Weather Forecasting: "Air Masses and Fronts: Warm Front" 1962 USAF Meteorology

more at scitech.quickfound.net "DISCUSSES HAZARDS OF THE WARM FRONT AND SHOWS HOW IT FORMS. COVERS NIMBO STRATUS AND STRATUS CLOUD DECKS, SUMMER AND WINTER PATTERNS, AREAS OF INSTABILITY AND STRUCTURAL ICE." US Air Force training film TF1-5388D Public domain film from the National Archives, slightly cropped to remove uneven edges, with the aspect ratio corrected, and mild video noise reduction applied. The soundtrack was also processed with volume normalization, noise reduction, clipping reduction, and equalization. en.wikipedia.org A warm front is a density discontinuity located at the leading edge of a homogeneous warm air mass, and is typically located on the equator-facing edge of an isotherm gradient. Warm fronts lie within broader troughs of low pressure than cold fronts, and move more slowly than the cold fronts which usually follow because cold air is denser and less easier to remove from the Earth's surface. This also forces temperature differences across warm fronts to be broader in scale. Approach of a warm front as seen from the ground. They are not usually as well defined as this. Clouds ahead of the warm front are mostly stratiform, and rainfall gradually increases as the front approaches. Fog can also occur preceding a warm frontal passage. Clearing and warming is usually rapid after frontal passage. If the warm air mass is unstable, thunderstorms may be embedded among the stratiform clouds ahead of the front, and after frontal passage thundershowers may ...
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