FLIGHT HAZARDS OF MOUNTAIN WAVES AND WIND EVENTS. Stan Rose National Weather Service, Pueblo, Colorado. Roughly one-half of the air accidents in vicinity of the Rocky Mountains are Weather Related. Mountain Turbulence: Convection. Stan Rose 2008. Convection: Thermally Generated flows.
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Stan Rose National Weather Service, Pueblo, Colorado
Stan Rose 2008
Only moderate cross-barrier flow needed.
Unstable air : if unstable air crosses a mountain barrier, turbulence is almost certain.
Cumulus clouds are good indicators.
Leeside downdrafts can be strong, but generally don’t extend far beyond the range.
Strong cross-barrier flow needed.
Cloud rows and lenticular clouds are indicators.
Rotor clouds can form in the lee, downstream, below ridge-top.
Turbulence can be found well downstream.
Stan Rose 2008
Most common in Winter Months.
Can occur night or day: Often night
Downdrafts of 50+ fps
Winds at mountain top generally > 30 Kts.
Jet stream in the vicinity.
Frontal passage can precede SDW.
NAM 12km 27h forecast; 10/10/2008 18Z valid 21Z 10/11/2008
Sea Level Pressure or 850mb Charts