Strong winds have damaged roofs and blown trees down onto roads and power lines in Sydney's west, triggering multiple emergency calls.
The NSW State Emergency Service said it had received 378 calls for help since 3am on Tuesday, with the majority coming from Camden, Campbelltown, Liverpool and Penrith.
While no injuries were reported, there was significant damage including roofs blown off buildings, trees falling onto houses and scaffolding collapsing, the SES said.
Wind gusts of 104km/h were recorded at Badgerys Creek just before 3am, while 98km/h gusts were recorded at Camden.
SES chief superintendent Dallas Burnes said a cold front blew through overnight and calls continued to come in on Tuesday morning as people woke to the damage.
"(Our) jobs involve some power lines down, some roofs blown off (and) we had a car-port relocated to a neighbouring property," he said.
Fire and Rescue NSW crews also responded to dozens of call-outs, including due to arcing power lines that risked sparking bush and grass fires in the dry conditions.
A number of fires flared up during the night, but the agency said it was unclear if they were linked to the storms.
The Transport Management Centre urged motorists to take care and allow extra travel time as a number of roads were closed due to the damage.
There were dozens of unplanned power outages still in place across western Sydney by midday, affecting more than 3000 premises.
As a result of strong westerly winds, Sydney Airport is expected to move to single runway operations.
"This decision is purely weather and safety-related to safeguard the travelling public," a statement from Airservices Australia read.
Delays are anticipated, while several domestic flights to Brisbane, Melbourne and the Gold Coast have been cancelled.
People are encouraged to contact their airlines for further information.
