Conjectures say 3 crawls of rain is conceivable Friday into Saturday crosswise over a great part of the zone. Electrical storms could cause locally higher precipitation sums that may bring about quick ascents in streams and springs. This could rapidly bring about flooding in low lying and poor waste regions. The watch zone incorporates the District of Columbia, in addition to Arlington, Falls Church, Alexandria, Eastern Loudoun, Fairfax, Frederick, Fauquier, Prince William, Manassas, Manassas Park, Stafford, Warren, and the Loudoun zones.