A freeze in which seasonal vegetation is destroyed, the ground surface is frozen solid underfoot, and heavy ice is formed on small water surfaces such as puddles and water containers. It is to be dist
inguished from a hard frost (black frost).
Opaque, granular masses of rime deposited chiefly on vertical surfaces by a dense supercooled fog. Hard rime is more compact and amorphous than soft rime and may build out into the wind as glazed cone
s or ice feathers. The icing of ships and shoreline structures by supercooled spray from the sea usually has the characteristics of hard rime.