Heavy rain is expected tomorrow night, and already the National Weather Service is warning of possible flooding.

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A FLASH FLOOD WATCH FOR THE WASHINGTON AND BALTIMORE METROPOLITAN AREAS FROM LATE TUESDAY NIGHT THROUGH WEDNESDAY AFTERNOON

A STRONG COLD FRONT WILL SLOWLY APPROACH THE AREA TUESDAY NIGHT BEFORE PASSING THROUGH EARLY WEDNESDAY MORNING. RAIN IS EXPECTED TO OVERSPREAD THE AREA BY TUESDAY EVENING…BUT THE HEAVIEST RAINFALL IS EXPECTED LATE TUESDAY NIGHT THROUGH WEDNESDAY MORNING. RAINFALL AMOUNTS AROUND ONE TO TWO INCHES ARE EXPECTED WITH ISOLATED AMOUNTS UP TO 3 INCHES POSSIBLE IN HEAVIER BANDS OF RAIN AND THUNDERSTORMS. HEAVY AMOUNTS OF RAINFALL MAY CAUSE SMALL STREAMS AND CREEKS TO RISE OUT OF THEIR BANKS.

A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.