Alert archive / Georgia / McDuffie County

Weather alerts in McDuffie County, Georgia, 2009

119 weather alerts in 2009, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

McDuffie County and its neighbors

Each county as a circle sized by its count in 2009. Tap one for its archive.

Alerts
119
Warnings
16
Watches
14
Advisories
57
Busiest month
April20 alerts
Busiest day
June 18, 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.

1 of 1 tornado warnings covering McDuffie County in 2009 had a tornado report inside them; 1 of 1 tornado reports fell inside a warning, on average 26 minutes after it went out.

McDuffie County, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings110%1100%26 min
Severe thunderstorm warnings11645%2100%12 min
Flash flood warnings110%0

Each office's whole area, 2009

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Columbia, SC: tornado warnings18383%650%25 min
NWS Columbia, SC: severe thunderstorm warnings19410546%18888%25 min
NWS Columbia, SC: flash flood warnings17947%2181%32 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 3, 2:49 AM ESTDense Fog AdvisoryCAE7 hr
Jan 3, 8:17 PM ESTDense Fog AdvisoryCAE16 hr
Jan 4, 2:39 PM ESTDense Fog AdvisoryCAE20 hr
Jan 6, 3:46 AM ESTLake Wind AdvisoryCAE27 hr
Jan 7, 2:32 AM ESTMesoscale DiscussionSPC118 min
Jan 7, 4:11 AM ESTLake Wind AdvisoryCAE39 hr
Jan 7, 4:11 AM ESTWind AdvisoryCAE16 hr
Jan 18, 9:17 PM ESTDense Fog AdvisoryCAE10 hr
Jan 19, 3:55 AM ESTWinter Weather AdvisoryCAE32 hr
Jan 19, 3:44 PM ESTLake Wind AdvisoryCAE22 hr
Jan 24, 6:55 PM ESTDense Fog AdvisoryCAE7 hr
Jan 26, 7:58 PM ESTDense Fog AdvisoryCAE16 hr
Jan 27, 3:51 PM ESTLake Wind AdvisoryCAE28 hr
Jan 30, 3:03 AM ESTLake Wind AdvisoryCAE16 hr
Feb 2, 3:54 AM ESTLake Wind AdvisoryCAE72 hr
Feb 10, 3:46 PM ESTLake Wind AdvisoryCAE49 hr
Feb 11, 11:25 AM ESTWind AdvisoryCAE17 hr
Feb 11, 7:07 PM ESTMesoscale DiscussionSPC53 min
Feb 18, 1:08 PM ESTLake Wind AdvisoryCAE39 hr
Feb 18, 3:32 PM ESTTornado WatchSPC7 hr
Feb 18, 6:26 PM ESTMesoscale DiscussionSPC94 min
Feb 18, 7:24 PM ESTTornado WarningCAE66 min
Feb 18, 10:14 PM ESTSevere Thunderstorm WatchSPC6 hr
Feb 21, 3:12 PM ESTLake Wind AdvisoryCAE30 hr
Feb 28, 3:47 PM ESTWinter Weather AdvisoryCAE12 hr
Mar 1, 3:57 AM ESTWinter Storm WarningCAE22 hr
Mar 1, 12:19 PM ESTMesoscale DiscussionSPC4 hr
Mar 1, 2:33 PM ESTLake Wind AdvisoryCAE114 min
Mar 1, 3:40 PM ESTMesoscale DiscussionSPC4 hr
Mar 1, 4:27 PM ESTLake Wind AdvisoryCAE18 hr
Mar 1, 9:43 PM ESTWinter Weather AdvisoryCAE5 hr
Mar 16, 3:36 PM EDTDense Fog AdvisoryCAE14 hr
Mar 21, 3:11 AM EDTFrost AdvisoryCAE29 hr
Mar 28, 2:48 PM EDTLake Wind AdvisoryCAE32 hr
Apr 2, 4:12 AM EDTMesoscale DiscussionSPC63 min
Apr 2, 3:17 PM EDTLake Wind AdvisoryCAE29 hr
Apr 5, 3:45 PM EDTLake Wind AdvisoryCAE56 hr
Apr 6, 5:45 PM EDTFreeze WatchCAE10 hr
Apr 7, 3:15 AM EDTFreeze WarningCAE29 hr
Apr 10, 4:01 AM EDTLake Wind AdvisoryCAE29 hr
Apr 10, 6:11 PM EDTMesoscale DiscussionSPC64 min
Apr 10, 6:31 PM EDTTornado WatchSPC7 hr
Apr 10, 7:34 PM EDTMesoscale DiscussionSPC56 min
Apr 10, 8:54 PM EDTMesoscale DiscussionSPC66 min
Apr 10, 9:48 PM EDTSevere Thunderstorm WarningCAE42 min
Apr 10, 10:28 PM EDTMesoscale DiscussionSPC92 min
Apr 13, 4:53 PM EDTWind AdvisoryCAE2 hr
Apr 14, 11:22 AM EDTMesoscale DiscussionSPC83 min
Apr 14, 1:25 PM EDTSevere Thunderstorm WarningCAE50 min
Apr 20, 12:20 AM EDTMesoscale DiscussionSPC55 min
