 Widespread high temperatures reaching 105 to 115 degrees are in store yet again from California's Central Valley and southern deserts into the usual hot spots of southern Arizona with another blistering day for Las Vegas as triple-digit heat builds into Salt Lake City. Today, the extreme temperatures even expand into zones such as the northern high plains that have mostly missed out on the worst of the heat so far as western Nebraska and the Dakotas can have highs nearing the century mark.