FPL has a site that tracks power outages by zipcode.
As of Sunday, 9:20 am, with Irma over the Keys:
Sarasota County has 10 shelters open - see this page for updates.
Manatee Couunty opened 23 shelters - check this page for which are still open.
National Hurricane Center home page
Latest Advisory - also here - Levi Cowan's page.
WUSF has continuous coverage out of Tampa/St. Pete.
Ventusky - visualization of various weather components.