Forecast
Usually, nimbostratus is a sign of steady moderate to heavy precipitation, as opposed to the shorter period of typically heavier precipitation released by a cumulonimbus cloud. However, precipitation does not occur at ground level in case of virga and accompanies other cloud types. Precipitation may last for several days, depending on the speed of the occluded front it accompanies. A nimbostratus virga cloud is the same as a normal nimbostratus, but the precipitation is virga and it never reaches the ground. Stratus or stratocumulus (comprising the warm sector of a frontal system) usually forms when it clears.
Read more about this topic: Nimbostratus Cloud
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