Alert archive / South Carolina / Colleton County
Weather alerts in Colleton County, South Carolina, 2009
203 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Colleton County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 203
- Warnings
- 74
- Watches
- 29
- Advisories
- 57
- Busiest month
- May44 alerts
- Busiest day
- May 10, 200911 alerts
Over time
By month
Warning verification
How often warnings here had a storm report inside them, and how much warning the reports had.
Colleton County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 0 | 0 | ||||
| Severe thunderstorm warnings | 67 | 36 | 46% | 27 | 70% | 18 min |
| Flash flood warnings | 2 | 2 | 0% | 1 | 100% | 25 min |
Each office's whole area, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| NWS Charleston, SC: tornado warnings | 27 | 4 | 85% | 9 | 78% | 10 min |
| NWS Charleston, SC: severe thunderstorm warnings | 305 | 162 | 47% | 321 | 84% | 20 min |
| NWS Charleston, SC: flash flood warnings | 20 | 14 | 30% | 43 | 91% | 59 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 3, 4:29 AM EST | Dense Fog Advisory | CHS | 3 hr |
| Jan 3, 10:01 PM EST | Dense Fog Advisory | CHS | 13 hr |
| Jan 4, 11:30 PM EST | Dense Fog Advisory | CHS | 11 hr |
| Jan 7, 3:40 AM EST | Wind Advisory | CHS | 15 hr |
| Jan 7, 4:29 AM EST | Mesoscale Discussion | SPC | 91 min |
| Jan 15, 4:03 AM EST | Wind Chill Advisory | CHS | 29 hr |
| Jan 18, 9:25 PM EST | Dense Fog Advisory | CHS | 11 hr |
| Jan 19, 1:57 PM EST | Winter Weather Advisory | CHS | 30 hr |
| Jan 24, 7:22 PM EST | Dense Fog Advisory | CHS | 9 hr |
| Jan 26, 3:38 PM EST | Dense Fog Advisory | CHS | 18 hr |
| Jan 27, 4:37 PM EST | Dense Fog Advisory | CHS | 14 hr |
| Feb 4, 3:43 PM EST | Wind Chill Advisory | CHS | 18 hr |
| Feb 10, 12:23 AM EST | Dense Fog Advisory | CHS | 9 hr |
| Feb 11, 8:18 PM EST | Wind Advisory | CHS | 7 hr |
| Feb 18, 8:02 PM EST | Severe Thunderstorm Watch | SPC | 7 hr |
| Feb 18, 11:55 PM EST | Mesoscale Discussion | SPC | 95 min |
| Feb 19, 2:20 AM EST | Mesoscale Discussion | SPC | 25 min |
| Feb 21, 1:29 PM EST | Fire Weather Watch | CHS | 10 hr |
| Feb 21, 11:50 PM EST | Red Flag Warning | CHS | 18 hr |
| Mar 1, 1:55 AM EST | Mesoscale Discussion | SPC | 95 min |
| Mar 1, 2:41 AM EST | Tornado Watch | SPC | 7 hr |
| Mar 1, 6:17 AM EST | Mesoscale Discussion | SPC | 118 min |
| Mar 1, 7:57 AM EST | Areal Flood Advisory | CHS | 2 hr |
| Mar 1, 8:03 AM EST | Severe Thunderstorm Warning | CHS | 42 min |
| Mar 1, 3:58 PM EST | Winter Weather Advisory | CHS | 5 hr |
| Mar 10, 11:02 PM EDT | Dense Fog Advisory | CHS | 11 hr |
| Mar 14, 3:36 PM EDT | Dense Fog Advisory | CHS | 19 hr |
| Mar 15, 3:59 PM EDT | Dense Fog Advisory | CHS | 17 hr |
| Mar 28, 11:51 AM EDT | Mesoscale Discussion | SPC | 54 min |
| Mar 28, 12:47 PM EDT | Tornado Watch | SPC | 7 hr |
| Mar 28, 3:19 PM EDT | Mesoscale Discussion | SPC | 56 min |
| Mar 28, 3:56 PM EDT | Severe Thunderstorm Warning | CHS | 49 min |
| Mar 28, 4:26 PM EDT | Severe Thunderstorm Warning | CHS | 34 min |
| Mar 28, 4:40 PM EDT | Severe Thunderstorm Warning | CHS | 65 min |
| Mar 28, 4:57 PM EDT | Severe Thunderstorm Warning | CHS | 33 min |
| Mar 28, 6:55 PM EDT | Areal Flood Advisory | CHS | 110 min |
| Mar 29, 12:48 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Mar 29, 2:11 AM EDT | Severe Thunderstorm Warning | CHS | 34 min |
| Apr 2, 11:46 AM EDT | Areal Flood Advisory | CHS | 89 min |
| Apr 3, 4:47 AM EDT | Mesoscale Discussion | SPC | 88 min |
| Apr 4, 11:05 PM EDT | River Flood Warning | CHS | 70 hr |
| Apr 6, 4:02 PM EDT | Freeze Watch | CHS | 24 hr |
