Alert archive / South Dakota / Sully County

Weather alerts in Sully County, South Dakota, 2012

107 weather alerts in 2012, 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 2012. Tap one for its archive.

Alerts
107
Warnings
23
Watches
16
Advisories
46
Busiest month
June20 alerts
Busiest day
June 10, 20129 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, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings17853%475%31 min
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Aberdeen, SD: tornado warnings13562%956%16 min
NWS Aberdeen, SD: severe thunderstorm warnings18912434%27484%22 min
NWS Aberdeen, SD: flash flood warnings5420%8100%60 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 3, 2:48 AM CSTWind AdvisoryABR15 hr
Jan 10, 2:20 PM CSTWind AdvisoryABR28 hr
Jan 21, 3:21 AM CSTWinter Weather AdvisoryABR45 hr
Feb 5, 3:44 AM CSTDense Fog AdvisoryABR3 hr
Feb 19, 2:37 PM CSTWinter Weather AdvisoryABR33 hr
Feb 22, 3:52 PM CSTWinter Weather AdvisoryABR6 hr
Feb 22, 9:53 PM CSTWinter Storm WarningABR17 hr
Feb 25, 2:40 PM CSTWind AdvisoryABR24 hr
Feb 26, 3:21 AM CSTWinter Storm WatchABR12 hr
Feb 26, 3:20 PM CSTBlizzard WatchABR23 hr
Feb 27, 2:19 PM CSTBlizzard WarningABR47 hr
Feb 28, 2:43 PM CSTMesoscale DiscussionSPC5 hr
Mar 1, 3:17 AM CSTDense Fog AdvisoryABR8 hr
Mar 2, 3:40 AM CSTWind AdvisoryABR17 hr
Mar 3, 3:18 PM CSTWind AdvisoryABR24 hr
Mar 12, 8:28 AM CDTDense Fog AdvisoryABR3 hr
Mar 17, 3:11 PM CDTWind AdvisoryABR30 hr
Mar 23, 1:19 AM CDTDense Fog AdvisoryABR10 hr
Mar 25, 3:19 PM CDTHigh Wind WatchABR20 hr
Mar 26, 3:20 AM CDTWind AdvisoryABR16 hr
Mar 26, 11:45 AM CDTHigh Wind WarningABR28 hr
Mar 26, 6:28 PM CDTSevere Thunderstorm WatchSPC7 hr
Mar 26, 7:14 PM CDTWind AdvisoryABR24 hr
Mar 26, 9:17 PM CDTMesoscale DiscussionSPC118 min
Apr 1, 10:57 PM CDTWind AdvisoryABR21 hr
Apr 5, 3:10 PM CDTWind AdvisoryABR29 hr
Apr 7, 3:32 AM CDTWind AdvisoryABR16 hr
Apr 14, 3:28 PM CDTWind AdvisoryABR31 hr
Apr 21, 3:26 AM CDTWind AdvisoryABR16 hr
Apr 27, 3:59 AM CDTWind AdvisoryABR6 hr
May 2, 7:20 PM CDTMesoscale DiscussionSPC55 min
May 2, 8:07 PM CDTSevere Thunderstorm WarningABR53 min
May 5, 3:06 AM CDTMesoscale DiscussionSPC84 min
May 5, 3:19 AM CDTSevere Thunderstorm WatchSPC9 hr
May 5, 8:58 AM CDTSevere Thunderstorm WarningABR47 min
May 10, 5:06 PM CDTWind AdvisoryABR10 hr
May 11, 2:49 PM CDTFrost AdvisoryABR16 hr
May 16, 11:14 AM CDTWind AdvisoryABR7 hr
May 18, 7:22 PM CDTMesoscale DiscussionSPC2 hr
May 19, 12:51 AM CDTMesoscale DiscussionSPC84 min
May 21, 3:02 PM CDTWind AdvisoryABR23 hr
May 22, 2:59 PM CDTMesoscale DiscussionSPC91 min
May 22, 5:54 PM CDTSevere Thunderstorm WatchSPC7 hr
May 22, 7:30 PM CDTMesoscale DiscussionSPC90 min
May 26, 8:58 PM CDTSevere Thunderstorm WarningABR30 min
May 26, 9:59 PM CDTSevere Thunderstorm WarningABR46 min
May 26, 10:43 PM CDTSevere Thunderstorm WarningABR62 min
May 28, 4:57 AM CDTWind AdvisoryABR15 hr
Jun 1, 3:04 PM CDTMesoscale DiscussionSPC86 min
