WATCH: Hail storms lash Clarence Valley
UPDATE, 7.30PM: A hail storm has swept through Grafton and is heading east towards Minnie Water.
At about 7.10pm the storm hit Grafton's CBD bringing heavy rain and small hail.
Another storm is passing through the Coutts Crossing region.
A number of storm cells have passed through the Clarence Valley today. Earlier this afternoon a heavy thunderstorm passed to the north of Grafton and through Maclean. Another smaller cell hit the Wooli area.
ORIGINAL STORY, 2.30PM: A thunderstorm similar to last night's forecast could possibly hit the Clarence this afternoon.
Meteorologist Craig Ryan said last night's thunderstorm was a real hit or miss.
Last night 25mm of rainfall was recorded in the Grafton catchment, with 26mm at Grafton airport recorded but some areas around where significantly less rainfall fell included 11mm South Grafton and 8.8mm at Pillar Valley.
"Some areas may have received more than 26 mm of rain depending whether they were caught underneath the storm or not," he said.
Mr Ryan said they didn't see any extremely high wind compared to what they saw further down the coast but they can't rule out that some of those predicted strong gusts may have occurred.
"Can't rule out if gusts up to 90km/h an hour were recorded or not. We haven't seen it in any of our instruments but cant rule it out," he said.
A severe storm warning has been issued for this afternoon, with damaging winds and large hailstorms.
Severe thunderstorms are likely to produce damaging winds and large hailstones in the warning area over the next several hours, locations may include Maclean.
The Bureau expect a similar approach tomorrow, similar to yesterday's forecast with strong damaging winds and large hail.
Troughs moving North East, meaning tomorrow will be the last day in which thunderstorms feature in the weather in Grafton.
On Sunday there is a high pressure system expected to come in over the coast and will be a dominant feature, possibility of a light shower or two in Grafton. Coming through to Monday and Tuesday but then conditions are expected to get quite warm again.