Alert archive / South Dakota / McCook County

Weather alerts in McCook County, South Dakota, 2018

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

McCook County and its neighbors

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

Alerts
91
Warnings
23
Watches
14
Advisories
36
Busiest month
June14 alerts
Busiest day
August 5, 20186 alerts

Over time

By month

Warning verification

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

0 of 1 tornado warnings covering McCook County in 2018 had a tornado report inside them.

McCook County, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings10100%0
Severe thunderstorm warnings10550%475%6 min
Flash flood warnings220%0

Each office's whole area, 2018

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings12375%1040%9 min
NWS Sioux Falls, SD: severe thunderstorm warnings1657753%15781%19 min
NWS Sioux Falls, SD: flash flood warnings433128%6682%104 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, 12:01 PM CSTWind Chill AdvisoryFSD22 hr
Jan 9, 3:46 AM CSTWinter Storm WatchFSD35 hr
Jan 10, 3:07 AM CSTWinter Weather AdvisoryFSD38 hr
Jan 11, 12:12 PM CSTWind Chill AdvisoryFSD22 hr
Jan 14, 3:20 AM CSTWind Chill AdvisoryFSD56 hr
Jan 19, 4:20 AM CSTWinter Storm WatchFSD47 hr
Jan 20, 2:54 PM CSTWinter Storm WarningFSD54 hr
Jan 21, 3:41 AM CSTWinter Weather AdvisoryFSD38 hr
Jan 24, 1:03 AM CSTDense Fog AdvisoryFSD13 hr
Jan 24, 2:32 PM CSTDense Fog AdvisoryFSD23 hr
Feb 7, 3:41 PM CSTWinter Weather AdvisoryFSD35 hr
Feb 18, 3:39 PM CSTWinter Weather AdvisoryFSD42 hr
Feb 20, 2:06 PM CSTWind Chill AdvisoryFSD20 hr
Feb 21, 2:59 PM CSTWinter Weather AdvisoryFSD33 hr
Feb 23, 3:00 PM CSTWinter Weather AdvisoryFSD27 hr
Feb 23, 10:16 PM CSTDense Fog AdvisoryFSD11 hr
Mar 3, 4:20 AM CSTWinter Storm WatchFSD34 hr
Mar 4, 4:09 AM CSTBlizzard WarningFSD59 hr
Mar 10, 8:54 AM CSTWinter Weather AdvisoryFSD3 hr
Mar 15, 3:48 AM CDTWinter Weather AdvisoryFSD45 hr
Mar 30, 3:05 PM CDTWind AdvisoryFSD22 hr
Apr 2, 2:20 PM CDTWinter Weather AdvisoryFSD31 hr
Apr 7, 2:53 PM CDTWinter Weather AdvisoryFSD34 hr
Apr 11, 3:37 PM CDTWinter Storm WatchFSD24 hr
Apr 12, 3:45 PM CDTBlizzard WarningFSD60 hr
Apr 13, 12:27 PM CDTSevere Thunderstorm WarningFSD48 min
Apr 14, 10:06 AM CDTMesoscale DiscussionSPC6 hr
Apr 17, 3:33 AM CDTWinter Weather AdvisoryFSD38 hr
Apr 29, 3:41 AM CDTWind AdvisoryFSD16 hr
Apr 30, 5:40 PM CDTSevere Thunderstorm WatchSPC5 hr
Apr 30, 8:13 PM CDTMesoscale DiscussionSPC92 min
Apr 30, 8:53 PM CDTSevere Thunderstorm WarningFSD37 min
May 15, 1:41 AM CDTDense Fog AdvisoryFSD7 hr
May 24, 2:36 PM CDTMesoscale DiscussionSPC2 hr
May 25, 5:20 PM CDTMesoscale DiscussionSPC115 min
May 25, 6:29 PM CDTMesoscale DiscussionSPC2 hr
