Alert archive / Maryland / Calvert County
Weather alerts in Calvert County, Maryland, 2013
146 weather alerts in 2013, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Calvert County and its neighbors
Each county as a circle sized by its count in 2013. Tap one for its archive.
- Alerts
- 146
- Warnings
- 29
- Watches
- 28
- Advisories
- 47
- Busiest month
- June46 alerts
- Busiest day
- June 13, 201310 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
2 of 4 tornado warnings covering Calvert County in 2013 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 25 minutes after it went out.
Calvert County, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 4 | 2 | 50% | 1 | 100% | 25 min |
| Severe thunderstorm warnings | 15 | 12 | 20% | 13 | 46% | 21 min |
| Flash flood warnings | 4 | 3 | 25% | 2 | 100% | 26 min |
Each office's whole area, 2013
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Baltimore/Washington: tornado warnings | 22 | 9 | 59% | 21 | 62% | 11 min |
| NWS Baltimore/Washington: severe thunderstorm warnings | 210 | 141 | 33% | 495 | 74% | 21 min |
| NWS Baltimore/Washington: flash flood warnings | 81 | 51 | 37% | 124 | 78% | 74 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 11, 4:39 PM EST | Dense Fog Advisory | LWX | 19 hr |
| Jan 12, 7:27 PM EST | Dense Fog Advisory | LWX | 18 hr |
| Jan 13, 4:27 PM EST | Dense Fog Advisory | LWX | 13 hr |
| Jan 16, 3:28 AM EST | Winter Storm Watch | LWX | 24 hr |
| Jan 16, 2:50 PM EST | Winter Storm Warning | LWX | 30 hr |
| Jan 17, 3:43 AM EST | Winter Weather Advisory | LWX | 21 hr |
| Jan 23, 3:58 PM EST | Winter Weather Advisory | LWX | 19 hr |
| Jan 24, 7:52 PM EST | Winter Weather Advisory | LWX | 46 hr |
| Jan 27, 4:02 AM EST | Winter Weather Advisory | LWX | 32 hr |
| Jan 29, 2:54 PM EST | Wind Advisory | LWX | 47 hr |
| Jan 29, 2:55 PM EST | Coastal Flood Watch | LWX | 14 hr |
| Jan 30, 4:42 AM EST | Coastal Flood Advisory | LWX | 32 hr |
| Jan 30, 6:31 PM EST | Tornado Watch | SPC | 8 hr |
| Jan 30, 9:38 PM EST | Mesoscale Discussion | SPC | 67 min |
| Jan 31, 1:21 AM EST | Flash Flood Warning | LWX | 3 hr |
| Jan 31, 1:52 AM EST | Severe Thunderstorm Warning | LWX | 53 min |
| Feb 8, 1:26 PM EST | Wind Advisory | LWX | 17 hr |
| Feb 26, 2:43 PM EST | Coastal Flood Advisory | LWX | 21 hr |
| Feb 27, 1:03 PM EST | Coastal Flood Advisory | LWX | 7 hr |
| Mar 4, 3:11 AM EST | Winter Storm Watch | LWX | 36 hr |
| Mar 4, 8:48 PM EST | Winter Storm Warning | LWX | 42 hr |
| Mar 5, 2:48 PM EST | Winter Weather Advisory | LWX | 8 hr |
| Mar 5, 9:12 PM EST | Coastal Flood Advisory | LWX | 17 hr |
| Mar 6, 12:07 PM EST | Winter Weather Advisory | LWX | 2 hr |
| Mar 6, 4:27 PM EST | Wind Advisory | LWX | 4 hr |
| Mar 9, 12:00 PM EST | Coastal Flood Advisory | LWX | 5 hr |
| Mar 9, 2:38 PM EST | Coastal Flood Advisory | LWX | 3 days |
| Mar 11, 10:37 AM EDT | Coastal Flood Watch | LWX | 10 hr |
| Apr 1, 1:25 AM EDT | Dense Fog Advisory | LWX | 8 hr |
| Apr 2, 3:32 PM EDT | Fire Weather Watch | LWX | 13 hr |
| Apr 12, 2:42 PM EDT | Special Weather Statement | LWX | 18 min |
| Apr 19, 1:27 PM EDT | Mesoscale Discussion | SPC | 63 min |
| Apr 19, 2:31 PM EDT | Tornado Watch | SPC | 7 hr |
| Apr 19, 4:36 PM EDT | Mesoscale Discussion | SPC | 114 min |
| Apr 19, 6:05 PM EDT | Coastal Flood Advisory | LWX | 9 hr |
| Apr 19, 6:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Apr 19, 7:00 PM EDT | Severe Thunderstorm Warning | LWX | 45 min |
| Apr 19, 7:18 PM EDT | Severe Thunderstorm Warning | LWX | 42 min |
| Apr 19, 7:22 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Apr 19, 8:00 PM EDT | Severe Thunderstorm Warning | LWX | 30 min |
