Butlletí del 08/01/2015
Els alisis afavoriran previsiblement la flota durant els propers dos dies. El vent portant començarà però a amainar al voltant del sud de la latitud 10N,però les calmes equatorials estrictes no s'hi troben fins a la latitud 3N.
*** SYNOPSIS ***
00Z THURSDAY (08-JAN-2015):1) High pressure (1036mb) is near 38N/21W, holding nearly stationary and slowly strengthening with time.2) The high is providing the northern anchor for a well established trade wind zone from 35N all the way to south of 10N.3) Moderate NE trade winds are generally building north of the Canary Islands. Lighter winds are found within about 40-50nm of the African coast. Winds are expected to remain lighter closer to the coast through most of the day.4) South of the Canary Islands, the trade wind zone is wide and relatively strong, extending from the Canary Islands south/southwest beyond the Cape Verde Islands and well west to 35W.5) Note that the acceleration zones are active between the Canary Islands, with significant lulls in the lee of the islands extending up to 60nm downwind.6) Trade wind strength will generally increase with distance south to north and northwest of the Cape Verde Islands. >>>00Z FRIDAY (09-JAN-2015):1) Strong high pressure (1042mb) will be near 40N/16W.2) This high pressure will continue to drive fresh to strong NE’ly trade winds All areas south of 35N 20+ knots, and some areas with 25-30 knots. 3) The trade winds will extend all the way south beyond the Cape Verde Islands, before decelerating approaching the doldrums south of 10N.4) Some areas of near-gale winds are between the Canary Islands and downwind to just north of the Cape Verde Islands. 5) Another area of even stronger trade wind (25-30 knots) will develop north and northwest of the Cape Verde Islands.6) Wake regions downwind of the Cape Verde Islands will be active, with lulls extending over 100nm downwind of the islands. There will be zones of accelerated breeze in between the islands. 7) The strong trades are allowing for the doldrums to be well south. Winds will generally ease south of about 8N approaching Doldrums.8) The northern boundary of the doldrums will extend from 7N/20W to 4N/25W to 4N/30W to 3N/35W.00Z SATURDAY (10-JAN-2015):1) The NE trade winds will begin a very gradual easing process, but remain fresh over most of the trade wind region between the Canary Islands and 10N.2) A general right trend is expected north of 25N toward the ENE, while south of there winds remain more NE.3) Winds will be easing more quickly south of the Canary Islands to about 30W, as a area of lighter breeze expands west off the African coast.4) As noted above, wake regions of lighter and more variable wind will extend 100nm downing of Cape Verde Islands. Accelerated trade wind flow will persist between the islands. 5) The northern boundary of the doldrums will extend from 7N/20W to 3N/25W to 3N/30W to 3N/35W. This will likely be the most southward extent of the doldrums, with a slow northward drift expected to develop.00Z SUNDAY (11-JAN-2015):1) The trade winds will continue to slowly ease from east to west. 2) The easing trend will be most pronounced east of abuot 21W and south of 25N as an area of lighter breeze over western Africa starts to expand westward.3) Note that winds will tend to back NNE/N where it is easing most abruptly, this due to a coastal trough develop along Africa.4) Firmer (stronger) breeze will hold west of the Cape Verde Islands, especially west of about 29W.5) The northern boundary of the doldrums will extend from 7N/20W to 4N/25W to 3N/30W to 3N/35W, continuing is slow northward drift.6) The doldrums region of light air separating it from the SE trades will increase to about 5 deg latitude at 20W to 2-3 degs latitude at 25W. The zone will of course be narrower in the west, closer to 30W.