Another funnel cloud likely in Auckland - experts (+ photos)

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Weather forecasters say another funnel cloud is possible over Auckland today.

Yesterday a dramatic funnel cloud drifted over the southern part of Auckland, scaring many people who thought it was a tornado.

Weatherwatch.co.nz said another funnel cloud could happen today over Auckland as large convergence clouds built - today's cloud was likely to be between central Auckland and the Waitakere Ranges to the west.

Spokesman Philip Duncan said yesterday's funnel cloud was caused by a mixture of cooler air and warmer air moving in different directions at different altitudes causing the clouds to rotate and produce a funnel cloud.

A funnel cloud was not a tornado, he said.

A tornado formed when a funnel cloud connected with the ground but not all funnel clouds became tornados.

- NZPA