This rainfall may cause unsafe flash flooding. Florence has 130 miles per hour winds, enough to make it a risky Category 4 hurricane.
Tropical Storm Isaac made its closest approach to St. Croix Thursday night, passing nearly 200 miles to the south and having no apparent impact on the territory as it made its leisurely way across the Caribbean.
In contrast, no coastal watches or warnings were in effect for Helene, but residents of the Azores were encouraged to monitor the storm.
RTE reports that the National Hurricane Centre in the USA said that the weather event will be packing wind speeds of 140km/h, but that by the time it reaches the United Kingdom and Ireland, it won't be as severe as it has been elsewhere.
There are now four storms swirling in the Atlantic Ocean with the formation of Tropical Storm Joyce.
"Some roads and bridges may close".
That's almost double the wave heights documented on Tuesday, when the NHC said satellites had observed "an expansive area of wave heights 12 feet or greater" circulating around Hurricane Florence and peak waves of 45 feet near its center.
(CBSMiami) - Tropical storm force winds from Isaac will pass through the Lesser Antilles, near Dominica and Martinique Thursday. "Prepare for long power outages".
Little change in strength is expected over the next several hours as Isaac moves through the Leeward Islands.
"A broad area of low pressure is located over the central Gulf of Mexico". While early on Wednesday the odds of it forming dropped, by afternoon forecasters had again increased the chance to 70 percent over two days. Regardless of whether a system forms, they say heavy rain and gusty winds are likely along the Texas and Louisiana coast later this week. A hurricane hunter plane is scheduled to investigate the system Thursday.
"There remains large uncertainty in Helene's exact track, however a spell of very strong winds is expected, initially for parts of south-west England and west Wales, then later south-west Scotland and the south-east of Northern Ireland".