Jun 1, 9:34 PM CDTSevere Thunderstorm WarningFSD41 min
Jun 8, 5:55 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 8, 11:51 PM CDTMesoscale DiscussionSPC84 min
Jun 13, 11:56 PM CDTMesoscale DiscussionSPC3 hr
Jun 17, 3:52 PM CDTMesoscale DiscussionSPC53 min
Jun 17, 5:47 PM CDTMesoscale DiscussionSPC118 min
Jun 20, 9:46 PM CDTAreal Flood WarningFSD24 hr
Jun 21, 1:07 PM CDTAreal Flood WarningFSD24 hr
Jun 23, 8:21 PM CDTSevere Thunderstorm WarningFSD24 min
Jun 24, 9:52 PM CDTFlash Flood WatchFSD25 hr
Jun 27, 4:18 AM CDTMesoscale DiscussionSPC87 min
Jun 27, 4:34 AM CDTSevere Thunderstorm WatchSPC5 hr
Jun 27, 7:25 AM CDTMesoscale DiscussionSPC95 min
Jun 28, 3:17 AM CDTHeat AdvisoryFSD41 hr
Jul 10, 2:39 PM CDTHeat AdvisoryFSD53 hr
Jul 12, 4:47 AM CDTFlash Flood WatchFSD26 hr
Jul 12, 2:47 PM CDTMesoscale DiscussionSPC2 hr
Jul 12, 3:24 PM CDTSevere Thunderstorm WatchSPC7 hr
Jul 12, 6:36 PM CDTMesoscale DiscussionSPC84 min
Jul 12, 7:23 PM CDTFlash Flood WarningFSD3 hr
Jul 12, 9:46 PM CDTFlash Flood WarningFSD6 hr
Aug 3, 4:05 PM CDTMesoscale DiscussionSPC55 min
Aug 4, 11:39 PM CDTMesoscale DiscussionSPC2 hr
Aug 5, 12:52 AM CDTSevere Thunderstorm WarningFSD23 min
Aug 5, 1:00 AM CDTSevere Thunderstorm WatchSPC4 hr
Aug 5, 1:08 AM CDTSevere Thunderstorm WarningFSD52 min
Aug 5, 1:36 AM CDTTornado WarningFSD24 min
Aug 5, 1:41 AM CDTSevere Thunderstorm WarningFSD34 min
Aug 27, 11:49 AM CDTMesoscale DiscussionSPC116 min
Aug 28, 1:07 AM CDTSevere Thunderstorm WarningFSD38 min
Aug 28, 1:43 AM CDTSevere Thunderstorm WarningFSD47 min
Aug 28, 3:20 AM CDTSevere Thunderstorm WarningFSD40 min
Sep 18, 2:48 AM CDTMesoscale DiscussionSPC2 hr
Sep 19, 2:40 AM CDTMesoscale DiscussionSPC3 hr
Sep 19, 10:31 AM CDTFlash Flood WatchFSD26 hr
Oct 3, 10:18 AM CDTWind AdvisoryFSD11 hr
Oct 3, 3:30 PM CDTFrost AdvisoryFSD18 hr
Oct 3, 3:30 PM CDTFreeze WarningFSD18 hr
Oct 10, 3:18 PM CDTFreeze WarningFSD18 hr
Oct 11, 3:35 AM CDTFreeze WarningFSD29 hr
Nov 16, 3:26 AM CSTWinter Weather AdvisoryFSD25 hr
Nov 22, 4:24 AM CSTDense Fog AdvisoryFSD7 hr
Nov 28, 4:05 AM CSTWinter Weather AdvisoryFSD17 hr
Nov 28, 2:25 PM CSTWinter Storm WatchFSD48 hr
Nov 29, 2:45 PM CSTWinter Storm WarningFSD69 hr
Nov 29, 9:09 PM CSTDense Fog AdvisoryFSD15 hr
Nov 30, 2:46 PM CSTWinter Weather AdvisoryFSD43 hr
Dec 8, 2:00 AM CSTDense Fog AdvisoryFSD10 hr
Dec 19, 7:06 AM CSTDense Fog AdvisoryFSD5 hr
Dec 21, 5:01 AM CSTDense Fog AdvisoryFSD5 hr
Dec 25, 3:17 AM CSTWinter Storm WatchFSD24 hr
Dec 25, 3:17 PM CSTWinter Storm WarningFSD69 hr
Dec 26, 3:25 AM CSTWinter Weather AdvisoryFSD57 hr
Dec 28, 2:32 PM CSTWind Chill AdvisoryFSD18 hr
Dec 30, 3:33 PM CSTWinter Weather AdvisoryFSD29 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.