Alert archive / South Dakota / Davison County

Weather alerts in Davison County, South Dakota, 2016

87 weather alerts in 2016, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Davison County and its neighbors

Each county as a circle sized by its count in 2016. Tap one for its archive.

Alerts
87
Warnings
13
Watches
18
Advisories
29
Busiest month
May13 alerts
Busiest day
May 23, 20164 alerts

Over time

By month

Warning verification

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

Davison County, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings3167%10%
Flash flood warnings00

Each office's whole area, 2016

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings10190%617%6 min
NWS Sioux Falls, SD: severe thunderstorm warnings18211636%23982%17 min
NWS Sioux Falls, SD: flash flood warnings341362%23100%64 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, 9:23 PM CSTDense Fog AdvisoryFSD13 hr
Jan 9, 3:45 AM CSTWind Chill AdvisoryFSD31 hr
Jan 16, 3:32 AM CSTWind Chill WarningFSD32 hr
Jan 16, 3:32 AM CSTWind Chill AdvisoryFSD53 hr
Jan 24, 3:11 PM CSTWinter Weather AdvisoryFSD29 hr
Feb 1, 3:30 PM CSTWinter Weather AdvisoryFSD33 hr
Feb 5, 3:57 AM CSTHigh Wind WatchFSD35 hr
Feb 6, 3:15 PM CSTWind AdvisoryFSD51 hr
Feb 13, 3:48 AM CSTWinter Weather AdvisoryFSD32 hr
Feb 18, 2:51 PM CSTHigh Wind WarningFSD21 hr
Feb 18, 2:51 PM CSTWind AdvisoryFSD24 hr
Feb 19, 4:30 AM CSTWind AdvisoryFSD11 hr
Feb 29, 12:48 PM CSTWinter Weather AdvisoryFSD17 hr
Mar 13, 9:58 PM CDTDense Fog AdvisoryFSD14 hr
Mar 21, 3:37 PM CDTWinter Storm WatchFSD37 hr
Mar 23, 4:07 AM CDTWinter Weather AdvisoryFSD17 hr
Apr 5, 4:00 PM CDTWind AdvisoryFSD22 hr
Apr 6, 2:53 PM CDTWind AdvisoryFSD27 hr
Apr 9, 1:28 PM CDTWind AdvisoryFSD6 hr
Apr 24, 1:31 PM CDTMesoscale DiscussionSPC119 min
May 6, 3:19 PM CDTMesoscale DiscussionSPC2 hr
May 9, 2:26 PM CDTMesoscale DiscussionSPC94 min
May 10, 2:42 PM CDTMesoscale DiscussionSPC93 min
May 13, 3:27 AM CDTFreeze WarningFSD30 hr
May 13, 3:44 PM CDTFrost AdvisoryFSD17 hr
May 22, 7:33 PM CDTMesoscale DiscussionSPC87 min
May 22, 8:22 PM CDTSevere Thunderstorm WatchSPC7 hr
May 22, 10:23 PM CDTSevere Thunderstorm WarningFSD52 min
May 23, 1:13 AM CDTMesoscale DiscussionSPC92 min
May 25, 2:52 PM CDTMesoscale DiscussionSPC53 min
May 25, 6:10 PM CDTMesoscale DiscussionSPC65 min
May 30, 2:48 PM CDTSevere Thunderstorm WatchSPC7 hr
May 30, 6:37 PM CDTMesoscale DiscussionSPC113 min
Jun 9, 3:07 PM CDTHeat AdvisoryFSD54 hr
Jun 12, 3:36 AM CDTHeat AdvisoryFSD16 hr
Jun 17, 11:13 AM CDTHeat AdvisoryFSD8 hr
Jun 17, 3:06 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 17, 6:13 PM CDTMesoscale DiscussionSPC92 min
Jun 18, 3:14 AM CDTHeat AdvisoryFSD41 hr
Jun 19, 3:38 PM CDTMesoscale DiscussionSPC3 hr
Jun 19, 5:33 PM CDTSevere Thunderstorm WatchSPC5 hr
Jun 21, 9:49 PM CDTMesoscale DiscussionSPC26 min
Jun 21, 10:21 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 22, 2:31 AM CDTMesoscale DiscussionSPC119 min
Jun 22, 4:43 AM CDTMesoscale DiscussionSPC92 min
Jun 29, 5:36 PM CDTMesoscale DiscussionSPC114 min
Jul 5, 2:57 PM CDTMesoscale DiscussionSPC63 min
Jul 5, 3:29 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 5, 5:08 PM CDTMesoscale DiscussionSPC97 min
Jul 6, 6:48 PM CDTMesoscale DiscussionSPC57 min
Jul 6, 7:38 PM CDTSevere Thunderstorm WatchSPC6 hr
Jul 9, 3:07 PM CDTHeat AdvisoryFSD24 hr
Jul 16, 5:09 PM CDTMesoscale DiscussionSPC96 min
Jul 16, 6:57 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 18, 3:57 AM CDTExcessive Heat WatchFSD24 hr
Jul 19, 4:06 AM CDTExcessive Heat WarningFSD5 days
Jul 22, 2:16 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 22, 5:40 PM CDTSevere Thunderstorm WarningFSD50 min
Jul 26, 12:09 PM CDTMesoscale DiscussionSPC96 min
Aug 9, 2:40 PM CDTHeat AdvisoryFSD29 hr
Aug 11, 9:17 PM CDTMesoscale DiscussionSPC58 min
Aug 18, 3:30 PM CDTMesoscale DiscussionSPC2 hr
Aug 18, 9:36 PM CDTMesoscale DiscussionSPC84 min
Aug 18, 10:22 PM CDTSevere Thunderstorm WarningFSD38 min
Sep 4, 4:53 PM CDTSevere Thunderstorm WatchSPC7 hr
Sep 4, 6:56 PM CDTMesoscale DiscussionSPC94 min
Sep 4, 9:16 PM CDTMesoscale DiscussionSPC59 min
Sep 4, 10:40 PM CDTSevere Thunderstorm WatchSPC4 hr
Sep 5, 3:08 PM CDTMesoscale DiscussionSPC2 hr
Sep 5, 3:34 PM CDTFlash Flood WatchFSD15 hr
Oct 6, 2:43 PM CDTFrost AdvisoryFSD18 hr
Oct 6, 2:43 PM CDTFreeze WarningFSD18 hr
Oct 11, 2:59 PM CDTFreeze WatchFSD13 hr
Oct 12, 3:39 AM CDTFreeze WarningFSD29 hr
Nov 16, 3:33 AM CSTWinter Storm WatchFSD24 hr
Nov 17, 3:34 AM CSTWinter Storm WarningFSD38 hr
Nov 18, 2:42 AM CSTMesoscale DiscussionSPC4 hr
Dec 6, 3:36 AM CSTWind AdvisoryFSD17 hr
Dec 9, 11:36 AM CSTWinter Weather AdvisoryFSD43 hr
Dec 14, 3:35 AM CSTWinter Storm WatchFSD32 hr
Dec 15, 4:22 AM CSTWinter Storm WarningFSD56 hr
Dec 16, 4:02 AM CSTWind Chill WarningFSD56 hr
Dec 20, 8:31 PM CSTWind AdvisoryFSD21 hr
Dec 24, 11:26 PM CSTWinter Weather AdvisoryFSD8 hr
Dec 25, 3:07 PM CSTWind AdvisoryFSD27 hr
Dec 25, 8:54 PM CSTHigh Wind WarningFSD18 hr
Dec 25, 8:54 PM CSTWind AdvisoryFSD21 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 archive20152017

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.