Alert archive / South Dakota / Sully County

Weather alerts in Sully County, South Dakota, 2018

141 weather alerts in 2018, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Sully County and its neighbors

Each county as a circle sized by its count in 2018. Tap one for its archive.

Alerts
141
Warnings
39
Watches
19
Advisories
33
Busiest month
June37 alerts
Busiest day
May 18, 201811 alerts

Over time

By month

Warning verification

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

Sully County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings302613%1587%17 min
Flash flood warnings00

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Aberdeen, SD: tornado warnings7271%933%8 min
NWS Aberdeen, SD: severe thunderstorm warnings23315832%29082%17 min
NWS Aberdeen, SD: flash flood warnings12118%1669%142 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 1, 11:55 AM CSTWind Chill AdvisoryABR22 hr
Jan 9, 4:18 AM CSTWinter Weather AdvisoryABR50 hr
Jan 11, 12:34 AM CSTWind Chill AdvisoryABR34 hr
Jan 14, 3:25 AM CSTWind Chill AdvisoryABR56 hr
Jan 22, 3:20 PM CSTDense Fog AdvisoryABR18 hr
Feb 7, 3:01 PM CSTWinter Weather AdvisoryABR33 hr
Feb 8, 6:31 PM CSTWinter Storm WarningABR5 hr
Feb 9, 3:12 PM CSTWind Chill AdvisoryABR19 hr
Feb 17, 3:08 PM CSTWinter Storm WatchABR20 hr
Feb 18, 11:15 AM CSTWinter Storm WarningABR43 hr
Feb 20, 2:53 PM CSTWind Chill AdvisoryABR19 hr
Feb 21, 2:38 PM CSTWinter Weather AdvisoryABR36 hr
Feb 28, 2:07 AM CSTDense Fog AdvisoryABR8 hr
Mar 2, 2:58 PM CSTWinter Storm WatchABR47 hr
Mar 3, 2:07 PM CSTDense Fog AdvisoryABR22 hr
Mar 4, 4:40 AM CSTBlizzard WarningABR55 hr
Mar 10, 9:01 AM CSTWinter Weather AdvisoryABR3 hr
Mar 15, 3:46 AM CDTWinter Weather AdvisoryABR45 hr
Mar 16, 7:14 PM CDTWinter Weather AdvisoryABR6 hr
Mar 22, 5:50 AM CDTDense Fog AdvisoryABR8 hr
Mar 25, 5:47 AM CDTWinter Weather AdvisoryABR6 hr
Mar 25, 3:32 PM CDTWinter Weather AdvisoryABR23 hr
Mar 30, 1:15 PM CDTWind AdvisoryABR21 hr
Apr 2, 4:12 AM CDTWinter Weather AdvisoryABR36 hr
Apr 6, 3:34 PM CDTWinter Weather AdvisoryABR53 hr
Apr 10, 2:36 PM CDTWinter Storm WatchABR49 hr
Apr 12, 11:48 AM CDTBlizzard WarningABR55 hr
Apr 17, 2:27 AM CDTWinter Weather AdvisoryABR24 hr
Apr 29, 3:52 AM CDTWind AdvisoryABR16 hr
May 7, 7:17 PM CDTMesoscale DiscussionSPC118 min
May 7, 8:02 PM CDTSpecial Weather StatementABR58 min
May 7, 8:21 PM CDTSpecial Weather StatementABR54 min
May 8, 3:45 PM CDTSevere Thunderstorm WarningABR18 min
May 17, 2:23 PM CDTSevere Thunderstorm WatchSPC10 hr
May 17, 3:47 PM CDTMesoscale DiscussionSPC28 min
May 17, 5:54 PM CDTMesoscale DiscussionSPC66 min
May 17, 7:20 PM CDTSevere Thunderstorm WarningABR55 min
May 17, 8:08 PM CDTSevere Thunderstorm WarningABR52 min
