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16 Cards in this Set
- Front
- Back
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Wind flows from ____ to ____ |
HPA to LPA |
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Warm air ____ and cool air ____ |
Rises; sinks |
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The observation of wind in the absence of wind-speed measuring instrument shall be made by estimation of the wind force using the |
Beaufort Scale of Wind Force |
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The standard exposure of the wind instrument is _____ meters above the ground and is installed in *_______. |
10 meters; Open Terrain |
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The wind shall be observed over a _____ minute period for surface observation purposes. |
10 |
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_____ is reported when the average speed is less than 0.05 mps. |
Calm |
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Wind directiin is determined from where the wind is _____. It is also determined with reference to the_____ and expressed in nearest _____ degrees. |
Coming from; True North; 10 degrees |
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_____ is a definite change in general direction from which the wind is coming and change in direction is 30 degress or more. Moreover, the mean wind speed before (or after) the change is ____ or more. |
Wind shift; 8 mps |
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The essential difference between gust and squall is the duration of the ____. |
Peak wind speed |
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_____ is air that is moving horizontally, parallel to the ground. |
Wind |
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____ has a sensor with a streamlined body and a vertical tail to detect wind direction and a sensor in the form of a propeller to measure wind speed integrated into a single structure. |
Aerovane |
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*For aeronaurical purposes, eind may be averged for ____ minutes. |
Two |
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* ____ is a positive or negative departure of wind speed from its mean value lasting for not more than ___ minutes. |
Gust; 2 |
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* Anegative gust is a decrease of wind speed and is termed as ___. |
Lull |
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*For gust: There are _____ marked postive peaks, one of which is > ___ mps. The variation between peak and lull is _____ mps or more. The interval between prak and lull do not exceed ____ seconds. |
Three or more; 8; 5; 2 |
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* ____ are sudden increase of wind speed rising to ____ mps or more and lasting for ____ min or longer. |
Squalls; 5; 1 |
