Low pressure brings stormy end to the week | Weather In Focus

A broad upper-level low pressure system interacting with moisture-laden air from the tropics is causing the wet and stormy weather.

Up until 9am Thursday, September 30 Cowra had recorded 26.4mm in the previous 24 hours which followed 22.4mm in the 24 hours up until 9am Wednesday, September 29.

Cowra has received 93.2mm so far in September.

Weatherzone said the rain is the first substantial outbreak of rain and thunderstorms we have seen so far this spring, impacting most of NSW and several other states in eastern and south eastern Australia.

"Showers and storms started to build across eastern Australia on Tuesday and by Wednesday, more than half a million lightning strikes had been detected within an 800 kilometre radius of Cobar over a 24-hour period," Weatherzone's Ben Domensino said.

"On Wednesday, the rain and storms became more intense and widespread as the system moved further east, allowing it to feed of increasing levels of moisture flowing in from the Coral and Tasman Seas," he said.

"This resulted in heavy rain and severe storms in some areas.

"Showers and thunderstorms are expected to continue over a broad area of southern, central, eastern and northern NSW on Thursday and Friday.

"Severe thunderstorms are again likely on both days, with damaging winds, large hail and heavy rain all a risk.

"While there will still be some showers and storms in the state's east on Saturday, conditions should ease over the weekend as the atmosphere becomes more stable.

"Most inland districts of NSW will see rain this week, except for some areas in the state's far west and northwest.

"The heaviest falls are likely to occur to the west of the Great Dividing Range, where accumulated totals of 30 to 60 millimetres are likely over a broad area of the slopes, plains and tablelands by the end of the week," he said.

Cowra is expected to see between 10 and 20mm today, Thursday with the chance of between one and 5mm on Friday and showers over the weekend.