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

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings60100%0
Severe thunderstorm warnings493039%3083%23 min
Flash flood warnings330%580%43 min

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Charleston, SC: tornado warnings27485%978%10 min
NWS Charleston, SC: severe thunderstorm warnings30516247%32184%20 min
NWS Charleston, SC: flash flood warnings201430%4391%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.

IssuedProductOfficeLasted
Jan 7, 4:29 AM ESTMesoscale DiscussionSPC91 min
Feb 18, 8:02 PM ESTSevere Thunderstorm WatchSPC7 hr
Feb 18, 11:55 PM ESTMesoscale DiscussionSPC95 min
Feb 19, 2:20 AM ESTMesoscale DiscussionSPC25 min
Feb 19, 2:44 AM ESTTornado WatchSPC3 hr
Feb 19, 4:19 AM ESTMesoscale DiscussionSPC56 min
Feb 28, 11:39 AM ESTTornado WatchSPC7 hr
Feb 28, 1:50 PM ESTMesoscale DiscussionSPC85 min
Feb 28, 6:43 PM ESTTornado WatchSPC8 hr
Feb 28, 9:48 PM ESTMesoscale DiscussionSPC57 min
Mar 1, 1:55 AM ESTMesoscale DiscussionSPC95 min
Mar 1, 2:41 AM ESTTornado WatchSPC7 hr
Mar 1, 2:54 AM ESTSevere Thunderstorm WarningCHS66 min
Mar 1, 3:10 AM ESTTornado WarningCHS38 min
Mar 1, 4:21 AM ESTSevere Thunderstorm WarningCHS39 min
Mar 1, 6:17 AM ESTMesoscale DiscussionSPC118 min
Mar 1, 8:18 AM ESTMesoscale DiscussionSPC87 min
Mar 28, 11:51 AM EDTMesoscale DiscussionSPC54 min
Mar 28, 12:47 PM EDTTornado WatchSPC7 hr
Mar 28, 3:19 PM EDTMesoscale DiscussionSPC56 min
Mar 28, 4:01 PM EDTTornado WarningCHS29 min
Mar 28, 5:40 PM EDTSevere Thunderstorm WarningCHS50 min
Mar 28, 5:43 PM EDTTornado WarningCHS47 min
Mar 28, 6:06 PM EDTAreal Flood AdvisoryCHS114 min
Mar 28, 8:03 PM EDTAreal Flood AdvisoryCHS3 hr
Mar 29, 12:48 AM EDTMesoscale DiscussionSPC87 min
Apr 2, 2:08 PM EDTAreal Flood AdvisoryCHS3 hr
Apr 13, 12:15 PM EDTMesoscale DiscussionSPC90 min
Apr 13, 12:32 PM EDTTornado WatchSPC6 hr
Apr 13, 4:07 PM EDTSevere Thunderstorm WarningCHS53 min
Apr 13, 4:14 PM EDTTornado WarningCHS46 min
Apr 13, 4:42 PM EDTSevere Thunderstorm WarningCHS63 min
Apr 13, 4:56 PM EDTSevere Thunderstorm WarningCHS64 min
Apr 13, 5:32 PM EDTAreal Flood AdvisoryCHS88 min
Apr 20, 2:52 PM EDTMesoscale DiscussionSPC83 min
Apr 20, 3:16 PM EDTSevere Thunderstorm WatchSPC6 hr
Apr 20, 4:55 PM EDTMesoscale DiscussionSPC95 min
Apr 20, 7:36 PM EDTMesoscale DiscussionSPC84 min
May 4, 11:38 AM EDTMesoscale DiscussionSPC67 min
May 4, 1:02 PM EDTSevere Thunderstorm WatchSPC7 hr
May 5, 10:18 AM EDTSevere Thunderstorm WatchSPC8 hr
May 5, 2:03 PM EDTMesoscale DiscussionSPC87 min
May 5, 4:41 PM EDTSevere Thunderstorm WarningCHS64 min
May 5, 5:37 PM EDTMesoscale DiscussionSPC53 min
May 6, 4:50 PM EDTSevere Thunderstorm WarningCHS55 min
