Tornado Warnings in South Dakota, 2019

By month

15 of 51 tornado warnings covering South Dakota in 2019 had a tornado report inside them; 19 of 28 tornado reports fell inside a warning, on average 11 minutes after it went out.

South Dakota, 2019

Each office's whole area, 2019

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.

• Gregory County9
• Charles Mix County6
• Hutchinson County6
• Bennett County5
• Custer County4
• Turner County4
• Minnehaha County4
• Fall River County3
• Douglas County3
• Pennington County3
• Day County3
• McCook County3
• Brookings County2
• Moody County2
• Lawrence County2
• Todd County2
• Bon Homme County2
• Lincoln County2
• Tripp County1
• Oglala Lakota County1
• Clay County1
• Union County1
• Hughes County1
• Beadle County1
• Kingsbury County1
• Miner County1
• Sanborn County1
• Hand County1
• Hyde County1
• Roberts County1
• Aurora County1
• Davison County1
• Hanson County1

1. September 11, 201911tornado warnings
2. June 30, 20197tornado warnings
3. July 3, 20195tornado warnings
4. July 17, 20195tornado warnings
5. July 5, 20194tornado warnings
6. August 10, 20193tornado warnings
7. September 10, 20193tornado warnings
8. June 15, 20192tornado warnings
9. June 29, 20192tornado warnings
10. August 17, 20192tornado warnings
11. June 20, 20191tornado warnings
12. July 18, 20191tornado warnings

Alerts in force nowTornadoes on recordThe radar archive20182020

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.