| 1. Weather forecast
| ─ Weather prediction; future weather.
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| 2. Meteorologist
| ─ The person qualified to predict a forecast of the weather.
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| 3. Current weather conditions
| ─ The present weather conditions.
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| 4. Synoptic chart
| ─ Weather map showing the present weather conditions.
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| 5. Area of low pressure (low pressure area)
| ─ An area as shown on the weather map when the pressure decreases towards the centre.
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| 6. Area of high pressure (high pressure area)
| ─ An area as shown on the weather map when the pressure increases towards the centre.
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| 7. Precipitation
| ─ Rain, snow, hall or any water that falls to the ground in liquid or solid form.
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| 8. Front
| ─ An imaginary line on the ground which marks the division of the two air masses.
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| 9. Headwind
| ─ The wind in the opposite direction to the travel of the aircraft.
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| 10. Tailwind
| ─ The wind in the same direction to the travel of the aircraft.
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| 11. Ground speed
| ─ The speed of an aircraft measured on the ground. This speed is affected by a headwind which would reduce it, or by a tailwind which would increase the ground speed.
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| 12. Cold front
| ─ A cold front is formed when a moving cold air mass meets a stationary warm air mass.
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| 13. Warm front
| ─ A warm front is formed when a moving warm air mass meets a stationary cold air mass.
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| 14. Ceiling
| ─ The base of the clouds which cover more than 50% of the sky.
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| 15. Overcast
| ─ The sky conditions when 90% or more is covered by clouds.
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