586 

FLUS43 KFSD 290935

HWOFSD



Hazardous Weather Outlook

National Weather Service Sioux Falls SD

435 AM CDT Mon Jun 29 2026



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435 AM CDT Mon Jun 29 2026



This Hazardous Weather Outlook is for northwest Iowa, west central 

Iowa, southwest Minnesota, northeast Nebraska, east central South 

Dakota and southeast South Dakota.



.DAY ONE...Today and tonight.



Heat indices will climb into the triple digits this afternoon to

early evening, with readings as high as 105 to 108 degrees from

around Sioux City toward Spencer and Storm Lake in northwest Iowa.

Take precautions to limit your risk of heat illness if spending time

outdoors.



Scattered strong to severe thunderstorms may develop evening. If

storms are able to develop, the main threats with the strongest 

storms will be hail up to golf ball size and damaging wind gusts up 

to 75 mph, but a tornado or two and locally heavy rainfall are also 

possible. There is an additional low risk for an isolated strong to

severe storm late tonight into early Tuesday morning.



.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.



Isolated severe storms are possible again Tuesday night, and perhaps

again on Wednesday, but confidence in any details is low at this 

time.



.SPOTTER INFORMATION STATEMENT...



Spotter activation may be needed after 5 pm this afternoon.



$$



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435 AM CDT Mon Jun 29 2026



This Hazardous Weather Outlook is for central South Dakota, east 

central South Dakota, south central South Dakota and southeast 

South Dakota.



.DAY ONE...Today and tonight.



Areas of dense fog will reduce visibility to a quarter mile or less

early this morning. Conditions are expected to improve after sunrise.



There is a low probability that severe storms in central South Dakota

could move into areas from Chamberlain to Huron after daybreak.

These storms would bring a risk of damaging winds in excess of 70

mph and large hail up to 2 inch diameter if they maintain their

current strength.



Heat index values will climb into the 90s this afternoon, mainly east

of Highway 281. at times Monday afternoon into the evening. Take 

precautions to limit your risk of heat illness if spending time 

outdoors.



.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.



Isolated severe storms are possible again Tuesday night, and perhaps

again on Wednesday, but confidence in any details is low at this 

time.



.SPOTTER INFORMATION STATEMENT...



Spotter activation may be needed before 9 AM this morning, mainly for

areas from around Chamberlain to Huron.



$$