It last happened in The sahara Desert
What are sandstorm
If a horse is caught in a sandstorm, it may experience physical discomfort due to sand getting into its eyes, ears, and nostrils. The horse may become disoriented from reduced visibility and may struggle to breathe due to the dusty conditions. It's important to seek shelter during a sandstorm to protect the horse from these potential hazards.
You don't
Sandstorms typically last for a few hours to a day, but can sometimes persist for several days depending on the conditions causing the storm.
Yes, Sandstorm's mother, Brindleface, did die. She was killed by a pack of wild dogs while trying to protect her Clanmates.