Alert archive / South Dakota / Tornado Warnings

Tornado Warnings in South Dakota, 2008

74 tornado warnings in 2008. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of tornado warnings reaches back to 1986.

Tornado Warnings by county

Each county as a circle sized by its count in 2008. Tap one for its archive.

Tornado Warnings
74
Busiest month
May23 tornado warnings
Busiest day
June 27, 20089 tornado warnings

Over time

By month

Warning verification

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

22 of 74 tornado warnings covering South Dakota in 2008 had a tornado report inside them; 29 of 35 tornado reports fell inside a warning, on average 13 minutes after it went out.

South Dakota, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
Tornado warnings742270%3583%13 min

Each office's whole area, 2008

WarningsWith a reportFalse alarm ratioReportsInside a warningMean lead time
NWS Aberdeen, SD: tornado warnings29776%1471%14 min
NWS Sioux Falls, SD: tornado warnings551965%4990%14 min
NWS Rapid City, SD: tornado warnings20860%1173%15 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.

IssuedProductOfficeCountiesLasted
May 1, 6:36 PM CDTTornado WarningFSDTurner24 min
May 1, 6:54 PM CDTTornado WarningFSDLincoln, Minnehaha36 min
May 1, 7:08 PM CDTTornado WarningFSDTurner29 min
May 1, 7:22 PM CDTTornado WarningFSDLincoln, Minnehaha23 min
May 1, 7:25 PM CDTTornado WarningFSDMcCook, Minnehaha, Turner35 min
May 1, 7:45 PM CDTTornado WarningFSDMinnehaha30 min
May 1, 7:59 PM CDTTornado WarningFSDMinnehaha14 min
May 24, 4:11 PM CDTTornado WarningUNRHaakon, Ziebach34 min
May 24, 4:46 PM CDTTornado WarningUNRZiebach44 min
May 24, 5:10 PM CDTTornado WarningABRDewey35 min
May 24, 5:39 PM CDTTornado WarningABRDewey36 min
May 24, 5:59 PM CDTTornado WarningABRHand, Hyde31 min
May 24, 6:10 PM CDTTornado WarningABRDewey35 min
May 24, 6:30 PM CDTTornado WarningABRFaulk, Hand, Spink30 min
May 24, 7:12 PM CDTTornado WarningABRBrown27 min
May 29, 6:05 PM CDTTornado WarningFSDBon Homme25 min
May 29, 6:29 PM CDTTornado WarningFSDBon Homme, Yankton31 min
May 29, 6:35 PM CDTTornado WarningFSDBon Homme25 min
May 29, 6:54 PM CDTTornado WarningFSDYankton24 min
May 29, 7:07 PM CDTTornado WarningFSDClay, Turner23 min
May 29, 7:09 PM CDTTornado WarningFSDClay36 min
May 29, 7:27 PM CDTTornado WarningFSDLincoln, Turner20 min
May 29, 7:28 PM CDTTornado WarningFSDClay, Union22 min
Jun 1, 5:32 PM CDTTornado WarningUNRBennett, Jackson43 min
Jun 1, 6:06 PM CDTTornado WarningUNRBennett40 min
Jun 5, 8:13 PM CDTTornado WarningFSDLake, Minnehaha32 min
Jun 5, 8:22 PM CDTTornado WarningFSDLincoln, Minnehaha, Turner23 min
Jun 5, 8:28 PM CDTTornado WarningFSDLake, Minnehaha, Moody32 min
Jun 5, 8:40 PM CDTTornado WarningFSDMinnehaha, Moody20 min
Jun 5, 8:56 PM CDTTornado WarningFSDMoody34 min
Jun 10, 7:58 PM CDTTornado WarningUNRLawrence, Pennington32 min
Jun 11, 3:58 PM CDTTornado WarningFSDUnion32 min
Jun 17, 6:08 PM CDTTornado WarningUNRLawrence, Pennington25 min
Jun 17, 6:50 PM CDTTornado WarningUNRCuster, Fall River40 min
Jun 17, 7:11 PM CDTTornado WarningUNRCuster, Fall River49 min
Jun 17, 7:23 PM CDTTornado WarningUNRFall River52 min
Jun 24, 9:50 PM CDTTornado WarningABREdmunds, Walworth25 min
Jun 26, 7:38 PM CDTTornado WarningABRCorson, Dewey37 min
Jun 26, 8:21 PM CDTTornado WarningABRDewey39 min
Jun 26, 8:27 PM CDTTornado WarningABRDewey33 min
Jun 26, 8:56 PM CDTTornado WarningABRDewey, Potter34 min
Jun 26, 9:00 PM CDTTornado WarningABRDewey30 min
Jun 26, 9:25 PM CDTTornado WarningABRDewey, Potter, Sully50 min
Jun 26, 10:14 PM CDTTornado WarningABRHyde, Sully46 min
Jun 27, 12:21 AM CDTTornado WarningFSDJerauld24 min
Jun 27, 1:59 AM CDTTornado WarningFSDHutchinson, McCook, Turner13 min
Jul 6, 4:41 PM CDTTornado WarningFSDUnion34 min
Jul 6, 5:32 PM CDTTornado WarningFSDAurora, Davison, Hanson28 min
Jul 17, 8:49 PM CDTTornado WarningABREdmunds, Faulk26 min
Jul 17, 9:35 PM CDTTornado WarningABRFaulk, Hand25 min
Jul 17, 9:57 PM CDTTornado WarningABRHand33 min
Jul 17, 10:29 PM CDTTornado WarningABRHand31 min
Jul 19, 3:15 PM CDTTornado WarningFSDLincoln30 min
Jul 23, 6:21 PM CDTTornado WarningABRDewey24 min
Jul 23, 6:54 PM CDTTornado WarningUNRFall River51 min
Jul 23, 6:56 PM CDTTornado WarningABRDewey34 min
Jul 26, 10:24 PM CDTTornado WarningUNRHaakon, Ziebach26 min
Jul 28, 5:38 PM CDTTornado WarningUNRZiebach52 min
Jul 28, 6:18 PM CDTTornado WarningUNRZiebach23 min
Jul 28, 7:01 PM CDTTornado WarningABRLyman29 min
Jul 28, 7:03 PM CDTTornado WarningUNRTripp27 min
Jul 28, 7:30 PM CDTTornado WarningABRLyman30 min
Jul 28, 7:32 PM CDTTornado WarningUNRTripp43 min
Jul 28, 7:55 PM CDTTornado WarningFSDGregory50 min
Jul 28, 8:06 PM CDTTornado WarningUNRTripp39 min
Jul 28, 8:24 PM CDTTornado WarningFSDBrule, Charles Mix34 min
Jul 28, 8:47 PM CDTTornado WarningABRBuffalo, Lyman28 min
Jul 30, 7:39 PM CDTTornado WarningFSDGregory36 min
Jul 30, 7:50 PM CDTTornado WarningABRLyman25 min
Aug 11, 3:56 PM CDTTornado WarningABREdmunds, Faulk, Spink49 min
Aug 11, 4:12 PM CDTTornado WarningABRHand, Hyde33 min
Aug 11, 4:43 PM CDTTornado WarningABREdmunds, Faulk, Spink47 min
Aug 14, 4:53 PM CDTTornado WarningABRHyde12 min
Sep 28, 4:25 PM CDTTornado WarningABRHand24 min

By county

Every county with at least one alert. A county page lists each alert that covered it.

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force nowTornadoes on recordThe radar archive20072009

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.