Alert archive / Georgia / Chatham County
Weather alerts in Chatham County, Georgia, 2009
149 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
Chatham County and its neighbors
Each county as a circle sized by its count in 2009. Tap one for its archive.
- Alerts
- 149
- Warnings
- 60
- Watches
- 18
- Advisories
- 31
- Busiest month
- May25 alerts
- Busiest day
- August 12, 20099 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 6 tornado warnings covering Chatham County in 2009 had a tornado report inside them.
Chatham County, 2009
| Warnings | With a report | False alarm ratio | Reports | Inside a warning | Mean lead time | |
|---|---|---|---|---|---|---|
| Tornado warnings | 6 | 0 | 100% | 0 | ||
| Severe thunderstorm warnings | 49 | 30 | 39% | 30 | 83% | 23 min |
| Flash flood warnings | 3 | 3 | 0% | 5 | 80% | 43 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 7, 4:29 AM EST | Mesoscale Discussion | SPC | 91 min |
| 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 19, 2:44 AM EST | Tornado Watch | SPC | 3 hr |
| Feb 19, 4:19 AM EST | Mesoscale Discussion | SPC | 56 min |
| Feb 28, 11:39 AM EST | Tornado Watch | SPC | 7 hr |
| Feb 28, 1:50 PM EST | Mesoscale Discussion | SPC | 85 min |
| Feb 28, 6:43 PM EST | Tornado Watch | SPC | 8 hr |
| Feb 28, 9:48 PM EST | Mesoscale Discussion | SPC | 57 min |
| Mar 1, 1:55 AM EST | Mesoscale Discussion | SPC | 95 min |
| Mar 1, 2:41 AM EST | Tornado Watch | SPC | 7 hr |
| Mar 1, 2:54 AM EST | Severe Thunderstorm Warning | CHS | 66 min |
| Mar 1, 3:10 AM EST | Tornado Warning | CHS | 38 min |
| Mar 1, 4:21 AM EST | Severe Thunderstorm Warning | CHS | 39 min |
| Mar 1, 6:17 AM EST | Mesoscale Discussion | SPC | 118 min |
| Mar 1, 8:18 AM EST | Mesoscale Discussion | SPC | 87 min |
| 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, 4:01 PM EDT | Tornado Warning | CHS | 29 min |
| Mar 28, 5:40 PM EDT | Severe Thunderstorm Warning | CHS | 50 min |
| Mar 28, 5:43 PM EDT | Tornado Warning | CHS | 47 min |
| Mar 28, 6:06 PM EDT | Areal Flood Advisory | CHS | 114 min |
| Mar 28, 8:03 PM EDT | Areal Flood Advisory | CHS | 3 hr |
| Mar 29, 12:48 AM EDT | Mesoscale Discussion | SPC | 87 min |
| Apr 2, 2:08 PM EDT | Areal Flood Advisory | CHS | 3 hr |
| Apr 13, 12:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Apr 13, 12:32 PM EDT | Tornado Watch | SPC | 6 hr |
| Apr 13, 4:07 PM EDT | Severe Thunderstorm Warning | CHS | 53 min |
| Apr 13, 4:14 PM EDT | Tornado Warning | CHS | 46 min |
| Apr 13, 4:42 PM EDT | Severe Thunderstorm Warning | CHS | 63 min |
| Apr 13, 4:56 PM EDT | Severe Thunderstorm Warning | CHS | 64 min |
| Apr 13, 5:32 PM EDT | Areal Flood Advisory | CHS | 88 min |
| Apr 20, 2:52 PM EDT | Mesoscale Discussion | SPC | 83 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, 11:38 AM EDT | Mesoscale Discussion | SPC | 67 min |
| May 4, 1:02 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
| May 5, 10:18 AM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 5, 2:03 PM EDT | Mesoscale Discussion | SPC | 87 min |
| May 5, 4:41 PM EDT | Severe Thunderstorm Warning | CHS | 64 min |
| May 5, 5:37 PM EDT | Mesoscale Discussion | SPC | 53 min |
| May 6, 4:50 PM EDT | Severe Thunderstorm Warning | CHS | 55 min |
| May 11, 3:46 PM EDT | Mesoscale Discussion | SPC | 59 min |
| May 11, 4:00 PM EDT | Severe Thunderstorm Warning | CHS | 45 min |
