AlertDC is warning D.C. metro area residents that Tropical Storm Hanna, which could become a full-fledged hurricane before it hits the U.S. shore, may dump some severe weather on the Mid-Atlantic region as early as late Friday night/Saturday morning. Right now the National Weather Service is more simply predicting a 70 percent chance of rain and thunderstorms starting Friday night and through Saturday.

Over at the Capital Weather Gang, the local weather bloggers only have a “low-medium” confidence level on the Hanna forecast at this point, writing that the “metro area could be in the bull’s-eye of rainfall, or it could just as easily be toward the eastern or western fringe of the storm.”

Despite the uncertainty, the D.C. government is urging residents to take this opportunity to review their family’s emergency plan and prepare an emergency kit.

In the meantime, flood-plagued Haiti continues to suffer more deaths and destruction thanks to Hanna.