Apr 20, 12:42 AM EDTTornado WatchSPC5 hr
Apr 20, 3:36 AM EDTLake Wind AdvisoryCAE19 hr
Apr 21, 3:18 AM EDTLake Wind AdvisoryCAE19 hr
Apr 22, 4:16 AM EDTLake Wind AdvisoryCAE16 hr
May 2, 2:11 PM EDTMesoscale DiscussionSPC94 min
May 3, 6:36 PM EDTMesoscale DiscussionSPC84 min
May 3, 7:29 PM EDTSevere Thunderstorm WatchSPC2 hr
May 4, 2:23 PM EDTMesoscale DiscussionSPC67 min
May 4, 2:39 PM EDTSevere Thunderstorm WatchSPC5 hr
May 5, 6:28 PM EDTSevere Thunderstorm WarningCAE62 min
May 6, 8:47 AM EDTMesoscale DiscussionSPC88 min
May 6, 5:47 PM EDTMesoscale DiscussionSPC58 min
May 15, 6:04 AM EDTDense Fog AdvisoryCAE3 hr
May 17, 2:56 PM EDTLake Wind AdvisoryCAE3 days
Jun 8, 4:46 AM EDTDense Fog AdvisoryCAE4 hr
Jun 12, 2:08 PM EDTMesoscale DiscussionSPC67 min
Jun 17, 3:17 PM EDTMesoscale DiscussionSPC28 min
Jun 17, 3:31 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 17, 10:32 PM EDTMesoscale DiscussionSPC28 min
Jun 17, 10:52 PM EDTSevere Thunderstorm WatchSPC4 hr
Jun 18, 12:57 AM EDTSevere Thunderstorm WarningCAE48 min
Jun 18, 1:34 AM EDTSevere Thunderstorm WarningCAE41 min
Jun 18, 1:48 PM EDTMesoscale DiscussionSPC57 min
Jun 18, 3:13 PM EDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 4:54 PM EDTMesoscale DiscussionSPC66 min
Jun 18, 6:02 PM EDTMesoscale DiscussionSPC28 min
Jun 18, 6:23 PM EDTSevere Thunderstorm WarningCAE67 min
Jun 22, 3:37 PM EDTMesoscale DiscussionSPC113 min
Jun 27, 2:06 PM EDTMesoscale DiscussionSPC54 min
Jun 27, 3:16 PM EDTSevere Thunderstorm WatchSPC7 hr
Jun 27, 4:43 PM EDTMesoscale DiscussionSPC62 min
Jun 27, 7:27 PM EDTMesoscale DiscussionSPC63 min
Jun 28, 4:07 AM EDTHeat AdvisoryCAE11 hr
Jul 5, 11:03 PM EDTSevere Thunderstorm WarningCAE42 min
Jul 7, 6:13 PM EDTMesoscale DiscussionSPC62 min
Jul 8, 1:24 PM EDTMesoscale DiscussionSPC66 min
Aug 5, 1:20 PM EDTSevere Thunderstorm WarningCAE55 min
Aug 5, 3:54 PM EDTSevere Thunderstorm WarningCAE51 min
Aug 5, 4:24 PM EDTSevere Thunderstorm WarningCAE38 min
Aug 11, 2:01 PM EDTMesoscale DiscussionSPC89 min
Aug 13, 12:11 AM EDTAreal Flood AdvisoryCAE109 min
Aug 13, 12:47 AM EDTFlash Flood WarningCAE3 hr
Aug 30, 1:52 PM EDTMesoscale DiscussionSPC113 min
Sep 28, 3:49 AM EDTLake Wind AdvisoryCAE17 hr
Oct 13, 2:58 PM EDTFlood WatchCAE24 hr
Oct 18, 2:44 PM EDTFrost AdvisoryCAE18 hr
Oct 19, 4:01 AM EDTFrost AdvisoryCAE29 hr
Oct 23, 7:16 AM EDTDense Fog AdvisoryCAE3 hr
Nov 6, 3:24 AM ESTFrost AdvisoryCAE28 hr
Nov 10, 3:29 PM ESTFlood WatchCAE28 hr
Nov 11, 3:09 AM ESTAreal Flood AdvisoryCAE3 hr
Nov 11, 3:46 AM ESTLake Wind AdvisoryCAE43 hr
Nov 17, 4:22 AM ESTDense Fog AdvisoryCAE6 hr
Nov 19, 2:54 AM ESTDense Fog AdvisoryCAE7 hr
Nov 26, 12:22 AM ESTDense Fog AdvisoryCAE12 hr
Nov 26, 3:20 PM ESTLake Wind AdvisoryCAE25 hr
Nov 27, 4:00 AM ESTFreeze WarningCAE29 hr
Dec 1, 3:22 PM ESTLake Wind AdvisoryCAE40 hr
Dec 2, 2:08 PM ESTTornado WatchSPC8 hr
Dec 2, 5:44 PM ESTMesoscale DiscussionSPC91 min
Dec 8, 3:07 PM ESTLake Wind AdvisoryCAE12 hr
Dec 9, 3:21 AM ESTWind AdvisoryCAE15 hr
Dec 9, 3:55 AM ESTDense Fog AdvisoryCAE2 hr
Dec 9, 5:47 AM ESTSevere Thunderstorm WarningCAE73 min
Dec 13, 8:52 AM ESTDense Fog AdvisoryCAE4 hr
Dec 13, 9:13 PM ESTDense Fog AdvisoryCAE13 hr
Dec 18, 3:23 AM ESTLake Wind AdvisoryCAE31 hr
Dec 24, 3:44 PM ESTLake Wind AdvisoryCAE24 hr
Dec 28, 11:28 AM ESTLake Wind AdvisoryCAE15 hr

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.