| Apr 23, 11:22 PM EDT | Coastal Flood Advisory | LWX | 23 hr |
| Apr 25, 12:07 AM EDT | Coastal Flood Advisory | LWX | 5 hr |
| Apr 29, 10:34 PM EDT | Coastal Flood Advisory | LWX | 8 hr |
| May 4, 8:17 PM EDT | Coastal Flood Advisory | LWX | 8 hr |
| May 5, 9:01 PM EDT | Coastal Flood Advisory | LWX | 11 hr |
| May 6, 1:45 PM EDT | Coastal Flood Advisory | LWX | 16 hr |
| May 8, 2:55 PM EDT | Special Weather Statement | LWX | 35 min |
| May 8, 11:27 PM EDT | Dense Fog Advisory | LWX | 9 hr |
| May 11, 1:44 PM EDT | Mesoscale Discussion | SPC | 91 min |
| May 11, 7:11 PM EDT | Mesoscale Discussion | SPC | 64 min |
| May 11, 9:17 PM EDT | Special Weather Statement | LWX | 43 min |
| May 16, 12:04 PM EDT | Mesoscale Discussion | SPC | 56 min |
| May 23, 3:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 28, 4:01 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| May 28, 7:31 PM EDT | Severe Thunderstorm Warning | LWX | 44 min |
| May 28, 7:58 PM EDT | Severe Thunderstorm Warning | LWX | 47 min |
| Jun 2, 3:18 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 6, 2:18 PM EDT | Flash Flood Watch | LWX | 30 hr |
| Jun 6, 5:49 PM EDT | Coastal Flood Advisory | LWX | 17 hr |
| Jun 9, 9:09 PM EDT | Flash Flood Watch | LWX | 26 hr |
| Jun 10, 12:56 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 10, 2:02 PM EDT | Tornado Watch | SPC | 10 hr |
| Jun 10, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 10, 6:49 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 10, 8:33 PM EDT | Tornado Warning | LWX | 27 min |
| Jun 10, 8:41 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 12, 1:50 PM EDT | Flash Flood Watch | LWX | 30 hr |
| Jun 13, 12:14 AM EDT | Severe Thunderstorm Warning | LWX | 31 min |
| Jun 13, 2:40 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 3:58 AM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 13, 5:27 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 13, 8:10 AM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 13, 11:38 AM EDT | Mesoscale Discussion | SPC | 67 min |
| Jun 13, 12:19 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 13, 3:17 PM EDT | Tornado Warning | LWX | 28 min |
| Jun 13, 3:33 PM EDT | Tornado Warning | LWX | 27 min |
| Jun 13, 4:22 PM EDT | Mesoscale Discussion | SPC | 53 min |
| Jun 15, 3:26 AM EDT | Coastal Flood Advisory | LWX | 11 hr |
| Jun 18, 3:54 AM EDT | Flash Flood Watch | LWX | 13 hr |
| Jun 18, 1:58 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jun 18, 4:51 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jun 19, 9:29 PM EDT | Coastal Flood Advisory | LWX | 7 hr |
| Jun 24, 2:44 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 24, 4:43 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 25, 8:46 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 26, 1:19 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 26, 2:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 26, 4:38 PM EDT | Mesoscale Discussion | SPC | 97 min |
| Jun 27, 1:04 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Jun 27, 1:58 PM EDT | Tornado Watch | SPC | 7 hr |
| Jun 28, 2:08 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 3:30 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 28, 3:53 PM EDT | Severe Thunderstorm Warning | LWX | 37 min |
| Jun 28, 4:12 PM EDT | Severe Thunderstorm Warning | LWX | 33 min |
| Jun 28, 4:29 PM EDT | Severe Thunderstorm Warning | LWX | 46 min |
| Jun 28, 4:52 PM EDT | Severe Thunderstorm Warning | LWX | 38 min |
| Jun 28, 5:41 PM EDT | Severe Thunderstorm Warning | LWX | 19 min |
| Jun 28, 6:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Jun 28, 8:00 PM EDT | Tornado Warning | LWX | 45 min |
