Alert archive / Arkansas / Jefferson County

Weather alerts in Jefferson County, Arkansas, 2020

138 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts
138
Warnings
43
Watches
20
Advisories
23
Busiest month
April22 alerts
Busiest day
May 22, 202011 alerts

Over time

By month

Warning verification

How often warnings here had a storm report inside them, and how much warning the reports had.

Jefferson County, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings321359%1292%32 min
Flash flood warnings7357%1100%120 min

Each office's whole area, 2020

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Little Rock, AR: tornado warnings541180%3070%16 min
NWS Little Rock, AR: severe thunderstorm warnings37613664%29885%24 min
NWS Little Rock, AR: flash flood warnings1074360%10484%82 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, 4:30 AM CSTFlash Flood WatchLZK49 hr
Jan 10, 4:53 AM CSTMesoscale DiscussionSPC2 hr
Jan 10, 4:55 PM CSTMesoscale DiscussionSPC2 hr
Jan 10, 5:34 PM CSTTornado WatchSPC11 hr
Jan 10, 10:40 PM CSTMesoscale DiscussionSPC2 hr
Jan 10, 11:44 PM CSTSevere Thunderstorm WarningLZK46 min
Jan 11, 12:32 AM CSTFlash Flood WarningLZK3 hr
Jan 11, 12:33 AM CSTSpecial Weather StatementLZK42 min
Jan 11, 12:39 AM CSTSevere Thunderstorm WarningLZK51 min
Jan 11, 1:29 AM CSTSevere Thunderstorm WarningLZK61 min
Jan 11, 2:28 AM CSTSevere Thunderstorm WarningLZK62 min
Jan 11, 2:38 AM CSTFlash Flood WarningLZK3 hr
Jan 14, 6:24 PM CSTDense Fog AdvisoryLZK15 hr
Jan 15, 9:03 AM CSTDense Fog AdvisoryLZK117 min
Jan 15, 3:11 PM CSTMesoscale DiscussionSPC2 hr
Jan 26, 10:52 PM CSTDense Fog AdvisoryLZK11 hr
Jan 27, 11:31 PM CSTDense Fog AdvisoryLZK12 hr
Feb 9, 11:19 PM CSTSpecial Weather StatementLZK26 min
Feb 10, 3:33 AM CSTFlash Flood WatchLZK62 hr
Feb 24, 12:20 PM CSTMesoscale DiscussionSPC115 min
Mar 11, 9:54 AM CDTMesoscale DiscussionSPC2 hr
Mar 12, 9:23 PM CDTMesoscale DiscussionSPC97 min
Mar 17, 3:49 AM CDTDense Fog AdvisoryLZK5 hr
Mar 19, 2:24 PM CDTTornado WatchSPC8 hr
Mar 19, 9:50 PM CDTTornado WatchSPC6 hr
Mar 20, 12:56 AM CDTSpecial Weather StatementLZK34 min
Mar 24, 2:15 AM CDTMesoscale DiscussionSPC2 hr
Mar 24, 2:56 AM CDTSpecial Weather StatementLZK34 min
Mar 28, 12:14 PM CDTMesoscale DiscussionSPC2 hr
Mar 28, 2:10 PM CDTTornado WatchSPC5 hr
Mar 28, 2:56 PM CDTMesoscale DiscussionSPC94 min
Apr 8, 5:10 AM CDTDense Fog AdvisoryLZK5 hr
Apr 12, 3:17 AM CDTWind AdvisoryLZK28 hr
Apr 12, 9:21 AM CDTSpecial Weather StatementLZK24 min
Apr 12, 4:44 PM CDTMesoscale DiscussionSPC2 hr
Apr 12, 5:59 PM CDTSevere Thunderstorm WatchSPC4 hr
