The precipitation began as snow in most places, but as warmer air was pulled into the storm later in the period, many places saw the snow change to freezing rain.
(The precipitation; began; as snow; L:in most places) (warmer air; was pulled; into the storm; T:later in the period) (many places; saw; the snow change to freezing rain)
The precipitation warmer air many places
began was pulled saw
as snow L:in most places
into the storm T:later in the period
the snow change to freezing rain