| Apr 7, 4:20 AM EDT | Freeze Warning | CHS | 28 hr |
| Apr 10, 11:20 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 11, 1:48 AM EDT | Mesoscale Discussion | SPC | 57 min |
| Apr 13, 12:32 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 14, 11:22 AM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 20, 2:31 PM EDT | Severe Thunderstorm Warning | CHS | 44 min |
| Apr 20, 2:52 PM EDT | Mesoscale Discussion | SPC | 83 min |
| Apr 20, 2:55 PM EDT | Severe Thunderstorm Warning | CHS | 50 min |
| Apr 20, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Apr 20, 4:55 PM EDT | Mesoscale Discussion | SPC | 95 min |
| Apr 20, 7:36 PM EDT | Mesoscale Discussion | SPC | 84 min |
| May 4, 2:23 PM EDT | Mesoscale Discussion | SPC | 67 min |
| May 4, 2:39 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 5:26 PM EDT | Severe Thunderstorm Warning | CHS | 49 min |
| May 4, 5:48 PM EDT | Severe Thunderstorm Warning | CHS | 29 min |
| May 4, 6:15 PM EDT | Mesoscale Discussion | SPC | 60 min |
| May 4, 7:01 PM EDT | Severe Thunderstorm Warning | CHS | 50 min |
| May 4, 7:39 PM EDT | Severe Thunderstorm Watch | SPC | 3 hr |
| May 4, 9:29 PM EDT | Severe Thunderstorm Warning | CHS | 61 min |
| May 5, 9:43 AM EDT | Mesoscale Discussion | SPC | 92 min |
| May 5, 10:18 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 5, 12:15 PM EDT | Areal Flood Advisory | CHS | 90 min |
| May 5, 1:57 PM EDT | Severe Thunderstorm Warning | CHS | 29 min |
| May 5, 2:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 5, 5:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 6, 4:58 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| May 6, 5:25 PM EDT | Severe Thunderstorm Warning | CHS | 41 min |
| May 6, 5:47 PM EDT | Mesoscale Discussion | SPC | 58 min |
| May 8, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| May 10, 1:36 PM EDT | Severe Thunderstorm Warning | CHS | 24 min |
| May 10, 2:52 PM EDT | Severe Thunderstorm Warning | CHS | 38 min |
| May 10, 2:56 PM EDT | Severe Thunderstorm Warning | CHS | 35 min |
| May 10, 3:02 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| May 10, 3:56 PM EDT | Severe Thunderstorm Warning | CHS | 29 min |
| May 10, 3:59 PM EDT | Severe Thunderstorm Warning | CHS | 46 min |
| May 10, 4:38 PM EDT | Severe Thunderstorm Warning | CHS | 37 min |
| May 10, 5:16 PM EDT | Severe Thunderstorm Warning | CHS | 44 min |
| May 10, 5:54 PM EDT | Severe Thunderstorm Warning | CHS | 51 min |
| May 10, 7:04 PM EDT | Severe Thunderstorm Warning | CHS | 56 min |
| May 10, 7:42 PM EDT | Severe Thunderstorm Warning | CHS | 48 min |
| May 11, 9:23 AM EDT | Mesoscale Discussion | SPC | 67 min |
| May 14, 2:37 PM EDT | Areal Flood Advisory | CHS | 83 min |
| May 15, 10:58 AM EDT | Areal Flood Advisory | CHS | 92 min |
| May 15, 11:56 AM EDT | Areal Flood Advisory | CHS | 103 min |
| May 15, 3:01 PM EDT | Areal Flood Advisory | CHS | 59 min |
| May 17, 1:12 PM EDT | Severe Thunderstorm Warning | CHS | 48 min |
| May 17, 3:01 PM EDT | Flash Flood Watch | CHS | 13 hr |
| May 24, 1:52 PM EDT | Areal Flood Advisory | CHS | 60 min |
| May 26, 5:44 AM EDT | Dense Fog Advisory | CHS | 4 hr |
| May 29, 2:22 PM EDT | Mesoscale Discussion | SPC | 23 min |
| May 29, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 4:36 PM EDT | Severe Thunderstorm Warning | CHS | 54 min |
| May 29, 5:17 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| May 29, 5:30 PM EDT | Severe Thunderstorm Warning | CHS | 16 min |
| May 29, 6:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 7, 11:37 AM EDT | Areal Flood Advisory | CHS | 113 min |
