Weather: getting lots of rain possible 12 or more inches of rain
That's a dangerous amount of rain, which will lead to flooding. I'd be inclined to confine them to the coop and/or another safe location (garage, shed, etc.) during the brunt of the storm. If the run is covered, that may help protect them as well.
May God keep you, your family and your livestock safe during the storm.
Edited by song of joy - 10/23/15 at 5:38pm