Apr 12, 7:45 PM CDTSevere Thunderstorm WarningLZK45 min
Apr 12, 7:56 PM CDTMesoscale DiscussionSPC2 hr
Apr 12, 8:28 PM CDTSevere Thunderstorm WarningLZK62 min
Apr 14, 2:38 PM CDTFrost AdvisoryLZK18 hr
Apr 22, 3:35 PM CDTFlash Flood WatchLZK10 hr
Apr 22, 11:29 PM CDTSpecial Weather StatementLZK46 min
Apr 24, 8:31 PM CDTSevere Thunderstorm WatchSPC5 hr
Apr 24, 10:17 PM CDTMesoscale DiscussionSPC118 min
Apr 24, 11:35 PM CDTSpecial Weather StatementLZK55 min
Apr 25, 1:24 PM CDTWind AdvisoryLZK6 hr
Apr 28, 7:35 PM CDTSevere Thunderstorm WatchSPC7 hr
Apr 28, 10:46 PM CDTSevere Thunderstorm WarningLZK44 min
Apr 28, 11:12 PM CDTMesoscale DiscussionSPC63 min
Apr 28, 11:14 PM CDTSevere Thunderstorm WarningLZK46 min
Apr 28, 11:24 PM CDTSevere Thunderstorm WarningLZK51 min
Apr 28, 11:55 PM CDTSevere Thunderstorm WarningLZK65 min
Apr 29, 12:12 AM CDTSevere Thunderstorm WarningLZK48 min
May 7, 2:52 PM CDTWind AdvisoryLZK28 hr
May 16, 1:16 PM CDTMesoscale DiscussionSPC2 hr
May 22, 12:09 AM CDTSpecial Weather StatementLZK51 min
May 22, 12:16 AM CDTSevere Thunderstorm WarningLZK31 min
May 22, 12:30 AM CDTSpecial Weather StatementLZK45 min
May 22, 12:33 AM CDTSevere Thunderstorm WarningLZK16 min
May 22, 12:46 AM CDTSpecial Weather StatementLZK44 min
May 22, 1:17 AM CDTSpecial Weather StatementLZK43 min
May 22, 1:38 AM CDTSevere Thunderstorm WarningLZK32 min
May 22, 1:52 AM CDTSevere Thunderstorm WarningLZK38 min
May 22, 2:18 AM CDTSpecial Weather StatementLZK42 min
May 22, 2:39 AM CDTSevere Thunderstorm WarningLZK35 min
May 22, 12:02 PM CDTMesoscale DiscussionSPC88 min
May 22, 7:34 PM CDTSevere Thunderstorm WatchSPC8 hr
May 25, 7:44 PM CDTSevere Thunderstorm WarningLZK31 min
May 25, 8:14 PM CDTSevere Thunderstorm WarningLZK46 min
May 25, 9:19 PM CDTSpecial Weather StatementLZK41 min
May 25, 9:31 PM CDTSpecial Weather StatementLZK44 min
May 25, 10:22 PM CDTSevere Thunderstorm WarningLZK23 min
Jun 4, 1:48 AM CDTSpecial Weather StatementLZK27 min
Jun 5, 10:38 AM CDTMesoscale DiscussionSPC2 hr
Jun 5, 7:01 PM CDTSevere Thunderstorm WarningLZK33 min
Jun 5, 7:36 PM CDTSevere Thunderstorm WarningLZK37 min
Jun 5, 9:16 PM CDTSevere Thunderstorm WarningLZK44 min
Jun 7, 2:50 AM CDTFlash Flood WatchLZK49 hr
Jun 7, 3:04 PM CDTWind AdvisoryLZK52 hr
Jun 8, 1:30 PM CDTFlash Flood WarningLZK3 hr
Jun 21, 3:31 PM CDTSevere Thunderstorm WarningLZK29 min
Jun 22, 8:20 AM CDTSpecial Weather StatementLZK40 min
Jun 23, 11:30 AM CDTSevere Thunderstorm WarningLZK45 min
Jun 23, 12:01 PM CDTMesoscale DiscussionSPC2 hr
Jun 29, 4:37 PM CDTSpecial Weather StatementLZK38 min
Jun 29, 4:49 PM CDTSevere Thunderstorm WarningLZK41 min
