Also, on calm nights in rolling terrain, the cold, dense air drains toward the low spots keeping nearby ridge tops warmer.
12.
The floors of inland valleys away from warming influence of the sea can be particularly cold as cold, dense air drains into them.
13.
Since the low-lying marshes collect rainwater from Pacific storms, and cold, dense air drains from surrounding mountains during the long nights of winter, they are breeding grounds for fog.
14.
Whittier is situated approximately inland of the Pacific Ocean, resulting in higher daytime temperatures, and since it lies at a higher elevations than the cities further west, cold air drains into lower elevation of the Los Angeles Basin which results in warmer night-time lows, producing an example of thermal inversion.
