How the Wind Blows

The root cause of wind is the unequal heating of the earth. We usually take it for granted that tropical areas are hot while polar areas are cold. But whether youre in Greenland or Venezuela, the sunlight is the same. Its the angle at which the suns rays hit the ground that makes the difference. Near the equator, the summer sun is at very high angles. But, in Greenland the summer sun never gets higher than about 30-40 degrees above the horizon, spreading the energy over a larger area, reducing heating of the ground and air.

Key Takeaways:

• Wind is fundamentally caused by the Earth's unequal heating, driving global atmospheric circulation patterns (Hadley, Polar, Ferrel cells) that establish prevailing winds, which are then influenced by synoptic, mesoscale, and microscale weather systems.
• While large-scale wind patterns are reasonably predictable, forecasting accuracy decreases significantly for mesoscale (e.g., mountain winds, sea breezes) and microscale phenomena (e.g., microbursts, dust devils, turbulence), requiring pilots to rely on their knowledge and observation.
• Microscale winds present the greatest aviation hazards, demanding pilot vigilance; safety tips include adjusting approach speeds for gusts, adhering to aircraft crosswind limits, and understanding how wind direction typically shifts with altitude for flight planning.

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