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Heavy rains and wind have upturned trees, brought down power lines and caused flash flooding in parts of NSW overnight.
More than 30,000 homes across Sydney, the Blue Mountains, Southern Highlands and Illawarra regions lost power after strong winds of up to 160 km/h slammed into the region.
More than 1,230 people called for emergency help across the state. At least 57 people were rescued by emergency services, with many people trapped in cars after driving into floodwaters.
Fire and Rescue NSW also reported two cases of apparent lightning strikes on houses, including one which caused a large fire at a Kellyville home, in the north-west of Sydney.
In Sydney's south, six people were evacuated from a building after a retaining wall collapsed at Allawah.
A family were rescued from their car in the Blue Mountains west of Sydney, where up to 15 centimetres of snow were recorded.
The Great Western Highway was closed in both directions due to snow and ice on the road.
Up to 15cm of snow was recorded in parts of the Blue Mountains, although the SES said milder conditions and rain had begun thawing the snow by early morning on Wednesday.
The NSW south coast was hit hardest by rainfall, with 170mm falling at Lake Conjola and 145mm at Ulladulla.
Sydney’s southern suburbs were also drenched, with 138 millimetres of rain falling at Sans Souci.
Wind gusts of up to 105km/h were recorded at Sydney Airport, while wind gusts of 161km/h were recorded at Wattamolla.
A minor flood warning remains in place for the Cooks River in Marrickville. Flood warnings are also in place at Oxford Falls in Sydney’s north, and at Penrith in the west.
Sydney Airport was hit by wind gusts of up to 106km/h, but despite reports the airport had shut down, a spokeswoman told AAP late on Tuesday that it was operating.
"The thunderstorms are causing delays," she said.
"Flights are coming in and out, the weather is causing delays to unloading aircrafts ... it will contribute to knock-on delays."
More wind, rain on the way
The Bureau of Meteorology is warning this morning of more rain and wind to come.
The warnings current as of this morning include:
- Heavy rain
- Destructive winds
- Very heavy surf
- Dangerous beach conditions
- Flooding in some regional areas
- With AAP