The severe storm that slammed into Sydney today, causing damage to homes and flight delays, also produced spectacular images caught on cameras across the city.

Photographers posted photos of their pictures of the tempest, mainly ominous clouds lit by flashes of lightning, on social media.

The hail, lightning and heavy rain hit parts of Sydney around lunchtime, hammering suburbs from Hornsby, in Sydney's north, to the Harbour and CBD, and west to Sydney Olympic Park.

The Bureau of Meteorology had issued a severe weather warning for Sydney, Newcastle and Wollongong.

The warning was withdrawn as the storm headed east.

However, the State Emergency Service advised people to still stay clear of fallen power lines, as well as creeks and storm drains.

Flights at Sydney Airport were delayed as baggage handlers were unable to go on the tarmac while the storm hit.

A spokeswoman for Sydney Airport said planes could still take off and land but baggage handlers were not allowed onto the tarmac for safety reasons.

She said passengers should check with their airlines to see if their flight was delayed.

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