I really like the Sandstorm mechanic, and i think the game would benefit from a unique extreme weather event mechanic for each biome. These would be random and temporary and would do damage to the player, their pets and thralls, and property, but could be mitigated with planning, thoughtful building and certain tactics
My suggestions are;
Arctic/Glacier - Blizzard
Savannah/Plains - Tornado
Highlands/Tundra- Lightning storm
Jungle- Monsoon Rains
Coastal region - Hurricane
River - Flood
Wind and floodwaters destroy buildings, water increases the decay timer on structures and tots food, the blizzard freezes the blood in your veijns and kills man and beast alike.
Earthquakes, grass/forest fires could be added as well. A swarm of locusts that devastates the crops and plants in an area would be similarly interesting.
Ensure your home has a strongly built basement to ride out the tornado! Build on stilts to avoid the rising floodwaters, or place crude lightning rods strategically to draw Croms wrath away from your squalid hut!
Sounds fun to me!