Emergency services are warning drivers to take extra care on the roads as heavy rainfall and thunderstorms are expected over the next few days.
It follows an incident on Sunday, August 16, in which a car crashed near Caersws.
Met Office said there will be "unusually strong winds" for this time of year along with plenty of wet weather.
Area Manager Craig Flannery, Mid and West Wales Fire and Rescue Service said: "Please do not drive through floodwater. By doing so, you are putting yourself and others at unnecessary risk.
"It only takes one foot, or 30cm, of moving water to float your car and as little as an eggcup-full of water, going into your engine, is enough to wreck it.
"Flood water can be deceptively powerful – it can literally rip up the road surface and dislodge manhole covers and kerbstones – and its depth and flow rate can quickly change with the weather".
Mr Flannery added: "So please, if you are driving and come across floodwater on the road, just turn around rather than put yourself and your vehicle at risk.”
8065 - great community spirit this evening in the Abercrave and this picture says it all, everyone pulling together to help those affected by the flooding, thank you boys, your parents must be very proud as we all are. @mawwfire @PowysCC pic.twitter.com/eywqKikNO6
— Ystradgynlais Police (@DPP_NPT_Ystrad) August 17, 2020
Last night (Monday, August 17) fire and rescue crews attended flooding incidents in Ystradgynlais, Cwmtwrch and Abercrave in south Powys.
In Ystradgynlais, Amman Valley crews were involved in pumping water from properties and moving residents to higher ground; whilst in Abercrave, crews from Abercrave, Amman Valley, Pontardawe and Seven Sisters worked alongside the police, ambulance service and members of the local community to ensure that everybody was kept safe.
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