The mammoth waves were spotted early Wednesday in the storm's northeast quadrant, said the NHC's Tropical Analysis and Forecast Branch, which has been documenting Florence's waves all week.
Maui Mayor Alan Arakawa said he hoped the effects of the storm would be limited. Then Florence is expected to move to the northwest toward Columbia, SC on Saturday, weakening as it does so, before continuing into the SC upstate by Sunday, undergoing further weakening. Nonetheless Helene is bringing with her very strong wind with gusts up to 120km/h, heavy rain and waves of between 6 and 8m high on some islands.
Tropical Storm Isaac had maximum sustained winds of 70 miles per hour Tuesday morning, which made it a tropical storm instead of a Category 1 hurricane on the Saffir-Simpson scale. This means that tropical storm conditions are expected to make landfall between 36- and 48-hours.
On that path Isaac will move across the central Lesser Antilles and into the Caribbean on Thursday. It was fluctuating between a Category 3 and Category 4 storm but was threatening to bring strong winds, heavy rains, unsafe storm surges and significant and possibly life-threatening flooding to the Carolinas. "Storm surge is the main cause of the death and destruction associated with hurricanes", NBC News explained after Hurricane Ike hit Texas. "Catastrophic flash flooding and prolonged significant river flooding are likely", the Hurricane Center said.
According to the Miami based National Hurricane Center, at 5 p.m. Antigua time yesterday, Tropical Storm Isaac was located about 300 miles east of Martinique and was moving rapidly west.
They also said that Isaac is expected to produce total rainfall accumulations of three to five inches with isolated amounts near ten inches across the Leeward Islands late this week, with one to two inches anticipated across the Windward Islands.
Tropical Storm Watches were also discontinued for St. Maarten, St. Martin, Saba and Eustatius.