Alert archive / Arkansas / Jefferson County

Weather alerts in Jefferson County, Arkansas, 2017

141 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts
141
Warnings
31
Watches
20
Advisories
40
Busiest month
April34 alerts
Busiest day
April 26, 20179 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 3 tornado warnings covering Jefferson County in 2017 had a tornado report inside them.

Jefferson County, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3167%0
Severe thunderstorm warnings14564%425%2 min
Flash flood warnings7443%3100%96 min

Each office's whole area, 2017

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Little Rock, AR: tornado warnings53689%1947%21 min
NWS Little Rock, AR: severe thunderstorm warnings32714356%32381%23 min
NWS Little Rock, AR: flash flood warnings834447%7797%76 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
Dec 31, 9:11 PM CSTDense Fog AdvisoryLZK13 hr
Jan 2, 1:32 AM CSTDense Fog AdvisoryLZK8 hr
Jan 2, 5:39 PM CSTDense Fog AdvisoryLZK17 hr
Jan 5, 2:10 PM CSTWinter Weather AdvisoryLZK28 hr
Jan 9, 3:27 AM CSTLake Wind AdvisoryLZK39 hr
Jan 11, 3:50 AM CSTLake Wind AdvisoryLZK14 hr
Jan 13, 6:10 PM CSTDense Fog AdvisoryLZK17 hr
Jan 15, 12:25 AM CSTDense Fog AdvisoryLZK11 hr
Jan 15, 6:17 PM CSTDense Fog AdvisoryLZK14 hr
Jan 16, 2:02 PM CSTMesoscale DiscussionSPC118 min
Jan 16, 10:03 PM CSTSpecial Weather StatementLZK42 min
Jan 21, 3:41 PM CSTTornado WatchSPC7 hr
Jan 21, 5:32 PM CSTMesoscale DiscussionSPC118 min
Jan 21, 8:43 PM CSTSpecial Weather StatementLZK47 min
Jan 22, 3:22 AM CSTWind AdvisoryLZK24 hr
Feb 6, 6:19 AM CSTDense Fog AdvisoryLZK5 hr
Feb 9, 2:12 PM CSTLake Wind AdvisoryLZK28 hr
Feb 11, 10:33 AM CSTLake Wind AdvisoryLZK7 hr
Feb 21, 9:31 PM CSTDense Fog AdvisoryLZK11 hr
Feb 23, 4:10 AM CSTDense Fog AdvisoryLZK5 hr
Feb 28, 1:46 PM CSTMesoscale DiscussionSPC2 hr
Feb 28, 2:57 PM CSTLake Wind AdvisoryLZK27 hr
Feb 28, 3:40 PM CSTTornado WatchSPC6 hr
Mar 1, 2:09 AM CSTMesoscale DiscussionSPC2 hr
Mar 7, 2:58 AM CSTMesoscale DiscussionSPC92 min
Mar 7, 3:37 AM CSTSevere Thunderstorm WatchSPC8 hr
Mar 10, 1:12 AM CSTSevere Thunderstorm WarningLZK48 min
Mar 10, 4:22 AM CSTLake Wind AdvisoryLZK11 hr
Mar 14, 3:50 AM CDTFreeze WarningLZK31 hr
Mar 15, 12:44 PM CDTFreeze WarningLZK15 hr
Mar 23, 2:40 PM CDTLake Wind AdvisoryLZK31 hr
Mar 24, 9:14 PM CDTSevere Thunderstorm WatchSPC6 hr
Mar 25, 12:04 AM CDTSpecial Weather StatementLZK41 min
Mar 25, 12:19 AM CDTSevere Thunderstorm WarningLZK41 min
Apr 4, 9:30 PM CDTLake Wind AdvisoryLZK24 hr
Apr 8, 2:58 PM CDTLake Wind AdvisoryLZK29 hr
Apr 10, 8:25 PM CDTSevere Thunderstorm WarningLZK65 min
