Atlantans might want to keep their umbrellas at hand as a string of showers and thunderstorms are set to intermittently pelt the city, bringing a damp start to their week. The National Weather Service is predicting a 40 percent chance of rain possibly accompanying thunderstorms from today afternoon. For folks stepping outdoors, the day will warm up to a comfortable high near 78 degrees with a light southwest breeze manifesting post-noon, according to the National Weather Service forecast.