This document is a summary of the ATPL subject Meteorology. You can use it as an easy way to get started, a refresher for your theory or a quick way to check if you know the essential parts of the subjects short before your exam. I made the summary while i was studying for my ATPL theory, i passed...
Section 4 – Meteorological information
Observation ............................................................................ 20
Weather charts ........................................................................ 22
Information for flight planning… .............................................. 24
Meteorological services… ......................................................... 25
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, Meteorology
The Atmosphere
Standard atmosphere:
-15℃
-1013,25 hPa or 29,92 in hg
-1.225 kg/m3
-ELR = 1,98 ℃ per 1000 ft
-DALR = 3 ℃ per 1000 ft
-DLR = 0,5 ℃ per 1000 ft
-Tropopause = 36090 ft / 11 km
-> Temperature = -56,5 ℃
Lapse Rate:
-MSL = 30 ft
-18000 ft/500 hPa = 50 ft
-39000 ft/200 hPa = 100 ft
Diurnal variation
-Max temperature = 2 hours after local noon
-Max insolation = at Local noon
-Min temperature = half an hour rafter sunrise
Pressure Convert factor
-18000 ft = 50% of pressure = 500 hPa -Celsius -> Kelvin = +273
-34000 ft = 25% of pressure = 250 hPa -Meter -> Feet = x 3,28
-troposphere = 90% of water vapour -1 NM -> 1,852 km
ISO lines Height per hPa lapse rate
-Isotach = wind speeds -H = 96 x T : P
-Isobar = pressure -T = kelvin, P = hPa, H = ft/hPa
-Isohyps = height
-Isotherm = temperature
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