Collocations for fog - noun

dense, heavy, thick
freezing (BrE)
patchy
Drizzle and patchy fog are forecast.

swirling
morning

bank, blanket, layer, patch
The town was shrouded in a thick blanket of fog.

be covered with, be shrouded in

cover sth, envelop sth, lie, shroud sth, surround sth
A freezing fog lay over the valley.

close in, come down (esp. BrE), descend, roll in
A dense fog came down in the afternoon.
A heavy fog rolled in from the coast.

thicken
clear, disperse, lift
The fog had lifted by late morning.

drift, swirl
fog drifting over the water

obscure sth
A bank of fog obscured the farmhouse.

patches (esp. BrE)
bank (esp. AmE)
lamp (BrE), light (= on cars)
horn (usually foghorn)

in (a/the) fog, into (a/the) fog
We got lost in the fog.

through (a/the) fog
We drove slowly through the fog.