Years ago while living in LongCreek, SC I noticed my chickens going to roost at 12 noon. The day was cloudy and cold and all the usual wildlife was absent. Those tiny little sparrows that usually darted about were gone. The roosters were not crowing. Every chicken I owned had put themselves to bed. Many of them had tucked their heads under their wings and ignored me. The silence made the hair on the back of my neck stand up.
My instincts came to play and I began to collect water in every jug, bucket or whatever didn't leak. I went to town to purchase supplies, feed, and food for humans. I collected firewood even though we didn't have a fireplace
Two days later there was 24 inches of snow on the ground and a 6 inch sheet of ice on any paved road. No power for 5 days. I remember chipping the ice off the water for the avians that lived inside with me. I made a bonfire outside to heat water for the birds and horse. My Subaru Brat car proved to do very well on ice and snowy roads but I couldn't get to work for over a week because of all the wreck vehicles on the road. This type of snowstorm was catastrophic in the South. Nobody was prepared for that kind of weather.
I didn't lose one chicken during that storm. They knew what to do.