Term
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Definition
| Pressure differences induced by thermal changes. |
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Term
| Name the three characteristics of wind. |
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Definition
| Speed, direction, and steadiness. |
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Term
| How may wind speed be stated? |
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Definition
| Knots, miles per hour, or Beaufort Scale. Note, in Japan meters per second is also used. |
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Term
| How is the direction of wind described? |
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Definition
| The true direction from which it comes. This is in opposition to how current is described. |
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Term
| How is the direction of current described? |
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Definition
| The direction toward which it flows. This is in opposition to how wind is described. |
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Term
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Definition
| The velocity and direction of the wind that is felt by a stationary observer. |
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Term
| What decreases wind velocity and what is the influence at deck level? At masthead? |
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Definition
| Friction with the earth's surface or water. The wind's velocity at deck level will be slower than masthead. |
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Term
| What does high terrain next to a body of water cause? |
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Definition
| A wind shadow that extends approximately 5 times the height of the terrain's height. |
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Term
| Name two ways in which terrain affect wind. |
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Definition
| Bluffs cause a pocket of stagnant air against the bluff. Valleys in a bluff may cause strong gusts. |
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Term
| What causes a sea breeze and when is a sea breeze likely to occur? |
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Definition
| Land heats faster during daylight hours. The breeze stars in late morning and continues until late afternoon. |
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Term
| What causes a land or offshore breeze? |
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Definition
| Land cools faster during nighttime hours. |
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Term
| What can affect sea and land breezes? |
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Definition
| Larger weather patterns and the burning off of cloud cover. |
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Term
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Definition
| The wind caused by a boat moving through the air, otherwise known as a boat's speed that is also in opposite direction to the boat's course. |
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Term
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Definition
| The combination of true wind and boat wind. |
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