Meteorology Quiz

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

• Moderate and blowing parallel to the isobars.

• Very weak but gusty and blowing somewhat across the isobars.

• Strong and blowing parallel to the isobars.

• Strong and blowing somewhat across the isobars.

What is the approximate speed of a 40 kt wind, expressed in knots?

• 55 m/s

• 20 m/s

• 80 m/s

• 20 km/h

What relationship exists between the wind at 3000 feet and the surface wind?

• They are practically the same, except when eddies exist, caused by obstacles

• The wind at 3000 ft is parallel to the isobars and the surface wind direction is across the isobars toward the low pressure and the surface wind is weaker.

• The surface wind is veered compared to the wind at 3000 feet and is usually weaker.

• They have the same direction, but the surface wind is weaker, caused by friction

Which forces are balanced in the case of geostrophic winds?

• Pressure gradient force, Coriolis force, centrifugal force.

• Pressure gradient force, centrifugal force, friction force.

• Friction force, pressure gradient force, Coriolis force.

• Pressure gradient force, Coriolis force.

At 2000 ft above the sea in the northern hemisphere the gradient wind of a cyclonic pressure distribution is 350/24. At the same position the surface wind would approximate.

• 340/20

• 030/20

• 030/28

• 340/28

If London reports a wind of 19015KT on the META, what wind velocity would you expect to encounter at a height of 2000 feet above the ground?

• 16020KT

• 22010KT

• 22030KT

• 25025KT

The wind tends to follow the contour lines (isohypses) above the friction layer because...

• the coriolis force acts perpendicular on a line that connects high and low pressure system

• the friction of the air with the earth's surface gives the airflow a diversion perpendicular to the gradient force.

• the coriolis force tends to balance with the horizontal pressure gradient force

• contour lines are lines that connect points with the same wind speed in the upper air

What prevents air from flowing directly from high-pressure areas to low-pressure areas?

• Surface friction

• The pressure gradient force

• Centrifugal force

• Coriolis force

In the lower layers of the atmosphere due to friction the wind is deflected towards the low pressure area because:

• wind speed is lower due to friction and therefore the coriolis force is smaller

• wind speed is lower due to friction and therefore the coriolis force is greater

• turbulence is formed and pressure increases

• turbulence is formed and pressure decreases

Wind would be reported in MET REPORT when METAR is EYVI METAR 230920Z 10011KT 9999 NCD 06/M04 Q1025=

• 15011KT

• 14011KT

• 10011KT

• 09011KT