Aerial footage has captured the horrific extent of flash flooding in the regional Queensland city of Hervey Bay after thousands were suddenly inundated with devastating floodwaters.

Brisbane Times has collated the latest information on everything you need to know to get you through this extreme weather event.

Ex-Cyclone Alfred has left heavy rain and flash flooding in its wake, track rainfall totals and wind speeds at key locations.

Residents in parts of south-east Queensland and northern New South Wales have begun the mammoth task of cleaning up from ex-Tropical Cyclone Alfred's wild weather.