Midwestern farmers used to say "mare's tail and mackerel scales bring the storm down on you head"; mare's tails are cirrus clouds and mackerel scales are cirrostratus. when this sequence is followed by altostratus the old farmers were talking about an approaching front.

When this sequence is followed by altostratus the old farmers were talking about an approaching warm front. In addition, a warm front is well-defined as the changeover area where a warm air mass is substituting a cold air mass. The warm fronts usually move from southwest to northeast and the air in arrears a warm front is warmer and moister than the air ahead of it. When a warm front permits over the air turn out to be markedly warmer and more humid than it was earlier.

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