ISOLATED storms could bring heavy rain and hail to the Clarence Valley today and tomorrow.

Weatherzone senior meteorologist Anthony Duke said a low pressure trough lingering over eastern Australia provided "the right ingredients" for storm activity from about 3pm this afternoon

"They'll probably develop first towards the heads of the valleys, but they'll be fairly isolated and not as dramatic or widespread as storms that hit Brisbane yesterday," he said.

That ingredient mix is expected to get a little sweeter for storm chasers tomorrow afternoon, with more instability and moisture likely to develop into a slow moving storm front.

Mr Duke said there was a potential for severe flash flooding.

"Again it is expected to develop on the ranges and roll eastwards," he said.

"We expect it to be fairly slow moving, so if that is the case we might see heavy rain and severe flash flooding, and maybe chance of hail."

Early morning fog in some parts of the Clarence Valley this morning and Sunday was also attributed to the low pressure trough, which is drawing moisture off the Coral Sea.

"This makes for clearer skies and light winds overnight, and allows the moisture to condense at surface level and make fog," Mr Duke said.

"Tomorrow, there might be some patchy fog around but with the early sunrise it won't be sticking around too long."

On Friday, a building high pressure system is expected to bring more settled conditions and higher temperatures to the Clarence Valley, with temperatures forecast to top 30 degrees on Sunday and Monday.

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