10. Wind

Jose Antonio Vazquez
Quiz by Jose Antonio Vazquez, updated more than 1 year ago More Less
Jose Antonio Vazquez
Created by Jose Antonio Vazquez almost 2 years ago
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Meteo Quiz on 10. Wind, created by Jose Antonio Vazquez on 12/30/2017.
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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
  • 360/12.
  • 080/18.
  • 180/18.
  • 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
  • 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.

Question 3

Question
3- When a Fohn wind occurs:
Answer
  • 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.

Question 4

Question
4- The geostrophic wind blows:
Answer
  • Parallel to curved isobars.
  • When pressure values are changing rapidly.
  • In a tropical revolving storm.
  • When geostrophic force and pressure gradient force are equal.

Question 5

Question
5- A Katabatic wind can result in:
Answer
  • An increase in temperature.
  • Fog in the valley at night.
  • Thunderstorms in summer.
  • Stratus cloud.

Question 6

Question
6- A strong wind that rises suddenly, lasts for some minutes and dies comparatively suddenly away is called:
Answer
  • A gust.
  • A squall.
  • A gale.
  • A blast.

Question 7

Question
7- A ravine or valley wind:
Answer
  • 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.

Question 8

Question
8- Which of the following is true of a land breeze?
Answer
  • it blows only at noon
  • it blows from land to water
  • it blows from water to land
  • 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
  • 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.

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
  • 200 km/h.
  • 175 km/h.
  • 150 km/h.
  • 65 km/h.
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