Alert archive / Maryland / Carroll County
Weather alerts in Carroll County, Maryland, 2010
199 weather alerts in 2010, 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 2010. Tap one for its archive.
- Alerts
- 199
- Warnings
- 59
- Watches
- 37
- Advisories
- 34
- Busiest month
- April26 alerts
- Busiest day
- April 16, 20109 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 5 tornado warnings covering Carroll County in 2010 had a tornado report inside them.
Carroll County, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 5 | 1 | 80% | 0 | ||
| Severe thunderstorm warnings | 28 | 22 | 21% | 10 | 80% | 26 min |
| Flash flood warnings | 10 | 5 | 50% | 0 |
Each office's whole area, 2010
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 31 | 2 | 94% | 4 | 50% | 17 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 257 | 198 | 23% | 762 | 86% | 21 min |
| NWS Baltimore/Washington: flash flood warnings | 64 | 35 | 45% | 139 | 92% | 166 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 2, 4:15 AM EST | Wind Chill Advisory | LWX | 53 hr |
| Jan 2, 4:21 AM EST | Wind Advisory | LWX | 38 hr |
| Jan 7, 3:48 AM EST | Winter Weather Advisory | LWX | 57 hr |
| Jan 21, 12:55 PM EST | Winter Weather Advisory | LWX | 24 hr |
| Jan 23, 1:08 PM EST | Flash Flood Watch | LWX | 48 hr |
| Jan 24, 6:06 PM EST | Wind Advisory | LWX | 19 hr |
| Jan 25, 9:15 AM EST | Areal Flood Warning | LWX | 10 hr |
| Jan 29, 11:00 AM EST | Winter Weather Advisory | LWX | 38 hr |
| Feb 2, 3:07 AM EST | Winter Weather Advisory | LWX | 26 hr |
| Feb 2, 12:03 PM EST | Winter Storm Warning | LWX | 17 hr |
| Feb 3, 2:45 PM EST | Winter Storm Watch | LWX | 19 hr |
| Feb 4, 9:59 AM EST | Winter Storm Warning | LWX | 55 hr |
| Feb 5, 11:45 AM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 5, 6:58 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 7, 3:15 PM EST | Winter Storm Watch | LWX | 35 hr |
| Feb 8, 3:04 PM EST | Winter Storm Warning | LWX | 46 hr |
| Feb 10, 3:45 AM EST | Blizzard Warning | LWX | 23 hr |
| Feb 10, 7:27 AM EST | Mesoscale Discussion | SPC | 5 hr |
| Feb 10, 12:20 PM EST | Mesoscale Discussion | SPC | 4 hr |
| Feb 15, 3:49 AM EST | Winter Weather Advisory | LWX | 17 hr |
| Feb 23, 5:31 AM EST | Winter Storm Watch | LWX | 55 hr |
| Feb 24, 1:48 PM EST | Winter Weather Advisory | LWX | 15 hr |
| Feb 25, 9:35 AM EST | High Wind Watch | LWX | 6 hr |
| Feb 25, 12:14 PM EST | Winter Weather Advisory | LWX | 30 hr |
| Feb 25, 3:41 PM EST | High Wind Warning | LWX | 26 hr |
| Feb 25, 3:41 PM EST | Wind Advisory | LWX | 24 hr |
| Mar 10, 5:46 AM EST | Flood Watch | LWX | 3 days |
| Mar 13, 11:23 AM EST | Areal Flood Warning | LWX | 10 hr |
| Mar 14, 4:40 AM EDT | Areal Flood Warning | LWX | 4 hr |
| Mar 22, 6:53 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Mar 28, 1:49 PM EDT | Flood Watch | LWX | 14 hr |
| Apr 7, 9:57 AM EDT | Red Flag Warning | LWX | 9 hr |
| Apr 8, 5:30 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Apr 14, 12:00 AM EDT | Dense Fog Advisory | LWX | 10 hr |
| Apr 16, 1:32 PM EDT | Red Flag Warning | LWX | 6 hr |
| Apr 16, 4:17 PM EDT | Special Weather Statement | LWX | 58 min |
| Apr 16, 4:28 PM EDT | Severe Thunderstorm Warning | LWX | 32 min |