Apr 10, 9:15 PM CDTSevere Thunderstorm WarningLZK60 min
Apr 21, 1:12 PM CDTMesoscale DiscussionSPC93 min
Apr 21, 11:42 PM CDTSevere Thunderstorm WarningLZK48 min
Apr 22, 12:41 AM CDTSevere Thunderstorm WatchSPC6 hr
Apr 22, 1:33 AM CDTSpecial Weather StatementLZK42 min
Apr 22, 2:17 AM CDTSpecial Weather StatementLZK43 min
Apr 22, 2:48 AM CDTSevere Thunderstorm WarningLZK42 min
Apr 25, 11:48 AM CDTLake Wind AdvisoryLZK7 hr
Apr 26, 4:19 AM CDTLake Wind AdvisoryLZK15 hr
Apr 26, 9:39 AM CDTMesoscale DiscussionSPC36 min
Apr 26, 10:08 AM CDTTornado WatchSPC7 hr
Apr 26, 1:05 PM CDTMesoscale DiscussionSPC85 min
Apr 26, 4:02 PM CDTSpecial Weather StatementLZK43 min
Apr 26, 4:11 PM CDTTornado WarningLZK34 min
Apr 26, 4:23 PM CDTMesoscale DiscussionSPC67 min
Apr 26, 4:44 PM CDTTornado WatchSPC5 hr
Apr 26, 5:26 PM CDTFlash Flood WarningLZK2 hr
Apr 27, 4:33 AM CDTFlash Flood WatchLZK3 days
Apr 28, 10:18 AM CDTRiver Flood WarningLZK41 hr
Apr 28, 2:31 PM CDTLake Wind AdvisoryLZK44 hr
Apr 29, 5:08 PM CDTSevere Thunderstorm WarningLZK52 min
Apr 29, 6:21 PM CDTMesoscale DiscussionSPC54 min
Apr 29, 10:23 PM CDTSevere Thunderstorm WatchSPC8 hr
Apr 29, 11:37 PM CDTMesoscale DiscussionSPC53 min
Apr 30, 12:54 AM CDTMesoscale DiscussionSPC96 min
Apr 30, 1:58 AM CDTSpecial Weather StatementLZK47 min
Apr 30, 2:12 AM CDTTornado WarningLZK33 min
Apr 30, 3:36 AM CDTMesoscale DiscussionSPC84 min
Apr 30, 4:15 AM CDTSpecial Weather StatementLZK45 min
Apr 30, 5:41 AM CDTMesoscale DiscussionSPC64 min
Apr 30, 5:56 AM CDTFlash Flood WarningLZK4 hr
May 1, 4:02 AM CDTLake Wind AdvisoryLZK15 hr
May 1, 9:57 PM CDTRiver Flood AdvisoryLZK36 hr
May 3, 11:41 AM CDTSpecial Weather StatementLZK49 min
May 3, 12:14 PM CDTFlash Flood WarningLZK3 hr
May 3, 3:13 PM CDTFlash Flood WarningLZK3 hr
May 3, 6:11 PM CDTFlash Flood WarningLZK3 hr
May 3, 9:39 PM CDTRiver Flood AdvisoryLZK36 hr
May 4, 3:09 AM CDTLake Wind AdvisoryLZK16 hr
May 5, 8:57 AM CDTLake Wind AdvisoryLZK9 hr
May 11, 3:17 PM CDTSevere Thunderstorm WatchSPC7 hr
May 11, 5:49 PM CDTMesoscale DiscussionSPC56 min
May 11, 8:32 PM CDTSpecial Weather StatementLZK43 min
May 11, 8:45 PM CDTSpecial Weather StatementLZK45 min
May 12, 10:59 AM CDTMesoscale DiscussionSPC3 hr
May 17, 4:17 AM CDTLake Wind AdvisoryLZK16 hr
May 20, 8:50 PM CDTRiver Flood AdvisoryLZK36 hr
May 26, 10:11 AM CDTLake Wind AdvisoryLZK9 hr
May 28, 12:18 AM CDTSevere Thunderstorm WatchSPC6 hr
May 28, 1:24 AM CDTSevere Thunderstorm WarningLZK26 min
May 28, 2:11 AM CDTMesoscale DiscussionSPC2 hr
May 28, 2:29 AM CDTSevere Thunderstorm WarningLZK31 min
May 28, 2:49 AM CDTSevere Thunderstorm WarningLZK26 min
