Aviation Weather and Meteorology Flashcards

What does METAR stand for?

Answer: Meteorological Aerodrome Report

METAR stands for Meteorological Aerodrome Report — it is the standard aviation surface weather observation format.

In a METAR, what does 'OVC010' mean?

Answer: Overcast at 1,000 feet AGL

OVC010 means an overcast sky layer with its base at 1,000 feet AGL (the number is in hundreds of feet).

What weather product provides a forecast of expected weather along a specific route of flight?

Answer: Area Forecast (FA)

The Area Forecast (FA) provides a forecast of clouds and general weather conditions over an area, useful for route planning.

What is a SIGMET?

Answer: A forecast for significant meteorological conditions hazardous to all aircraft

A SIGMET (Significant Meteorological Information) warns of weather conditions that are hazardous to all aircraft, such as severe turbulence or icing.

What type of icing is most hazardous because it accumulates rapidly and is difficult to remove?

Answer: Clear ice

Clear ice (also called glaze ice) is most hazardous because large supercooled water droplets spread before freezing, creating a heavy, clear accumulation that disrupts airflow.

What is the significance of a temperature-dewpoint spread of 2°C or less?

Answer: High probability of fog or low clouds forming

When temperature and dewpoint are within 2°C of each other, the air is near saturation and fog or low cloud formation is likely.