The National Weather Service has issued a Flood Watch for Arlington, Alexandria, Falls Church and surrounding areas of Northern Virginia, effective from 5 p.m. tonight (Tuesday).

Heavy rainfall from thunderstorms could produce 1 to 2 inches of rain in a short period, with some areas potentially seeing 3 to 5 inches where storms train over the same locations.

The weather service warns that excessive runoff may cause flooding of rivers, creeks, streams and other low-lying areas, particularly in urban locations prone to flash flooding.

The watch (below) is set to expire at midnight.

WHAT: Flash flooding caused by excessive rainfall continues to be possible.

WHERE: The District of Columbia, the following in Maryland, Montgomery, Frederick MD, and Prince Georges, and the following in Northern Virginia, Arlington/Falls Church/Alexandria.

WHEN: From 5 PM EDT this afternoon through this evening.

IMPACTS: Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations.

– Showers are likely with scattered thunderstorms this afternoon and evening. Some thunderstorms will contain heavy rainfall, with rain amounts of 1 to 2 inches in an hour or two. Storms may also train over the same areas causing the possibility of locally higher amounts around 3 to 5 inches. Heavy rain in a short period of time may cause rapid rises in creeks and streams as well as potential flash flooding in urban areas.

You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.