Chinook Winds

In 1892, E.B. Garriott wrote for the fledgling U.S. Weather Bureau, Following a period of intense cold the Chinook wind is a welcome visitor in the Northwest. The icy clutch of winter is loosened. The earth throws off its winding sheet of snow. Humanity ventures forth to inhale the balmy, spring-like air. Animate nature rejoices.

Key Takeaways:

• Chinook winds are powerful, warm, downslope foehn winds occurring in the Rocky Mountains, characterized by rapid temperature increases and most common between November and March.
• These winds result from specific pressure gradients along mountain ranges and complex atmospheric flow dynamics involving supercritical and subcritical airflows.
• Chinooks present significant aviation hazards due to severe turbulence, wind shear, hydraulic jumps, and dangerous rotor circulations, particularly downwind of mountain ranges.
• Forecasting chinook effects is challenging, as surface charts are often deceptive and numerical models struggle to resolve their localized intensity and fine-scale phenomena, requiring pilots to have a conceptual understanding and review diverse data sources.

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