Cold frontal troughs sometimes stretch across the subtropical highs in the southern hemisphere to connect to the ITCZ. In this case, the band of clouds associated with a cold front continues north-westward towards low latitudes, to form a north-west cloud band. These mainly upper-level clouds are due to uplift into divergence in the subtropical jet (Note 12.L). They are usually found either (a) in the south-west Pacific at the SPCZ (Section 12.1), (b) across south-east Brazil, (c) across Madagascar, or (d) across Australia (as in Figure 13.5). They may bring rain in the desert.
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