Morrisons supermarket in Aberystwyth had to close some of its tills, after tremors from a suspected sonic boom caused ceiling tiles to move.
The tills were closed briefly while staff checked for damage.
There have been other reports of rooms shaking, after many people heard what they thought was an explosion in the town.
People in Aberystwyth have felt tremors from a suspected sonic boom this lunchtime.
Owain Meredith from ITV News said it happened at around 1310, and the room shock with what initially sounded like an explosion.
He said two jets were seen flying overhead.
Sonic boom in Aberystwyth, shook the office and frightened the seagulls.
The Bath Rock Shelter on Aberystwyth Promenade will be rebuilt using as much of the original timber as possible says Ceredigion Council.
A meeting on Monday between the council and Wales' historical monuments body CADW decided the work would use as much of the original timber as possible.
The work will start when the sea wall has been strengthened and the weather improves which could be before the end of May.
The future of Aberystwyth's iconic seafront shelter that was damaged in January's storms will be discussed later today at a meeting involving Cadw and Ceredigion County Council.
The grade II-listed shelter on the promenade was badly damaged and close to collapse after being batter by the waves. Work has already started to remove the shelter.
It is estimated that the cost of the repairs to the shelter and the town's promenade could be in excess of £1m.
Pembrokeshire County Council says it is helping police with their investigation after ten bus passengers were rescued on Saturday night.
Pembrokeshire County Council’s own enquiries confirmed the road was in the process of being closed and that signage was being erected at Pen-y-Cwm, north of Newgale. However, the Council operatives at Pen-y-Cwm were already directing traffic to use an alternative safe route avoiding the Newgale road. The bus driver was informed of the situation at Newgale and that the alternative route should be followed. However the driver chose to continue his journey along the main road.
A Council operative followed the bus in his own car equipped with a flashing orange beacon on the roof. He was also flashing his headlights in an attempt the stop the bus but was unsuccessful. A member of the public on the bridge at the bottom Pen-y-Cwm Hill also tried to flag the bus down with a torch but he too was unsuccessful. The Council has provided information to the police in relation to their investigation into the incident.
Heavy machinery has removed the bus from water at Newgale, Pembrokeshire.
Ten people were rescued on Saturday night after a large wave swept the vehicle into the water.
Aberystwyth University says no student rooms in its residences on the town's seafront were damaged by last night's waves.
The university is still warning students living in temporary accommodation or who have travelled away not to return until Monday afternoon.
Spokesperson Rebecca Davies said the university would review the situation on Monday morning.
Winds in the area reached speeds of more than 50mph on Saturday night.Read the full story ›
Large waves have been lashing the seafront in the Welsh town of Aberystwyth amid high tides and strong winds.
Flood warnings for the whole of the Wales coast will remain in place throughout Saturday, Natural Resources Wales says.
Strong south westerly winds forecast for the rest of the day could combine with tonight's high tide and cause flooding.
People are also warned to stay clear of promenades and sea fronts.