Fire crews had to rescue a dozen residents from their homes after about 0.6in (15mm) of rain fell in one hour in a town already affected by flooding.
Market Street in Tenbury Wells is under water again
People in Tenbury Wells have only just cleaned up after last month's floods but have again seen water seep under the doors and into their houses.
A hotel has been booked by the local council to house those who cannot go back to their homes overnight.
The fire service said an amazing amount of rain had fallen on the town.
Hereford and Worcester Fire Service spokesman, Alec Mackie, said water had reached 3ft (0.9m) following a heavy burst of rain.
'Burst of rain'
"We have got rescue boats in the town operating and the water is now at least three feet deep."
Three weeks ago, 25 people had to be rescued when the River Teme burst its banks.
Mr Mackie added: "As a result of all the rain that has fallen, this sudden burst of rain has had nowhere to go. The land, the stream and sewage system cannot take it so it has ended up in the town centre."
One Market Street trader, Sarah MacDonald who owns a wine bar, said she had only just reopened her store and was now flooded again. Some shops have not yet managed to reopen.
She said it seemed as if drains were not coping with the amount of water and levels on the nearby brook had risen.
The Met Office has issued warnings of heavy and thundery showers with the risk of hail.
Rainfall totals of about 0.8in (20mm) are possible in places within a short period of time, it said.
Tenbury Wells mayor, Phil Grove, said the council had booked a hotel so people coming home from work would have somewhere to stay if their homes were uninhabitable.
"We had considerable rainstorms which has affected many householders in Tenbury plus Cross Street has also been flooded again, worse than what it was a fortnight ago," he said.
"We have many householders whose houses have been flooded but unfortunately they haven't returned home yet.
"And obviously they're going to come home to some considerable shocks I'm afraid."
West Mercia Police have advised that all routes south of Teme Bridge in Tenbury Wells are affected by the flooding with no access into the town over Teme bridge.
An area immediately south of Teme St (town centre) is impassable.
The flooding also affects access to the town from the B4204, B4214, A4112 and the Berrington Road.
The water has started to subside.