Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.
By: Dr. Jeff Masters , 3:09 PM GMT on September 01, 2007
Tropical Storm Felix lashed the islands of Grenada, Trinidad, Tobago, Barbados, and St. Vincent and the Grenadines with winds near tropical storm force and torrential rains this morning. Visible satellite loops show that Felix is a small storm, but is steadily expanding in size and growing more organized. Low level spiral bands have formed on the eastern side, and there is one respectable upper-level outflow jet that has formed to the storm's north. Dry air on the northwest side of Felix continues to hamper its intensification, but the storm is small enough that dry air drawn in from the north coast of South America has not been a problem.
Felix is a major danger to Central America
The latest GFDL model forecasts that Felix will intensify into a Category 2 hurricane by the time it makes landfall in Belize Wednesday. The SHIPS intensity model is more aggressive, making Felix a Category 3 hurricane. Given that the environment in the Caribbean is much the same as we saw for Dean, I think we can expect a steady intensification of Felix to a Category 2 or 3 storm when it approaches the Honduras/Nicaragua border Monday night. On the current projected track of Felix, it would pass just north of the coast of Honduras, which would be an extremely dangerous situation for that country. Hurricane Fifi of 1974 passed along the north coast of Honduras in 1974 as a Category 2 hurricane (Figure 1), and dumped up to 24 inches of rain on the mountainous country. The resulting landslides and floods killed an estimated 8,000 people--the fourth deadliest hurricane disaster in the Atlantic basin. There is one important difference between Fifi and Felix--Fifi was moving slower, about 11 mph, Felix is expected to move past Honduras at about 17 mph, so will not linger as long to dump heavy rains. Even so, Felix's rains could reach 10-15 inches over Honduras, Nicaragua, Guatemala, and Belize. Officials in those nations need to prepare now for the possibility that Felix could bring a major flooding disaster to their nations.
Figure 1. Track of Hurricane Fifi of 1974, which killed 8000 people in Central America. Fifi was the fourth deadliest hurricane in Atlantic history.
Felix's threat to other locales
Felix should being winds of tropical storm force to Aruba, Bonaire, and Curacao as it passes to the north. These islands, and the northern coast of Venezuela, will also get heavy rains, but Felix should not cause any serious wind damage or floods in those areas. The ridge of high pressure that is steering Felix to the west is strong enough that a northward deviation of the storm into Jamaica and the Cayman Islands is unlikely. If Felix is going to deviate from the projected NHC forecast the next two days, I think a southward deviation into Nicaragua is more likely.
If Felix does stay far enough north to make it into the Western Caribbean on Tuesday and Wednesday, there is a trough of low pressure forecast to swing north of the region that could turn Felix on a more northwesterly track into the Gulf of Mexico. The models are split on this, and we'll have to wait and see. Those of you planning on being in Cancun or Cozumel on Wednesday should pay close attention to Felix.
The NOAA jet's first flight will be Sunday morning.
Links to follow today:
Current conditions on Aruba, Bonaire, and Curacao
A tropical wave in the mid-Atlantic, halfway between Africa and the Lesser Antilles, has developed a closed circulation and some heavy thunderstorm activity near the center. This disturbance has been labeled "98L" by NHC this morning. The disturbance is under about 20 knots of winds shear from strong upper-level winds from the east-southeast, but this shear is forecast to gradually slacken over the next few days, and should be below 10 knots by Monday night, and under 5 knots by Wednesday. 98L is a threat to develop into a tropical depression as early as Monday. The 12Z (8am EDT) runs of the GFDL and HWRF models both develop 98L into a tropical storm, but keep it below hurricane strength. The storm will be approaching the Lesser Antilles Islands on Wednesday or Thursday. Given 98L's more northerly starting location, it may eventually affect Puerto Rico.
My next update will be Sunday by noon EDT.
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