| Jun 30, 4:11 AM EDT | Flash Flood Watch | LWX | 40 hr |
| Jun 30, 11:48 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 30, 4:44 PM EDT | Flash Flood Warning | LWX | 3 hr |
| Jul 2, 4:12 AM EDT | Flash Flood Watch | LWX | 13 hr |
| Jul 12, 3:46 AM EDT | Flash Flood Watch | LWX | 14 hr |
| Jul 17, 8:41 PM EDT | Heat Advisory | LWX | 22 hr |
| Jul 18, 7:41 PM EDT | Heat Advisory | LWX | 22 hr |
| Jul 19, 9:25 PM EDT | Heat Advisory | LWX | 21 hr |
| Jul 20, 1:07 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jul 20, 8:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| Jul 22, 11:38 PM EDT | Coastal Flood Advisory | LWX | 11 hr |
| Jul 28, 1:34 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jul 28, 6:33 PM EDT | Mesoscale Discussion | SPC | 117 min |
| Aug 6, 2:32 PM EDT | Coastal Flood Advisory | LWX | 21 hr |
| Aug 9, 3:17 PM EDT | Mesoscale Discussion | SPC | 58 min |
| Aug 9, 6:51 PM EDT | Severe Thunderstorm Warning | LWX | 39 min |
| Aug 9, 7:27 PM EDT | Severe Thunderstorm Warning | LWX | 63 min |
| Aug 13, 6:24 AM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 20, 2:49 AM EDT | Dense Fog Advisory | LWX | 7 hr |
| Aug 22, 2:26 PM EDT | Mesoscale Discussion | SPC | 3 hr |
| Aug 30, 10:13 AM EDT | Coastal Flood Advisory | LWX | 22 hr |
| Sep 12, 1:29 PM EDT | Mesoscale Discussion | SPC | 91 min |
| Sep 12, 2:50 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Oct 6, 11:10 AM EDT | Coastal Flood Advisory | LWX | 12 hr |
| Oct 6, 5:41 PM EDT | Coastal Flood Advisory | LWX | 18 hr |
| Oct 7, 8:10 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 7, 8:56 AM EDT | Tornado Watch | SPC | 8 hr |
| Oct 7, 10:36 AM EDT | Mesoscale Discussion | SPC | 114 min |
| Oct 7, 12:01 PM EDT | Coastal Flood Advisory | LWX | 13 hr |
| Oct 7, 12:20 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Oct 9, 4:28 AM EDT | Coastal Flood Advisory | LWX | 47 hr |
| Oct 11, 6:42 AM EDT | Flood Watch | LWX | 23 hr |
| Oct 11, 11:58 AM EDT | Coastal Flood Advisory | LWX | 16 hr |
| Oct 12, 7:55 AM EDT | Coastal Flood Advisory | LWX | 58 hr |
| Oct 17, 11:30 AM EDT | Coastal Flood Advisory | LWX | 12 hr |
| Oct 24, 1:34 PM EDT | Freeze Warning | LWX | 19 hr |
| Oct 25, 11:40 AM EDT | Freeze Warning | LWX | 21 hr |
| Nov 10, 12:27 PM EST | Red Flag Warning | LWX | 5 hr |
| Nov 17, 1:11 AM EST | Dense Fog Advisory | LWX | 8 hr |
| Nov 18, 2:31 AM EST | Mesoscale Discussion | SPC | 89 min |
| Nov 23, 11:05 AM EST | Fire Weather Watch | LWX | 17 hr |
| Nov 24, 3:23 AM EST | Red Flag Warning | LWX | 15 hr |
| Dec 7, 5:55 PM EST | Winter Weather Advisory | LWX | 37 hr |
| Dec 8, 11:05 AM EST | Mesoscale Discussion | SPC | 3 hr |
| Dec 9, 2:29 PM EST | Winter Weather Advisory | LWX | 21 hr |
| Dec 22, 10:00 AM EST | Mesoscale Discussion | SPC | 60 min |
| Dec 22, 3:14 PM EST | Flood Watch | LWX | 17 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 | 15 |
| Tornado Warning | 4 |
| Severe Thunderstorm Watch | 8 |
| Tornado Watch | 5 |
| Mesoscale Discussion | 39 |
| Special Weather Statement | 3 |
| Flooding | |
| Flash Flood Warning | 4 |
| Flash Flood Watch | 7 |
| Flood Watch | 2 |
| Winter | |
| Winter Storm Warning | 2 |
| Winter Storm Watch | 2 |
| Winter Weather Advisory | 8 |
| Heat | |
| Heat Advisory | 3 |
| Cold | |
| Freeze Warning | 2 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 2 |
| Fire Weather Watch | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 7 |
| Coast and beach | |
| Coastal Flood Watch | 2 |
| Coastal Flood Advisory | 26 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20122014
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.