May 17, 8:11 PM CDTMesoscale DiscussionSPC64 min
May 17, 8:47 PM CDTSevere Thunderstorm WarningABR43 min
May 17, 8:58 PM CDTSevere Thunderstorm WarningABR47 min
May 17, 9:21 PM CDTSevere Thunderstorm WarningABR39 min
May 17, 9:34 PM CDTSevere Thunderstorm WarningABR41 min
May 17, 9:55 PM CDTSevere Thunderstorm WarningABR50 min
May 17, 10:03 PM CDTMesoscale DiscussionSPC117 min
May 17, 10:11 PM CDTSevere Thunderstorm WarningABR49 min
May 17, 10:42 PM CDTSevere Thunderstorm WarningABR63 min
May 23, 2:36 PM CDTMesoscale DiscussionSPC114 min
May 27, 6:06 PM CDTMesoscale DiscussionSPC84 min
May 27, 6:27 PM CDTSevere Thunderstorm WatchSPC6 hr
May 27, 11:09 PM CDTSpecial Weather StatementABR51 min
May 27, 11:14 PM CDTMesoscale DiscussionSPC91 min
May 27, 11:42 PM CDTSevere Thunderstorm WarningABR33 min
May 29, 5:37 PM CDTSpecial Weather StatementABR38 min
Jun 1, 2:53 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 1, 6:32 PM CDTMesoscale DiscussionSPC88 min
Jun 1, 7:23 PM CDTSevere Thunderstorm WarningABR67 min
Jun 1, 8:03 PM CDTSpecial Weather StatementABR57 min
Jun 1, 8:14 PM CDTSevere Thunderstorm WarningABR46 min
Jun 1, 9:02 PM CDTMesoscale DiscussionSPC58 min
Jun 2, 2:56 AM CDTWind AdvisoryABR16 hr
Jun 5, 9:07 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 6, 12:32 AM CDTHigh Wind WarningABR3 hr
Jun 8, 2:32 AM CDTSpecial Weather StatementABR58 min
Jun 8, 7:43 PM CDTSpecial Weather StatementABR47 min
Jun 10, 6:36 PM CDTMesoscale DiscussionSPC114 min
Jun 10, 8:52 PM CDTMesoscale DiscussionSPC113 min
Jun 10, 10:21 PM CDTMesoscale DiscussionSPC54 min
Jun 14, 3:40 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 14, 6:15 PM CDTMesoscale DiscussionSPC90 min
Jun 16, 3:00 PM CDTFlash Flood WatchABR15 hr
Jun 16, 3:15 PM CDTMesoscale DiscussionSPC90 min
Jun 16, 3:54 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 16, 6:14 PM CDTMesoscale DiscussionSPC91 min
Jun 16, 6:32 PM CDTSevere Thunderstorm WarningABR43 min
Jun 16, 7:11 PM CDTSevere Thunderstorm WarningABR49 min
Jun 16, 7:59 PM CDTMesoscale DiscussionSPC91 min
Jun 16, 9:50 PM CDTMesoscale DiscussionSPC85 min
Jun 26, 11:52 PM CDTMesoscale DiscussionSPC113 min
Jun 27, 12:12 AM CDTSevere Thunderstorm WatchSPC9 hr
Jun 27, 2:18 AM CDTMesoscale DiscussionSPC87 min
Jun 27, 2:42 AM CDTSevere Thunderstorm WarningABR48 min
Jun 27, 3:28 AM CDTSevere Thunderstorm WarningABR47 min
Jun 27, 4:18 AM CDTMesoscale DiscussionSPC87 min
Jun 27, 7:25 AM CDTMesoscale DiscussionSPC95 min
Jun 27, 9:48 AM CDTAreal Flood WarningABR3 hr
Jun 29, 5:57 PM CDTMesoscale DiscussionSPC63 min
Jun 29, 6:19 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 29, 8:52 PM CDTSevere Thunderstorm WarningABR53 min
