Lousy skiing and bad apples.That's what Pacific Northwest residents may be able to expect in 80 or so years.While global warming usually is seen as fairly simple event-few er cold days in the winter,a few more 100-plus-degree days inJuly-its regional implicationns could be far more dramatic.That's what climate researcher Ruby Leung of the PacificNorthwest Nation Laboratory in Richland,Washington,found when she ran computer models to study the impact of a warmer climate on Oregon and Washington.Her conclusion: