FAA Private Pilot Airplane (PAR)Weather Theory and ServicesMedium
A pilot is planning a flight across a region that is experiencing a strong temperature gradient and significant wind shear, particularly at higher altitudes. This scenario is most indicative of the presence of a:
- AStationary front with an occluded segment.
- BCold front moving rapidly through the area.
- CJet stream, typically found at high altitudes.
- DRidge of high pressure, causing subsidence.
Show answer & explanationAnswer & explanation
Correct answer: C. Jet stream, typically found at high altitudes.
A jet stream is a narrow, fast-moving band of air in the upper troposphere, characterized by strong wind shear and significant temperature gradients across its boundaries, making it a source of turbulence.
Why the other options are wrong
- A. Stationary or occluded fronts involve temperature gradients and some wind shear, but the description of 'higher altitudes' and 'strong wind shear' points more specifically to a jet stream.
- B. Cold fronts cause temperature gradients and wind shear, but primarily at lower altitudes and are not typically associated with 'high altitudes' as their main feature.
- D. A ridge of high pressure is associated with stable air, subsidence, and generally clear, calm weather, not strong wind shear or temperature gradients.
Jet Stream Characteristics
Jet streams are narrow bands of strong winds in the upper troposphere, characterized by significant temperature gradients and wind shear.
- Located at high altitudes (tropopause level).
- Associated with strong horizontal temperature gradients.
- Causes significant wind shear, leading to clear air turbulence (CAT).
Memory trick: Jet stream is a 'High-Speed Highway' with 'Turbulent Shoulders'.