The weather service warns that while areas along creeks and streams are most vulnerable to flash flooding, it can occur in nearly any area. One or two storms could show up early this afternoon, but the bulk of the rain looks to show up after 3 to 4pm.
The weather service issued a flash flood watch for the D.C. area until 5 a.m. Most of the rain is expected during the afternoon hours.
As for severe thunderstorms, there will likely be a couple around through this evening, but widespread damaging wind and hail is unlikely. As we heat up a bit, showers and thunderstorms should becoming more abundant into the afternoon. Rain will come off and on in waves through the day so we will have some periods of dry weather and a chance of some sunshine peaking through and periods of heavy downpours. That's because the more days it rains, there's less of a chance of the increasingly saturated ground being able to soak up that rain.
"We are stuck in this prolonged pattern as moisture will continue to feed right into the region from the south", Storm Team 4 meteorologist Lauryn Ricketts said.
Tuesday and Wednesday will be cool for late July, with highs in the low to mid 80s.
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Monday: Cloudy with some showers and scattered storms.
Prince William fire and rescue officials reported nine people were rescued from flood waters on Saturday.
Thereafter, rain and thunderstorm chances will diminish the rest of the week, but may not entirely go away.
Flooding conditions have suspended MTA service from Patapsco to Cromwell and BWI Thurgood Marshall Airport stations.
Across Palm Beach County on Sunday, more than 12,000 Florida Power and Light customers temporarily lost electricity because of severe storms.