What conditions are favourable for the formation of thunderstorms? Warm humid air, conditionally unstable environmental lapse rate Calm winds and cold air, overcast cloud cover with St or As. Clear night over land, cold air and patches of fog Warm and dry air, strong inversion layer.
What conditions are mandatory for the formation of thermal thunderstorms? Conditionally unstable atmosphere, low temperature and low humidity Absolutely stable atmosphere, high temperature and high humidity Absolutely stable atmosphere, high temperature and low humidity Conditionally unstable atmosphere, high temperature and high humidity.
With regard to thunderstorms, strong up- and downdrafts appear during the... initial stage. dissipating stage. mature stage. thunderstorm stage.
Which stage of a thunderstorm is dominated by updrafts? Dissipating stage Upwind stage Mature stage Cumulus stage.
What danger is most immenent when an aircraft is hit by lightning? Rapid cabin depressurization and smoke in the cabin Surface overheat and damage to exposed aircraft parts Explosion of electrical equipment in the cockpit Disturbed radio communication, static noise signals.
Heavy downdrafts and strong wind shear close to the ground can be expected... during cold, clear nights with the formation of radiation fog. near the rainfall areas of heavy showers or thunderstorms. during approach to an airfield at the coast with a strong sea breeze. during warm summer days with high, flatted Cu clouds.
What phenomenon is caused by cold air downdrafts with precipitation from a fully developed thunderstorm cloud? Electrical discharge Anvil-head top of Cb cloud Gust front Freezing Rain.
What has to be considered when taking off in a ground inversion? Climb should be performed with the lowest possible speed and maximum power Due to low temperatures close to the ground, icing has to be expected During climb, a sudden decrease in speed and climb performance has to be expected During the climb, a sudden increase in speed and climb performance has to be expected.
What danger is most imminent during an approach to an airfield situated in a valley, with strong wind aloft blowing perpendicular to the mountain ridge? Reduced visibilty, maybe loss of sight to the airfield during final approach Formation of medium to heavy clear ice on all aircraft surfaces Heavy downdrafts within rainfall areas below thunderstorm clouds Wind shear during descent, wind direction may change by 180°.
What kind of reduction in visibility is not very sensitive to changes in temperature? Haze (HZ) Patches of fog (BCFG) Radiation fog (FG) Mist (BR).
Information about pressure patterns and frontal situation can be found in which chart? wind chart. surface weather chart. Significant Weather Chart (SWC). hypsometric chart.
Which weather chart shows the actual air pressure as in MSL along with pressure centers and fronts? Hypsometric chart Surface weather chart Prognostic chart Wind chart.
What information can be obtained from satallite images? Temperature and dew point of environmental air Turbulence and icing Flight visibility, ground visibility, and ground contact Overview of cloud covers and front lines.
What chart shows areas of precipitation? GAFOR Wind chart Satellite picture Radar picture.
What information is NOT found on Low-Level Significant Weather Charts (LLSWC)? Information about icing conditions Radar echos of precipitation Information about turbulence areas Front lines and frontal displacements.
Measured pressure distribution in MSL and corresponding frontal systems are displayed by the... prognostic chart. Significant Weather Chart (SWC). surface weather chart. hypsometric chart.
In a METAR, "heavy rain" is designated by the identifier... RA. +SHRA. SHRA. +RA.
In a METAR, "(moderate) showers of rain" are designated by the identifier... +RA. SHRA. +TSRA. TS.
What information can be found in the ATIS, but not in a METAR? Information about current weather, for example types of precipitation Operational information such as runway in use and transition level Information about mean wind speeds, maximum speeds in gusts if applicable Approach information, such as ground visibility and cloud base.
Weather and operational information about the destination aerodrome can be obtained during the flight by... VOLMET. PIREP. ATIS. SIGMET.
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