Sydney Airport have advised: " Due to adverse weather conditions today, we expect that International and Domestic terminals will experience some flight delays and cancellations. Please contact your airline for more information."
While NSW police are recommending you stay off the roads.
"We're asking all road users to perhaps reconsider the need to be on the road through what will be a severe rain event," NSW Police Chief Inspector Phillip Brooks said.
"Drivers, riders, cyclists and pedestrians need to make sure they are safe on our roads."
One person has summed it up perfectly.
Tweeting, Julie Williams requested someone bring her an umbrella for $10.
Having been outside - we'd recommend a canoe.
What to do in a flash flooding:
- Get to high ground
-Stay off roads
-Avoid power lines
-Don't cross flooded areas