The tail of ex-tropical Cyclone Tam will deal out one last lash across the country today

A severe thunderstorm watch has been issued from Hawke's Bay through to Bay of Plenty.

Yesterday, a landslide in the Brynderwyn Hills badly damaged cars and blocked part of State Highway 1, as Auckland and Northland were slammed with heavy rain.

Some Northland communities are still without power days after the storm arrived.