Meteorology
The full EASA ATPL(A) Meteorology syllabus, taught properly: the atmosphere and altimetry, wind from the geostrophic balance to the jet streams, thermodynamics and stability, clouds, fog and precipitation, air masses, fronts and pressure systems, climatology from the ITCZ to the named winds, the flight hazards from icing to thunderstorms, and the observations, charts and messages that carry the weather to the flight deck — every learning objective explained.
The ocean of air the whole subject lives in: its layers up to FL 650, how heat moves through it and why it cools with height, the pressure and density ladder of the International Standard Atmosphere, and altimetry — what an altimeter really measures and how to correct it.
Meteorology begins with the medium itself. Before fronts, thunderstorms or a single weather report, this module builds the atmosphere from the ground up: its layered structure, the temperature that shapes those layers, the movements of heat that set that temperature (and overturn it in the inversion), the pressure and density that thin with every foot climbed, and the standard atmosphere that turns all of it into numbers an altimeter can use.
Why air moves: the pressure gradient that starts every wind, the Coriolis force that bends it, the friction layer that slows and turns it near the ground, and the winds those forces build, from the global circulation and the local breezes of coasts and valleys to mountain waves, turbulence and the jet streams.
Pressure differences are the engine and wind is the motion. This module follows the chain from cause to consequence: first the forces (gradient, Coriolis, friction) and the balanced winds they produce, then the circulations they drive at every scale, and finally the rough edges a pilot actually feels: turbulence, mountain waves and the jet streams.
The physics of water in the air: humidity and the dew point, the six changes of state and the latent heat they move, and the adiabatic cooling of rising air — the lapse rates and stability rules that decide whether the atmosphere builds a cloud, a thunderstorm, or nothing at all.
The first lesson of the course promised that the atmosphere's variable few per cent of water vapour is what the rest of the subject is about. This module makes good on it: how much vapour air can hold, what happens when it can hold no more, the heat that every change of state moves in or out of the air, and the adiabatic bookkeeping of rising parcels that turns those changes into cloud and weather.
Water made visible: how rising, stirring and cooling air builds the ten cloud genera, how the same cooling at ground level becomes fog and mist while suspended dry particles make haze, and how cloud droplets grow into rain, snow and hail, with the icing and turbulence each cloud type carries for the aircraft that enters it.
The thermodynamics module ended with air cooling as it rises and condensing when it can hold no more. This module is about what that condensation looks like from a cockpit: the cloud types and the heights they keep, the fogs that form when the cooling happens at the surface instead of aloft, and the precipitation that falls when cloud droplets grow too heavy to stay up. Three lessons: clouds, then fog, mist and haze, then precipitation.
The weather machine of the mid-latitudes: the great air masses, each stamped with the temperature and moisture of its birthplace, the letter codes that name them on a chart, and the fronts (warm, cold and occluded) that form where they collide, carrying most of Europe's cloud, rain and flying weather with them.
So far the course has treated air locally: a parcel rising here, a fog forming there. This module changes scale. Air spends days parked over ice caps, oceans and deserts, takes on their character, and then travels — and when two of these travelling bodies meet, they do not mix but push against each other along sloping battle lines. Three lessons: the air masses themselves, the warm and cold fronts where they meet, and the occlusion that ends each frontal system's life.
The cast of the pressure chart beyond the frontal depression: the planet's permanent and seasonal highs and lows, the anticyclones (warm, cold, blocking) with their subsiding, haze-trapping calm, the ridges and troughs between systems, the family of non-frontal lows, and the tropical revolving storm, the most violent weather system an aircraft must never meet.
The previous module followed one weather system, the frontal depression, through its whole life. This module widens the lens to everything else on the pressure chart: where the world's great highs and lows sit in January and July and why; how anticyclones work and why their fine weather has a dirty secret; the lows that form without any front at all; and, in the second lesson, the tropical revolving storm, which obeys none of the mid-latitude rules and demands a chapter of its own.
Weather averaged into character: the five great climate zones and the transitional belts between them, the daily engine of tropical convection and the ITCZ where the trade winds collide, the monsoons that reverse whole circulations by season, the typical mid-latitude chart situations from the westerly parade to the hidden cold-air drop, and the named winds (Foehn, Mistral, Bora, Harmattan) that give individual regions their signature flying weather.
So far the course has asked what the atmosphere is doing today. Climatology asks what it usually does: the question behind every seasonal route plan, every alternate strategy and every 'is this normal for March?' Three lessons: the climate zones of the world and the tropical convection machine centred on the ITCZ; the trade winds and monsoons with their sandstorms and cold-air outbreaks; and the typical mid-latitude situations with the local winds famous enough to have names.
The module where the meteorology bites: the icing that builds on wings and in carburettors and the conditions that feed it, the ice types and their dangers up to modern ice crystal icing, turbulence and wind shear in practice, thunderstorms with their lightning, downbursts and tornadoes and how to stay out of them, the quieter traps of inversions, the stratosphere and mountainous terrain, and the phenomena that take visibility away.
Seven modules built the machine: heat, wind, water, clouds, fronts, pressure systems, climates. This module is about what the machine does to an aircraft. Eight lessons, and every one is a hazard chapter: three on icing (where it forms, what kind forms, and what it does), then turbulence and wind shear, thunderstorms and lightning, downbursts and tornadoes, the assorted hazards of inversions, the stratosphere and mountains, and finally the ways the atmosphere hides the ground from you.
The reporting machine behind every briefing: how wind, visibility, cloud and weather are actually observed and measured, what radiosondes, satellites, weather radar and aircraft reports each contribute, how significant weather, surface and upper-air charts are read, how METARs, TAFs, SIGMETs and the other messages decode, and the world forecast system that produces it all.
Eight modules built the weather; the last one builds the paperwork — and a pilot lives on the paperwork. Five lessons: how wind and visibility are measured at the surface; how the weather, the clouds and the upper air are observed; what the satellites, the weather radar and other aircraft add; the charts; and the coded messages, the briefing and the offices and organisations that produce it all.