Alert archive / Mississippi / Jefferson County

Weather alerts in Jefferson County, Mississippi, 2012

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

Jefferson County and its neighbors

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

Alerts
130
Warnings
33
Watches
29
Advisories
15
Busiest month
December20 alerts
Busiest day
December 25, 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.

0 of 2 tornado warnings covering Jefferson County in 2012 had a tornado report inside them; 0 of 1 tornado reports fell inside a warning.

Jefferson County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings20100%10%
Severe thunderstorm warnings221436%6100%14 min
Flash flood warnings8363%0

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Jackson, MS: tornado warnings1022476%5975%14 min
NWS Jackson, MS: severe thunderstorm warnings66538243%87285%25 min
NWS Jackson, MS: flash flood warnings1587155%16084%93 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, Central Time. Each opens its own page with the text, the map, the radar and the sounding.

IssuedProductOfficeLasted
Jan 9, 5:04 AM CSTDense Fog AdvisoryJAN5 hr
Jan 10, 4:08 PM CSTMesoscale DiscussionSPC82 min
Jan 12, 3:47 AM CSTWind AdvisoryJAN14 hr
Jan 17, 9:26 AM CSTMesoscale DiscussionSPC34 min
Jan 17, 3:45 PM CSTMesoscale DiscussionSPC60 min
Jan 22, 9:47 PM CSTMesoscale DiscussionSPC58 min
Jan 22, 10:59 PM CSTTornado WatchSPC7 hr
Jan 23, 1:25 AM CSTMesoscale DiscussionSPC2 hr
Jan 25, 2:08 PM CSTTornado WatchSPC7 hr
Jan 25, 4:49 PM CSTMesoscale DiscussionSPC86 min
Feb 3, 2:12 PM CSTSevere Thunderstorm WarningJAN63 min
Feb 3, 2:58 PM CSTSpecial Weather StatementJAN47 min
Feb 4, 2:34 AM CSTFlash Flood WatchJAN12 hr
Feb 15, 6:04 PM CSTSpecial Weather StatementJAN56 min
Feb 15, 8:06 PM CSTFlash Flood WarningJAN114 min
Feb 17, 2:17 PM CSTFlash Flood WatchJAN30 hr
Feb 18, 1:50 PM CSTSpecial Weather StatementJAN25 min
Feb 23, 4:55 AM CSTWind AdvisoryJAN14 hr
Mar 2, 1:47 PM CSTSevere Thunderstorm WatchSPC9 hr
Mar 2, 7:18 PM CSTMesoscale DiscussionSPC57 min
Mar 11, 6:42 PM CDTTornado WatchSPC8 hr
Mar 11, 8:44 PM CDTMesoscale DiscussionSPC91 min
Mar 19, 3:00 PM CDTWind AdvisoryJAN28 hr
Mar 20, 4:36 AM CDTFlash Flood WatchJAN47 hr
Mar 21, 5:04 AM CDTTornado WatchSPC7 hr
Mar 21, 9:25 AM CDTMesoscale DiscussionSPC95 min
Mar 21, 10:07 AM CDTTornado WatchSPC8 hr
Mar 21, 10:10 AM CDTSpecial Weather StatementJAN60 min
Mar 21, 10:18 AM CDTSevere Thunderstorm WarningJAN42 min
Mar 21, 10:24 AM CDTTornado WarningJAN27 min
