While the majority of the day Sunday will remain dry with some sunshine, a warm front will lift through during the evening period, and that will cause clouds increasing and allow rain to fall. The rain will be heavy at times, and we may even see a thunderstorm or two develop during the overnight period. By the time we roll around to the lunch hour on Monday, most will see around 1/2"-1" of new rain, with some localized areas getting more. Keep the rain gear handy for the next 36 hours.