A fog advisory was issued Tuesday morning for Red Deer and parts of central Alberta.
Environment Canada said near zero visibility is expected or occurring, and fog was expected to persist through the morning.
Visibility may be significantly and suddenly reduced to near zero. Travel is expected to be hazardous due to reduced visibility in some locations.
Red Deer Catholic Regional Schools cancelled school bus service — for the morning only — for Blackfalds, Innisfail, Sylvan Lake, and Red Deer County. Schools remain open.
The advisory has been issued for Red Deer; Red Deer County near Elnora, Lousana, Delburne, Penhold, Innisfail, Bowden, Pine Lake, and Spruce View; Lacombe County near Lacombe, Blackfalds, Bentley, Eckville, Clive, Alix and Mirror; Ponoka County near Ponoka and Maskwacis; Stettler County near Donalda and Stettler.