Mar 21, 10:29 AM CDTTornado WarningJAN40 min
Mar 23, 7:04 AM CDTDense Fog AdvisoryJAN3 hr
Apr 2, 12:15 PM CDTMesoscale DiscussionSPC90 min
Apr 2, 12:50 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 2, 2:15 PM CDTSevere Thunderstorm WarningJAN60 min
Apr 2, 3:05 PM CDTSevere Thunderstorm WarningJAN55 min
Apr 2, 3:10 PM CDTFlash Flood WarningJAN2 hr
Apr 2, 3:23 PM CDTMesoscale DiscussionSPC2 hr
Apr 3, 2:22 PM CDTSevere Thunderstorm WatchSPC8 hr
Apr 3, 5:24 PM CDTMesoscale DiscussionSPC66 min
Apr 3, 5:59 PM CDTSpecial Weather StatementJAN46 min
Apr 3, 6:46 PM CDTSevere Thunderstorm WarningJAN34 min
Apr 5, 1:35 AM CDTMesoscale DiscussionSPC85 min
Apr 5, 1:53 AM CDTTornado WatchSPC9 hr
Apr 5, 3:30 AM CDTMesoscale DiscussionSPC2 hr
Apr 5, 7:36 AM CDTMesoscale DiscussionSPC54 min
Apr 21, 12:33 AM CDTSpecial Weather StatementJAN32 min
Apr 21, 12:40 AM CDTSevere Thunderstorm WarningJAN65 min
May 2, 3:22 PM CDTSpecial Weather StatementJAN28 min
May 7, 1:07 PM CDTSevere Thunderstorm WatchSPC5 hr
May 7, 2:40 PM CDTSpecial Weather StatementJAN60 min
May 7, 3:53 PM CDTMesoscale DiscussionSPC97 min
May 21, 2:12 PM CDTSpecial Weather StatementJAN28 min
May 21, 2:33 PM CDTFlash Flood WarningJAN117 min
May 21, 3:17 PM CDTSevere Thunderstorm WarningJAN43 min
May 21, 4:35 PM CDTMesoscale DiscussionSPC55 min
May 30, 12:07 PM CDTMesoscale DiscussionSPC83 min
May 31, 10:41 AM CDTSevere Thunderstorm WatchSPC6 hr
May 31, 1:53 PM CDTMesoscale DiscussionSPC67 min
May 31, 2:13 PM CDTSevere Thunderstorm WarningJAN62 min
Jun 11, 8:37 PM CDTSevere Thunderstorm WatchSPC4 hr
Jun 11, 9:58 PM CDTSevere Thunderstorm WarningJAN62 min
Jun 11, 10:51 PM CDTMesoscale DiscussionSPC54 min
Jun 12, 7:11 AM CDTSevere Thunderstorm WatchSPC8 hr
Jun 12, 7:15 AM CDTSevere Thunderstorm WarningJAN30 min
Jun 29, 3:44 AM CDTHeat AdvisoryJAN66 hr
Jul 3, 3:24 PM CDTSpecial Weather StatementJAN31 min
Jul 4, 3:46 PM CDTSevere Thunderstorm WarningJAN29 min
Jul 4, 4:24 PM CDTSevere Thunderstorm WarningJAN38 min
Jul 7, 4:15 PM CDTSevere Thunderstorm WarningJAN30 min
Jul 7, 4:48 PM CDTSpecial Weather StatementJAN27 min
Jul 11, 11:51 AM CDTSpecial Weather StatementJAN59 min
Jul 12, 2:48 PM CDTSpecial Weather StatementJAN57 min
Jul 19, 6:58 PM CDTFlash Flood WarningJAN2 hr
Jul 20, 12:47 PM CDTMesoscale DiscussionSPC2 hr
Jul 28, 8:25 AM CDTFlash Flood WarningJAN3 hr
Jul 29, 3:53 AM CDTHeat AdvisoryJAN4 days
Aug 10, 4:20 PM CDTSevere Thunderstorm WarningJAN55 min
Aug 10, 5:42 PM CDTSevere Thunderstorm WarningJAN63 min
