Alert archive / South Dakota / McCook County

Weather alerts in McCook County, South Dakota, 2011

86 weather alerts in 2011, 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 2011. Tap one for its archive.

Alerts
86
Warnings
29
Watches
12
Advisories
30
Busiest month
July18 alerts
Busiest day
August 28, 20117 alerts

Over time

By month

Warning verification

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

1 of 3 tornado warnings covering McCook County in 2011 had a tornado report inside them.

McCook County, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings3167%0
Severe thunderstorm warnings201715%1553%23 min
Flash flood warnings00

Each office's whole area, 2011

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Sioux Falls, SD: tornado warnings381074%1573%12 min
NWS Sioux Falls, SD: severe thunderstorm warnings27418732%33789%19 min
NWS Sioux Falls, SD: flash flood warnings362628%5491%61 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, 3:28 AM CSTBlizzard WarningFSD13 hr
Jan 8, 2:24 PM CSTWinter Weather AdvisoryFSD64 hr
Jan 11, 3:14 PM CSTWind Chill AdvisoryFSD19 hr
Jan 16, 9:45 PM CSTWinter Weather AdvisoryFSD6 hr
Jan 28, 9:09 AM CSTDense Fog AdvisoryFSD3 hr
Jan 29, 3:39 PM CSTWinter Weather AdvisoryFSD3 days
Jan 31, 3:17 PM CSTWind Chill WarningFSD45 hr
Feb 2, 2:58 PM CSTWind Chill AdvisoryFSD15 hr
Feb 5, 10:26 AM CSTFreezing Rain AdvisoryFSD106 min
Feb 7, 3:48 AM CSTWind Chill AdvisoryFSD32 hr
Feb 8, 2:37 PM CSTWind Chill AdvisoryFSD21 hr
Feb 12, 2:41 PM CSTWind AdvisoryFSD36 hr
Feb 18, 4:18 AM CSTWinter Storm WatchFSD35 hr
Feb 19, 4:07 AM CSTWinter Storm WarningFSD41 hr
Feb 19, 11:25 PM CSTMesoscale DiscussionSPC5 hr
Feb 20, 4:36 AM CSTMesoscale DiscussionSPC4 hr
Feb 20, 3:25 PM CSTWinter Weather AdvisoryFSD12 hr
Mar 10, 3:56 AM CSTDense Fog AdvisoryFSD7 hr
Mar 11, 4:00 AM CSTWind AdvisoryFSD32 hr
Mar 16, 10:06 PM CDTRiver Flood WarningFSD6 days
Mar 21, 10:05 PM CDTMesoscale DiscussionSPC115 min
Apr 3, 4:17 AM CDTWind AdvisoryFSD36 hr
Apr 9, 6:57 PM CDTMesoscale DiscussionSPC63 min
Apr 9, 7:47 PM CDTSevere Thunderstorm WatchSPC3 hr
Apr 9, 8:11 PM CDTSevere Thunderstorm WarningFSD34 min
Apr 9, 8:45 PM CDTSevere Thunderstorm WarningFSD45 min
Apr 29, 3:12 AM CDTWind AdvisoryFSD16 hr
Apr 29, 9:11 PM CDTWind AdvisoryFSD28 hr
May 1, 3:55 AM CDTWind AdvisoryFSD13 hr
May 15, 3:18 PM CDTFrost AdvisoryFSD17 hr
May 21, 12:51 PM CDTMesoscale DiscussionSPC114 min
May 24, 3:30 PM CDTWind AdvisoryFSD27 hr
May 29, 3:54 PM CDTWind AdvisoryFSD27 hr
May 29, 10:58 PM CDTSevere Thunderstorm WatchSPC6 hr
May 30, 1:40 PM CDTMesoscale DiscussionSPC95 min
