i like weather and i find dwarf fortresses weather to be rather boring (even the evil stuff but i have suggestions for that too
)
so what if freak weather events like tornadoes, hurricanes, blizzards, sand storms, thick fog cover, and volcanic ash clouds would occasionally occur in areas that they would happen normally (tornadoes is flat places , hurricanes near the sea etc.)
tornadoes seem like the best producer of fun as they could fling urist mcwoodcutter and his tree across the map
(the most fun can be had if a that siege thats leaving blew RIGHT over your well designed traps)
and fog would slow things down so they wont fall over urist mcfellfromatornado (same with sand storms and blizzards and ash clouds)
hurricanes and blizzards would blow things in the direction of the wind
but wait there's more
EVIL tornadoes, hurricanes, blizzards, sand storms, thick fog cover, and volcanic ash clouds that make dangerously large amounts of epic fun (zombie blizzard anyone?)
weather events would also have a effect on the worlds history eg. elf ogawoogawoogee was killed on the hill of vomit by the hurricane of cats or the siege of doors was broken by the tornado of lard and the human hamlet of laghrtenstrd was buried by the dust storm of sound