Alert archive / Tennessee / Anderson County

Weather alerts in Anderson County, Tennessee, 2012

103 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Anderson County and its neighbors

Each county as a circle sized by its count in 2012. Tap one for its archive.

Alerts
103
Warnings
36
Watches
16
Advisories
27
Busiest month
April23 alerts
Busiest day
April 26, 20128 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 5 tornado warnings covering Anderson County in 2012 had a tornado report inside them.

Anderson County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings5180%0
Severe thunderstorm warnings281836%1070%16 min
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Morristown, TN: tornado warnings811285%2383%19 min
NWS Morristown, TN: severe thunderstorm warnings31119836%35878%22 min
NWS Morristown, TN: flash flood warnings16850%1493%63 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 9, 9:11 PM ESTDense Fog AdvisoryMRX8 hr
Jan 11, 3:30 PM ESTWinter Weather AdvisoryMRX45 hr
Jan 12, 3:38 AM ESTWind AdvisoryMRX24 hr
Jan 23, 2:25 AM ESTMesoscale DiscussionSPC2 hr
Jan 23, 2:54 AM ESTSevere Thunderstorm WatchSPC3 hr
Jan 23, 5:28 AM ESTMesoscale DiscussionSPC62 min
Jan 23, 7:32 AM ESTAreal Flood AdvisoryMRX3 hr
Feb 10, 1:03 PM ESTWind AdvisoryMRX30 hr
Feb 14, 6:47 PM ESTDense Fog AdvisoryMRX15 hr
Feb 21, 12:24 PM ESTWind AdvisoryMRX7 hr
Feb 22, 5:55 PM ESTSevere Thunderstorm WarningMRX50 min
Feb 22, 6:51 PM ESTSevere Thunderstorm WarningMRX39 min
Feb 22, 7:28 PM ESTSevere Thunderstorm WarningMRX32 min
Feb 22, 7:34 PM ESTSevere Thunderstorm WarningMRX26 min
Feb 22, 7:52 PM ESTSevere Thunderstorm WarningMRX38 min
Feb 23, 3:37 PM ESTWind AdvisoryMRX27 hr
Feb 24, 2:00 AM ESTMesoscale DiscussionSPC2 hr
Feb 29, 12:11 PM ESTMesoscale DiscussionSPC2 hr
Feb 29, 12:31 PM ESTTornado WatchSPC8 hr
Feb 29, 4:34 PM ESTMesoscale DiscussionSPC116 min
Feb 29, 5:17 PM ESTSevere Thunderstorm WarningMRX58 min
Feb 29, 5:36 PM ESTTornado WarningMRX39 min
Feb 29, 5:37 PM ESTTornado WarningMRX38 min
Feb 29, 8:33 PM ESTMesoscale DiscussionSPC57 min
Mar 1, 12:20 AM ESTMesoscale DiscussionSPC85 min
Mar 2, 10:25 AM ESTTornado WatchSPC5 hr
Mar 2, 10:59 AM ESTFlood WatchMRX14 hr
Mar 2, 12:46 PM ESTMesoscale DiscussionSPC29 min
Mar 2, 2:58 PM ESTMesoscale DiscussionSPC62 min
Mar 2, 3:19 PM ESTTornado WatchSPC8 hr
Mar 2, 5:29 PM ESTTornado WarningMRX31 min
Mar 2, 8:15 PM ESTMesoscale DiscussionSPC90 min
Mar 2, 8:29 PM ESTSevere Thunderstorm WarningMRX46 min
Mar 2, 9:05 PM ESTTornado WarningMRX40 min
Mar 2, 9:14 PM ESTSevere Thunderstorm WarningMRX46 min
Mar 2, 9:41 PM ESTTornado WarningMRX34 min
Mar 15, 2:08 PM EDTMesoscale DiscussionSPC2 hr
Mar 15, 7:23 PM EDTMesoscale DiscussionSPC97 min
Mar 24, 2:18 AM EDTAreal Flood AdvisoryMRX117 min
Mar 31, 2:30 PM EDTSevere Thunderstorm WarningMRX45 min
Apr 1, 3:54 AM EDTDense Fog AdvisoryMRX5 hr
Apr 1, 2:31 PM EDTMesoscale DiscussionSPC89 min
Apr 1, 2:41 PM EDTSevere Thunderstorm WarningMRX49 min
