The Frog Fire has burned 1,380 acres; containment is unknown as of Tuesday morning.
The fire is near Little Boulder Creek, off the east fork of the Salmon River, according to the Custer County Sheriff’s Office. The fire is exhibiting extreme behavior, with managers observing wind-driven runs and short-range spotting.
Officials expect the fire to spread toward structures east and north of it over the next 12 to 72 hours, according to the office. Winds may also push the fire beyond Little and Big Boulder Creek drainages.