Nation Hurricane Isaias forecast to become 90 mph storm; hurricane watch issued for Florida’s east coast July 31, 2020July 31, 2020Cheryl McCloud, Treasure Coast NewspapersComments Off on Hurricane Isaias forecast to become 90 mph storm; hurricane watch issued for Florida’s east coast Hurricane Isaias may strengthen to a Category 2. Tropical storm conditions are likely in Miami on Friday night or early Saturday morning.