IATRA Meteorology 2

IATRA Meteorology 2 The icing intensity associated with a rate of accumulation which would be hazardous during even short encounters and requiring the use of de-icing equipment would be Correct Ans - moderate Frost adhering to the underside of a wing with a grain growth from .010 to .015 inches in diameter has Correct Ans - no major effect on lift but will result in a second segment climb limiting weight penalty Weather radar works according to which principle of Correct Ans - reflecting electronic beams Rainfall gradient is defined as the rate Correct Ans - at which the rainfall increases or decreases over a specific distance and directly related to the amount of turbulence expected When using ISO-Echo contours to predict turbulence it is best to Correct Ans - avoid areas with thin white bands surrounding an iso-echo hole. When receiving information regarding storm cells it is important to tilt the receiving antennae Correct Ans - in a climb because the antennae moves up with the aircraft Attenuation refers to the Correct Ans - weakening of a radar signal as it becomes absorbed by surrounding moisture When flying above the freezing level avoid storms by at least Correct Ans - 10 NM What are some limitations of weather radar? Correct Ans - The ability of radar to see through clouds is reduced proportionally as the rate of rainfall increases, Rainfall gradient and turbulence is high when the rainfall increases or decreases rapidly over short horizontal distances and Turbulence is proportional to the rate at which the rainfall increases or decreases over a specific distance which is referred to as rainfall gradient A black hole appears on the airborne weather radar display in flight which identifies Correct Ans - the hard core of a thunderstorm Weather radar is able to detect the . . . . . drops of water, snowflakes, sleet, or hail. Correct Ans - number, size, and reflectivity of Which radar system produces the fastest image scan? Correct Ans - PPI (Plan Position Indicator) Anomalous Propagation causes a beam of radiation to Correct Ans - curve downwards A radar shadow is an area Correct Ans - of severe weather During which stage of storm cloud formation does rain begin? Correct Ans - mature Downdrafts dominate the base of the cloud during the Correct Ans - Dissipating Lightning effects aircraft Correct Ans - as it can puncture the skin of an aircraft, damage electronics, and cause fires During the cumulus stage of a thunderstorm as the water vapour condenses into liquid latent heat is Correct Ans - released and the surrounding air is warmed During the mature stage as warmed air continues to rise until it reaches existing air which is Correct Ans - warmer and the air can rise no further In the dissipating stage of a thunderstorm as the precipitation falls through the cloud the cloud Correct Ans - cools and downdrafts dominate A greater intensity of turbulence is found while flying Correct Ans - downwind into a mountain wave