Light snow is falling on parts of northern Iowa this morning which is stunning when you consider we had highs in the 90s just a week ago. Brad Small, a meteorologist at the National Weather Service office in Johnston, says it’s not -that- out of the ordinary to have snow in May.The latest date on record for trace amounts of snow in Des Moines is May 28th, 1947. Small says today’s snow is not unprecedented, but it is rare. He says temperatures vary a lot during the spring. He says many cities could set record low highs today. As for the holiday weekend ahead, Small says the forecast is split with cool weather until Sunday and Monday.Many parts of Iowa are expecting highs today only in the 40s and 50s. Last week, Sioux City set a new record high with 101-degrees.