During the afternoon hours, a line of storms along a boundary moved east-northeast across northeastern South Dakota. The storms produced locally heavy rainfall, straight-line winds of 60 to 75 mph, and three tornadoes. The tornadoes were only briefly on the ground and caused EF-0 damage. More tornado warnings were issued by NWS Aberdeen on this one day, 12, than any previous monthly total in August, September, or October since at least 1986 when record keeping began.

Tornado in DAY, SOUTH DAKOTA
From 09-OCT-21 16:31:00 to 09-OCT-21 16:31:00 (CST-6)
Location: ROSLYN
Tornado F-scale: EF0
Reported by: Fire Department/Rescue

The fire department reported a brief tornado touchdown.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 09-OCT-21 17:35:00 to 09-OCT-21 17:35:00 (CST-6)
Location: ROSLYN
Magnitude: 56.00 EG
Reported by: Fire Department/Rescue

The fire department reported trees down in Roslyn due to 60 to 70 mph estimated winds.

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 09-OCT-21 16:10:00 to 09-OCT-21 16:10:00 (CST-6)
Location: ANDOVER
Magnitude: 57.00 MG
Crop damage: 0.00K
Reported by: Mesonet

Thunderstorm Wind in ROBERTS, SOUTH DAKOTA
From 09-OCT-21 17:36:00 to 09-OCT-21 17:36:00 (CST-6)
Location: PEEVER
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

A 30-foot trailer pulled by a pickup truck was overturned on Interstate-29 by estimated 70 mph winds.

Tornado in SPINK, SOUTH DAKOTA
From 09-OCT-21 15:12:00 to 09-OCT-21 15:14:00 (CST-6)
Location: BRENTFORD
Tornado F-scale: EF0
Reported by: Trained Spotter

The tornado briefly touched down in an open field, rolling 12 large hay bales, some of them over a fence. The tornado also was visibile as a tornadic debris signature on radar due to the lofting of corn stubble into the air. The track of the tornado was also visible on high resolution satellite data several days after the event.

Thunderstorm Wind in SPINK, SOUTH DAKOTA
From 09-OCT-21 15:25:00 to 09-OCT-21 15:25:00 (CST-6)
Location: CONDE
Magnitude: 65.00 EG
Reported by: Trained Spotter

A trained spotter estimated wind gusts of 75 mph.

Tornado in MARSHALL, SOUTH DAKOTA
From 09-OCT-21 16:12:00 to 09-OCT-21 16:12:00 (CST-6)
Location: LANGFORD
Tornado F-scale: EF0
Reported by: Emergency Manager

The tornado touched down very briefly.

Thunderstorm Wind in HAMLIN, SOUTH DAKOTA
From 09-OCT-21 17:15:00 to 09-OCT-21 17:15:00 (CST-6)
Location: BRYANT
Magnitude: 56.00 EG
Reported by: Public

Tree damage was reported in Bryant by estimated 65 mph winds.

Thunderstorm Wind in CLARK, SOUTH DAKOTA
From 09-OCT-21 16:29:00 to 09-OCT-21 16:29:00 (CST-6)
Location: ELROD
Magnitude: 50.00 MG
Reported by: Mesonet

Funnel Cloud in DAY, SOUTH DAKOTA
From 09-OCT-21 17:05:00 to 09-OCT-21 17:05:00 (CST-6)
Location: WAUBAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HAMLIN, SOUTH DAKOTA
From 09-OCT-21 17:28:00 to 09-OCT-21 17:28:00 (CST-6)
Location: HAYTI
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HAMLIN, SOUTH DAKOTA
From 09-OCT-21 17:38:00 to 09-OCT-21 17:38:00 (CST-6)
Location: THOMAS
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DAY, SOUTH DAKOTA
From 09-OCT-21 16:35:00 to 09-OCT-21 16:35:00 (CST-6)
Location: ROSLYN
Magnitude: 61.00 EG
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Several trees were downed by estimated 70 mph winds.