Source: Bureau of Meteorology

For people in parts of Hunter, Metropolitan, Illawarra and Central Tablelands Forecast Districts.

Issued at 11:03 am Wednesday, 20 December 2023.

Persistent shower activity producing heavy falls about the ranges around Sydney and in parts of the Hunter.

Weather Situation: A moist airmass ahead of a southerly change, combined with a slow moving trough, is generating persistent shower and possible thunderstorm activity producing heavy rainfall, particularly in elevated parts.

Severe thunderstorms are likely to produce heavy rainfall that may lead to flash flooding in the warning area over the next several hours. Locations which may be affected include Gosford, Bowral, Katoomba, Jenolan Caves, Springwood and Bilpin.

Severe thunderstorms are no longer occurring in the Southern Tablelands district and the warning for this district is CANCELLED.

54mm recorded in the 4 hrs to 10:47 am at Hampton.

58mm recorded in the 5 hrs to 09:38 am at Oberon.

49 mm recorded in the 2 hrs to 9:23 at Medlow Bath.

The State Emergency Service advises that people should:
* Keep clear of creeks and storm drains.
* Don't walk, ride your bike or drive through flood water.
* If you are trapped by flash flooding, seek refuge in the highest available place and ring 000 if you need rescue.
* Be aware that run-off from rainfall in fire affected areas may behave differently and be more rapid. It may also contain debris such as ash, soil, trees and rocks.
* After bushfires, heavy rain and the loss of foliage can make the ground soft and heavy, leading to a greater chance of landslides.
* Unplug computers and appliances.
* Avoid using the phone during the storm.
* Stay indoors away from windows, and keep children and pets indoors as well.
* Stay vigilant and monitor conditions. Note that the landscape may have changed following bushfires.
* For emergency help in floods and storms, ring the SES (NSW and ACT) on 132 500.