December is the cruelest month in the Culebra Range of southern Colorado. This chain of lofty mountains is rugged terrain, where the raging winds of winter have caught several airplanes in downdrafts. in my Navion, I have sniffed out the range’s updrafts and downflows, trying to identify weather conditions leading to airplane disasters and to relate winds to mountain contours. On foot, I have spent many days climbing Culebra Range peaks. These mountains are my backyard.
Deadly Downdrafts: Understanding the Risks
Key Takeaways:
- The Culebra/Sangre de Cristo Mountains in Colorado are extremely dangerous for aircraft due to powerful mountain wave downdrafts, especially in winter, which have caused multiple crashes.
- Accidents highlight that even experienced, instrument-rated pilots often underestimate these lethal conditions, neglecting thorough weather briefings (including SIGMETs, AIRMETs, and PIREPs) and terrain awareness.
- Pilots flying in mountainous terrain must recognize signs of downdrafts (e.g., reduced groundspeed, rapid altitude loss) and should entirely avoid the Central Rockies when mountain waves and turbulence are forecast.
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