BILLINGS, Mont. (AP) — Local officials say swollen rivers and impassable roads have cut off hundreds of people from outside access in central Montana with more rain and snow expected to further aggravate flooding.

Musselshell County emergency services director Jeff Gates said at least 500 people were stranded at least temporarily in rural communities southeast and southwest of Roundup.

Gates says plans are being crafted to ensure sufficient food and medical supplies are available to stranded residents.

Along the Musselshell River in Roundup, about two dozen houses remain evacuated with more evacuations possible if the water starts to rise.

The National Weather Service says a storm system moving into the region will bring rain and wet snow through early Tuesday. More than an inch of precipitation was forecast in some areas.