A MAN has died after a brick wall collapsed at a building site in Sydney's north west while a teenage boy suffered serious head injuries in another building collapse as wild winds wreaked havoc across the city today.
Emergency services were called to Talinga Street in Carlingford just before 10am today following reports the wall, which was under construction, was blown over in the wind.
A 30-year-old man was trapped under the wall and died.
Police said a teenage boy also suffered serious head injuries after a wall fell on top of him at Thomas Boulton Circuit, Kellyville.
He was taken to Westmead Hospital with "significant head injuries".
Four fire trucks are currently on scene at the Carlingford accident site, where construction was taking place.
"(It was a) building having works done to it, one person was seriously injured on arrival," a Fire and Rescue NSW spokesman said.
Emergency crews are also on their way to investigate power cut to about 1500 homes & businesses in parts of Hornsby and Asquith
Bureau of Meteorology duty forecaster Mohammed Nadi said a cold front is moving right above us which is why we can hear strong wind outside.
Mr Nadi said that while the wind in the Sydney metro area isn't meeting their warning criteria, it does feel extremely strong.
"The strongest wind gust we have recorded was at Sydney Airport at 10.21, and that was 83km/h," Mr Nadi said.
This is followed by Kurnell at 10.15am with a wind gust of 78km/h and Sydney Harbour at 10.23am with a wind gust of 78km/h.
"In terms of the duration of the cold front, we are expecting these stronger gusts to last for the next 90 minutes,"
"Things should settle by about midday, but even in the afternoon we will have breezy conditions, but not as strong as we have got right now," Mr Nadi said.
Hazard reduction burns planned across NSW today have been postponed until later in the week due to the high winds and the unseasonably warm temperatures.
Early this morning the mercury tipped 22 degrees at 4am, a significantly warmer temperature than last year's winter evenings.
"Significant wind but also the warmer weather has made it too dangerous today," he said. "There was quite a number planned that were being undertaken today, that have obviously been postponed.
"We're hoping it is only today and we see a reduction in the wind, and continue later in the week."