It was a situation much like what you are not in that is why when we used to travel this time of year, I had a plan.....
The biggest part of that plan was to leave early than Might Normally be needed. We would have fuel, water and provisions for three days at departure.
It paid off big time a few years back. We had just crossed into a mountainous area and were expecting to clear it before dark.
Surprise!! It was early by about four hours. We managed to find a place to hunker down and spent a the next day and an half watching out the warm windows as the chaos ruled all around us. We had everything we needed right there. The cellphone provided internet. It was slow, but it was otherwise a fine couple of days.
Matt