Alert archive / Maryland / Worcester County
Weather alerts in Worcester County, Maryland, 2009
141 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Worcester County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 141
- Warnings
- 24
- Watches
- 22
- Advisories
- 48
- Busiest month
- August21 alerts
- Busiest day
- August 2, 20095 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
0 of 2 tornado warnings covering Worcester County in 2009 had a tornado report inside them.
Worcester County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 2 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 13 | 5 | 62% | 7 | 57% | 25 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 21 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Wakefield, VA: tornado warnings | 35 | 3 | 91% | 9 | 44% | 10 min |
| NWS Wakefield, VA: severe thunderstorm warnings | 290 | 137 | 53% | 332 | 80% | 19 min |
| NWS Wakefield, VA: flash flood warnings | 19 | 14 | 26% | 21 | 81% | 40 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 7, 12:24 AM EST | Dense Fog Advisory | AKQ | 7 hr |
| Jan 15, 3:48 PM EST | Wind Chill Advisory | AKQ | 18 hr |
| Jan 19, 5:00 AM EST | Dense Fog Advisory | AKQ | 5 hr |
| Jan 26, 9:44 PM EST | Winter Weather Advisory | AKQ | 31 hr |
| Feb 11, 3:14 PM EST | Fire Weather Watch | AKQ | 14 hr |
| Feb 11, 3:27 PM EST | Wind Advisory | AKQ | 26 hr |
| Feb 12, 5:17 AM EST | Red Flag Warning | AKQ | 16 hr |
| Mar 1, 4:06 AM EST | Winter Storm Warning | AKQ | 31 hr |
| Mar 1, 3:44 PM EST | Winter Weather Advisory | AKQ | 19 hr |
| Apr 6, 10:45 AM EDT | Severe Thunderstorm Warning | AKQ | 45 min |
| Apr 16, 3:46 PM EDT | Frost Advisory | AKQ | 16 hr |
| Apr 20, 6:58 PM EDT | Areal Flood Advisory | AKQ | 3 hr |
| Apr 22, 4:30 PM EDT | Severe Thunderstorm Warning | AKQ | 34 min |
| Apr 23, 3:22 PM EDT | Frost Advisory | AKQ | 17 hr |
| Apr 26, 2:06 AM EDT | Severe Thunderstorm Warning | AKQ | 54 min |
| May 4, 2:29 PM EDT | Severe Thunderstorm Warning | AKQ | 46 min |
| May 6, 8:26 PM EDT | Tornado Watch | SPC | 8 hr |
| May 9, 5:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| May 9, 6:25 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 9, 7:20 PM EDT | Severe Thunderstorm Warning | AKQ | 55 min |
| May 26, 4:22 PM EDT | Coastal Flood Advisory | AKQ | 10 hr |
| May 29, 1:26 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 7:41 PM EDT | Severe Thunderstorm Warning | AKQ | 49 min |
| May 29, 7:51 PM EDT | Severe Thunderstorm Warning | AKQ | 54 min |
| May 29, 8:06 PM EDT | Severe Thunderstorm Warning | AKQ | 24 min |
| Jun 2, 1:58 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 3, 1:06 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 3, 4:34 PM EDT | Mesoscale Discussion | SPC | 86 min |
| Jun 3, 5:46 PM EDT | Severe Thunderstorm Warning | AKQ | 44 min |
| Jun 3, 7:10 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Jun 5, 1:49 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Jun 7, 9:21 PM EDT | Dense Fog Advisory | AKQ | 11 hr |
| Jun 9, 6:01 AM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 9, 7:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 18, 11:49 AM EDT | Coastal Flood Statement | AKQ | 6 hr |
| Jun 18, 2:21 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Jun 19, 2:11 PM EDT | Coastal Flood Statement | AKQ | 7 hr |
| Jun 20, 3:05 PM EDT | Tornado Watch | SPC | 5 hr |
| Jun 20, 7:05 PM EDT | Severe Thunderstorm Warning | AKQ | 25 min |
| Jun 20, 7:08 PM EDT | Tornado Warning | AKQ | 22 min |
