Weather and Environmental Factors Flashcards
7 cards from real ADX practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Weather and Environmental Factors flashcards as text
What weather condition is indicated when a rawinsonde observation shows a sharp temperature inversion and very low dew point spread at a low altitude?
Answer: A stable layer that suppresses convection and may trap pollutants
A temperature inversion creates a stable layer where warmer air overlies cooler air, suppressing vertical mixing and convection while potentially trapping moisture and pollutants below.
A dispatcher planning a transoceanic flight reviews a Significant Weather Prognostic Chart. Which level of chart covers flight levels from FL250 to FL630?
Answer: High-Level Significant Weather Prog
The High-Level Significant Weather Prognostic Chart covers flight levels FL250 through FL630, the primary range for high-altitude jet operations including transoceanic routes.
Which type of fog forms when cold air moves over a warm water surface, causing rapid evaporation and condensation?
Answer: Steam fog
Steam fog (also called sea smoke or Arctic sea smoke) forms when cold air flows over much warmer water, evaporating moisture that immediately condenses into low-lying fog wisps.
During pre-departure weather evaluation, a dispatcher finds that the destination has a METAR showing OVC003 and 1/4SM FG. The filed alternate is 85 NM away with METAR showing BKN020 and 3SM HZ. What is the dispatcher's primary concern?
Answer: Whether the alternate meets the regulatory weather minimums for filing as an alternate
When destination weather is at or near minimums, the dispatcher must verify that the alternate airport meets the applicable alternate minimums (precision or non-precision approach) at estimated time of arrival.
What is the significance of a 'cap' or 'capping inversion' in thunderstorm forecasting?
Answer: It suppresses convection until sufficient heat breaks through, often causing explosive severe storm development
A capping inversion suppresses convection and allows instability to build; when the cap erodes or is breached by intense surface heating, the stored energy releases rapidly, producing severe thunderstorms.
Which term describes the phenomenon where an aircraft accumulates ice on its airframe from supercooled large water droplets (SLDs) that extend beyond the protected surfaces?
Answer: Freezing drizzle icing / SLD icing
Supercooled Large Droplet (SLD) icing is especially hazardous because large droplets run back beyond de-iced/anti-iced surfaces, accumulating ice in unprotected areas and disrupting airfoil performance.
A dispatcher notes a METAR reporting 'FZRA' at the destination. Which weather condition does this represent, and why is it operationally significant?
Answer: Freezing rain — liquid rain that freezes on contact with aircraft surfaces below 0°C
FZRA (freezing rain) is liquid precipitation that freezes on contact with surfaces at or below 0°C, rapidly building clear (glaze) ice on airframes, wings, and runways, creating severe landing and taxiing hazards.