The FIRST sign of an approaching warm front is the appearance of nimbostratus clouds.

Name: The FIRST sign of an approaching warm front is the appearance of nimbostratus clouds.
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The first sign of an approaching warm front is typically the appearance of high, thin cirrus clouds. These clouds thicken and lower into cirrostratus and altostratus clouds as the front approaches, well before nimbostratus clouds and precipitation develop.

The FIRST Sign of an Approaching Warm Front Is the Appearance