Hail Can Fall From Both Cumulonimbus and Nimbostratus Clouds.
Nimbostratus
Nimbostratus (Ns) - the name derives from the Latin nimbus = rain, and stratus = spread out. Nimbostratus is a member of the ten key cloud types (or cloud genera). Although it is classed as a center-level layer cloud, its base is generally low at 0 to two km (0 to half-dozen,500 ft), oft very close or even touching the ground. Nimbostratus are as well classified as clouds of farthermost vertical evolution.
Nimbostratus are very mutual clouds in temperate latitudes, forming a dense and extremely all-encompassing gray layer at low altitude. They are thick, nighttime, amorphous and solid in appearance, oft associated with more or less continuous rainfall which makes the deject base soft and lengthened. Frequently they accept ragged edges and small cloud fragments, called scud, developing beneath the main nimbus cloud from recondensation of water saturated air. The Sun is always obscured. Nimbostratus clouds produce tiresome and gloomy moisture days. Atmospheric precipitation of snow or rain is prolonged and widespread, although not unremarkably heavy and individual minor areas may not be producing atmospheric precipitation at whatever i moment.
On mountainsides, nimbus clouds ofttimes can be seen ascending or descending the slopes as a rainstorm arrives or departs.
Nimbostratus clouds might consist entirely of cloud droplets or raindrops, or of water ice crystals and snowflakes. All the same, the limerick of nimbus clouds varies profoundly depending on temperature and often they may be mixed with supercooled water aerosol and water ice crystals nowadays at the same layer.
All-encompassing layers of nimbus clouds arise through the slow uplift of moist air in a depression, typically at the advancing warm front end. Thickening layers of altostratus (As) are frequently preceeding the nimbus cloud equally the cloud base lowers towards the surface. Nimbostratus is distinguished from altostratus (Every bit) past its thickness and from altocumulus (Ac) and stratocumulus (Sc) by the fact that they have regular patterns and a well defined cloud base. If the deject is accompanied by thunder, lightning or hail, and then it is d efined every bit being cumulonimbus.
Varieties of Nimbostratus:
Ns praecipitatio, when precipitation is reaching ground, virga with fall-streaks and pannus, as ragged scud clouds developing between ground surface and cloud base of operations. Nevertheless, nimbostratus is not subdivided into species, nor does information technology take very much 'true' varieties. Because of its density, no optical phenomena volition appera underneath it. Its just a gray nighttime blanket.
What do nimbostratus tell about the conditions?
Well, firstly nimbostratus are bringing often days of persistent rain or snow. Autumn-streaks hanging from the deject base of operations are heralding imminent rain or snow. Breaking upward nimbostratus indicates the passage of a cold front end.
Source: https://www.weatheronline.co.uk/reports/wxfacts/Nimbostratus.htm
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