Published: Sat, September 15, 2018
Science | By

Hurricane Helene turns northward, no landfall expected

Hurricane Helene turns northward, no landfall expected

At 8 a.m. the centre of Tropical Storm Isaac was located near latitude 14.4 North, longitude 54.1 West. Isaac is moving toward the west near 15 miles per hour (24 km/h), and this general motion is expected to continue through the weekend.

A Tropical Storm Warning means that tropical storm conditions are expected somewhere within the warning area within 36 hours.

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.

According to the NHC 11 p.m. Tuesday update, Tropical Storm Isaac's center is "outrunning" the deep convection by about a degree due to strengthening westerly shear. On Thursday morning, South 17th Street, usually teeming with commuter traffic by 6:30 a.m., was almost devoid of cars.


"Hurricane Joyce is also in the Atlantic so we need to see how those two systems are going to move around each other because that could have an impact".

Tropical storm watches are in effect for Montserrat, St. Kitts and Nevis, Antigua, and Saba and St. Eustatius. Isaac should move farther away from Lesser Antilles today, and then move across the eastern and central Caribbean Sea through the weekend. Gradual weakening is forecast during the next few days. Tropical-storm force winds extend outward to 105 miles from the center.

Some flooding was forecast early in the day for parts of North Florida, but those forecasts were adjusted later to include high swells and minor coastal flooding at high tide.

Forecasters said Isaac could bring as many as 10 inches of rain to some locations, 2 to 4 feet of storm surge, and life-threatening surf conditions. A hurricane hunter plane is scheduled to investigate the system Thursday. "Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other unsafe conditions", the hurricane center briefing said. "It's just not anywhere near a level of Maria", forecaster Eric Blake said.

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