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When these high clouds progressively invade the sky and the barometric pressure begins to fall, precipitation associated with the disturbance is likely about 6 to 12 hours away. A thickening and lowering of cirrocumulus into middle-étage altostratus or altocumulus is a good sign that the warm front or low front has moved closer and it may ...
A thickening and lowering of these high clouds into middle-stage altostratus or altocumulus is a good sign the warm front or low has moved closer and precipitation may begin within less than six hours. Once the clouds have thickened to 2,500 metres (8,200 ft) from the earth’s surface, precipitation can begin to fall from heavy nimbostratus ...
Weather in New York is heavily influenced by two air masses: a warm, humid one from the southwest and a cold, dry one from the northwest. [3] A cool, humid northeast airflow from the North Atlantic is much less common, and results in a persistent cloud deck with associated precipitation which linger across the region for prolonged periods of ...
The presence of altocumulus undulatus may indicate precipitation within the next 20 hours or simply an overcast day. [ 1 ] As with other altocumulus , the undulatus variety can form in all seasons, announcing an approaching system within the general area (about 100 - 200 mi or 160 – 322 km).
Altocumulus (from Latin altus 'high' and cumulus 'heaped') [1] is a middle-altitude cloud genus that belongs mainly to the stratocumuliform physical category, characterized by globular masses or rolls in layers or patches – the individual elements being larger and darker than those of cirrocumulus and smaller than those of stratocumulus. [2]
New York City can occasionally experience strong winds, like many coastal locations. Tropical cyclones or intense oceanic storms bring the strongest winds. The strongest gust in Central Park, of 78 miles per hour (126 km/h), occurred on December 2, 1974, however, a station at The Battery reported a gust of 113 miles per hour (182 km/h) on ...
In the middle level are the alto- clouds, which consist of the limited-convective stratocumuliform cloud altocumulus and the stratiform cloud altostratus. Mid-level clouds form from 2,000 metres (6,600 ft) to 7,000 metres (23,000 ft) in polar areas, 7,000 metres (23,000 ft) in temperate areas, and 7,600 metres (24,900 ft) in tropical areas.
Mid-level stratocumuliform clouds of the genus altocumulus are not always associated with a weather front but can still bring precipitation, usually in the form of virga which does not reach the ground. Layered forms of altocumulus are generally an indicator of limited convective instability, and are therefore mainly stratocumuliform in structure.