A blizzard was a type of weather phenomenon characterized by cold temperatures, high winds and heavy snowfall. Low visibility during a blizzard was referred to as a whiteout.
Hikaru Sulu had the misfortune to be caught in a blizzard in a malfunctioning recreation room with Leonard McCoy and Nyota Uhura in 2270 (TAS: "The Practical Joker")
In 2287, Sulu and Pavel Chekov pretended to be "caught in a blizzard" to avoid admitting that they were instead lost in a forest on Earth. Nyota Uhura wasn't fooled for a moment, but promised to keep their secret regardless. (Star Trek V: The Final Frontier)
Blizzards were among the manifestations of resident's imaginations that Odo found himself having to deal with in 2369 on Deep Space 9. (DS9: "If Wishes Were Horses")