For our gentle southern friends; that's when the snow is melting but frost is still in the ground. Result is a constantly changing layer of soil that is the consistency of chocolate pudding, it's resting on glare ice below,, treacherous and messy to the max. It looks like lawn or path but is about as easy to cross as quicksand. You cannot comprehend how heinous this stuff is unless you've experienced it! To make us feel better, the roads are in full frost heave mode with areas of loose sand, salt everywhere......... Ice where melting snow has run across shaded pavement also lurks.