Jun 18, 9:43 AM CDTSevere Thunderstorm WatchSPC6 hr
Jun 18, 12:36 PM CDTMesoscale DiscussionSPC114 min
Jun 22, 2:27 AM CDTFlash Flood WatchLZK32 hr
Jun 22, 5:07 PM CDTSpecial Weather StatementLZK23 min
Jun 22, 6:32 PM CDTTornado WarningLZK28 min
Jun 22, 6:59 PM CDTMesoscale DiscussionSPC61 min
Jun 23, 6:04 AM CDTFlash Flood WarningLZK3 hr
Jun 23, 12:22 PM CDTMesoscale DiscussionSPC2 hr
Jun 23, 2:04 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 23, 4:35 PM CDTMesoscale DiscussionSPC85 min
Jun 23, 5:30 PM CDTSpecial Weather StatementLZK45 min
Jul 1, 12:39 AM CDTSpecial Weather StatementLZK36 min
Jul 1, 6:04 PM CDTSpecial Weather StatementLZK56 min
Jul 4, 5:58 PM CDTMesoscale DiscussionSPC2 hr
Jul 8, 6:02 AM CDTSpecial Weather StatementLZK43 min
Jul 19, 2:51 PM CDTHeat AdvisoryLZK4 days
Jul 23, 3:15 PM CDTMesoscale DiscussionSPC3 hr
Jul 23, 11:38 PM CDTSpecial Weather StatementLZK37 min
Jul 24, 2:46 PM CDTHeat AdvisoryLZK3 days
Aug 11, 12:21 PM CDTSevere Thunderstorm WarningLZK39 min
Aug 11, 1:00 PM CDTSpecial Weather StatementLZK45 min
Aug 19, 2:50 AM CDTHeat AdvisoryLZK40 hr
Aug 22, 2:06 PM CDTMesoscale DiscussionSPC2 hr
Aug 29, 6:54 PM CDTFlash Flood WatchLZK49 hr
Aug 30, 3:57 PM CDTWind AdvisoryLZK27 hr
Oct 21, 11:56 PM CDTSevere Thunderstorm WatchSPC7 hr
Oct 22, 4:14 AM CDTSpecial Weather StatementLZK76 min
Oct 22, 4:57 AM CDTMesoscale DiscussionSPC93 min
Oct 23, 2:39 PM CDTLake Wind AdvisoryLZK28 hr
Oct 27, 3:50 AM CDTFrost AdvisoryLZK12 hr
Oct 27, 3:50 AM CDTFreeze WarningLZK54 hr
Oct 27, 4:17 PM CDTFreeze WatchLZK11 hr
Nov 3, 2:11 PM CDTMesoscale DiscussionSPC2 hr
Nov 3, 3:39 PM CDTSpecial Weather StatementLZK51 min
Nov 3, 3:43 PM CDTSevere Thunderstorm WarningLZK32 min
Nov 3, 3:49 PM CDTSevere Thunderstorm WatchSPC6 hr
Nov 3, 4:24 PM CDTSevere Thunderstorm WarningLZK36 min
Nov 3, 5:21 PM CDTMesoscale DiscussionSPC114 min
Nov 3, 5:25 PM CDTSevere Thunderstorm WarningLZK50 min
Nov 17, 1:24 PM CSTLake Wind AdvisoryLZK29 hr
Nov 18, 12:55 PM CSTSpecial Weather StatementLZK80 min
Dec 5, 12:04 AM CSTSpecial Weather StatementLZK41 min
Dec 5, 12:28 AM CSTSpecial Weather StatementLZK62 min
Dec 11, 3:26 AM CSTRed Flag WarningLZK15 hr
Dec 13, 4:01 AM CSTLake Wind AdvisoryLZK14 hr
Dec 21, 3:33 AM CSTDense Fog AdvisoryLZK7 hr
Dec 21, 2:42 PM CSTFlash Flood WatchLZK13 hr
Dec 22, 4:06 AM CSTFlash Flood WatchLZK24 hr
Dec 22, 9:04 AM CSTFlash Flood WarningLZK6 hr
Dec 22, 2:34 PM CSTAreal Flood WarningLZK6 hr
Dec 22, 4:52 PM CSTAreal Flood WarningLZK6 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 archive20162018

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.