Union County, South Dakota: tornado and severe weather warnings

A freeze warning is in effect for Union County as of 4:10 PM CDT.

Open the live map on Union County Get a message when a warning reaches your address

The map shows radar, every warning shape, and the path and arrival time of each storm cell headed toward the center of Union County. Tap your own street on it for times that apply to you.

The last 12 months in Union County

• 1 tornado warnings
• 26 severe thunderstorm warnings
• 4 flash flood warnings
• 2 tornado watches
• 14 severe thunderstorm watches

The most recent tornado warning that included Union County was issued May 31, 2026 by the Weather Service office in Sioux Falls, SD.

A warning counts here if the Weather Service listed Union County in it, even if the warned area covered only part of the county.

Nearby

• Clay County, SD
• Plymouth County, IA
• Dixon County, NE
• Sioux County, IA
• Dakota County, NE
• Lincoln County, SD
• Cedar County, NE
• Yankton County, SD
• All of South Dakota

Alerts come from the National Weather Service and refresh every minute. Past warnings come from the Iowa Environmental Mesonet's archive of Weather Service products. During a warning, also listen to local radio, TV or a weather radio.