NASA Satellite Finds Winds Tearing Tropical Depression Isaac Apart

Joyce forms in the Atlantic

Joyce forms in the Atlantic

Hurricane Helene continued weakening in the eastern Atlantic Ocean and is expected to become a tropical storm by Thursday night, forecasters said.

Hurricane Helene is now churning northeast through the Atlantic Ocean around 655 miles (1,055 km) south-west of the Portuguese Azores with maximum sustained winds of 70mph. Because hurricane preparedness activities become hard once winds reach tropical storm force, the hurricane watch is issued 48 hours in advance of the anticipated onset of tropical storm force winds.

Isaac is moving west at 21 miles per hour.

A "yellow" danger to life weather warning has been issued with Storm Helene set to hit the United Kingdom and Ireland next week. The hurricane will weaken as it moves over cooler water, and is expected to be downgraded from hurricane to tropical storm status before making the transition to post-tropical storm on Sunday.

Tropical Storm Isaac is expected to produce total rainfall accumulations of 2 to 4 inches with isolated amounts up to 6 inches across Martinique, Dominica, and Guadeloupe, especially over elevated terrain.

Trouble began brewing last week, when three hurricanes-Florence, Isaac, and Helene-starting churning up the North Atlantic.

At least 800 flights have been cancelled or grounded due to the storm's expected landfall, CNN reported.

Subtropical Storm Joyce has maximum sustained winds of near 45 miles per hour (75 km/h) with higher gusts.

According to NHC: "A Hurricane Watch means that hurricane conditions are possible within the watch area".

At 5 a.m., the storm was centered 575 miles (925 km) southeast of Cape Fear, North Carolina, moving at 17 mph (28 kph). Coastal areas in both Carolinas have taken steps to evacuate residents and tourists, including a mandatory evacuation in SC.

The agency is also monitoring a tropical disturbance that has a 60 percent chance of forming a tropical storm.

The NHC forecast track shows the storm decreasing in forward speed as it heads west towards Central America. Regardless of whether a system forms, they say heavy rain and gusty winds are likely along the Texas and Louisiana coast later this week.