 Drinking plenty of water no matter what. If you plan to be outside or not, it's always just a good bet to be hydrated. And also wearing loose-fitting, light-colored clothing. Along with the excessive heat tomorrow, there's also a chance of some strong to severe storms. Now, while the heat will be just about for everybody, the chance for showers and storms is mostly isolated in nature. Not everyone will see those showers and storms, but those who do could pick up some briefly heavy downpours, some potentially damaging winds.