Residents of Butte, Harding, Northern Perkins, and Southern Perkins in South Dakota should exercise caution this morning due to a Dense Fog Advisory issued by the NWS Rapid City SD effective until 9:00 AM MDT. Visibility may drop to a quarter mile or less, creating hazardous driving conditions. If you must travel, use your headlights, slow down, and maintain a safe distance from other vehicles. This advisory notably affects those commuting or traveling around these areas, so please plan extra time for your journey and consider delaying travel until the fog lifts after 9 AM.

South Dakota has a humid continental climate with four distinct seasons. The Missouri River, which forms the eastern border of the state, is the largest and most significant surface flow. It is subject to extreme flooding during spring and summer due to snowmelt and heavy rainfall. Other major rivers include the Cheyenne, James, and Big Sioux. The state has several reservoirs and dams, including the Oahe, Fort Randall, and Big Bend dams, which provide flood control, irrigation, and hydroelectric power. South Dakota's hydrology is influenced by its topography, soil type, and vegetation cover, which affect the amount and rate of water infiltration and runoff. The state's snowpack and precipitation patterns are important factors in determining water availability and storage.