11823046
Description
Quiz by Jose Antonio Vazquez, updated more than 1 year ago
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Created by Jose Antonio Vazquez
almost 7 years ago
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Question 1
Question
1- On a day in summer with a slack pressure gradient, an airfield on the south coast of England has a surface W/V of 080/06 at dawn. The coast/line is in an East/West direction. The most probable W/V at noon would be:
Answer
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360/12.
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080/18.
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180/18.
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080/06.
Question 2
Question
2- The surface wind direction in the Northern Hemisphere is backed from the 2000 ft wind by an average of 30o over land due to:
Answer
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Friction reducing the wind speed, thus reducing the geostrophic force, allowing the pressure gradient force to pull the wind across the isobars towards low pressure.
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The frictional effect at the surface, causing the surface isobars to curve more than those at 2000 ft.
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The geostrophic wind only flowing between straight and parallel isobars with an unchanging pressure gradient with time, whereas the surface pressure gradient changes diurnally with surface heating.
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The effect of the cyclostrophic force, which is strongest at the surface due to increased curvature.
Question 3
Question
3- When a Fohn wind occurs:
Answer
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There are unstable conditions on the downwind side of the mountain.
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Air is cooled mainly at the DALR on the upwind side of the mountain and is heated at the SALR on the downwind side.
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Windspeed must be at least 15 kt at the surface increasing with height and maintaining direction.
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Air is cooled mainly at the SALR on the upwind side of the mountain and is heated mainly at the DALR on the downwind side.
Question 4
Question
4- The geostrophic wind blows:
Answer
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Parallel to curved isobars.
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When pressure values are changing rapidly.
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In a tropical revolving storm.
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When geostrophic force and pressure gradient force are equal.
Question 5
Question
5- A Katabatic wind can result in:
Answer
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An increase in temperature.
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Fog in the valley at night.
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Thunderstorms in summer.
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Stratus cloud.
Question 6
Question
6- A strong wind that rises suddenly, lasts for some minutes and dies comparatively suddenly away is called:
Answer
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A gust.
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A squall.
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A gale.
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A blast.
Question 7
Question
7- A ravine or valley wind:
Answer
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Is a wind blowing at increased speed along a valley.
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Is a wind blowing from a hill to a valley below.
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Is a wind blowing up a hill from a valley.
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Is a wind blowing at reduced speed along a valley.
Question 8
Question
8- Which of the following is true of a land breeze?
Answer
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it blows only at noon
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it blows from land to water
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it blows from water to land
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it blows by day
Question 9
Question
9- What characteristics will the surface winds have in an area where the isobars on the weather map are very close together?
Answer
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Strong and flowing across the isobars.
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Very weak but gusty and flowing across the isobars.
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Moderate and flowing parallel to the isobars.
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Strong and flowing parallel to the isobars.
Question 10
Question
10- Taking into account the cyclostrophic balance, what will be the intensity of wind (in km/h) if we consider a vortex in rotation of 100 m radius with a variation of 4 hPa per 100 m? (You should consider 1.225 kg/m3 as the density of the air).
Answer
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200 km/h.
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175 km/h.
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150 km/h.
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65 km/h.
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