The combination of very strong southerly winds, low relative humidity, and above normal temperatures has led to critical fire weather conditions across much of South Dakota and Minnesota. These critical fire weather conditions, combined with extremely dry fuels (grasses, cured crops, etc) has led to several large grass fires across South Dakota.
The public is urged to use caution due to the high fire danger.
The image below is a visible satellite picture from shortly after 2pm CDT (1901UTC) Wednesday. The red circles denote locations where grass fires have been observed in satellite data. The streaks of white within the red circles are smoke plumes being pushed from south to north by the prevailing southerly winds. The other white areas (generally west of the Missouri River/Lake Oahe) are normal clouds - not smoke plumes.