Met Flashcards
What layers does the atmosphere on Earth have (from low to high altitude)?
- Troposphere
- Stratosphere
- Mesosphere
- Thermosphere
- Exosphere
Dry gasses and their percentage
Nitrogen - 78%
Oxygen - 21%
Other gasses - 1%
What 5 meteorological stats does an aircraft meassure and at what rate does the aircraft send it?
- Temperature
- Pressure
- Wind
- Humidity
- Density
Every 30 min
Pressure formula?
Pressure = depth * density
ICAO ISA
- pressure
- Base temperature
- Density
- Pressure lapse rate
- Temperature lapse rate
- pressure: 1013,25 hPa
- Base temperature: 15 degrees Celcius
- Density: 1,225 kg/m3
- Pressure lapse rate: 27 ft/hPa
- Temperature lapse rate: 1,98 degrees Celcius per 1000 feet
What are the two types of measurement equipment used to measure wind?
Anemometer
Windsock
What are the two types of measurement equipment used to measure horizontal visibility?
Transmissometer
Scattermeter
Honorable mention: looking out of the window
What is the measurement equipment used to measure the cloud base altitude?
Ceilometer
What is the measurement equipment used to measure air temperature?
Thermometer
What is the measurement equipment used to measure the dew point temperature?
Hygrometer
(Two types: hair hygrometer and wet/dry bulb hygrometer)
What are the two types of measurement equipment used to measure pressure?
Dual sensor
Barometer
What does an Automated Weather Observation System (AWOS) measure?
Everything meteorological:
Wind
Horizontal visibility
Vertical visibility
Weather
Clouds
Temperature
Dew point
Pressure
Why is volcanic ash dangerous for aircraft?
The sand particles get converted into glass due to the high temperature in the engines, causing damage and jamming of the engines
What are the three cells in the troposphere called (from equator to the north pole)?
Hadley Cell
Ferrel Cell
Polar Cell
True/false: Temperature always decreases with an increase in altitude
False, temperature can also stay constant or increase with an increase in altitude
What are the 3 ways of transferring energy?
Radiation: transfer of energy between bodies that are not in contact
Conduction: transfer of energy between bodies in contact (without movement)
Convection: transfer of energy by vertical movement
The process through which clouds are formed is called…
Condensation
True/false: warm air can hold more water than cold air
True.
What % of accidents are weather related?
About 28%
- In the northern hemisphere, high pressure areas always rotate …
- In the northern hemisphere, low pressure areas always rotate …
- Clockwise (to the right)
- Counterclockwise (to the left)
How many hPa difference is there between two isobars?
4 hPa