| Jun 21, 5:30 AM EDT | Coastal Flood Watch | AKQ | 29 hr |
| Jun 21, 3:28 PM EDT | Coastal Flood Advisory | AKQ | 7 hr |
| Jun 22, 10:45 AM EDT | Coastal Flood Advisory | AKQ | 13 hr |
| Jun 23, 4:35 AM EDT | Coastal Flood Advisory | AKQ | 20 hr |
| Jun 25, 5:36 AM EDT | Coastal Flood Statement | AKQ | 63 hr |
| Jul 9, 8:51 AM EDT | Coastal Flood Statement | AKQ | 60 hr |
| Jul 12, 12:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 16, 5:38 PM EDT | Coastal Flood Statement | AKQ | 29 hr |
| Jul 19, 5:04 AM EDT | Coastal Flood Statement | AKQ | 16 hr |
| Jul 19, 5:12 PM EDT | Coastal Flood Statement | AKQ | 28 hr |
| Jul 21, 1:54 AM EDT | Coastal Flood Statement | AKQ | 19 hr |
| Jul 22, 5:48 PM EDT | Coastal Flood Statement | AKQ | 28 hr |
| Jul 23, 11:02 PM EDT | Coastal Flood Statement | AKQ | 19 hr |
| Jul 24, 5:57 PM EDT | Coastal Flood Statement | AKQ | 3 days |
| Jul 26, 2:07 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jul 26, 4:16 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 26, 8:21 PM EDT | Mesoscale Discussion | SPC | 54 min |
| Jul 27, 3:32 PM EDT | Severe Thunderstorm Warning | AKQ | 41 min |
| Jul 29, 1:32 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jul 29, 4:43 PM EDT | Severe Thunderstorm Warning | AKQ | 23 min |
| Jul 31, 2:25 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jul 31, 4:27 PM EDT | Severe Thunderstorm Warning | AKQ | 48 min |
| Jul 31, 4:57 PM EDT | Tornado Warning | AKQ | 27 min |
| Jul 31, 6:54 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 2, 11:33 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 2, 3:03 PM EDT | Areal Flood Advisory | AKQ | 87 min |
| Aug 2, 3:39 PM EDT | Flash Flood Warning | AKQ | 2 hr |
| Aug 2, 7:15 PM EDT | Areal Flood Advisory | AKQ | 60 min |
| Aug 2, 7:40 PM EDT | Flash Flood Warning | AKQ | 89 min |
| Aug 9, 3:17 PM EDT | Heat Advisory | AKQ | 29 hr |
| Aug 12, 1:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 12, 7:37 PM EDT | Areal Flood Advisory | AKQ | 113 min |
| Aug 19, 6:05 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Aug 20, 5:21 PM EDT | Coastal Flood Statement | AKQ | 59 hr |
| Aug 21, 12:36 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Aug 21, 4:05 PM EDT | High Surf Advisory | AKQ | 37 hr |
| Aug 22, 11:17 AM EDT | Areal Flood Advisory | AKQ | 118 min |
| Aug 22, 1:01 PM EDT | Areal Flood Advisory | AKQ | 119 min |
| Aug 22, 1:58 PM EDT | Flash Flood Watch | AKQ | 7 hr |
| Aug 22, 2:11 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 23, 8:08 AM EDT | Coastal Flood Statement | AKQ | 60 hr |
| Aug 27, 1:51 PM EDT | Coastal Flood Statement | AKQ | 3 hr |
| Aug 27, 5:04 PM EDT | Coastal Flood Statement | AKQ | 72 hr |
| Aug 28, 12:24 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 30, 6:47 PM EDT | Coastal Flood Statement | AKQ | 49 hr |
| Sep 1, 4:41 PM EDT | Coastal Flood Statement | AKQ | 27 hr |
| Sep 2, 10:32 PM EDT | Coastal Flood Statement | AKQ | 21 hr |
| Sep 3, 8:12 PM EDT | Coastal Flood Statement | AKQ | 24 hr |
| Sep 4, 8:04 PM EDT | Coastal Flood Statement | AKQ | 24 hr |
| Sep 5, 8:31 PM EDT | Coastal Flood Statement | AKQ | 47 hr |
| Sep 7, 8:10 PM EDT | Coastal Flood Statement | AKQ | 20 hr |
| Sep 8, 4:23 PM EDT | Coastal Flood Advisory | AKQ | 58 hr |
| Sep 9, 4:27 PM EDT | High Surf Advisory | AKQ | 34 hr |
| Sep 10, 10:41 AM EDT | Wind Advisory | AKQ | 9 hr |
| Sep 10, 11:01 AM EDT | Coastal Flood Statement | AKQ | 57 hr |
