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Douglas Harper's Etymology Dictionary
westerlies

prevailing winds in certain latitudes, 1876, from westerly (see west).

Wiktionary
westerlies

n. (plural of westerly English)

Wikipedia
Westerlies

The Westerlies, anti-trades, or Prevailing Westerlies, are prevailing winds from the west toward the east in the middle latitudes between 30 and 60 degrees latitude. They originate from the high-pressure areas in the horse latitudes and tend towards the poles and steer extratropical cyclones in this general manner. Tropical cyclones which cross the subtropical ridge axis into the Westerlies recurve due to the increased westerly flow. The winds are predominantly from the southwest in the Northern Hemisphere and from the northwest in the Southern Hemisphere.

The Westerlies are strongest in the southern hemisphere and at times when the pressure is lower over the poles, while they are weakest in the northen hemisphere and when pressures are higher over the poles. The Westerlies are particularly strong in areas where land is absent, because land amplifies the flow pattern, making the current more north-south oriented, slowing the Westerlies. The strongest westerly winds in the middle latitudes can come in the Roaring Forties, between 40 and 50 degrees latitude. The Westerlies play an important role in carrying the warm, equatorial waters and winds to the western coasts of continents, especially in the southern hemisphere because of its vast oceanic expanse.

Usage examples of "westerlies".

Our worst troubles would be up in the westerlies, where we should this time be exposed to the unpleasant possibility of having to beat.

There was no music when they reached the westerlies either, for they were blowing briskly with a little north in them, so briskly that the Surprise went bowling along under close-reefed topsails with the wind on her quarter at nine and even ten knots, wallowing at the bottom of her long roll and pitch in a way that did her little credit.

The ship flew before the strong westerlies and we sailormen were up and down the rigging like monkeys, often led by the fearless Captain himself, shortening or furling sails when gales blew, shaking them out when the wind slackened.

Cape Horn a hundred miles to the south, the yards and sails were adjusted and we began the long reach up the coast of South America, still using the westerlies blowing off the shores of Patagonia, sailing north.

They would be over Xanthe for some days, if the prevailing westerlies held true.

Westerlies from the Pacific pile up tremendous waves all along your exit from the passage.

But the eastern wall of Echus Chasma stood right in the path of the prevailing westerlies that came pouring down the Tharsis Bulge, causing them to shoot up in the most astonishingly powerful updrafts.

The prevailing westerlies drove air masses up over the Hellespontus, so that dramatic fronts of cloud over the ice were part of their daily life, but some clouds were special- metallic.

The prevailing westerlies drove air masses up over the Hellespontus, so that dramatic fronts of cloud over the ice were part of their daily life, but some clouds were special—.

It was afternoon, and the prevailing westerlies were beginning to sweep down the slope of Tharsis, bringing with them dust from the impacts.

The mutated poverty grasses were planted first along the downwind (slipface) of the chosen dunes that stood across the path of the prevailing westerlies.

Mars's prevailing westerlies strike Olympus Mons, and the air rises, but does not flow over the peak.

With the steady westerlies and the west-wind drift this is the quickest way from New South Wales to the Cape.