Jun 29, 9:23 PM CDTSevere Thunderstorm WarningABR37 min
Jun 29, 9:57 PM CDTSevere Thunderstorm WarningABR48 min
Jul 3, 6:16 PM CDTMesoscale DiscussionSPC2 hr
Jul 3, 6:42 PM CDTSevere Thunderstorm WatchSPC4 hr
Jul 3, 10:38 PM CDTMesoscale DiscussionSPC97 min
Jul 3, 11:02 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 4, 1:13 AM CDTSevere Thunderstorm WarningABR47 min
Jul 4, 1:42 AM CDTSevere Thunderstorm WarningABR48 min
Jul 4, 2:10 AM CDTSevere Thunderstorm WarningABR50 min
Jul 4, 3:14 AM CDTMesoscale DiscussionSPC91 min
Jul 6, 2:53 PM CDTHeat AdvisoryABR29 hr
Jul 7, 3:08 AM CDTHeat AdvisoryABR41 hr
Jul 18, 3:43 PM CDTTornado WatchSPC7 hr
Jul 18, 5:16 PM CDTMesoscale DiscussionSPC119 min
Jul 18, 7:56 PM CDTSpecial Weather StatementABR49 min
Jul 22, 3:47 AM CDTSpecial Weather StatementABR43 min
Jul 22, 1:55 PM CDTMesoscale DiscussionSPC3 hr
Jul 22, 6:22 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 22, 8:22 PM CDTMesoscale DiscussionSPC83 min
Aug 4, 3:42 PM CDTMesoscale DiscussionSPC93 min
Aug 4, 9:37 PM CDTSevere Thunderstorm WarningABR23 min
Aug 23, 4:32 PM CDTMesoscale DiscussionSPC118 min
Aug 23, 8:29 PM CDTMesoscale DiscussionSPC91 min
Aug 23, 11:32 PM CDTMesoscale DiscussionSPC58 min
Aug 26, 6:15 PM CDTMesoscale DiscussionSPC3 hr
Aug 26, 7:18 PM CDTSevere Thunderstorm WarningABR42 min
Aug 26, 7:37 PM CDTTornado WatchSPC5 hr
Aug 26, 7:39 PM CDTSevere Thunderstorm WarningABR51 min
Aug 26, 8:14 PM CDTSevere Thunderstorm WarningABR61 min
Aug 27, 6:17 PM CDTMesoscale DiscussionSPC88 min
Sep 2, 12:51 AM CDTMesoscale DiscussionSPC2 hr
Sep 2, 2:54 AM CDTSpecial Weather StatementABR51 min
Sep 9, 5:23 PM CDTMesoscale DiscussionSPC2 hr
Sep 10, 7:23 AM CDTSevere Thunderstorm WarningABR52 min
Sep 10, 8:08 AM CDTSpecial Weather StatementABR37 min
Sep 10, 8:14 AM CDTSevere Thunderstorm WarningABR26 min
Sep 10, 8:26 AM CDTSpecial Weather StatementABR34 min
Sep 19, 3:47 AM CDTMesoscale DiscussionSPC3 hr
Sep 19, 4:01 AM CDTSevere Thunderstorm WarningABR59 min
Sep 25, 9:57 AM CDTWind AdvisoryABR9 hr
Oct 3, 3:24 AM CDTFreeze WatchABR11 hr
Oct 3, 3:24 AM CDTWind AdvisoryABR18 hr
Oct 3, 2:51 PM CDTFreeze WarningABR18 hr
Oct 9, 4:51 AM CDTWinter Weather AdvisoryABR38 hr
Nov 15, 3:08 PM CSTWinter Weather AdvisoryABR33 hr
Nov 22, 1:39 AM CSTDense Fog AdvisoryABR10 hr
Nov 27, 3:22 PM CSTWinter Weather AdvisoryABR27 hr
Nov 29, 8:25 PM CSTDense Fog AdvisoryABR16 hr
Dec 25, 3:45 AM CSTWinter Storm WatchABR11 hr
Dec 25, 2:28 PM CSTWinter Storm WarningABR37 hr
Dec 26, 3:16 PM CSTBlizzard WarningABR45 hr
Dec 30, 2:36 PM CSTWinter Weather AdvisoryABR27 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 archive20172019

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.