| Apr 16, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Apr 16, 4:55 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Apr 16, 6:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Apr 16, 6:16 PM EDT | Special Weather Statement | LWX | 74 min |
| Apr 16, 6:20 PM EDT | Special Weather Statement | LWX | 70 min |
| Apr 16, 6:30 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Apr 16, 8:05 PM EDT | Special Weather Statement | LWX | 70 min |
| Apr 22, 12:37 AM EDT | Dense Fog Advisory | LWX | 8 hr |
| Apr 25, 10:56 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 25, 4:37 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 25, 6:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Apr 25, 7:01 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Apr 25, 7:04 PM EDT | Severe Thunderstorm Warning | LWX | 41 min |
| Apr 25, 7:31 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| Apr 25, 7:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Apr 25, 8:36 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Apr 25, 8:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 25, 9:59 PM EDT | Flash Flood Warning | LWX | 46 min |
| Apr 27, 1:50 PM EDT | Frost Advisory | LWX | 16 hr |
| Apr 28, 2:05 PM EDT | Frost Advisory | LWX | 19 hr |
| May 2, 4:45 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 2, 5:58 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 2, 8:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| May 3, 5:11 AM EDT | Special Weather Statement | LWX | 49 min |
| May 7, 3:24 PM EDT | Wind Advisory | LWX | 29 hr |
| May 8, 12:50 PM EDT | Red Flag Warning | LWX | 7 hr |
| May 14, 11:56 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 14, 2:29 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 14, 6:35 PM EDT | Mesoscale Discussion | SPC | 55 min |
| May 27, 3:20 AM EDT | Flash Flood Watch | LWX | 24 hr |
| May 27, 11:28 AM EDT | Mesoscale Discussion | SPC | 92 min |
| May 27, 1:23 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 27, 4:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 27, 8:08 PM EDT | Mesoscale Discussion | SPC | 97 min |
| May 27, 11:24 PM EDT | Special Weather Statement | LWX | 36 min |
| May 27, 11:57 PM EDT | Special Weather Statement | LWX | 33 min |
| Jun 3, 11:27 AM EDT | Mesoscale Discussion | SPC | 93 min |
| Jun 3, 1:32 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 3, 3:36 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jun 3, 4:23 PM EDT | Severe Thunderstorm Warning | LWX | 52 min |
| Jun 3, 6:28 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 4, 1:09 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 4, 2:39 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 4, 3:48 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Jun 4, 4:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Jun 4, 7:03 PM EDT | Mesoscale Discussion | SPC | 57 min |
| Jun 4, 7:34 PM EDT | Special Weather Statement | LWX | 41 min |
| Jun 4, 7:53 PM EDT | Severe Thunderstorm Warning | LWX | 67 min |
| Jun 6, 11:42 AM EDT | Mesoscale Discussion | SPC | 63 min |
| Jun 6, 12:40 PM EDT | Tornado Watch | SPC | 6 hr |
| Jun 22, 11:35 AM EDT | Mesoscale Discussion | SPC | 25 min |
| Jun 22, 3:48 PM EDT | Mesoscale Discussion | SPC | 27 min |
| Jun 24, 12:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 24, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 24, 2:34 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 28, 12:26 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 1:12 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 3:53 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jul 5, 1:50 PM EDT | Heat Advisory | LWX | 54 hr |
