![]() The warm front occlusion is associated with thunderstorms, rain, and fog. When this happens, the cold front air moves over the warm air, trapping the warmer air below. A warm front occlusion occurs when the air ahead of the warm front is cooler than the cold front. When this happens, the warm air is forced aloft creating a mixture of both warm front and cold front weather. A cold front occlusion occurs when the cold front is cooler than the air ahead of the warm front. The Terminal Doppler Weather Radar (TDWR) network is a Doppler weather radar system operated by the Federal Aviation Administration (FAA). The temperatures of the two fronts determine which type of occluded front is created. When a fast-moving cold front catches up with a slow-moving warm front, an occluded front is created. A stationary front is formed, which can cause mixed weather for days. When a warm front and a cold front meet with equal force, neither can push the other one out of the way. This valley of low pressure may bring clouds, showers, and wind shifts, especially after the trough has passed. It is similar to a valley that is surrounded by mountains. Visibility will recover after the warm front has passed.Ī trough is an elongated area of low pressure. After the warm front has passed, stratocumulus clouds will form that may produce showers. While the warm front is passing, visibility may become poor. Barometric pressure readings will level off. The temperature increases steadily while the dew point remains uniform. Catto and Pfahul (2013) observed similar kind of precipitation extreme associated with frontal systems. Frontal slope is significant because it represents the POTENTIAL lift in a frontal zone. These clouds may cause thunderstorms and rain showers, depending upon the strength of the cold front.Ī warm front occurs when a mass of warm air approaches and displaces the cooler air. These precipitating bands embedded in large-scale monsoon system seem to be playing a key role in producing the extreme rainfall observed on 15th August 2018. Frontal slope is the ratio of the height of the upper front at some location (RISE) to the distance between that location and the surface front (RUN). The rising of the warmer air may create cumulus and cumulonimbus clouds. The warm air is forced up to higher elevations. A sequence of Doppler radar observations obtained during the PADRE project is used to identify a region of dry-air intrusion in a frontal system approaching the Alps. In the norther hemisphere, airflow will circulate counter-clockwise around an area of low pressure.Ī cold front occurs when a mass of cold air approaches and displaces the warmer air. Clouds, precipitation, and high winds are generally associated with lower pressures. In the northern hemisphere, airflow will circulate clockwise around an area of high pressure.Ī "Low" is an area of lower pressure surrounded by areas of higher pressure. ![]() ![]() Clear skies and dry weather are generally associated with higher pressures. A "High" is an area of high pressure surrounded by areas of lower pressure. ![]()
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