Aug 10, 6:22 PM CDTFlash Flood WarningJAN79 min
Aug 10, 6:25 PM CDTSevere Thunderstorm WarningJAN37 min
Aug 18, 1:37 PM CDTSpecial Weather StatementJAN58 min
Aug 27, 4:58 AM CDTTropical Storm WatchJAN61 hr
Aug 27, 4:32 PM CDTFlash Flood WatchJAN3 days
Aug 27, 4:59 PM CDTTropical Storm WarningJAN3 days
Aug 29, 3:17 PM CDTMesoscale DiscussionSPC28 min
Aug 29, 3:53 PM CDTTornado WatchSPC8 hr
Aug 29, 8:21 PM CDTMesoscale DiscussionSPC84 min
Aug 29, 11:06 PM CDTMesoscale DiscussionSPC84 min
Aug 29, 11:42 PM CDTTornado WatchSPC8 hr
Aug 30, 3:56 PM CDTTornado WatchSPC6 hr
Aug 30, 8:35 PM CDTFlash Flood WatchJAN4 hr
Aug 30, 9:05 PM CDTMesoscale DiscussionSPC55 min
Aug 31, 3:11 PM CDTSpecial Weather StatementJAN39 min
Sep 3, 3:32 AM CDTHeat AdvisoryJAN5 days
Sep 29, 4:02 AM CDTFlash Flood WatchJAN45 hr
Sep 29, 1:00 PM CDTSpecial Weather StatementJAN55 min
Sep 30, 5:50 PM CDTTornado WatchSPC8 hr
Oct 6, 3:00 AM CDTSpecial Weather StatementJAN70 min
Oct 17, 6:29 PM CDTMesoscale DiscussionSPC91 min
Oct 17, 7:01 PM CDTTornado WatchSPC8 hr
Oct 17, 9:28 PM CDTMesoscale DiscussionSPC92 min
Oct 17, 11:49 PM CDTMesoscale DiscussionSPC86 min
Oct 18, 1:02 AM CDTSevere Thunderstorm WarningJAN58 min
Oct 18, 1:49 AM CDTSevere Thunderstorm WarningJAN56 min
Oct 24, 4:11 AM CDTDense Fog AdvisoryJAN6 hr
Oct 25, 3:24 AM CDTDense Fog AdvisoryJAN7 hr
Nov 3, 5:18 AM CDTDense Fog AdvisoryJAN5 hr
Nov 12, 12:38 AM CSTSpecial Weather StatementJAN37 min
Nov 26, 10:14 PM CSTMesoscale DiscussionSPC3 hr
Dec 2, 1:52 PM CSTDense Fog AdvisoryJAN20 hr
Dec 8, 4:03 AM CSTDense Fog AdvisoryJAN6 hr
Dec 9, 9:59 PM CSTMesoscale DiscussionSPC61 min
Dec 10, 4:07 AM CSTMesoscale DiscussionSPC113 min
Dec 10, 5:23 AM CSTSevere Thunderstorm WarningJAN37 min
Dec 16, 5:00 AM CSTMesoscale DiscussionSPC90 min
Dec 16, 9:54 AM CSTMesoscale DiscussionSPC96 min
Dec 19, 9:53 AM CSTWind AdvisoryJAN32 hr
Dec 20, 1:07 AM CSTSevere Thunderstorm WatchSPC5 hr
Dec 20, 4:08 AM CSTMesoscale DiscussionSPC67 min
Dec 20, 4:34 AM CSTSevere Thunderstorm WarningJAN71 min
Dec 25, 5:03 AM CSTWind AdvisoryJAN25 hr
Dec 25, 10:17 AM CSTFlash Flood WatchJAN9 hr
Dec 25, 11:50 AM CSTFlash Flood WarningJAN4 hr
Dec 25, 12:19 PM CSTMesoscale DiscussionSPC71 min
Dec 25, 12:58 PM CSTTornado Watch PDSSPC9 hr
Dec 25, 1:49 PM CSTSevere Thunderstorm WarningJAN41 min
Dec 25, 2:02 PM CSTSevere Thunderstorm WarningJAN43 min
Dec 25, 2:55 PM CSTFlash Flood WarningJAN2 hr
Dec 28, 9:02 AM CSTFlash Flood WatchJAN11 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.