However good the source term, though, such models get further from reality as time goes on. Some cloud modellers are considering using the fact that ash, unlike fallout, can be seen from afar to make better calculations. Observations from ground, air and satellite of the ash's extent at specific times might be used to create a series of model runs that would track it better. Yet satellite coverage doesn't always allow for good snapshots; nor does the weather, which can put clouds in the way.
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