* WHAT...Sub-freezing temperatures are expected.
* WHERE...Portions of northwestern, south central and
southwestern South Dakota and northeast Wyoming. This includes
the Tribal Lands of the Cheyenne River Reservation, the Pine
Ridge Reservation and the Rosebud Reservation.
* WHEN...From 11 PM MDT /midnight CDT/ this evening to 8 AM MDT
/9 AM CDT/ Saturday.
* IMPACTS...Frost and freeze conditions will kill crops, other
sensitive vegetation.
Smoke from western Canada wildfires will continue to move
southeast into the area behind a passing cold front. Visibilities
will be reduced through the nighttime hours, as low as around one
mile in some areas, especially across northwest South Dakota. If
driving, slow down, use your low-beam headlights, and leave plenty
of distance ahead of you if you encounter thicker areas of smoke.
Individuals with respiratory problems should avoid excessive
physical exertion and minimize outdoor activities.