Alert archive / South Dakota / McCook County

Weather alerts in McCook County, South Dakota, 2012

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

Alerts
100
Warnings
30
Watches
14
Advisories
36
Busiest month
May34 alerts
Busiest day
May 6, 201211 alerts

Over time

By month

Warning verification

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

McCook County, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings00
Severe thunderstorm warnings231917%1593%23 min
Flash flood warnings00

Each office's whole area, 2012

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings21767%1573%12 min
NWS Sioux Falls, SD: severe thunderstorm warnings23017424%34292%19 min
NWS Sioux Falls, SD: flash flood warnings16756%1191%103 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 10, 2:38 PM CSTWind AdvisoryFSD27 hr
Jan 22, 3:30 AM CSTWinter Weather AdvisoryFSD27 hr
Jan 25, 8:27 AM CSTDense Fog AdvisoryFSD4 hr
Feb 15, 5:19 AM CSTWinter Weather AdvisoryFSD5 hr
Feb 19, 3:43 PM CSTWinter Weather AdvisoryFSD29 hr
Feb 22, 11:03 AM CSTWinter Storm WatchFSD5 hr
Feb 22, 4:02 PM CSTWinter Storm WarningFSD29 hr
Feb 22, 4:02 PM CSTWinter Weather AdvisoryFSD7 hr
Feb 25, 8:49 PM CSTWind AdvisoryFSD21 hr
Feb 26, 4:06 AM CSTWinter Storm WatchFSD23 hr
Feb 27, 3:25 AM CSTWinter Weather AdvisoryFSD57 hr
Feb 28, 2:30 PM CSTWind AdvisoryFSD28 hr
Mar 1, 4:41 AM CSTDense Fog AdvisoryFSD5 hr
Mar 3, 2:50 PM CSTWind AdvisoryFSD27 hr
Mar 23, 1:28 AM CDTDense Fog AdvisoryFSD9 hr
Mar 26, 3:28 AM CDTWind AdvisoryFSD40 hr
Apr 1, 3:22 AM CDTDense Fog AdvisoryFSD7 hr
Apr 1, 3:22 AM CDTWind AdvisoryFSD42 hr
Apr 7, 3:15 AM CDTWind AdvisoryFSD16 hr
Apr 8, 2:05 PM CDTFreeze WatchFSD14 hr
Apr 9, 3:38 AM CDTFreeze WarningFSD29 hr
Apr 9, 7:41 PM CDTFreeze WarningFSD37 hr
Apr 14, 3:28 PM CDTWind AdvisoryFSD28 hr
Apr 14, 7:51 PM CDTMesoscale DiscussionSPC84 min
Apr 15, 12:25 PM CDTMesoscale DiscussionSPC65 min
Apr 15, 5:10 PM CDTHigh Wind WarningFSD11 hr
Apr 16, 3:33 PM CDTFrost AdvisoryFSD16 hr
Apr 27, 10:41 AM CDTWind AdvisoryFSD11 hr
May 1, 2:30 PM CDTMesoscale DiscussionSPC60 min
May 1, 2:59 PM CDTTornado WatchSPC6 hr
May 1, 4:03 PM CDTSevere Thunderstorm WarningFSD27 min
May 1, 6:11 PM CDTMesoscale DiscussionSPC94 min
May 1, 6:29 PM CDTSevere Thunderstorm WarningFSD46 min
May 4, 1:57 PM CDTSevere Thunderstorm WarningFSD33 min
May 4, 3:52 PM CDTMesoscale DiscussionSPC53 min
May 4, 4:36 PM CDTSevere Thunderstorm WarningFSD18 min
May 5, 6:49 AM CDTSevere Thunderstorm WatchSPC7 hr
May 5, 9:08 AM CDTSevere Thunderstorm WarningFSD37 min
May 5, 9:35 AM CDTSevere Thunderstorm WarningFSD25 min
May 5, 9:40 AM CDTSevere Thunderstorm WarningFSD35 min
May 5, 9:50 AM CDTMesoscale DiscussionSPC55 min
May 5, 9:53 AM CDTSevere Thunderstorm WarningFSD37 min
May 5, 10:11 AM CDTSevere Thunderstorm WarningFSD34 min