| Sep 10, 9:26 PM EDT | Areal Flood Advisory | AKQ | 109 min |
| Sep 11, 2:12 AM EDT | High Surf Advisory | AKQ | 8 hr |
| Sep 16, 2:39 AM EDT | Coastal Flood Advisory | AKQ | 42 hr |
| Sep 17, 9:02 PM EDT | Coastal Flood Statement | AKQ | 47 hr |
| Sep 19, 10:30 PM EDT | Coastal Flood Statement | AKQ | 70 hr |
| Sep 22, 9:06 PM EDT | Coastal Flood Statement | AKQ | 23 hr |
| Sep 24, 5:13 PM EDT | Coastal Flood Statement | AKQ | 25 hr |
| Sep 25, 6:35 PM EDT | Coastal Flood Statement | AKQ | 25 hr |
| Sep 26, 8:00 PM EDT | Coastal Flood Statement | AKQ | 24 hr |
| Oct 4, 2:42 AM EDT | Dense Fog Advisory | AKQ | 5 hr |
| Oct 14, 3:51 PM EDT | Coastal Flood Watch | AKQ | 23 hr |
| Oct 15, 2:36 PM EDT | Coastal Flood Warning | AKQ | 67 hr |
| Oct 15, 2:36 PM EDT | Coastal Flood Advisory | AKQ | 4 days |
| Oct 15, 7:44 PM EDT | High Surf Advisory | AKQ | 34 hr |
| Oct 17, 10:31 PM EDT | High Surf Advisory | AKQ | 11 hr |
| Oct 18, 10:17 AM EDT | High Surf Advisory | AKQ | 12 hr |
| Oct 19, 3:59 PM EDT | Frost Advisory | AKQ | 16 hr |
| Oct 24, 12:19 PM EDT | Mesoscale Discussion | SPC | 116 min |
| Oct 29, 11:00 AM EDT | Coastal Flood Statement | AKQ | 9 hr |
| Nov 1, 7:03 PM EST | Coastal Flood Advisory | AKQ | 15 hr |
| Nov 2, 4:10 PM EST | Coastal Flood Advisory | AKQ | 18 hr |
| Nov 6, 3:41 AM EST | Freeze Watch | AKQ | 9 hr |
| Nov 6, 3:41 AM EST | Freeze Warning | AKQ | 28 hr |
| Nov 10, 4:08 AM EST | Coastal Flood Watch | AKQ | 25 hr |
| Nov 10, 3:36 PM EST | Flood Watch | AKQ | 60 hr |
| Nov 11, 3:57 AM EST | High Wind Warning | AKQ | 56 hr |
| Nov 11, 3:57 AM EST | Wind Advisory | AKQ | 62 hr |
| Nov 11, 4:46 AM EST | Coastal Flood Warning | AKQ | 3 days |
| Nov 11, 4:46 AM EST | High Surf Advisory | AKQ | 71 hr |
| Nov 14, 5:13 AM EST | High Surf Advisory | AKQ | 5 hr |
| Nov 14, 10:27 AM EST | Coastal Flood Advisory | AKQ | 31 hr |
| Nov 26, 12:03 AM EST | Dense Fog Advisory | AKQ | 9 hr |
| Dec 2, 4:33 AM EST | High Surf Advisory | AKQ | 21 hr |
| Dec 2, 4:40 AM EST | Wind Advisory | AKQ | 16 hr |
| Dec 2, 9:01 PM EST | Tornado Watch | SPC | 6 hr |
| Dec 3, 12:12 AM EST | Mesoscale Discussion | SPC | 93 min |
| Dec 8, 7:57 AM EST | Flood Watch | AKQ | 23 hr |
| Dec 9, 3:08 PM EST | Wind Advisory | AKQ | 6 hr |
| Dec 13, 10:24 PM EST | Dense Fog Advisory | AKQ | 12 hr |
| Dec 17, 3:21 PM EST | Coastal Flood Watch | AKQ | 24 hr |
| Dec 17, 3:53 PM EST | Winter Storm Watch | AKQ | 20 hr |
| Dec 18, 4:03 AM EST | High Surf Advisory | AKQ | 58 hr |
| Dec 18, 12:13 PM EST | Winter Weather Advisory | AKQ | 40 hr |
| Dec 18, 3:05 PM EST | Coastal Flood Warning | AKQ | 24 hr |
| Dec 20, 3:24 AM EST | Coastal Flood Advisory | AKQ | 11 hr |
| Dec 28, 3:19 PM EST | Wind Advisory | AKQ | 24 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 | 13 |
| Tornado Warning | 2 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 17 |
| Flooding | |
| Flash Flood Warning | 2 |
| Flash Flood Watch | 1 |
| Flood Watch | 2 |
| Areal Flood Advisory | 7 |
| Winter | |
| Winter Storm Warning | 1 |
| Winter Storm Watch | 1 |
| Winter Weather Advisory | 3 |
| Heat | |
| Heat Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 6 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 6 |
| Coast and beach | |
| Coastal Flood Warning | 3 |
| Coastal Flood Watch | 4 |
| Coastal Flood Advisory | 11 |
| High Surf Advisory | 10 |
| Coastal Flood Statement | 30 |
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20082010
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.