It is going to be a brutally hot and humid day. A Heat Advisory is in effect for today across much of central and southern South Dakota. In Sioux Falls, high temps will reach the mid 90s with the heat index approaching 105 degrees through much of the afternoon. Across Central South Dakota, it will not be as humid but actual temperatures will soar to between 105 and 110 degrees.
Our other concern with today’s weather is the potential for strong to severe thunderstorms late today and tonight. Thunderstorms will develop across central and northern South Dakota late this afternoon and move southeastward through the evening and overnight. Storms could be severe with the main threats being large hail and damaging straight-line wind, however, a tornado is also possible. In addition to severe weather, there could also be areas of heavy rain. One-quarter to one-half inch or more of rain will be possible with any storms that develop.
As of right now, I think storms will develop across central and northern South Dakota late this afternoon into early evening and move southeast into Sioux Falls by mid to late evening. The timing could change a bit, stay with us for updates throughout the day.
Mostly sunny, hot and humid. High: 94° with the heat index approaching 105°. Wind: Southeast 10-20 mph.
Thunderstorms likely. Some could be severe with heavy rain. Low: 70°. Wind: Southeast 5-10 mph.
Partly cloudy, warm and humid with scattered storms. High: 90°. Wind: East 5-15 mph.