| Jun 8, 4:51 AM EDT | Dense Fog Advisory | CHS | 4 hr |
| Jun 9, 5:27 AM EDT | Dense Fog Advisory | CHS | 4 hr |
| Jun 9, 2:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jun 11, 5:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 11, 6:20 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Jun 11, 7:02 PM EDT | Severe Thunderstorm Warning | CHS | 43 min |
| Jun 11, 7:43 PM EDT | Severe Thunderstorm Warning | CHS | 32 min |
| Jun 11, 8:07 PM EDT | Severe Thunderstorm Warning | CHS | 53 min |
| Jun 11, 8:58 PM EDT | Severe Thunderstorm Warning | CHS | 47 min |
| Jun 12, 4:49 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 12, 6:52 PM EDT | Severe Thunderstorm Warning | CHS | 53 min |
| Jun 12, 8:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 15, 1:26 PM EDT | Mesoscale Discussion | SPC | 64 min |
| Jun 15, 3:21 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Jun 15, 4:03 PM EDT | Areal Flood Advisory | CHS | 57 min |
| Jun 16, 1:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 16, 4:07 PM EDT | Severe Thunderstorm Warning | CHS | 53 min |
| Jun 16, 4:32 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| Jun 16, 5:06 PM EDT | Severe Thunderstorm Warning | CHS | 24 min |
| Jun 16, 5:26 PM EDT | Severe Thunderstorm Warning | CHS | 64 min |
| Jun 16, 5:42 PM EDT | Severe Thunderstorm Warning | CHS | 63 min |
| Jun 18, 1:39 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 3:29 AM EDT | Severe Thunderstorm Warning | CHS | 18 min |
| Jun 18, 3:45 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 5:20 AM EDT | Severe Thunderstorm Warning | CHS | 55 min |
| Jun 18, 6:08 AM EDT | Severe Thunderstorm Warning | CHS | 67 min |
| Jun 18, 4:11 PM EDT | Heat Advisory | CHS | 27 hr |
| Jun 18, 6:02 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 18, 6:22 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 19, 3:28 PM EDT | Heat Advisory | CHS | 29 hr |
| Jun 20, 3:10 PM EDT | Heat Advisory | CHS | 29 hr |
| Jun 26, 4:24 PM EDT | Severe Thunderstorm Warning | CHS | 66 min |
| Jun 26, 4:52 PM EDT | Severe Thunderstorm Warning | CHS | 53 min |
| Jun 27, 3:16 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| Jun 28, 4:00 AM EDT | Heat Advisory | CHS | 16 hr |
| Jun 29, 6:08 PM EDT | Severe Thunderstorm Warning | CHS | 67 min |
| Jun 29, 6:28 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| Jul 5, 9:53 PM EDT | Severe Thunderstorm Warning | CHS | 52 min |
| Jul 5, 10:41 PM EDT | Severe Thunderstorm Warning | CHS | 64 min |
| Jul 8, 4:38 AM EDT | Flash Flood Watch | CHS | 39 hr |
| Jul 8, 3:58 PM EDT | Areal Flood Advisory | CHS | 62 min |
| Jul 8, 5:00 PM EDT | Areal Flood Advisory | CHS | 60 min |
| Jul 8, 5:57 PM EDT | Areal Flood Advisory | CHS | 63 min |
| Jul 8, 6:54 PM EDT | Areal Flood Advisory | CHS | 81 min |
| Jul 8, 8:05 PM EDT | Flash Flood Warning | CHS | 115 min |
| Jul 9, 4:06 PM EDT | Areal Flood Advisory | CHS | 54 min |
| Jul 9, 4:57 PM EDT | Areal Flood Advisory | CHS | 63 min |
| Jul 16, 1:31 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Jul 17, 4:28 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Jul 24, 1:02 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| Jul 24, 1:43 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| Jul 27, 2:26 PM EDT | Severe Thunderstorm Warning | CHS | 64 min |
| Jul 27, 3:48 PM EDT | Severe Thunderstorm Warning | CHS | 57 min |
| Jul 29, 4:47 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| Jul 30, 6:26 PM EDT | Severe Thunderstorm Warning | CHS | 40 min |
| Jul 31, 4:49 PM EDT | Severe Thunderstorm Warning | CHS | 56 min |
