Risk of Thunderstorms Tuesday Afternoon and Evening

Event Overview:  Strong to severe storms are expected Tuesday afternoon and evening. Large hail, damaging winds, and even a few tornadoes may be possible.  These storms will slowly move east Tuesday evening, and the severe weather risk should diminish by midnight.  The prime time for severe storms will be between 4pm and 12am. 

Latest Hazardous Weather Outlook

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HWOFSD

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
156 PM CDT Wed Oct 21 2026

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156 PM CDT Wed Oct 21 2026

This Hazardous Weather Outlook is for northwest Iowa, west central
Iowa, southwest Minnesota, northeast Nebraska, central South
Dakota, east central South Dakota, south central South Dakota and
southeast South Dakota.

.DAY ONE...Tonight.

Fog may be possible by daybreak Thursday. Greater risks for locally
dense fog will exist along rivers and valley areas. Visibility under
1 mile will be possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Elevated fire danger is expected Thursday as warm, dry, and breezy
conditions prevail.

Widespread and potentially critical fire danger is possible Friday,
due to stronger winds. The highest fire danger will be located along
and west of the James River valley. Use caution to prevent sparks,
especially with harvest activities. Fires may spread quickly Friday.

Rain chances return this weekend, with very isolated non-severe
thunderstorms possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

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NWS Sioux Falls will discontinue the Hazardous Weather Outlook
product (HWO) on November 8, 2026. Weather hazards and outlooks
will continue to be provided through other standard NWS products,
including weather briefing packets, forecast discussions, weather
story graphics, the graphical hazardous weather outlook, and updated
hazard messaging. All local products and visual tools are accessible
directly at: weather.gov/siouxfalls.

$$