NIFE WEATHER QUESTIONS AND ANSWERS ALREADY PASSED

NIFE WEATHER QUESTIONS AND ANSWERS ALREADY PASSED What are the percentages of gases in pure, dry air? 78% nitrogen 21% oxygen 1% other gases What percent is water vapor in the atmosphere? 0-5% by volume What is the troposphere? Layer adjacent to the Earth's surface Where does all weather occur? Troposphere In the troposhpere, what happens to the temperature with an increase in altitude? Temperature decreases What are the winds like in the troposphere? Winds are light near the Earths surface and increase with altitude Where is the troposphere? (height) Average height of 36000 MSL What is the moisture content in the troposphere? Large amounts of moisture and condensation Is the troposphere higher in the summer or in the winter? Higher in the summer. Think that the air is heating up and rising the troposphere What is the tropopause? Transition zone between the troposphere and stratosphere What happens to temperature with an increase in altitude in the tropopause? Decrease? Constant Constant Where do the strongest winds occur? In the tropopause What is atmospheric pressure? What is atmospheric pressure also known as? Pressure exerted on a surface by the atmosphere due to the weight of the column of air directly above that surface As altitude increases, what happens to pressure? Decreases always What are the two standard units of pressure? Inches of mercury (in-Hg) Millibars (mb) What is station pressure? Atmospheric pressure measured directly at an airfield Which is greater, station pressure or sea level pressure? Station pressure...... stations wont be in the sea What is Sea Level Pressure? Pressure that would be measured if the station was at MSL How do stations report pressure regardless of location? In Sea Level Pressure What is Atmospheric circulation? Earth is constantly heated and cooled as it rotates. This causes ascending and descending air What are the two ways atmospheric circulation moves air? Ascending and descending currents What causes Atmospheric circulation? Wind trying to go from high pressure to low pressure. Due to the Coriolis Force What are Pressure Gradients? Spacing of isobars that represent a change in pressure over a horizontal distance. When is a Pressure Gradient Force (PGF) strong?