| Jul 5, 7:38 PM EDT | Excessive Heat Watch | LWX | 9 hr |
| Jul 12, 11:13 PM EDT | Special Weather Statement | LWX | 62 min |
| Jul 12, 11:25 PM EDT | Severe Thunderstorm Warning | LWX | 19 min |
| Jul 16, 3:10 AM EDT | Heat Advisory | LWX | 15 hr |
| Jul 19, 4:44 PM EDT | Special Weather Statement | LWX | 31 min |
| Jul 19, 5:02 PM EDT | Special Weather Statement | LWX | 28 min |
| Jul 20, 4:44 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jul 20, 4:59 PM EDT | Tornado Warning | LWX | 31 min |
| Jul 20, 7:54 PM EDT | Severe Thunderstorm Warning | LWX | 51 min |
| Jul 22, 2:06 PM EDT | Excessive Heat Watch | LWX | 31 hr |
| Jul 22, 2:06 PM EDT | Heat Advisory | LWX | 31 hr |
| Jul 23, 9:14 PM EDT | Excessive Heat Warning | LWX | 24 hr |
| Jul 23, 9:14 PM EDT | Heat Advisory | LWX | 47 hr |
| Jul 25, 10:48 AM EDT | Mesoscale Discussion | SPC | 27 min |
| Jul 25, 11:29 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 25, 12:50 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jul 25, 2:29 PM EDT | Severe Thunderstorm Warning | LWX | 61 min |
| Jul 25, 2:36 PM EDT | Severe Thunderstorm Warning | LWX | 54 min |
| Jul 25, 3:25 PM EDT | Mesoscale Discussion | SPC | 65 min |
| Jul 29, 1:10 PM EDT | Severe Thunderstorm Warning | LWX | 50 min |
| Aug 4, 3:07 PM EDT | Heat Advisory | LWX | 29 hr |
| Aug 4, 5:30 PM EDT | Mesoscale Discussion | SPC | 30 min |
| Aug 4, 5:52 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 4, 7:11 PM EDT | Special Weather Statement | LWX | 34 min |
| Aug 4, 7:48 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Aug 4, 7:53 PM EDT | Special Weather Statement | LWX | 37 min |
| Aug 4, 8:00 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Aug 4, 8:46 PM EDT | Severe Thunderstorm Warning | LWX | 59 min |
| Aug 5, 12:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Aug 5, 1:19 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 5, 3:56 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Aug 5, 6:23 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Aug 12, 6:10 AM EDT | Severe Thunderstorm Warning | LWX | 35 min |
| Aug 12, 2:51 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 12, 4:16 PM EDT | Special Weather Statement | LWX | 44 min |
| Aug 12, 4:18 PM EDT | Tornado Warning | LWX | 42 min |
| Aug 12, 4:35 PM EDT | Severe Thunderstorm Warning | LWX | 55 min |
| Aug 12, 4:48 PM EDT | Tornado Warning | LWX | 27 min |
| Aug 12, 5:13 PM EDT | Severe Thunderstorm Warning | LWX | 62 min |
| Aug 12, 5:17 PM EDT | Tornado Warning | LWX | 43 min |
| Aug 12, 9:35 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Aug 12, 10:40 PM EDT | Flash Flood Warning | LWX | 2 hr |
| Aug 16, 2:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 16, 2:13 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 16, 4:25 PM EDT | Special Weather Statement | LWX | 35 min |
| Aug 16, 5:33 PM EDT | Special Weather Statement | LWX | 27 min |
| Sep 7, 2:39 PM EDT | Fire Weather Watch | LWX | 19 hr |
| Sep 8, 9:42 AM EDT | Red Flag Warning | LWX | 9 hr |
| Sep 16, 11:51 PM EDT | Special Weather Statement | LWX | 24 min |
