Flash Flood Warnings in South Dakota, 2014

By month

37 of 57 flash flood warnings covering South Dakota in 2014 had a flash flood report inside them; 46 of 48 flash flood reports fell inside a warning, on average 101 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.

• Minnehaha County9
• Lincoln County8
• Edmunds County5
• Brookings County5
• Hand County4
• Moody County4
• Deuel County4
• Hamlin County4
• Turner County4
• Corson County4
• Dewey County4
• Roberts County4
• Faulk County3
• Davison County3
• Douglas County3
• McCook County3
• Campbell County3
• McPherson County3
• Spink County3
• Day County3
• Hyde County2
• Meade County2
• Hutchinson County2
• Lake County2
• Union County2
• Walworth County2
• Brown County2
• Clark County2
• Marshall County2
• Grant County2
• Perkins County2
• Aurora County2
• Charles Mix County2
• Hughes County1
• Sully County1
• Hanson County1
• Jackson County1
• Miner County1
• Clay County1
• Yankton County1

1. June 16, 20147flash flood warnings
2. June 1, 20146flash flood warnings
3. June 19, 20146flash flood warnings
4. May 30, 20144flash flood warnings
5. June 28, 20144flash flood warnings
6. August 24, 20144flash flood warnings
7. June 15, 20143flash flood warnings
8. June 18, 20143flash flood warnings
9. August 9, 20143flash flood warnings
10. August 10, 20143flash flood warnings
11. August 15, 20143flash flood warnings
12. June 22, 20142flash flood 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.