Maximum sustained winds remain near 60 miles per hour (95 km/h) with higher gusts. It was moving to the west at 16 miles per hour with maximum sustained winds of 35 miles per hour.
The National Hurricane Center is predicting the storm will produce "catastrophic flash flooding and significant river flooding". Many areas in the low-lying city flood with routine rain storms, causing street closures and detours. When Isaac reaches the west-central Caribbean Sea in a couple of days, the shear may relax somewhat and the global models suggest that there will be an increase in mid-level moisture.
Duke Energy says damage from Hurricane Florence could cut off electricity to three-quarters of its 4 million customers in the Carolinas, and the outages could last for weeks.
The mayor of a SC city in the path of powerful Hurricane Florence is warning citizens to get out or stay "at your own peril". A tropical storm watch was issued for Antigua, Montserrat, St. Kitts and Nevis, and Saba and St. Eustatius.
"At this time, Tropical Storm Isaac is not considered an imminent threat to the Cayman Islands but that could change", said Tara Rivers, Minister responsible for HMCI.
The primary concern in the short term is Hurricane Florence.
A spokeswoman said: "Basically Helene is in the Atlantic at the moment and is crossing the Atlantic and is expected to track towards the UK".More news: U.S. seeking new trade talks with China
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Florence is now 485 miles from Wilmington, North Carolina.
For anyone hoping that Hurricane Florence will be the only major hurricane of the season, residents of the east coast won't be so lucky.
At 11 a.m., the center of the system was about 190 miles east-southeast of Kingston, Jamaica.
Mapp, who spoke with the National Weather Service and Virgin Islands Emergency Management Agency officials again this morning, said two to four inches of rain are expected on St. Croix beginning Thursday evening.
"The deepest water will occur along the immediate coast in areas of onshore winds, where the surge will be accompanied by large and destructive waves", the NHC said.
Hurricane Florence isn't the only storm threatening lives and property around the world.