What’s this? “A nice warm-up“? Mild temperature forecasts in the mid-50s? Plenty of rain? It sounds like we might have skipped forward a couple of months. (Those poor, confused plants out there; little do they know that sub-freezing weather will return next week.) But while the climate during the day today might be acceptable for those looking to cast aside their poofy jackets, this evening — and likely tomorrow — will bring nothing but a whole lot of yucky. The National Weather Service has issued a preemptive Flash Flood Watch for this evening through Monday morning. As precipitation levels could reach 2 inches or more in the District, the city is making sandbags available for those at risk of flooding. Pack your sturdiest bumbershoot, D.C.