| May 11, 4:18 PM EDT | Severe Thunderstorm Warning | CHS | 57 min |
| May 11, 4:19 PM EDT | Severe Thunderstorm Warning | CHS | 41 min |
| May 11, 4:30 PM EDT | Severe Thunderstorm Warning | CHS | 60 min |
| May 11, 5:03 PM EDT | Severe Thunderstorm Warning | CHS | 57 min |
| May 11, 5:28 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| May 14, 11:02 PM EDT | Areal Flood Advisory | CHS | 88 min |
| May 15, 8:40 AM EDT | Areal Flood Advisory | CHS | 95 min |
| May 15, 10:30 AM EDT | Areal Flood Advisory | CHS | 90 min |
| May 17, 2:30 PM EDT | Severe Thunderstorm Warning | CHS | 31 min |
| May 17, 4:00 PM EDT | Areal Flood Advisory | CHS | 2 hr |
| May 21, 8:14 AM EDT | Areal Flood Advisory | CHS | 3 hr |
| May 21, 6:53 PM EDT | Areal Flood Advisory | CHS | 3 hr |
| May 23, 7:13 AM EDT | Areal Flood Advisory | CHS | 92 min |
| May 23, 8:45 AM EDT | Areal Flood Advisory | CHS | 90 min |
| May 29, 2:41 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
| May 29, 6:01 PM EDT | Mesoscale Discussion | SPC | 59 min |
| Jun 4, 4:21 PM EDT | Severe Thunderstorm Warning | CHS | 39 min |
| Jun 4, 4:47 PM EDT | Severe Thunderstorm Warning | CHS | 43 min |
| Jun 11, 5:58 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jun 11, 8:28 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| Jun 11, 9:56 PM EDT | Severe Thunderstorm Warning | CHS | 49 min |
| Jun 12, 4:49 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 12, 8:20 PM EDT | Mesoscale Discussion | SPC | 55 min |
| Jun 13, 1:34 AM EDT | Severe Thunderstorm Warning | CHS | 41 min |
| Jun 16, 1:39 PM EDT | Mesoscale Discussion | SPC | 96 min |
| Jun 16, 7:32 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| Jun 16, 7:56 PM EDT | Severe Thunderstorm Warning | CHS | 42 min |
| Jun 16, 8:13 PM EDT | Severe Thunderstorm Warning | CHS | 62 min |
| Jun 18, 1:21 AM EDT | Mesoscale Discussion | SPC | 24 min |
| Jun 18, 1:39 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jun 18, 3:45 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Jun 18, 5:16 AM EDT | Severe Thunderstorm Warning | CHS | 44 min |
| Jun 18, 6:02 PM EDT | Mesoscale Discussion | SPC | 28 min |
| Jun 18, 6:22 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Jun 18, 8:06 PM EDT | Severe Thunderstorm Warning | CHS | 54 min |
| Jun 26, 4:35 PM EDT | Severe Thunderstorm Warning | CHS | 40 min |
| Jun 26, 4:46 PM EDT | Severe Thunderstorm Warning | CHS | 44 min |
| Jun 26, 5:11 PM EDT | Severe Thunderstorm Warning | CHS | 49 min |
| Jun 26, 5:58 PM EDT | Severe Thunderstorm Warning | CHS | 47 min |
| Jun 28, 7:05 PM EDT | Mesoscale Discussion | SPC | 115 min |
| Jun 29, 5:10 PM EDT | Severe Thunderstorm Warning | CHS | 37 min |
| Jul 2, 2:33 PM EDT | Mesoscale Discussion | SPC | 87 min |
| Jul 7, 3:36 PM EDT | Areal Flood Advisory | CHS | 84 min |
| Jul 7, 6:13 PM EDT | Mesoscale Discussion | SPC | 62 min |
| Jul 7, 6:33 PM EDT | Areal Flood Advisory | CHS | 66 min |
| Jul 10, 10:48 AM EDT | Areal Flood Advisory | CHS | 87 min |
| Jul 10, 2:42 PM EDT | Areal Flood Advisory | CHS | 3 hr |
| Jul 20, 5:08 PM EDT | Severe Thunderstorm Warning | CHS | 33 min |
| Jul 27, 6:04 PM EDT | Severe Thunderstorm Warning | CHS | 56 min |
| Jul 27, 6:27 PM EDT | Areal Flood Advisory | CHS | 2 hr |
| Jul 27, 7:00 PM EDT | Severe Thunderstorm Warning | CHS | 43 min |
