downwind

　 　 　

WordNet

1. with the wind; in the direction the wind is blowing; "they flew downwind"
2. towards the side away from the wind (同)lee

PrepTutorEJDIC

1. 風の方向に進む,追い風の / 風と同じ向きに,追い風で

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2016/12/21 22:18:47」(JST)

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Example image showing definitions of windward (upwind) and leeward (downwind).

Windward (pronounced /ˈwɪndwərd/) is the direction upwind (toward where the wind is coming from) from the point of reference. Leeward (pronounced /ˈliːwərd/) is the direction downwind (or downward) from the point of reference. The side of a ship that is towards the leeward is its lee side. If the vessel is heeling under the pressure of the wind, this will be the "lower side". During the age of sail, the term weather was used as a synonym for windward in some contexts, as in the weather gage.

Nautical and naval

Main article: Sailing

Windward and leeward directions are important factors (points of sail) to consider when sailing a sailing ship. Other terms with broadly the same meaning are widely used, particularly upwind and downwind.

The windward vessel is normally the more maneuverable vessel. For this reason, rule 12 of the International Regulations for Preventing Collisions at Sea stipulates that the windward vessel gives way to the leeward vessel.

Naval warfare

In warfare, a square rigged warship would often try to enter battle from the windward direction (or "hold the weather gauge"), thus gaining an important tactical advantage over the opposing warship – the warship to windward could choose when to engage and when to withdraw. The opposing warship to leeward could often do little but comply without exposing itself unduly.

This was particularly important once artillery was introduced to naval warfare. The ships heeled away from the wind so that the leeward vessel was exposing part of her bottom to shot.

Meteorological significance

Leeward and windward refer respectively to what a game stalker would call downwind and upwind. The terms are used by seamen in relation to their ships but also in reference to islands in an archipelago and to the different sides of a single island. In the latter case, the windward side is that side of an island subject to the prevailing wind, and is thus the wetter side (see orographic precipitation). The leeward side is the side protected by the elevation of the island from the prevailing wind, and is typically the drier side of an island. Thus, leeward or windward siting is an important weather and climate factor on oceanic islands.

In the case of an archipelago, windward islands are upwind and leeward islands are the downwind ones.

See also

• Barlavento (Windward) and Sotavento (Leeward) in Cape Verde Islands
• Downstream and upstream
• Lee shore
• Northwestern Hawaiian Islands, also known as Leeward Islands
• Windward Islands, Leeward Islands and Leeward Antilles (in the Lesser Antilles)
• Windward Islands and Leeward Islands (in the Society Islands)
• Foehn wind

References

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• 最大拡散半径等を求めるノモグラムの自動算出

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• 有風下で火炎風下直後に定在する火災旋風の発生メカニズムに関する実験研究 (特集 注目研究in年会2014)

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• Variations in the structure of airborne bacterial communities in a downwind area during an Asian dust (Kosa) event

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• Science of the Total Environment 488-489(1), 75-84, 2014-08-01
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• NAID 120005440328

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