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“A demented and seductive vortical tension was building in the community. The jitters were setting in,” she writes.

The tallest peak in Indonesia, Tambora exploded in April 1815, consuming whole villages in “a vortical hell of flames, ash, boiling magma and hurricane-strength winds.”

But if the current of their conversation had been vortical and crowded, the outcome was perfectly clear.

This return will then take the form of violent storms of wind, usually of a cyclonic nature, and affording direct evidence of the tendency of the air masses to pursue vortical paths in their movement towards lower levels.

On the contrary, they may and do move both towards the poles and downwards by circuitous and even vortical paths.