May 11, 3:46 PM EDTMesoscale DiscussionSPC59 min
May 11, 4:00 PM EDTSevere Thunderstorm WarningCHS45 min
May 11, 4:18 PM EDTSevere Thunderstorm WarningCHS57 min
May 11, 4:19 PM EDTSevere Thunderstorm WarningCHS41 min
May 11, 4:30 PM EDTSevere Thunderstorm WarningCHS60 min
May 11, 5:03 PM EDTSevere Thunderstorm WarningCHS57 min
May 11, 5:28 PM EDTSevere Thunderstorm WarningCHS62 min
May 14, 11:02 PM EDTAreal Flood AdvisoryCHS88 min
May 15, 8:40 AM EDTAreal Flood AdvisoryCHS95 min
May 15, 10:30 AM EDTAreal Flood AdvisoryCHS90 min
May 17, 2:30 PM EDTSevere Thunderstorm WarningCHS31 min
May 17, 4:00 PM EDTAreal Flood AdvisoryCHS2 hr
May 21, 8:14 AM EDTAreal Flood AdvisoryCHS3 hr
May 21, 6:53 PM EDTAreal Flood AdvisoryCHS3 hr
May 23, 7:13 AM EDTAreal Flood AdvisoryCHS92 min
May 23, 8:45 AM EDTAreal Flood AdvisoryCHS90 min
May 29, 2:41 PM EDTSevere Thunderstorm WatchSPC8 hr
May 29, 6:01 PM EDTMesoscale DiscussionSPC59 min
Jun 4, 4:21 PM EDTSevere Thunderstorm WarningCHS39 min
Jun 4, 4:47 PM EDTSevere Thunderstorm WarningCHS43 min
Jun 11, 5:58 PM EDTMesoscale DiscussionSPC62 min
Jun 11, 8:28 PM EDTSevere Thunderstorm WarningCHS62 min
Jun 11, 9:56 PM EDTSevere Thunderstorm WarningCHS49 min
Jun 12, 4:49 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 12, 8:20 PM EDTMesoscale DiscussionSPC55 min
Jun 13, 1:34 AM EDTSevere Thunderstorm WarningCHS41 min
Jun 16, 1:39 PM EDTMesoscale DiscussionSPC96 min
Jun 16, 7:32 PM EDTSevere Thunderstorm WarningCHS58 min
Jun 16, 7:56 PM EDTSevere Thunderstorm WarningCHS42 min
Jun 16, 8:13 PM EDTSevere Thunderstorm WarningCHS62 min
Jun 18, 1:21 AM EDTMesoscale DiscussionSPC24 min
Jun 18, 1:39 AM EDTSevere Thunderstorm WatchSPC5 hr
Jun 18, 3:45 AM EDTMesoscale DiscussionSPC2 hr
Jun 18, 5:16 AM EDTSevere Thunderstorm WarningCHS44 min
Jun 18, 6:02 PM EDTMesoscale DiscussionSPC28 min
Jun 18, 6:22 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 8:06 PM EDTSevere Thunderstorm WarningCHS54 min
Jun 26, 4:35 PM EDTSevere Thunderstorm WarningCHS40 min
Jun 26, 4:46 PM EDTSevere Thunderstorm WarningCHS44 min
Jun 26, 5:11 PM EDTSevere Thunderstorm WarningCHS49 min
Jun 26, 5:58 PM EDTSevere Thunderstorm WarningCHS47 min
Jun 28, 7:05 PM EDTMesoscale DiscussionSPC115 min
Jun 29, 5:10 PM EDTSevere Thunderstorm WarningCHS37 min
Jul 2, 2:33 PM EDTMesoscale DiscussionSPC87 min
Jul 7, 3:36 PM EDTAreal Flood AdvisoryCHS84 min
Jul 7, 6:13 PM EDTMesoscale DiscussionSPC62 min
Jul 7, 6:33 PM EDTAreal Flood AdvisoryCHS66 min
Jul 10, 10:48 AM EDTAreal Flood AdvisoryCHS87 min
Jul 10, 2:42 PM EDTAreal Flood AdvisoryCHS3 hr
Jul 20, 5:08 PM EDTSevere Thunderstorm WarningCHS33 min
Jul 27, 6:04 PM EDTSevere Thunderstorm WarningCHS56 min
Jul 27, 6:27 PM EDTAreal Flood AdvisoryCHS2 hr
