 Farther south, there could be some scattered afternoon thunderstorms through parts of Arizona and New Mexico, mainly in the higher elevations. Meanwhile, in the west, it will remain largely dry and will become hot again in the afternoon. This will be a part of a major heat wave that will develop through the region through the holiday week into the weekend. Highs in the valley areas will easily reach into the 100s, with many places surpassing 110. It will be more comfortable in the northwest with highs in the 70s and 80s.