H5 Clouds: Cirrostratus (Cs) increasing H5 Clouds Symbol = – but below 45° elevation. Increasing Cirrostratus Clouds Below a 45 Degree Elevation Above the Horizon Cirrostratus can indicate precipitation. H5 While H5 cirrostratus invade the sky, the majority of the clouds are no greater than Cirrostratus progressively invading the sky 45 degrees above the horizon. and generally becoming denser, but the continuous veil does not reach 45° above the horizon. National Weather Service Shapeless, thick, and dense are ways to discuss cirrostratus clouds. Sometimes Notes: The next four classifications (H5-H8) these clouds are thick enough to cover are of the same cloud type. The only the sun or moon. But at other times difference is the amount of the celestial these clouds are so thin that they are dome that is covered by the cloud, whether only visible because they change the sky the cloud is increasing or decreasing across color. These clouds do invade the sky, the sky, and must be the predominate but not at an angle greater than 45 cloud. The reason is cirrostratus a degrees above the horizon. The good precursor of precipitation and if it is presence of cirrostratus in the sky often increasing then precipitation may occur indicates precipitation will be on its way within 12 to 24 hours. For the H5 to an area within 12 to 24 hours. The classification, the main characteristic is edge of this band of invading clouds is cirrostratus invading the sky progressively usually irregularly shaped, but may also but with its continuous part still less than 45° have more of a straightened edge as above the horizon. Cirrostratus not well. completely covering the sky may be Source:
H5 Clouds: Cirrostratus (Cs) increasing but below 45° elevation. H5 Cirrostratus progressively invading the sky and generally becoming denser, but the continuous veil does not reach 45° above the horizon. Notes: The next four classifications (H5-H8) are of the same cloud type. The only difference is the amount of the celestial dome that is covered by the cloud, whether the cloud is increasing or decreasing across the sky, and must be the predominate cloud. The reason is cirrostratus a good precursor of precipitation and if it is increasing then precipitation may occur within 12 to 24 hours. For the H5 classification, the main characteristic is cirrostratus invading the sky progressively but with its continuous part still less than 45° above the horizon. Cirrostratus not completely covering the sky may be H5 Clouds – Symbol = Increasing Cirrostratus Clouds Below a 45 Degree Elevation Above the Horizon Cirrostratus can indicate precipitation. While H5 cirrostratus invade the sky, the majority of the clouds are no greater than 45 degrees above the horizon. National Weather Service Shapeless, thick, and dense are ways to discuss cirrostratus clouds. Sometimes these clouds are thick enough to cover the sun or moon. But at other times these clouds are so thin that they are only visible because they change the sky color. These clouds do invade the sky, but not at an angle greater than 45 degrees above the horizon. The presence of cirrostratus in the sky often indicates precipitation will be on its way to an area within 12 to 24 hours. The edge of this band of invading clouds is usually irregularly shaped, but may also have more of a straightened edge as well. Source:
APPENDICES-2.docx