Apr 1, 3:29 PM EDTSevere Thunderstorm WarningMRX46 min
Apr 5, 12:51 PM EDTSevere Thunderstorm WarningMRX39 min
Apr 5, 1:40 PM EDTSevere Thunderstorm WarningMRX50 min
Apr 5, 1:54 PM EDTMesoscale DiscussionSPC96 min
Apr 5, 2:21 PM EDTSevere Thunderstorm WatchSPC8 hr
Apr 5, 4:06 PM EDTMesoscale DiscussionSPC54 min
Apr 5, 7:32 PM EDTSevere Thunderstorm WarningMRX28 min
Apr 6, 3:21 AM EDTFrost AdvisoryMRX31 hr
Apr 10, 3:35 AM EDTFrost AdvisoryMRX29 hr
Apr 10, 8:49 PM EDTFreeze WatchMRX18 hr
Apr 11, 3:01 PM EDTFreeze WarningMRX18 hr
Apr 22, 4:33 AM EDTWind AdvisoryMRX48 hr
Apr 26, 5:07 AM EDTMesoscale DiscussionSPC83 min
Apr 26, 6:14 AM EDTSevere Thunderstorm WarningMRX46 min
Apr 26, 6:22 AM EDTSevere Thunderstorm WatchSPC3 hr
Apr 26, 6:44 AM EDTSevere Thunderstorm WarningMRX46 min
Apr 26, 7:24 AM EDTMesoscale DiscussionSPC96 min
Apr 26, 4:22 PM EDTMesoscale DiscussionSPC83 min
Apr 26, 6:40 PM EDTMesoscale DiscussionSPC95 min
Apr 26, 7:31 PM EDTSevere Thunderstorm WarningMRX24 min
May 18, 5:39 PM EDTSevere Thunderstorm WarningMRX36 min
May 24, 3:30 AM EDTDense Fog AdvisoryMRX7 hr
Jun 29, 4:17 AM EDTHeat AdvisoryMRX4 days
Jul 1, 5:40 PM EDTSevere Thunderstorm WarningMRX35 min
Jul 1, 6:33 PM EDTSevere Thunderstorm WarningMRX42 min
Jul 1, 10:50 PM EDTSevere Thunderstorm WarningMRX40 min
Jul 5, 3:19 PM EDTSevere Thunderstorm WatchSPC6 hr
Jul 5, 5:16 PM EDTSevere Thunderstorm WarningMRX59 min
Jul 5, 5:51 PM EDTSevere Thunderstorm WarningMRX54 min
Jul 10, 5:03 PM EDTSevere Thunderstorm WarningMRX57 min
Jul 17, 2:35 PM EDTSevere Thunderstorm WarningMRX40 min
Jul 18, 1:48 PM EDTAreal Flood AdvisoryMRX3 hr
Jul 19, 7:42 PM EDTMesoscale DiscussionSPC93 min
Jul 19, 8:35 PM EDTSevere Thunderstorm WatchSPC4 hr
Jul 19, 11:26 PM EDTMesoscale DiscussionSPC64 min
Jul 19, 11:55 PM EDTAreal Flood AdvisoryMRX79 min
Aug 1, 2:52 PM EDTMesoscale DiscussionSPC53 min
Aug 1, 3:25 PM EDTSevere Thunderstorm WarningMRX35 min
Aug 1, 3:40 PM EDTSevere Thunderstorm WatchSPC7 hr
Aug 1, 5:00 PM EDTSevere Thunderstorm WarningMRX30 min
Aug 6, 4:27 AM EDTFlood WatchMRX11 hr
Aug 6, 3:19 PM EDTFlood WatchMRX5 hr
Aug 7, 10:15 PM EDTDense Fog AdvisoryMRX8 hr
Aug 9, 1:16 PM EDTMesoscale DiscussionSPC59 min
Aug 9, 4:21 PM EDTAreal Flood AdvisoryMRX2 hr
Aug 10, 12:20 PM EDTMesoscale DiscussionSPC85 min
Sep 17, 3:23 AM EDTFlood WatchMRX39 hr
Sep 18, 12:28 AM EDTAreal Flood AdvisoryMRX6 hr
Sep 18, 2:59 AM EDTAreal Flood AdvisoryMRX3 hr
Oct 1, 8:06 PM EDTTornado WatchSPC3 hr
Oct 10, 3:06 AM EDTFrost AdvisoryMRX30 hr
Oct 14, 11:06 PM EDTSevere Thunderstorm WarningMRX39 min
Oct 28, 3:13 AM EDTWind AdvisoryMRX65 hr
Oct 28, 3:39 AM EDTFrost AdvisoryMRX12 hr
Oct 31, 4:14 AM EDTFreeze WatchMRX11 hr
Oct 31, 3:02 PM EDTFreeze WarningMRX18 hr
Nov 4, 9:52 PM ESTFrost AdvisoryMRX11 hr
Nov 8, 3:19 PM ESTFreeze WarningMRX17 hr
Dec 20, 3:31 AM ESTWind AdvisoryMRX39 hr
Dec 24, 3:29 PM ESTDense Fog AdvisoryMRX19 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 archive20112013

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.