| Sep 22, 2:31 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Sep 22, 2:45 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Sep 22, 4:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Sep 22, 4:48 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Sep 22, 7:14 PM EDT | Mesoscale Discussion | SPC | 61 min |
| Sep 22, 7:29 PM EDT | Special Weather Statement | LWX | 31 min |
| Sep 22, 8:02 PM EDT | Severe Thunderstorm Warning | LWX | 43 min |
| Sep 24, 7:30 AM EDT | Dense Fog Advisory | LWX | 114 min |
| Sep 27, 3:43 AM EDT | Flash Flood Watch | LWX | 28 hr |
| Sep 27, 12:07 PM EDT | Special Weather Statement | LWX | 38 min |
| Sep 27, 12:34 PM EDT | Special Weather Statement | LWX | 41 min |
| Sep 27, 12:38 PM EDT | Tornado Warning | LWX | 26 min |
| Sep 27, 1:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Sep 27, 1:38 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Sep 29, 2:21 AM EDT | Flash Flood Watch | LWX | 50 hr |
| Sep 30, 4:55 AM EDT | Tornado Watch | SPC | 8 hr |
| Sep 30, 6:39 AM EDT | Flash Flood Warning | LWX | 6 hr |
| Sep 30, 8:25 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Sep 30, 12:22 PM EDT | Flash Flood Warning | LWX | 6 hr |
| Sep 30, 4:40 PM EDT | Flash Flood Warning | LWX | 11 hr |
| Sep 30, 6:13 PM EDT | Flash Flood Warning | LWX | 6 hr |
| Oct 1, 12:13 AM EDT | Flash Flood Warning | LWX | 4 hr |
| Oct 22, 2:27 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 26, 7:19 PM EDT | Tornado Watch | SPC | 12 hr |
| Oct 26, 11:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Oct 27, 12:24 AM EDT | Mesoscale Discussion | SPC | 66 min |
| Oct 27, 9:56 PM EDT | Dense Fog Advisory | LWX | 7 hr |
| Oct 29, 3:50 AM EDT | Freeze Watch | LWX | 11 hr |
| Oct 29, 2:28 PM EDT | Freeze Warning | LWX | 19 hr |
| Oct 31, 4:04 AM EDT | Freeze Watch | LWX | 10 hr |
| Oct 31, 1:49 PM EDT | Frost Advisory | LWX | 19 hr |
| Oct 31, 6:10 PM EDT | Freeze Warning | LWX | 15 hr |
| Nov 1, 4:02 AM EDT | Freeze Watch | LWX | 10 hr |
| Nov 1, 1:57 PM EDT | Freeze Warning | LWX | 19 hr |
| Nov 16, 2:19 PM EST | Wind Advisory | LWX | 25 hr |
| Nov 16, 11:52 PM EST | Special Weather Statement | LWX | 23 min |
| Nov 16, 11:59 PM EST | Severe Thunderstorm Warning | LWX | 46 min |
| Nov 17, 12:06 AM EST | Severe Thunderstorm Watch | SPC | 4 hr |
| Nov 17, 12:44 AM EST | Special Weather Statement | LWX | 31 min |
| Nov 17, 1:04 AM EST | Severe Thunderstorm Warning | LWX | 86 min |
| Nov 29, 3:20 PM EST | Flash Flood Watch | LWX | 44 hr |
| Nov 30, 3:12 AM EST | Wind Advisory | LWX | 32 hr |
| Dec 1, 3:48 AM EST | Tornado Watch | SPC | 7 hr |
| Dec 1, 7:51 AM EST | Mesoscale Discussion | SPC | 84 min |
| Dec 1, 8:03 AM EST | Severe Thunderstorm Warning | LWX | 42 min |
| Dec 1, 9:00 AM EST | Severe Thunderstorm Warning | LWX | 75 min |
| Dec 11, 2:13 PM EST | Winter Weather Advisory | LWX | 22 hr |
| Dec 13, 2:09 AM EST | Winter Weather Advisory | LWX | 7 hr |
| Dec 13, 10:28 AM EST | Wind Advisory | LWX | 36 hr |
| Dec 14, 3:52 AM EST | Winter Weather Advisory | LWX | 5 hr |
| Dec 15, 2:21 PM EST | Winter Weather Advisory | LWX | 29 hr |
| Dec 25, 3:09 AM EST | Winter Storm Watch | LWX | 13 hr |
| Dec 25, 3:42 PM EST | Winter Weather Advisory | LWX | 48 hr |
| Dec 26, 2:42 PM EST | Wind Advisory | LWX | 30 hr |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20092011
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.