The Great Basin and Southwest regions of the United States are bracing for widespread rain as a weakening atmospheric river shifts inland. Today and Sunday will see a steady spread of rain into Nevada, Utah, Arizona, and adjacent states. While the intensity is expected to be less severe compared to the coastal regions of California, the surge of moisture still poses a risk of localized flooding, particularly in slot canyons and normally dry riverbeds. Residents and visitors should exercise caution and avoid these areas during periods of heavy rainfall.