An early season winter storm left too little snow to open northeast Minnesota snowmobile or ski trails; but it did lift spirits of business people hard hit last year's mild winter. Minnesota Public Radio's Bob Kelleher reports: The difference between "El Nino" and "La Nina" could mean millions of dollars for Northern Minnesota. Last year "El Nino" brought dry pleasant and relatively snow-free conditions to Northern Minnesota. Climatoligists are predicting "La Nina" will produce the opposite, bringing much colder weather than normal and an extra punch of snow. That's the best of news for the region's ski hills, winter resorts and many small business people across the state. Duluth Lawn and Sport relies on snowmobiles and sn