Jun 30, 2:22 PM CDTHeat AdvisoryLZK53 hr
Jul 2, 4:44 PM CDTMesoscale DiscussionSPC2 hr
Jul 2, 10:20 PM CDTFlash Flood WarningLZK3 hr
Jul 9, 10:46 AM CDTMesoscale DiscussionSPC119 min
Jul 9, 12:13 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 9, 3:41 PM CDTMesoscale DiscussionSPC94 min
Jul 10, 4:11 AM CDTHeat AdvisoryLZK15 hr
Jul 10, 9:19 PM CDTHeat AdvisoryLZK23 hr
Jul 13, 2:32 PM CDTHeat AdvisoryLZK29 hr
Jul 14, 8:34 AM CDTSpecial Weather StatementLZK41 min
Jul 14, 2:43 PM CDTHeat AdvisoryLZK29 hr
Jul 15, 2:22 PM CDTHeat AdvisoryLZK30 hr
Jul 20, 1:35 PM CDTSpecial Weather StatementLZK40 min
Jul 20, 2:19 PM CDTFlash Flood WarningLZK65 min
Jul 30, 3:41 PM CDTMesoscale DiscussionSPC2 hr
Aug 10, 3:22 AM CDTHeat AdvisoryLZK17 hr
Aug 11, 5:29 PM CDTSpecial Weather StatementLZK31 min
Aug 14, 7:45 AM CDTSpecial Weather StatementLZK45 min
Aug 14, 8:03 AM CDTSevere Thunderstorm WarningLZK26 min
Aug 22, 3:16 AM CDTDense Fog AdvisoryLZK6 hr
Aug 26, 3:11 AM CDTFlash Flood WatchLZK50 hr
Aug 26, 4:38 PM CDTTropical Storm WarningLZK30 hr
Aug 27, 6:36 AM CDTMesoscale DiscussionSPC114 min
Aug 27, 7:47 AM CDTTornado WatchSPC8 hr
Aug 27, 1:54 PM CDTFlash Flood WarningLZK3 hr
Aug 27, 3:47 PM CDTTornado WatchSPC8 hr
Aug 27, 4:03 PM CDTFlash Flood WarningLZK4 hr
Aug 28, 2:43 PM CDTHeat AdvisoryLZK29 hr
Aug 29, 11:17 AM CDTExcessive Heat WarningLZK9 hr
Aug 29, 3:32 PM CDTMesoscale DiscussionSPC88 min
Aug 29, 3:57 PM CDTSevere Thunderstorm WarningLZK33 min
Aug 29, 4:28 PM CDTSpecial Weather StatementLZK32 min
Aug 31, 6:20 AM CDTSevere Thunderstorm WatchSPC4 hr
Aug 31, 9:38 AM CDTMesoscale DiscussionSPC97 min
Sep 1, 2:56 PM CDTSevere Thunderstorm WarningLZK49 min
Sep 1, 3:17 PM CDTTornado WatchSPC4 hr
Sep 1, 3:35 PM CDTSevere Thunderstorm WarningLZK40 min
Sep 1, 3:39 PM CDTSevere Thunderstorm WarningLZK51 min
Sep 1, 4:56 PM CDTSevere Thunderstorm WarningLZK34 min
Sep 1, 5:10 PM CDTSpecial Weather StatementLZK50 min
Sep 1, 5:47 PM CDTMesoscale DiscussionSPC88 min
Sep 2, 10:43 AM CDTSpecial Weather StatementLZK32 min
Sep 2, 12:35 PM CDTMesoscale DiscussionSPC2 hr
Oct 9, 2:06 AM CDTFlash Flood WatchLZK36 hr
Oct 10, 1:09 AM CDTWind AdvisoryLZK15 hr
Nov 1, 8:22 PM CSTFrost AdvisoryLZK12 hr
Nov 25, 2:56 AM CSTSevere Thunderstorm WarningLZK49 min
Nov 29, 2:27 PM CSTFreeze WarningLZK19 hr
Nov 30, 2:30 PM CSTFreeze WarningLZK19 hr
Dec 19, 9:29 PM CSTDense Fog AdvisoryLZK11 hr
Dec 23, 3:46 PM CSTMesoscale DiscussionSPC89 min
Dec 30, 3:56 AM CSTFlash Flood WatchLZK44 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 archive20192021

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.