| Jul 27, 7:20 PM EDT | Flash Flood Warning | CHS | 87 min |
| Jul 29, 5:20 PM EDT | Severe Thunderstorm Warning | CHS | 40 min |
| Jul 30, 7:31 PM EDT | Severe Thunderstorm Warning | CHS | 59 min |
| Jul 30, 8:27 PM EDT | Severe Thunderstorm Warning | CHS | 47 min |
| Jul 31, 5:30 PM EDT | Severe Thunderstorm Warning | CHS | 60 min |
| Jul 31, 5:44 PM EDT | Areal Flood Advisory | CHS | 34 min |
| Aug 3, 5:46 PM EDT | Areal Flood Advisory | CHS | 89 min |
| Aug 3, 6:13 PM EDT | Flash Flood Warning | CHS | 3 hr |
| Aug 5, 3:17 PM EDT | Severe Thunderstorm Warning | CHS | 35 min |
| Aug 8, 2:33 PM EDT | Areal Flood Advisory | CHS | 57 min |
| Aug 12, 11:25 AM EDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 12, 12:23 PM EDT | Severe Thunderstorm Watch | SPC | 9 hr |
| Aug 12, 2:09 PM EDT | Severe Thunderstorm Warning | CHS | 66 min |
| Aug 12, 4:13 PM EDT | Mesoscale Discussion | SPC | 92 min |
| Aug 12, 4:21 PM EDT | Severe Thunderstorm Warning | CHS | 54 min |
| Aug 12, 5:07 PM EDT | Areal Flood Advisory | CHS | 113 min |
| Aug 12, 5:11 PM EDT | Severe Thunderstorm Warning | CHS | 48 min |
| Aug 12, 6:17 PM EDT | Areal Flood Advisory | CHS | 118 min |
| Aug 12, 6:30 PM EDT | Flash Flood Warning | CHS | 64 min |
| Aug 13, 6:07 PM EDT | Areal Flood Advisory | CHS | 83 min |
| Aug 15, 1:40 PM EDT | Areal Flood Advisory | CHS | 42 min |
| Aug 15, 3:09 PM EDT | Areal Flood Advisory | CHS | 52 min |
| Aug 21, 5:30 PM EDT | Severe Thunderstorm Warning | CHS | 60 min |
| Aug 21, 5:42 PM EDT | Areal Flood Advisory | CHS | 93 min |
| Aug 21, 6:03 PM EDT | Severe Thunderstorm Warning | CHS | 37 min |
| Aug 28, 1:24 PM EDT | Mesoscale Discussion | SPC | 66 min |
| Aug 31, 5:56 PM EDT | Areal Flood Advisory | CHS | 94 min |
| Aug 31, 7:32 PM EDT | Areal Flood Advisory | CHS | 58 min |
| Aug 31, 8:29 PM EDT | Areal Flood Advisory | CHS | 91 min |
| Sep 18, 1:19 PM EDT | Areal Flood Advisory | CHS | 41 min |
| Oct 12, 3:15 PM EDT | Mesoscale Discussion | SPC | 90 min |
| Oct 27, 3:43 PM EDT | Mesoscale Discussion | SPC | 2 hr |
| Oct 27, 6:53 PM EDT | Severe Thunderstorm Warning | CHS | 52 min |
| Oct 27, 6:56 PM EDT | Mesoscale Discussion | SPC | 94 min |
| Oct 27, 7:08 PM EDT | Tornado Watch | SPC | 3 hr |
| Oct 27, 7:17 PM EDT | Severe Thunderstorm Warning | CHS | 58 min |
| Oct 27, 7:33 PM EDT | Tornado Warning | CHS | 42 min |
| Nov 24, 10:21 AM EST | River Flood Warning | CHS | 5 days |
| Dec 2, 2:08 PM EST | Tornado Watch | SPC | 8 hr |
| Dec 2, 4:33 PM EST | Severe Thunderstorm Warning | CHS | 57 min |
| Dec 2, 5:44 PM EST | Mesoscale Discussion | SPC | 91 min |
| Dec 2, 6:29 PM EST | Severe Thunderstorm Warning | CHS | 61 min |
| Dec 9, 1:42 PM EST | Tornado Warning | CHS | 33 min |
| Dec 9, 2:24 PM EST | Severe Thunderstorm Warning | CHS | 36 min |
| Dec 9, 2:46 PM EST | Severe Thunderstorm Warning | CHS | 29 min |
| Dec 12, 10:28 PM EST | River Flood Warning | CHS | 6 days |
| Dec 18, 2:35 PM EST | Areal Flood Advisory | CHS | 66 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 |
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 | 49 |
| Tornado Warning | 6 |
| Severe Thunderstorm Watch | 9 |
| Tornado Watch | 9 |
| Mesoscale Discussion | 40 |
| Flooding | |
| Flash Flood Warning | 3 |
| River Flood Warning | 2 |
| Areal Flood Advisory | 31 |
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.