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Tropical Waves
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1- The Secrets of Tropical Waves

2- TheCharacter of a Tropical Wave

3- The Breeding ground


The Secrets of Tropical Waves


The northern part of the Atlantic Ocean is a naughty sail area. North of 40 degrees North averages three depressions a week from the American coast to Europe. South of 30 degrees North the phenomena 'tropical wave' are troubling and Caribbean islands like Cuba, the Bahamas, the coast of Florida and Bermuda are regularly visited by hurricanes. Furthermore it is hard to cross the ITCZ to southern latitudes due to its frequent calms. Dutch born journalist, author and ocean sailor Peter Stuivenberg makes some notes.

T
he bright blue painted sky atproduces fluffy clouds thline up like parading soldiers. The patterns look alike converging lines on a dartboard. One path shows the blue sky. In another path ‘fluffs’ lined up. Than, the next one, a blue sky appears again. All lined up, all converging to a center. Maaike visions a beauty beyond imagination. Words are improper; silence takes over. What is the message of this unexpected thrill of nature?
   
Maaike watches almost in trance the heavenly ‘gallery of paintings’, makes some photographs and writes later on the remembrance of the past in the ships logbook. Position 8 degrees North and 28 degrees West. Course 200 degrees true, heading for Natal in Brazil. Date the fourth of June 2002, the official beginning of the cyclone season. "To the south we face the doldrums and a bit to the east on 15 degrees North and 25 degrees West we passed the Cape Verde Islands. There is no wind. The humidity is 96 percent. It is sweating hot and I feel like entering a sauna. To the west I see a lot of convection activity and the seawater temperature shows 27 to 28 degrees Celsius".

Troubling by a lack of answers on the ‘Why, What, When, Who and What’ questions she studies some meteorological books. Finally she finds what she is looking for and yells: "Peter listen, you everlasting snoring beast!radiant Cirrus It has something to do with hurricanes!"
‘It’ refers to the converging stripes of clouds and blue sky. I open my eyes with the knowledge that I have to absorb some information: "Here, it is all written". Maaike taps the book. " The day before a tropical cyclone is born will be hot and humid. The atmosphere is depressing. Quite unexpected cirrus clouds will invade the hemisphere and these clouds will converge to a point on the horizon that directs the center of the storm".
Maaike is enthusiastic, while I still try to get the picture. I feel in the middle of awakening. The thrill of Maaike’s voice confuses. A tropical cyclone? No, impossible. True the ocean is steaming and true she watches radiant cirrus. Nevertheless, it is too early in the season. Besides that I did not intercept meteorological warnings over the Inmarsat-C and there does not exist a low depression cell in this area or any another tropical disturbance. Nature is just mistaken. That is it. I feel satisfied that there is nothing to worry about. Even if nature should be right a stormy problem will lie to the West of our position and we are heading South. You see?! Point taken. No worries. We discuss the situation and Maaike, disappointed, bakes pancakes while I check the Inmarsat-C for the latest meteorological warnings.
While Maaike explains why the pancakes this time are not soaked with vegetable oil, I reread the messages issued for Navarea ll, an area that is controlled by Meteo-France in Toulouse (France).


3 June 2002, 08:54:14
ITCZ along 3N 1W, 4N 10W, 5N 20W and 5N 45W.

Nothing wrong, ahh?!

3 June 2002, 21:09:22
ITCZ along 4N 2W, 2N 17W, 5N 26W and 6N 48W.

Still everything ok.

4 June 2002, 08:54:13
ITCZ along 5N 1W and 5N 40W. Low 1007 15N 12W, deepening, expected 1003 HPA(mbar) at 4 June, 18.00 UTC.

A deepening low 7 degrees North of our position and 16 degrees to the West. So what? I wait half an hour and pick up the latest forecast:

4 June 2002, 20:54:14
ITCZ along 5N 1W and 5N 40W. Tropical wave nears 26W south of 11N moving west 10/15 knots. Low 1012 08N 15W moving west, expected 1012 HPA 5N 27W by 5 June, 12.00 UTC.

What?!! A low-pressure area speeds up from the African continent to a spot just 2 degrees to the South of our position! In addition, 2 degrees to the West a tropical wave has been born. My goodness! Nature just fills in the two missing ingredients for a tropical party. Within a minute the yacht points 180 degrees into another direction: Northeast. If that low will merge with the southern top of the ‘tropical wave’, close to the ITCZ, we are getting closer and closer to the ideal breeding ground of a tropical storm or even a tropical cyclone.
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