NOAA / NESDIS / STAR GOES-East
Tropical Storm Isaiah brings torrential rains, strong winds and frequent lightning strikes to Puerto Rico on Thursday morning. Isaias is expected to cross the Dominican Republic before reaching Florida this weekend.
The storm “threatens the life of the outbreak and strong wind over Puerto Rico,” – said the office of the National Weather Service in San Juan. The impact of the storm varies from felled trees and power lines to mud, the agency said.
8:00 a.m. July 30: Interim counseling Interim warning №8A: Isaiah threatened the life of the outbreak and strong wind over Puerto Rico. | Isaiah caused life-threatening outbreaks and strong winds over Puerto Rico. #prwx #usviwx pic.twitter.com/Tf5Q9pTggy
– NWS San Juan (@NWSSanJuan) July 30, 2020
Isaias will receive 4 to 8 inches of rain in Puerto Rico, the Dominican Republic and northern Haiti, according to the NWS, and some areas will receive up to 10 inches.
In Miami, the first winds, which strongly delay the tropical storm, may arrive late on Friday, according to the meteorological service.
“Heavy rains associated with Isaias could start hitting South Florida on Saturday morning,” they said Thursday morning. “This rain can lead to isolated outbreaks and urban floods, especially in low-lying and poorly drained areas.”
Isaiah is now projecting tropical storm winds outside for up to 310 miles, a sign of rapid growth since Wednesday, when he became the ninth named storm of the Atlantic season. NWS classifies tropical storm winds from 39-73 mph at the surface level.
National Weather Service
The maximum withstood the storm is at a speed of 60 mph, with stronger gusts. In order to be considered a hurricane, the wind supported by Isaasi had to reach at least 74 mph. Forecasters say the system will weaken as it passes over the Dominican Republic later today, but Isaiah is likely to strengthen on Friday and Saturday.
Isaiah has warned of tropical storms on a number of Caribbean islands, from Puerto Rico and the US Virgin Islands to the Turks and Caicos Islands and parts of the Bahamas.
The system was being prepared mainly from west to northwest, but in early Thursday it took a sharper direction to the northwest. A skirt is now forecast for Florida’s Atlantic coast, which runs near West Palm Beach and Port St. Lucy.
The current track does not call on Isaiah to build a potential waterfall on the U.S. mainland until it overlooks the north coast of North Carolina, meaning heavy storm rains could dangerously flood flooding of low-lying areas along the U.S. coast in the southeast.
Concerns over the effects of the storm in Florida prompted officials to suspend coronavirus testing in government facilities for several days, from Friday to Tuesday.