In New York this afternoon, tennis players at the U.S. Open were pulled off the court as Earl's rain bands began to darken the skies.
Rain and high winds also swept New York's Long Island and parts of New England.
Earl is causing major travel delays during this holiday weekend. Amtrak has canceled trains to Newport News, Va., from other parts of Virginia.
At least 50 Continental flights have been canceled from Newark, N.J., and Delta began canceling flights Thursday.
Most of the major airlines are waiving fees so passengers at potentially affected airports can rebook their flights for a later date. So far, refunds are available only if a flight has been canceled.
Links to specific airlines for more information can be found below.
ABC News' Michael S. James, Gerard McNiff, Steve Osunsami, Bradley Blackburn and Lee Ferran contributed to this report.
Residents can monitor the hurricane's location on the National Hurricane Center's website.
US Airways Southwest JetBlue AirTran Virgin America Spirit