstorm Warning | LWX | 48 min |
| Aug 3, 5:22 PM EDT | Severe Thunderstorm Warning | LWX | 53 min |
| Aug 6, 1:46 PM EDT | Severe Thunderstorm Warning | LWX | 29 min |
| Aug 6, 2:06 PM EDT | Severe Thunderstorm Warning | LWX | 24 min |
| Aug 6, 2:29 PM EDT | Flash Flood Warning | LWX | 110 min |
| Aug 6, 2:31 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Aug 6, 3:22 PM EDT | Flood Watch | LWX | 11 hr |
| Aug 7, 12:05 AM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 7, 2:43 PM EDT | Flood Watch | LWX | 45 hr |
| Aug 8, 4:08 AM EDT | Coastal Flood Advisory | LWX | 41 hr |
| Aug 8, 3:24 PM EDT | Coastal Flood Warning | LWX | 31 hr |
| Aug 8, 3:24 PM EDT | Coastal Flood Advisory | LWX | 35 hr |
| Aug 8, 6:37 PM EDT | Tornado Watch | SPC | 12 hr |
| Aug 8, 8:38 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 8, 11:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Aug 9, 1:50 AM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 9, 3:52 AM EDT | Flash Flood Warning | LWX | 8 hr |
| Aug 9, 4:36 AM EDT | Areal Flood Warning | LWX | 4 hr |
| Aug 9, 4:38 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 9, 6:17 AM EDT | Tornado Watch | SPC | 8 hr |
| Aug 9, 8:48 AM EDT | Flash Flood Warning | LWX | 95 min |
| Aug 9, 10:23 AM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 9, 10:26 AM EDT | Mesoscale Discussion | SPC | 94 min |
| Aug 9, 4:50 PM EDT | Areal Flood Warning | LWX | 8 hr |
| Aug 17, 1:44 PM EDT | Coastal Flood Advisory | LWX | 22 hr |
| Aug 18, 3:07 AM EDT | Flood Watch | LWX | 20 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 18, 7:03 PM EDT | Severe Thunderstorm Warning | LWX | 27 min |
| Aug 18, 7:25 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 18, 7:58 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Aug 18, 8:12 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 18, 9:48 PM EDT | Flash Flood Warning | LWX | 88 min |
| Aug 18, 11:13 PM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 27, 2:36 PM EDT | Heat Advisory | LWX | 28 hr |
| Aug 29, 5:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 18, 12:09 AM EDT | Coastal Flood Advisory | LWX | 9 days |
| Sep 22, 12:19 AM EDT | Flood Watch | LWX | 3 hr |
| Sep 22, 1:37 AM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Sep 22, 2:17 AM EDT | Flash Flood Warning | LWX | 67 min |
| Sep 26, 4:25 AM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Sep 26, 7:40 AM EDT | Flash Flood Warning | LWX | 91 min |
| Sep 26, 8:25 AM EDT | Flash Flood Warning | LWX | 87 min |
| Sep 26, 9:11 AM EDT | Areal Flood Warning | LWX | 84 min |
| Sep 26, 9:52 AM EDT | Areal Flood Warning | LWX | 44 min |
| Sep 26, 3:53 PM EDT | Coastal Flood Advisory | LWX | 8 days |
| Oct 5, 2:51 AM EDT | Dense Fog Advisory | LWX | 6 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 24, 2:05 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 26, 3:05 AM EDT | Freeze Watch | LWX | 24 hr |
| Oct 26, 7:39 PM EDT | Frost Advisory | LWX | 13 hr |
| Oct 27, 3:06 AM EDT | Freeze Warning | LWX | 30 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 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 | 26 |
| Tornado Warning | 11 |
| Severe Thunderstorm Watch | 10 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 28 |
| Special Weather Statement | 3 |
| Flooding | |
| Areal Flood Warning | 11 |
| Flash Flood Warning | 16 |
| Flood Watch | 13 |
| Winter | |
| Winter Storm Warning | 3 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 6 |
| Heat | |
| Excessive Heat Warning | 6 |
| Excessive Heat Watch | 3 |
| Heat Advisory | 12 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 9 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 10 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
| Coast and beach | |
| Coastal Flood Warning | 3 |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 16 |
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.