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Jet Streams

ATPL 050 - High Altitude Winds

Jet Stream
Aircraft Position
Latitude50°N
Flight Level360
Heading270°
Ground Speed Effect
-100 kt
Component
Headwind
Meridional Cross Section
FL250FL300FL350FL400FL45020°N30°N40°N50°N60°N70°NTropopause100kt
Jet Core
Clear Air Turbulence Risk
High
Position
Near Jet
Polar Jet

Located at 45-65°N, FL300-400. Core speeds up to 200+ kt. Strongest in winter. Associated with frontal systems.

Subtropical Jet

Located at 25-35°N, FL350-450. Weaker than polar jet. More stable but higher altitude. Year-round phenomenon.