A very fast moving weather system heading for Sydney as bad weather forecast for the period ahead.

“Detailed Thunderstorm Warning for Large Hailstones issued for the Illawarra,” BOM of NSW tweeted

The thunderstorm system comes ahead of warnings of severe weather on Wednesday, with authorities preparing for flooding events.

Intense rain and winds are forecast for this Wednesday. Assess your personal flood risk.

Here’s the Sydney Storms weather forecast:
Weather Situation: A low pressure system over central parts of Australia is moving east. This system is expected to enter the northwest of New South Wales today and then track southeast, rapidly intensifying as it crosses the coast about the Greater Sydney area during Wednesday. Intense rainfall and vigorous winds are expected to impact parts of the Illawarra and Greater Sydney area on Wednesday before the low quickly moves east further away from the New South Wales coast.
HEAVY RAIN which may lead to FLASH FLOODING is likely for some parts of the Illawarra, Sydney Metropolitan, Central Coast and Blue Mountains during Wednesday. Widespread moderate to heavy rainfall rainfall is expected in these areas, but the most intense rainfall is likely to be more localised during Wednesday morning and afternoon.
Rainfall is expected to ease late Wednesday and early Thursday as the low pressure system moves further offshore.
DAMAGING WINDS, averaging 60 to 70 km/h with peak gusts in excess of 90 km/h are likely along the coastal Illawarra and Sydney fringe from late Wednesday morning, and extending to the Central Coast and the Hunter coastal fringe during Wednesday evening.
Winds are expected to ease later Thursday as the low moves further away from the coast.
Locations which may be affected include Newcastle, Gosford, Sydney, Wollongong, Nowra and Katoomba.
Severe weather is no longer occurring in the Southern Tablelands district and the warning for this district is CANCELLED.
The State Emergency Service advises that people should:
* Move vehicles under cover or away from trees.
* Secure or put away loose items around your house, yard and balcony.
* Keep at least 8 metres away from fallen power lines or objects that may be energised, such as fences.
* Report fallen power lines to either Ausgrid on 131 388, or Endeavour Energy on 131 003 or Essential Energy on 132 080, as shown on your power bill.
* Don’t drive, ride or walk through flood water.
* Keep clear of creeks and storm drains.
* If you are trapped by flash flooding, seek refuge in the highest available place and ring 000 if you need rescue.
* For emergency help in floods and storms, ring your local SES Unit on 132 500.