H6 Clouds: Cirrostratus (Cs) increasing and above 45° elevation
Cirrostratus progressively invading the sky and generally becoming denser, the continuous veil extends more than 45° above the horizon without the sky being totally covered.
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Notes: If the cirrostratus of H5 continues to invade the sky so that its continuous part extends more than 45 degrees above the horizon, without covering the whole sky, the coding becomes H6. The cirrostratus generally grows denser as a whole as it progresses.
