Ah de polaire én de subtropische straalstroom 
Bericht van: Saskia (Diepenveen)
- moderator -
, 26-05-2011 22:13
A second jet stream is located at the poleward limit of the equatorial tropical air above the transition zone between tropical and mid-latitude air. This subtropical jet stream is usually found at latitudes 30 to 40in general westerly flow. This jet may not be marked by pronounced surface temperature contrasts but rather by relatively strong temperature gradients in the mid-troposphere. Moreover, when the polar-front jet penetrates to subtropical latitudes, it may merge with the subtropical jet to form a single band. The subtropical jet, which is generally weaker and located at higher elevations than its higher-latitude cousin, is less commonly associated with migrating cyclones; instead, it may be accompanied by sporadic periods of strong convection, along with heavy rain showers.
Also peculiar to the tropical latitudes of the Northern Hemisphere is a high-level jet called the tropical easterly jet stream. Such jets are located about 15 N over continental regions due to the latitudinal heating contrasts over tropical landmasses that are not found over the tropical oceans.
Bron: http://abyss.uoregon.edu/~js/glossary/jet_streams.html
