Kahii, Kent Street's elegantly understated kissaten, has unveiled a new after-dark menu of tea- and coffee-based cocktails.

SES has confirmed emergency crews have been preparing as far south as Sydney as heavy rain impacts NSW's Mid North Coast.

The maps show the areas of immediate danger, current and predicted flooding, and where residents should be ready for storms.

Transport authorities have urged most Sydney rail commuters to avoid non-essential travel this morning after a power outage ...