Two words characterize the Mississippi Flyway now--COLD and FRONT. And not just your everyday little chill in the air. The red-headed weatherman here in eastern Iowa--Kaj O'Mara, who's quite good, but looks young enough not to be out after the street lights come on--is calling for a 50-degree drop in temperature over the next 24-36 hours. So, so long, blue wing teal. Goodbye to many of the wood ducks still vying for what little water remains throughout the Hawkeye State. And hello to the first good push of Canadas, grey ducks, widgeon, sprig, and mallards, with--I hope!--a few green-wings thrown in there for good measure.