Warm days are expected in the Western U.S. before moisture arrives later this week. Meteorologists are closely monitoring Tropical Storm Mario and the potential formation of a new tropical system, which could bring showers and thunderstorms to the Southwest. Early in the week, the Four Corners region will experience drier conditions, while California’s Central Valley is set to heat up, with temperatures nearing 100°F (37.8°C). This early warmth will provide a brief respite before the anticipated change in weather patterns.