 This is why the National Weather Service will issue an excessive heat warning beginning at 11 a.m., lasting until about 8 p.m. tonight. Remember those heat safety tips as well. That includes drinking plenty of water, taking plenty of breaks in the shade, and wearing loose-fitting, light-colored clothing. We're also tracking the chance that a few showers and storms may be isolated in nature. Those who do see the rain could expect some briefly heavy downpours, some frequent lightning, and the potential for some damaging winds. I'm 7 News meteorologist Mark Pena in the First Alert Weather Center.