Tornado Warnings in South Dakota, 2014

By month

23 of 43 tornado warnings covering South Dakota in 2014 had a tornado report inside them; 41 of 54 tornado reports fell inside a warning, on average 17 minutes after it went out.

South Dakota, 2014

Each office's whole area, 2014

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.

• Beadle County6
• Hand County5
• Minnehaha County5
• Jerauld County5
• Edmunds County4
• Hyde County3
• Sanborn County3
• McPherson County3
• Yankton County3
• Lincoln County2
• Union County2
• Butte County2
• Buffalo County2
• Aurora County2
• Haakon County2
• Faulk County2
• Deuel County2
• Brookings County1
• Pennington County1
• Fall River County1
• Marshall County1
• Harding County1
• Brule County1
• Brown County1
• Dewey County1
• Hamlin County1
• Turner County1
• McCook County1
• Day County1

1. June 19, 20149tornado warnings
2. June 18, 20148tornado warnings
3. June 5, 20144tornado warnings
4. August 23, 20143tornado warnings
5. June 16, 20142tornado warnings
6. June 22, 20142tornado warnings
7. August 9, 20142tornado warnings
8. August 29, 20142tornado warnings
9. September 30, 20142tornado warnings
10. March 31, 20141tornado warnings
11. May 27, 20141tornado warnings
12. May 30, 20141tornado warnings

Alerts in force nowTornadoes on recordThe radar archive20132015

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.