| As you pointed out, it takes about 800 million volts to get lightning to jump between a thundercloud and the ground. |
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| The top of a cumulonimbus cloud is often capped by cirrus, which is why the anvil of a thundercloud is often brilliant white. |
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| A thundercloud, with a distinctive upper anvil shape, results from air which is moist and unstable rising by convection. |
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| A company in the USA have now produced a gel that they claim is able to almost totally destroy a building thundercloud. |
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| Oh, yeah, we were still in a thick thundercloud with periodic flashes of lightning surrounding us. |
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| For a moment, the gray plane recalled a thundercloud against the clear blue sky. |
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| This enables the creation of an upward leader from the terminal that propagates towards the downward leader coming from the thundercloud. |
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| When the thundercloud reaches the cumulonimbus stage and hits the tropopause, the jet stream tugs the cloud into a recognizable anvil shape. |
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| The top of the thundercloud has flattened out at the tropopause, the boundary between the two layers. |
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| A funnel cloud at the rear base of a thundercloud, often behind a curtain of heavy rain or hail. |
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| Siminov came in, his face like a thundercloud. |
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| Red sprites and blue jets, flashes of light that occur above thunderstorms and that are associated with normal lightning in the thundercloud below. |
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