At this time of year, apparently, TV meteorologists get the itch to make predictions months in advance. We thought such hubris only oozed from Channel Sux's Jim Flowers, but Sunday night showed that KETVNewswatch7's chief weather-guesser, Bill Randby had caught the same bug.Randby's "Winter Forecast," in fact, looked like it had been ripped straight from Jim's script of a week or two ago. La Nina