The National Weather Service in Sterling Virginia has issued a* Flood Warning for. Two inches of rain an hour could fall in the region, leading to possible flash floods, especially in urban and poor drainage areas, according to the organization. With the threat of severe weather, today remains a First Warning Weather Day.
Thunderstorms are expected to develop across the area from this afternoon into tonight ahead of a slow moving cold front, with the potential to lead to flash flooding, said the NWS.
Severe thunderstorm warning in effect for southern Carroll, western Howard, Montgomery and northern Prince George's counties until 4 p.m. Flash flooding may also be a problem if the same areas get hit multiple times with downpours.
The storm risk starts around 12 p.m. Monday.
A flood watch is in effect for the entire Baltimore metro region from 3 to 7 p.m. Monday, extending along the I-95 corridor to Washington and Philadelphia. Some storms could be severe, with damaging winds and heavy rain.
Meteorologists say the heaviest rain fell in southeast Livingston County with estimates of up to 5 inches of rain. At its height, the storm is forecast to dump 1 to 2 inches of rain per hour. Atmosphere conditions have to be "just right" for a thunderstorm to spawn a tornado, and Monday's severe weather parameters will be close.
Once the storms pass, the rest of the week with be partly sunny with temperatures in the 80s and a chance of showers. Some of those storms could be strong to severe with gusty winds and heavy rainfall, and small hail cannot be completely ruled out.