The Great Southern Route : 2008 - 2009
the trough will normally be found closer to 10N, drifting southward later in the year, and reaching its southernmost location (near 05N) during December/January. Cooler waters temperatures west of the Baja Peninsula, in particular those associated with the California Current (off the Baja Peninsula), will normally induce a weakening of tropical cyclones as they move further west into this region. However, warmer water temperatures and lighter winds aloft can and do allow for tropical cyclone development during the summer months in more southern waters, mainly south of 20N. Such cyclones that form in this region will in the vast majority of cases track westward, weakening and/ or passing south of the Hawaiian Islands. NW-N-NE winds dominate across waters between the Baja Peninsula and approximately 115W-120W, generally "moderate" to "fresh" in intensity. However, surges of higher winds will occur, mainly during the late autumn, winter, and spring months, as surges of cooler air move in behind cold fronts. Large NW-N-NE swells will accompany wind surges, often near and in excess of 10 feet, though will tend somewhat lower and longer-period in more southern waters. Easing of winds and an abatement of seas will occur as ridging further west weakens, and as cold fronts approach the region from the north and west. NE-E trade winds are dominant further west toward the Hawaiian Islands and in more southern waters (to 10N), speeds generally no more than force 5-6, with combined seas generally as high as 7-8 feet. However, merging of high pressure ridges will bring about periods of higher NE-E'lys, at times reaching gale or near gale force (force 7-8), along with larger NE-E swells, as much as 3-5 feet higher than those mentioned under "normal" circumstances. The approach and passage of stronger cold fronts north of the area will bring breaks in the NE-E wind/sea regime, normally lasting for 1-2 days at a times over a given location. Winds will actually tend to vary from E-SE-S becoming "gentle" or "moderate", speeds mainly from force 3-5 and no more. Combined seas, in turn, will become more E-SE in direction and abate, generally not exceeding 6 feet, especially in more prolonged lulls in winds. The largest of these combined seas will tend to be mainly swell, with little wind driven "chop" on top of the swells. Once you are south of 10N, you are getting close to and within the "Doldrums". Winds become lighter, and vary from NE-SE-S, with NE-E winds found north of the Equatorial Trough axis, and E-SE-S winds found further south. Wind speeds within this region tend to be from force 3-5, and near/below the low end of this range along or very near the trough axis. Combined seas become long-period and tend mostly swell with NE-SE-S seas averaging from 3-6 feet. Slightly higher long- period sets (generally 1-2 feet higher) will occur in higher trade wind surges, typically in NE-E sets from high pressure to the north, or E-SE-S sets from ridging further south, in both instances occurring when ridging is stronger (toward/during the winter season). Disorganized squalls within the Equatorial Trough will bring localized periods of higher winds and combined seas (both in and near squalls). Squalls often bring periods of reduced visibility, with heavy/severe squalls bringing visibilities below 2 nautical miles at times. Prevailing currents more or less will fall in line with dominant wind directions. The already- mentioned California Current runs from northwest to southeast, more or less parallelling the west coast of the Baja Peninsula and found just offshore. Increases in current speed and a southward "expansion" of the current will occur during stronger wind surges, associated with the passage of cold fronts during the period from late autumn through early spring. Further west, currents become a more favorable southwest to westward moving direction, generally running between 0.4 and 0.7 knots. As one might imagine, the key in finding optimal Sure, your antifouling may work when your boat is moving, but what about when it sits in the marina? The moment your boat hits salt water, the patented SPC technology in Micron 66 switch- es on - and stays on. This award winning antifouling uses a unique chemical reaction to continuously release fresh biocide. Unlike conventional antifouling, Micron 66 does not rely on the movement of your boat to make it work, so it stays 100% active even when your boat is not. ® , International® and Biolux® are registered trademarks of Akzo Nobel. For more information: yachtpaint.com Free Technical Helpline: Australia 1800 251 431 New Zealand 0800 808 807 Pacific Islands + 61 7 3892 8888 To you, this may not look like an action shot.
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