You can estimate the height of cumuliform cloud bases using surface temperature/dew point spread. At what altitude above the surface would the pilot expect the bases of cumuliform clouds if the surface temperature is 82 ° and the dew point is 62 °? (AC 00-6A) List the effects of stable and unstable air on clouds, turbulence, precipitation and visibility. In general, stable air cools at a rate less than the standard lapse rate with altitude, and unstable air cools at a rate that is greater than the standard lapse rate.ġ4. The “K” index of a stability chart is the primary means of determining stability. How do you determine the stability of the atmosphere? (AC 00-6A)īy observing the actual lapse rate and comparing it to the standard lapse rate of 3.5 ° F per 1,000 feet. What factor primarily determines the type and vertical extent of clouds? (AC 00-6A)ġ3. Also, these are ideal conditions for carburetor icing.ġ2. Visible moisture in the form of clouds, dew, or fog. When temperature and dew point are close together (within 5 °), what type of weather is likely? (AC 00-6A) What does “dew point” mean? (AC 00-6A)ĭew point is the temperature to which a sample of air must be cooled to attain the state of saturation.ġ1. At what rate does atmospheric pressure decrease with an increase in altitude? (AC 00-6A)ġ0. Why do surface winds generally flow across the isobars at an angle? (AC 00-6A)ĩ. What causes the winds aloft to flow parallel to the isobars? (AC 00-6A)Ĩ. A shallow pressure gradient (isobars not close together) usually means wind speeds will be less.ħ. When isobars are spaced very close together, a steep pressure gradient exists which indicates higher wind speeds. The spacing of isobars on these charts defines how steep or shallow a pressure gradient is. If the isobars are relatively close together on a surface weather chart or a constant pressure chart, what information will this provide? (AC 00-6A) What are the standard temperature and pressure values for sea level? (AC 00-6A)Īn isobar is a line on a weather chart which connects areas of equal or constant barometric pressure.Ħ. Descending air favors dissipation of cloudiness hence the association of high pressure and good weather.Ĥ. Air moving out of a high or ridge depletes the quantity of air therefore, these are areas of descending air. Rising air is conductive to cloudiness and precipitation hence he general association of low pressure and bad weather.Ī ridge (also called a ridge line) is an elongated area of relatively high atmospheric pressure. Therefore, a low or trough is an area of rising air. At the surface when air converges into a low, it cannot go outward against the pressure gradient, nor can it go downward into the ground it must go upward. High Pressure – outward, downward, and clockwiseĪ trough (also called a trough line) is an elongated area of relatively low atmosphere pressure. Low Pressure – inward, upward, and counterclockwise State the general characteristics in regard to the flow of air around high and low pressure systems in the Northern Hemisphere. Oral Exam Preparation Questions and Answersġ.
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