May 30, 2:08 PM CDTTornado WatchSPC7 hr
May 30, 6:17 PM CDTMesoscale DiscussionSPC118 min
May 30, 7:42 PM CDTTornado WarningFSD33 min
May 30, 8:05 PM CDTTornado WarningFSD25 min
May 31, 3:48 AM CDTWind AdvisoryFSD15 hr
Jun 16, 3:51 PM CDTFlash Flood WatchFSD29 hr
Jun 19, 3:40 AM CDTFlash Flood WatchFSD55 hr
Jun 20, 6:53 PM CDTTornado WatchSPC6 hr
Jun 20, 8:33 PM CDTSevere Thunderstorm WarningFSD27 min
Jun 20, 8:58 PM CDTSevere Thunderstorm WarningFSD32 min
Jun 20, 9:02 PM CDTMesoscale DiscussionSPC58 min
Jun 29, 3:18 PM CDTHeat AdvisoryFSD28 hr
Jul 1, 12:59 PM CDTMesoscale DiscussionSPC61 min
Jul 1, 2:08 PM CDTSevere Thunderstorm WatchSPC9 hr
Jul 1, 2:14 PM CDTSevere Thunderstorm WarningFSD46 min
Jul 1, 2:18 PM CDTSevere Thunderstorm WarningFSD42 min
Jul 1, 2:42 PM CDTSevere Thunderstorm WarningFSD63 min
Jul 4, 11:14 PM CDTMesoscale DiscussionSPC91 min
Jul 4, 11:41 PM CDTSevere Thunderstorm WatchSPC5 hr
Jul 9, 11:58 PM CDTSevere Thunderstorm WarningFSD47 min
Jul 10, 12:19 AM CDTSevere Thunderstorm WarningFSD26 min
Jul 10, 1:03 AM CDTMesoscale DiscussionSPC117 min
Jul 15, 3:42 AM CDTExcessive Heat WarningFSD6 days
Jul 22, 3:00 PM CDTMesoscale DiscussionSPC90 min
Jul 22, 3:01 PM CDTHeat AdvisoryFSD29 hr
Jul 26, 8:17 PM CDTSevere Thunderstorm WatchSPC8 hr
Jul 26, 11:42 PM CDTSevere Thunderstorm WarningFSD33 min
Jul 27, 12:16 AM CDTSevere Thunderstorm WarningFSD44 min
Jul 30, 3:33 PM CDTHeat AdvisoryFSD52 hr
Jul 31, 12:50 PM CDTMesoscale DiscussionSPC2 hr
Aug 11, 7:19 PM CDTSevere Thunderstorm WatchSPC5 hr
Aug 11, 7:29 PM CDTSevere Thunderstorm WarningFSD46 min
Aug 11, 9:42 PM CDTMesoscale DiscussionSPC63 min
Aug 22, 9:43 PM CDTSevere Thunderstorm WarningFSD47 min
Aug 22, 10:17 PM CDTSevere Thunderstorm WarningFSD43 min
Aug 22, 11:11 PM CDTTornado WarningFSD34 min
Aug 28, 5:16 AM CDTMesoscale DiscussionSPC2 hr
Aug 28, 5:49 AM CDTSevere Thunderstorm WarningFSD41 min
Aug 28, 6:30 AM CDTSevere Thunderstorm WarningFSD45 min
Aug 28, 6:58 AM CDTSevere Thunderstorm WarningFSD47 min
Aug 28, 8:00 AM CDTSevere Thunderstorm WarningFSD60 min
Aug 28, 8:00 AM CDTSevere Thunderstorm WatchSPC5 hr
Aug 28, 8:24 AM CDTSevere Thunderstorm WarningFSD51 min
Sep 13, 3:12 PM CDTFreeze WarningFSD41 hr
Sep 19, 3:28 PM CDTWind AdvisoryFSD34 hr
Oct 4, 3:13 PM CDTWind AdvisoryFSD3 days
Oct 11, 9:58 PM CDTSevere Thunderstorm WarningFSD32 min
Nov 4, 3:37 AM CDTWind AdvisoryFSD47 hr
Nov 15, 3:26 AM CSTWind AdvisoryFSD14 hr
Nov 25, 4:30 AM CSTWind AdvisoryFSD41 hr
Dec 30, 3:15 PM CSTWind AdvisoryFSD57 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 archive20102012

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.