When comparing horizontal extent versus vertical energy, what does a massive, dark sheet stretching horizon-to-horizon suggest?

Answer

The rain is highly likely to be widespread and relatively steady

A massive sheet lacking towering tops, typical of nimbostratus, indicates a large, expansive system where the precipitation is likely already falling nearby or will cover a broad region steadily.

When comparing horizontal extent versus vertical energy, what does a massive, dark sheet stretching horizon-to-horizon suggest?

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Why Storm Clouds Are Dark - YouTube

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