the snow changed to rain by noon

Do not use yahoo answers, wikianswers, answers.com or any other question answering online sites. I need an original answer.-Question:On a given day in the winter in St. Louis, Missouri it began snowing in the morning, the snow changed to rain by noon, later in the afternoon sleet was falling which turned to snow, and by evening rain was freezing on bridges and roadways. Briefly explain how such a sequence of precipitation might occur.

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