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Reference.org
Subtropical front
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<p>A subtropical front is a surface water mass boundary or front, which is a narrow zone of transition between air masses of contrasting density, air masses of different temperatures or different water vapour concentrates. It is also characterized by an unforeseen change in wind direction, and speed across its surface between water systems, which are based on <a href="/facts/Temperature/QyGe4gmj">temperature</a> and <a href="/facts/Salinity/X6mB1YAM">salinity</a>. The subtropical separates the more saline subtropical waters from the fresher sub-Antarctic waters. </p>