Jose Antonio Vazquez
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Tema 1 Meteo Quiz on 10. Wind, created by Jose Antonio Vazquez on 12/30/2017.

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Jose Antonio Vazquez
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10. Wind

10. Wind

Question 1 of 10

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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:

Select one of the following:

  • 360/12.

  • 080/18.

  • 180/18.

  • 080/06.

Explanation

Question 2 of 10

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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:

Select one of the following:

  • 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.

  • The frictional effect at the surface, causing the surface isobars to curve more than those at 2000 ft.

  • 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.

  • The effect of the cyclostrophic force, which is strongest at the surface due to increased curvature.

Explanation

Question 3 of 10

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3- When a Fohn wind occurs:

Select one of the following:

  • There are unstable conditions on the downwind side of the mountain.

  • Air is cooled mainly at the DALR on the upwind side of the mountain
    and is heated at the SALR on the downwind side.

  • Windspeed must be at least 15 kt at the surface increasing with height
    and maintaining direction.

  • 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.

Explanation

Question 4 of 10

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4- The geostrophic wind blows:

Select one of the following:

  • Parallel to curved isobars.

  • When pressure values are changing rapidly.

  • In a tropical revolving storm.

  • When geostrophic force and pressure gradient force are equal.

Explanation

Question 5 of 10

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5- A Katabatic wind can result in:

Select one of the following:

  • An increase in temperature.

  • Fog in the valley at night.

  • Thunderstorms in summer.

  • Stratus cloud.

Explanation

Question 6 of 10

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6- A strong wind that rises suddenly, lasts for some minutes and dies comparatively suddenly away is called:

Select one of the following:

  • A gust.

  • A squall.

  • A gale.

  • A blast.

Explanation

Question 7 of 10

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7- A ravine or valley wind:

Select one of the following:

  • Is a wind blowing at increased speed along a valley.

  • Is a wind blowing from a hill to a valley below.

  • Is a wind blowing up a hill from a valley.

  • Is a wind blowing at reduced speed along a valley.

Explanation

Question 8 of 10

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8- Which of the following is true of a land breeze?

Select one of the following:

  • it blows only at noon

  • it blows from land to water

  • it blows from water to land

  • it blows by day

Explanation

Question 9 of 10

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9- What characteristics will the surface winds have in an area where the isobars on the weather map are very close together?

Select one of the following:

  • Strong and flowing across the isobars.

  • Very weak but gusty and flowing across the isobars.

  • Moderate and flowing parallel to the isobars.

  • Strong and flowing parallel to the isobars.

Explanation

Question 10 of 10

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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).

Select one of the following:

  • 200 km/h.

  • 175 km/h.

  • 150 km/h.

  • 65 km/h.

Explanation

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