Puerto Rico is bracing for Storm Fiona’s impact. Already winds are increasing and waves swelling. Residents are bracing for flash floods and mudslides. The tropical storm could become a hurricane tomorrow. Many are racing to fill gas tanks as officials in some towns warn residents to evacuate. Fear was well-founded after Hurricanes Maria and Irma ravaged the island’s fragile power grid. The governor also got an early taste when the lights went out during his press conference. He is now urging citizens not to underestimate the storm. » Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows. Connect with NBC News Online! NBC News App: https://smart.link/5d0cd9df61b80 Breaking News Alerts: https://link.nbcnews.com/join/5cj/breaking-news-signup?cid=sm_npd_nn_yt_bn-clip_190621 Visit NBCNews.Com: http://nbcnews.to/ReadNBC Find NBC News on Facebook: http://nbcnews.to/LikeNBC Follow NBC News on Twitter: http://nbcnews.to/FollowNBC #NBCNews #PuertoRico #TropicalStorm