Alert archive / Maryland / Carroll County
Weather alerts in Carroll County, Maryland, 2024
137 weather alerts in 2024, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Carroll County and its neighbors
Each county as a circle sized by its count in 2024. Tap one for its archive.
- Alerts
- 137
- Warnings
- 38
- Watches
- 25
- Advisories
- 43
- Busiest month
- August32 alerts
- Busiest day
- August 9, 202413 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 6 tornado warnings covering Carroll County in 2024 had a tornado report inside them; 1 of 4 tornado reports fell inside a warning, on average 10 minutes after it went out.
Carroll County, 2024
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 1 | 83% | 4 | 25% | 10 min |
| Severe thunderstorm warnings | 17 | 11 | 35% | 16 | 75% | 24 min |
| Flash flood warnings | 3 | 0 | 100% | 1 | 0% |
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, 3:48 AM EST | Wind Advisory | LWX | 41 hr |
| Jan 9, 2:40 PM EST | Wind Advisory | LWX | 25 hr |
| Jan 9, 8:09 PM EST | Areal Flood Warning | LWX | 16 hr |
| Jan 12, 2:24 AM EST | Wind Advisory | LWX | 39 hr |
| Jan 14, 2:09 AM EST | Wind Advisory | LWX | 15 hr |
| Jan 14, 9:34 AM EST | Special Weather Statement | LWX | 56 min |
| Jan 14, 10:13 AM EST | Special Weather Statement | LWX | 32 min |
| Jan 14, 10:49 AM EST | Special Weather Statement | LWX | 56 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 |
| 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 16, 10:33 PM EST | Mesoscale Discussion | SPC | 4 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 9, 3:15 AM EST | Wind Advisory | LWX | 61 hr |
| Mar 10, 9:18 PM EDT | Special Weather Statement | LWX | 27 min |
| Mar 21, 2:10 PM EDT | Flood Watch | LWX | 47 hr |
| Mar 31, 1:41 PM EDT | Flood Watch | LWX | 3 days |
| Apr 12, 3:29 AM EDT | Wind Advisory | LWX | 37 hr |
| Apr 21, 12:42 PM EDT | Frost Advisory | LWX | 19 hr |
| Apr 22, 10:45 AM EDT | Frost Advisory | LWX | 22 hr |
| Apr 25, 1:54 PM EDT | Frost Advisory | LWX | 18 hr |
| May 6, 3:27 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| 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, 8:08 PM EDT | Severe Thunderstorm Warning | LWX | 33 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, 3:39 PM EDT | Tornado Watch | SPC | 7 hr |
| May 27, 5:38 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| May 27, 6:10 PM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| May 27, 6:16 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| May 27, 6:55 PM EDT | Severe Thunderstorm Warning | LWX | 65 min |
| Jun 5, 6:17 PM EDT | Tornado Warning | LWX | 28 min |
| Jun 5, 7:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jun 5, 7:32 PM EDT | Tornado Warning | LWX | 28 min |
| Jun 5, 8:06 PM EDT | Tornado Warning | LWX | 39 min |
| 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 29, 9:49 PM EDT | Severe Thunderstorm Warning | LWX | 26 min |
| Jun 29, 10:15 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| 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 4, 3:52 AM EDT | Heat Advisory | LWX | 40 hr |
| Jul 5, 11:48 PM EDT | Heat Advisory | LWX | 20 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 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 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 | Heat Advisory | LWX | 31 hr |
| Jul 15, 12:55 PM EDT | Heat Advisory | LWX | 31 hr |
| Jul 15, 3:41 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 15, 5:06 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| 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 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 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 2, 7:26 PM EDT | Severe Thunderstorm Warning | LWX | 49 min |
| 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 6, 6:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| 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, 6:37 PM EDT | Tornado Watch | SPC | 12 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, 7:40 AM EDT | Tornado Warning | LWX | 20 min |
| Aug 9, 8:04 AM EDT | Tornado Warning | LWX | 26 min |
| Aug 9, 8:48 AM EDT | Flash Flood Warning | LWX | 95 min |
| Aug 9, 8:57 AM EDT | Tornado Warning | LWX | 18 min |
| Aug 9, 10:20 AM EDT | Areal Flood Warning | LWX | 6 hr |
| Aug 9, 10:23 AM EDT | Areal Flood Warning | LWX | 3 hr |
| Aug 9, 10:26 AM EDT | Mesoscale Discussion | SPC | 94 min |
| 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 27, 2:36 PM EDT | Heat Advisory | LWX | 28 hr |
| Aug 29, 3:54 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 29, 5:40 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 14, 5:37 AM EDT | Dense Fog Advisory | LWX | 3 hr |
| Sep 22, 1:07 AM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Sep 22, 1:37 AM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Sep 22, 2:08 AM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| 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 | 17 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 27 |
| Special Weather Statement | 4 |
| Flooding | |
| Areal Flood Warning | 5 |
| Flash Flood Warning | 3 |
| Flood Watch | 6 |
| Winter | |
| Winter Storm Warning | 4 |
| Winter Storm Watch | 3 |
| Winter Weather Advisory | 5 |
| Heat | |
| Excessive Heat Watch | 3 |
| Heat Advisory | 12 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 9 |
| Wind and dust | |
| Wind Advisory | 9 |
| Fire | |
| Red Flag Warning | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 8 |
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.