Jun 9, 10:08 PM CDTMesoscale DiscussionSPC67 min
Jun 9, 10:23 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 10, 12:10 AM CDTSevere Thunderstorm WarningABR65 min
Jun 10, 12:45 AM CDTMesoscale DiscussionSPC60 min
Jun 10, 12:49 AM CDTSevere Thunderstorm WarningABR26 min
Jun 10, 1:03 AM CDTSevere Thunderstorm WarningABR57 min
Jun 10, 1:13 AM CDTSevere Thunderstorm WarningABR62 min
Jun 10, 1:15 AM CDTSevere Thunderstorm WarningABR30 min
Jun 10, 1:44 AM CDTSevere Thunderstorm WarningABR31 min
Jun 15, 4:59 PM CDTMesoscale DiscussionSPC91 min
Jun 15, 5:14 PM CDTSevere Thunderstorm WatchSPC6 hr
Jun 19, 11:20 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 25, 3:29 PM CDTHeat AdvisoryABR29 hr
Jun 25, 8:37 PM CDTMesoscale DiscussionSPC83 min
Jun 25, 10:27 PM CDTSevere Thunderstorm WarningABR48 min
Jun 25, 11:22 PM CDTSevere Thunderstorm WarningABR20 min
Jun 29, 7:59 AM CDTMesoscale DiscussionSPC91 min
Jun 30, 3:53 PM CDTMesoscale DiscussionSPC97 min
Jun 30, 4:57 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 1, 2:44 PM CDTHeat AdvisoryABR3 days
Jul 14, 3:00 PM CDTHeat AdvisoryABR53 hr
Jul 16, 3:07 PM CDTMesoscale DiscussionSPC113 min
Jul 18, 3:39 PM CDTHeat AdvisoryABR54 hr
Jul 21, 12:07 AM CDTSevere Thunderstorm WarningABR38 min
Jul 22, 4:38 PM CDTMesoscale DiscussionSPC97 min
Jul 23, 6:31 PM CDTMesoscale DiscussionSPC89 min
Jul 24, 5:42 PM CDTMesoscale DiscussionSPC93 min
Jul 24, 8:01 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 24, 10:27 PM CDTSevere Thunderstorm WarningABR25 min
Aug 1, 2:53 PM CDTMesoscale DiscussionSPC67 min
Aug 1, 3:19 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 3, 1:31 PM CDTMesoscale DiscussionSPC59 min
Aug 3, 2:14 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 22, 9:25 PM CDTSevere Thunderstorm WarningABR50 min
Sep 3, 4:03 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 3, 4:18 PM CDTSevere Thunderstorm WarningABR42 min
Sep 12, 3:00 PM CDTFrost AdvisoryABR17 hr
Sep 17, 1:51 PM CDTFrost AdvisoryABR19 hr
Sep 21, 3:10 PM CDTFreeze WarningABR18 hr
Sep 22, 3:04 AM CDTFreeze WarningABR30 hr
Oct 2, 3:27 PM CDTWind AdvisoryABR52 hr
Oct 12, 11:29 AM CDTWind AdvisoryABR8 hr
Oct 15, 10:28 AM CDTHigh Wind WatchABR26 hr
Oct 16, 12:04 PM CDTHigh Wind WarningABR58 hr
Oct 16, 12:04 PM CDTWind AdvisoryABR66 hr
Oct 28, 3:48 AM CDTDense Fog AdvisoryABR9 hr
Nov 9, 10:22 AM CSTWinter Weather AdvisoryABR5 hr
Nov 10, 4:05 AM CSTWinter Weather AdvisoryABR24 hr
Nov 10, 12:47 PM CSTWinter Weather AdvisoryABR15 hr
Nov 10, 5:10 PM CSTMesoscale DiscussionSPC5 hr
Nov 18, 7:14 AM CSTDense Fog AdvisoryABR4 hr
Nov 21, 4:05 AM CSTWind AdvisoryABR41 hr
Nov 30, 5:08 AM CSTDense Fog AdvisoryABR4 hr
Dec 2, 12:23 AM CSTDense Fog AdvisoryABR8 hr
Dec 6, 2:35 PM CSTWinter Weather AdvisoryABR27 hr
Dec 7, 4:08 AM CSTWinter Storm WatchABR24 hr
Dec 8, 4:02 AM CSTWinter Weather AdvisoryABR38 hr
Dec 13, 7:48 PM CSTDense Fog AdvisoryABR13 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.