Ernesto threatens Puerto Rico with flooding, is poised to become hurricane The Washington PostErnesto Expected To Become A Hurricane The Weather ChannelGreat stretch of weather continues Wednesday in Philadelphia region; tracking Tropical Storm Ernesto’s path CBS NewsTropical Storm Ernesto tracker: Latest forecast as tropical storm heads toward Virgin Islands, Puerto Rico this evening Yahoo! VoicesA strengthening Ernesto is poised to become a hurricane after brushing past Puerto Rico The Associated Press