| Aug 2, 3:37 PM EDT | Severe Thunderstorm Warning | CHS | 38 min |
| Aug 4, 4:53 PM EDT | Severe Thunderstorm Warning | CHS | 67 min |
| Aug 5, 2:30 PM EDT | Severe Thunderstorm Warning | CHS | 60 min |
| Aug 5, 3:47 PM EDT | Severe Thunderstorm Warning | CHS | 43 min |
| Aug 5, 4:24 PM EDT | Severe Thunderstorm Warning | CHS | 46 min |
| Aug 11, 2:01 PM EDT | Mesoscale Discussion | SPC | 89 min |
| Aug 11, 3:58 PM EDT | Severe Thunderstorm Warning | CHS | 38 min |
| Aug 11, 5:07 PM EDT | Severe Thunderstorm Warning | CHS | 53 min |
| Aug 12, 11:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 12:17 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| Aug 12, 12:23 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 12, 1:13 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| Aug 12, 2:49 PM EDT | Severe Thunderstorm Warning | CHS | 56 min |
| Aug 12, 4:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 13, 3:26 AM EDT | Flash Flood Watch | CHS | 36 hr |
| Aug 28, 1:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 28, 5:12 PM EDT | Areal Flood Advisory | CHS | 63 min |
| Aug 28, 5:39 PM EDT | Areal Flood Advisory | CHS | 81 min |
| Aug 30, 1:52 PM EDT | Mesoscale Discussion | SPC | 113 min |
| Aug 31, 11:19 PM EDT | Areal Flood Advisory | CHS | 110 min |
| Oct 18, 3:18 PM EDT | Frost Advisory | CHS | 17 hr |
| Oct 19, 3:28 PM EDT | Frost Advisory | CHS | 18 hr |
| Oct 27, 6:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Oct 27, 7:08 PM EDT | Tornado Watch | SPC | 3 hr |
| Oct 31, 5:19 AM EDT | Dense Fog Advisory | CHS | 4 hr |
| Nov 6, 2:54 AM EST | Frost Advisory | CHS | 29 hr |
| Nov 11, 7:46 AM EST | Areal Flood Advisory | CHS | 119 min |
| Nov 17, 3:42 AM EST | Dense Fog Advisory | CHS | 3 hr |
| Nov 19, 2:29 AM EST | Dense Fog Advisory | CHS | 4 hr |
| Nov 19, 10:34 PM EST | Dense Fog Advisory | CHS | 10 hr |
| Nov 26, 12:21 AM EST | Dense Fog Advisory | CHS | 9 hr |
| Nov 27, 4:02 AM EST | Freeze Warning | CHS | 29 hr |
| Dec 2, 5:55 AM EST | Areal Flood Advisory | CHS | 3 hr |
| Dec 2, 6:54 AM EST | Flash Flood Warning | CHS | 3 hr |
| Dec 2, 1:31 PM EST | Mesoscale Discussion | SPC | 89 min |
| Dec 2, 2:08 PM EST | Tornado Watch | SPC | 8 hr |
| Dec 2, 5:44 PM EST | Mesoscale Discussion | SPC | 91 min |
| Dec 2, 7:46 PM EST | Severe Thunderstorm Warning | CHS | 59 min |
| Dec 9, 4:57 AM EST | Wind Advisory | CHS | 11 hr |
| Dec 9, 6:11 AM EST | Tornado Watch | SPC | 4 hr |
| Dec 13, 9:05 PM EST | Dense Fog Advisory | CHS | 15 hr |
| Dec 14, 8:18 PM EST | Flash Flood Watch | CHS | 14 hr |
| Dec 17, 3:16 PM EST | Flash Flood Watch | CHS | 30 hr |
| Dec 18, 3:01 PM EST | Areal Flood Advisory | CHS | 119 min |
| Dec 25, 4:41 AM EST | Mesoscale Discussion | SPC | 64 min |
| Dec 25, 5:01 AM EST | Tornado Watch | SPC | 9 hr |
| Dec 25, 7:27 AM EST | Mesoscale Discussion | SPC | 93 min |
| Dec 25, 11:39 AM EST | Mesoscale Discussion | SPC | 66 min |
| Dec 26, 11:02 AM EST | River Flood Warning | CHS | 9 days |
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 | 67 |
| Severe Thunderstorm Watch | 15 |
| Tornado Watch | 7 |
| Mesoscale Discussion | 43 |
| Flooding | |
| Flash Flood Warning | 2 |
| River Flood Warning | 2 |
| Flash Flood Watch | 5 |
| Areal Flood Advisory | 23 |
| Winter | |
| Winter Weather Advisory | 2 |
| Heat | |
| Heat Advisory | 4 |
| Cold | |
| Freeze Warning | 2 |
| Freeze Watch | 1 |
| Frost Advisory | 3 |
| Wind Chill Advisory | 2 |
| Wind and dust | |
| Wind Advisory | 3 |
| Fire | |
| Red Flag Warning | 1 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 20 |
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.