NSW residents have been warned to keep children and pets indoors on Tuesday afternoon when winds are expected to reach speeds of 110km/h.

The State Emergency Service (SES) is advising residents in the Sydney, Hunter and Illawarra regions to park their cars under cover and remove loose items from gardens and balconies.

The damaging winds are expected to peak at around 4pm.

“The worst will come this afternoon,” SES spokesman Phil Campbell told AAP on Tuesday morning.

“At those speeds, there is potential for some damage.”

The SES has so far received 51 calls for help.

Of those 33 were from the Illawarra and South Coast regions and mostly involved downed trees and minor roof damage, Mr Campbell said.

Meanwhile, heavy snow in the Blue Mountains hasn’t caused any road closures, but the SES is keeping a close eye on the area.

The Bureau of Meteorology (BOM) predicts Tuesday’s gusty winds will make the day feel much colder than forecast temperatures, including 17C for Sydney.

The cold front is bringing blizzard conditions to the southern ranges, including snowfall of 30mm-80mm over Monday and Tuesday.