Maryland weather: Flash flood warning extended into Tuesday morning for most of Baltimore region

Much of the Baltimore metro area was placed under a flash-flood warning extending until 4 a.m. on Tuesday morning after storms swept through the area Monday night, the first of what forecasters predict will be a wet week in Maryland.

The National Weather Service issued flood warnings covering all of Baltimore City and Howard County as well as portions of Baltimore, Anne Arundel and Montgomery counties. Flooding had begun or was expected soon in parts of those areas, the agency said in an advisory issued shortly before 10 p.m.

As much as two inches of rain had already fallen on parts of Baltimore County by 10 p.m. Monday night and another two inches of rain was possible as showers continued into the early morning, according to the National Weather Service.

The sporadic flooding came after an approaching cold front on Monday night brought showers and thunderstorms, which could stick around beyond midnight, especially near the Chesapeake Bay. Damaging winds of 25-35 mph are possible, and NWS forecasters said they couldn’t rule out the chance of isolated tornadoes. Overnight, the low was forecast to be around 59 degrees.

As a result of lingering low pressure, Tuesday is likely to be brisk and cloudy in the Baltimore area, with a few showers during the day. There’s an 40% of rain, and the likelihood of precipitation is greater in the morning. High temperatures will be in the 60s, according to the weather service.

Wednesday and Thursday will be clear with high temperatures in the 60s, before another round of rain arrives Thursday night into Friday.

Starting after 2 a.m. Friday, there’s an 70% chance of showers, and they’re likely to continue through Friday. There’s a 40% chance of showers on Saturday, while high temperatures remain in the 60s.

So far, Halloween looks likely to be clear with a high near 65 degrees in Baltimore.