While Hurricane Florence continues barreling toward the Carolina coast, the Caribbean got some good news Wednesday: Isaac appears to be weakening. Wind shear, which refers to fluctuations in wind strength in the atmosphere, something that tears storms apart, is present in Isaac's path.
That storm, which has maximum winds of up to 255 km/h (equivalent to a Category 5 hurricane), was believed to be putting over four million people at risk. It will continue to move to the west and away from the V.I. during the overnight hours.
Tropical Storm Isaac, which passed between the Caribbean island nations of Dominica and Martinique late Wednesday and early Thursday, is now moving nearly due west across the eastern Caribbean Sea. "It's just not anywhere near a level of Maria", forecaster Eric Blake said.
She said: "Helene is moving up from the Atlantic towards us". At that time, Isaac will be a strong tropical storm with top winds of 60 miles per hour.
"It's just extremely busy and it's even busier than a year ago and all at once", Blake said. "It's a nasty interplay that makes it very hard".
Although Helene is now a hurricane, it will weaken and be downgraded to a tropical storm by the time it reaches the Azores. In general, wind shear is a measure of how the speed and direction of winds change with altitude. Isaac is expected to dissipate within the next few days.
The National Hurricane Center and computer models have shifted the forecast track for Hurricane Florence noticeably to the south and west, but it doesn't mean northern North Carolina, Virginia and other mid-Atlantic states are in the clear.
"Maximum sustained winds remain near 150km/h with higher gusts".
Florence is the most worrisome of the bunch as it lumbers toward the East Coast carrying the threat of a deadly 13-foot ocean surge and flooding rains.
"Some roads and bridges may close". Tropical storms generate winds between 39 and 73 miles per hour, just below hurricane force.
Tropical storm-force winds - 39 to 73 mph (63 to 118 km/h) - further extend Florence's reach; these winds surround the eye to a distance of 150 miles (240 km) from the center, according to the report. Storm winds could intensify through the day and tonight, but weaken slightly Thursday as it nears the coast.
And, if you're already out of Florence's way but want to help, here's how.
Tropical Storm Isaac became less organized Thursday as it moved across the eastern Caribbean on its way toward Central America, the National Hurricane Center said.
A system in the central Gulf of Mexico was a little less certain.
NASA also shared this video-a "stark and sobering" view of Hurricane Florence-shot using a high-definition camera outside the ISS captured.