What are snow squalls and why are they dangerous?

DETROIT (FOX 2) - Snow squalls are short-lived, but that they are dangerous.

Bursts of snow cause whiteout conditions. There are typically gusty winds as well, leading to limited visibility. This is a snow squall.

A large amount of snow often doesn't fall during a squall. However, that period of little visibility can spell disaster for drivers.

Snow squalls in Metro Detroit on Feb. 13 caused pileups that involved up to 160 vehicles on the freeway.