Hurricane Irma strengthens; Florida and Puerto Rico prepare September 3, 2017 by quixnet Hurricane Irma strengthens; Florida and Puerto Rico prepareCNN Hurricane Irma strengthens to Category 4 on its track toward the USWashington Post Puerto Rico Prepares For Category 4 Hurricane IrmaNPR As Hurricane Irma grows stronger, South Florida gears up for the stormMiami Herald Full coverage