May 5, 3:06 PM CDTFlash Flood WatchFSD13 hr
May 5, 6:21 PM CDTMesoscale DiscussionSPC84 min
May 5, 6:46 PM CDTSevere Thunderstorm WatchSPC6 hr
May 5, 7:05 PM CDTSevere Thunderstorm WarningFSD25 min
May 5, 7:29 PM CDTSevere Thunderstorm WarningFSD46 min
May 5, 8:11 PM CDTSevere Thunderstorm WarningFSD49 min
May 5, 8:57 PM CDTSevere Thunderstorm WarningFSD48 min
May 5, 9:42 PM CDTSevere Thunderstorm WarningFSD48 min
May 5, 11:08 PM CDTSevere Thunderstorm WarningFSD37 min
May 5, 11:31 PM CDTMesoscale DiscussionSPC89 min
May 5, 11:45 PM CDTSevere Thunderstorm WarningFSD45 min
May 6, 12:22 AM CDTSevere Thunderstorm WarningFSD38 min
May 6, 1:08 AM CDTAreal Flood WarningFSD33 hr
May 6, 8:24 AM CDTRiver Flood WarningFSD4 days
May 10, 9:33 PM CDTWind AdvisoryFSD6 hr
May 21, 2:51 PM CDTWind AdvisoryFSD29 hr
May 23, 2:04 PM CDTMesoscale DiscussionSPC86 min
May 26, 5:44 AM CDTSevere Thunderstorm WarningFSD46 min
May 27, 3:42 PM CDTSevere Thunderstorm WatchSPC8 hr
Jun 18, 9:11 PM CDTMesoscale DiscussionSPC94 min
Jun 19, 7:01 PM CDTSevere Thunderstorm WatchSPC7 hr
Jun 19, 9:12 PM CDTMesoscale DiscussionSPC93 min
Jun 23, 1:18 AM CDTMesoscale DiscussionSPC87 min
Jun 29, 7:59 AM CDTMesoscale DiscussionSPC91 min
Jul 1, 3:24 PM CDTHeat AdvisoryFSD5 days
Jul 6, 6:02 PM CDTMesoscale DiscussionSPC28 min
Jul 13, 3:42 PM CDTHeat AdvisoryFSD3 days
Jul 17, 3:31 PM CDTHeat AdvisoryFSD28 hr
Jul 18, 3:54 PM CDTHeat AdvisoryFSD6 days
Jul 21, 10:51 PM CDTMesoscale DiscussionSPC54 min
Jul 22, 10:58 PM CDTMesoscale DiscussionSPC107 min
Aug 1, 3:52 AM CDTHeat AdvisoryFSD15 hr
Aug 3, 2:14 PM CDTSevere Thunderstorm WatchSPC7 hr
Aug 3, 6:19 PM CDTMesoscale DiscussionSPC86 min
Aug 3, 7:33 PM CDTSevere Thunderstorm WatchSPC6 hr
Aug 3, 7:46 PM CDTSevere Thunderstorm WarningFSD44 min
Aug 15, 2:56 PM CDTMesoscale DiscussionSPC64 min
Aug 26, 2:25 AM CDTDense Fog AdvisoryFSD9 hr
Sep 2, 3:49 PM CDTMesoscale DiscussionSPC56 min
Sep 3, 4:03 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 4, 7:27 PM CDTMesoscale DiscussionSPC63 min
Sep 4, 7:45 PM CDTSevere Thunderstorm WatchSPC6 hr
Sep 4, 7:49 PM CDTSevere Thunderstorm WarningFSD41 min
Sep 4, 8:27 PM CDTSevere Thunderstorm WarningFSD33 min
Sep 4, 8:52 PM CDTSevere Thunderstorm WarningFSD38 min
Sep 17, 3:09 PM CDTFrost AdvisoryFSD17 hr
Sep 21, 3:41 PM CDTFreeze WatchFSD11 hr
Sep 22, 3:09 AM CDTFreeze WarningFSD29 hr
Oct 3, 3:32 PM CDTWind AdvisoryFSD26 hr
Oct 16, 2:46 PM CDTWind AdvisoryFSD61 hr
Oct 16, 2:46 PM CDTWind AdvisoryFSD61 hr
Nov 21, 4:11 AM CSTWind AdvisoryFSD50 hr
Dec 8, 3:18 PM CSTBlizzard WarningFSD30 hr
Dec 8, 3:18 PM CSTWinter Weather AdvisoryFSD30 hr
Dec 18, 5:11 AM CSTWinter Weather AdvisoryFSD7 hr
Dec 24, 3:05 AM CSTWind Chill AdvisoryFSD33 hr
Dec 26, 3:31 PM CSTWinter Weather AdvisoryFSD36 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.