Jul 27, 7:00 PM EDTSevere Thunderstorm WarningCHS43 min
Jul 27, 7:20 PM EDTFlash Flood WarningCHS87 min
Jul 29, 5:20 PM EDTSevere Thunderstorm WarningCHS40 min
Jul 30, 7:31 PM EDTSevere Thunderstorm WarningCHS59 min
Jul 30, 8:27 PM EDTSevere Thunderstorm WarningCHS47 min
Jul 31, 5:30 PM EDTSevere Thunderstorm WarningCHS60 min
Jul 31, 5:44 PM EDTAreal Flood AdvisoryCHS34 min
Aug 3, 5:46 PM EDTAreal Flood AdvisoryCHS89 min
Aug 3, 6:13 PM EDTFlash Flood WarningCHS3 hr
Aug 5, 3:17 PM EDTSevere Thunderstorm WarningCHS35 min
Aug 8, 2:33 PM EDTAreal Flood AdvisoryCHS57 min
Aug 12, 11:25 AM EDTMesoscale DiscussionSPC2 hr
Aug 12, 12:23 PM EDTSevere Thunderstorm WatchSPC9 hr
Aug 12, 2:09 PM EDTSevere Thunderstorm WarningCHS66 min
Aug 12, 4:13 PM EDTMesoscale DiscussionSPC92 min
Aug 12, 4:21 PM EDTSevere Thunderstorm WarningCHS54 min
Aug 12, 5:07 PM EDTAreal Flood AdvisoryCHS113 min
Aug 12, 5:11 PM EDTSevere Thunderstorm WarningCHS48 min
Aug 12, 6:17 PM EDTAreal Flood AdvisoryCHS118 min
Aug 12, 6:30 PM EDTFlash Flood WarningCHS64 min
Aug 13, 6:07 PM EDTAreal Flood AdvisoryCHS83 min
Aug 15, 1:40 PM EDTAreal Flood AdvisoryCHS42 min
Aug 15, 3:09 PM EDTAreal Flood AdvisoryCHS52 min
Aug 21, 5:30 PM EDTSevere Thunderstorm WarningCHS60 min
Aug 21, 5:42 PM EDTAreal Flood AdvisoryCHS93 min
Aug 21, 6:03 PM EDTSevere Thunderstorm WarningCHS37 min
Aug 28, 1:24 PM EDTMesoscale DiscussionSPC66 min
Aug 31, 5:56 PM EDTAreal Flood AdvisoryCHS94 min
Aug 31, 7:32 PM EDTAreal Flood AdvisoryCHS58 min
Aug 31, 8:29 PM EDTAreal Flood AdvisoryCHS91 min
Sep 18, 1:19 PM EDTAreal Flood AdvisoryCHS41 min
Oct 12, 3:15 PM EDTMesoscale DiscussionSPC90 min
Oct 27, 3:43 PM EDTMesoscale DiscussionSPC2 hr
Oct 27, 6:53 PM EDTSevere Thunderstorm WarningCHS52 min
Oct 27, 6:56 PM EDTMesoscale DiscussionSPC94 min
Oct 27, 7:08 PM EDTTornado WatchSPC3 hr
Oct 27, 7:17 PM EDTSevere Thunderstorm WarningCHS58 min
Oct 27, 7:33 PM EDTTornado WarningCHS42 min
Nov 24, 10:21 AM ESTRiver Flood WarningCHS5 days
Dec 2, 2:08 PM ESTTornado WatchSPC8 hr
Dec 2, 4:33 PM ESTSevere Thunderstorm WarningCHS57 min
Dec 2, 5:44 PM ESTMesoscale DiscussionSPC91 min
Dec 2, 6:29 PM ESTSevere Thunderstorm WarningCHS61 min
Dec 9, 1:42 PM ESTTornado WarningCHS33 min
Dec 9, 2:24 PM ESTSevere Thunderstorm WarningCHS36 min
Dec 9, 2:46 PM ESTSevere Thunderstorm WarningCHS29 min
Dec 12, 10:28 PM ESTRiver Flood WarningCHS6 days
Dec 18, 2:35 PM ESTAreal Flood AdvisoryCHS66 min
Dec 25, 4:41 AM ESTMesoscale DiscussionSPC64 min
Dec 25, 5:01 AM ESTTornado WatchSPC9 hr
Dec 25, 7:27 AM ESTMesoscale DiscussionSPC93 min
Dec 25, 11:39 AM ESTMesoscale DiscussionSPC66 min

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 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.