easterly wave

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easterly wave

[′ēs·tər·lē ′wāv]
(meteorology)
A long, weak migratory low-pressure trough occurring in the tropics.
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A strong tropical wave is affecting the island and heavy showers and possible thunderstorms have been forecast.
According to the Meteorological Department of Sint Maarten, an active Tropical Wave is influencing the weather.
A tropical wave of low pressure stirring off the coast of Africa could eventually form a storm to rival Ophelia, which battered Ireland with gusty winds and heavy rain last October.
"Thunderstorm activity associated with a tropical wave located between north-central Cuba and the central Bahamas is gradually becoming better organized, and upper-level winds are also becoming more favorable," (https://www.nhc.noaa.gov/mobile/refresh/MIATWDAT+html/MIATWDAT_010600.html) NHC said Sunday.  "A tropical depression is likely to form during the next day or so while the system moves west-northwestward across the northwestern Bahamas, southern Florida, and the Florida Keys."
These storms include the hurricane with sustained winds of 65 knots or more, the tropical storm with 35- to 64knot winds, the tropical depression with winds 20 to 34 knots, and the tropical wave or easterly wave with winds less than 20 knots.
September winds are mostly on the calmer side, except for those associated with a tropical wave or tropical system that passes through.
Tropical storm Lee formed on September 2nd from a broad but disorganized tropical wave that entered the Western Caribbean in late August.
HIt was described as a mere "tropical wave" when we were first learned it was 450 miles away and approaching the coast of Barbados.
On Sunday, Earl was still a weaker tropical wave but knocked down power lines and started a fire that killed six passengers on a bus filled with people returning from a beach excursion.
Here you will find the largest covered waterslide paradise in the Benelux and we completed our days with a splash in the tropical wave pool.
"It started its journey towards YorKshire many WEEKs ago in what meteorologists call an African 'tropical wave'.