aviationweather.co.za

01

Why aviation weather is different

General weather forecasts aimed at the public describe conditions in broad terms: sunny, cloudy, chance of rain. Aviation weather is far more precise. Pilots need to know exact wind direction and speed, visibility in metres or kilometres, cloud base height, temperature and dew point, and the presence of hazards such as thunderstorms, turbulence or icing. Because aircraft operate in three dimensions and at speed, small changes in weather can have a large effect on safety and performance.

To meet this need, aviation uses a standardised set of weather products and a shared international language. Reports such as METAR and forecasts such as TAF follow strict formats so that a pilot flying anywhere in the world can read and understand them, regardless of the local language spoken on the ground.

02

Who produces aviation weather information

In most countries, aviation weather observations and forecasts are produced by a national meteorological service working closely with the civil aviation authority and air traffic control. In South Africa, this role involves cooperation between organisations responsible for meteorology, air navigation services and civil aviation regulation. Weather stations at and near airports record conditions at regular intervals, and forecasters issue predictions for specific aerodromes and flight routes.

This information then flows into pre flight briefings, in flight updates and air traffic control communications. Pilots are trained to interpret these reports as part of their licensing, and regulations typically require that weather be checked and considered before every flight.

03

The main types of aviation weather information

There are several categories of aviation weather product that a pilot will typically encounter:

• Surface observations, which describe actual conditions at an aerodrome at a given time.
• Terminal forecasts, which predict expected conditions at an aerodrome over a defined period, usually covering wind, visibility, cloud and significant weather.
• Area and route forecasts, which cover larger regions and are used for planning cross country flights.
• Significant weather charts, which show the location and expected movement of hazards such as thunderstorms, turbulence and icing at various altitudes.
• Warnings and alerts, issued when conditions are expected to be hazardous, such as severe turbulence, low level wind shear or volcanic ash.

Each of these products answers a different question. Surface observations tell you what is happening right now. Forecasts tell you what is expected. Charts and warnings help you understand the bigger picture and plan around hazards rather than flying into them.

04

Reading the reports

At first glance, aviation weather reports can look like a dense string of letters and numbers. A METAR report, for example, packs wind, visibility, weather phenomena, cloud layers, temperature, dew point and pressure into a single compact line. Learning to decode this format is a core part of pilot training, and once understood, it allows a very fast and precise assessment of conditions. This site includes a dedicated page explaining METAR and TAF reports in detail, breaking down each element so that the format becomes easier to recognise and use with confidence.

05

Weather hazards relevant to flying

Certain weather phenomena are of particular concern in aviation because of how they affect aircraft performance and control. Thunderstorms bring turbulence, lightning, hail and sudden wind changes. Low cloud and poor visibility can make visual flight difficult or impossible. Strong or gusty winds affect takeoff and landing, especially crosswinds. Icing can build up on wings and other surfaces, changing how an aircraft handles. Wind shear, a sudden change in wind speed or direction over a short distance, is especially dangerous close to the ground. A separate page on this site looks at these hazards in more depth, explaining how they form and why they matter for flight planning.

06

Using weather information responsibly

No single report tells the whole story. Experienced pilots build a picture of the weather by combining several sources: current observations, forecasts, charts and, where available, pilot reports from other aircraft already in the air. They also build in margins for uncertainty, since forecasts can change and conditions can develop faster than predicted. Treating weather information as one part of a broader decision making process, rather than a single go or no go answer, is a key principle taught throughout pilot training.

07

About this site

This is an independent information resource. It does not provide live weather data, official briefings or operational forecasts, and it should never be used as a substitute for official aviation weather services or for the mandatory pre flight briefing required by aviation regulations. Its purpose is purely educational: to help readers understand how aviation weather works, what the reports mean, and why weather plays such a central role in safe flying.