Natural Resources Wales is asking people to be alert for flooding as heavy rain is expected to affect Wales overnight (Friday into Saturday).
There is also a risk of localised torrential downpours during the first half of Saturday, which could cause localised flooding of roads, and flooding from drains, ditches and small streams.
The Met Office has forecast that the rain is expected to affect most of Wales with the heaviest downpours most likely in parts of north east Wales.
There is also a risk that that localised torrential downpours could cause smaller, faster responding rivers to rise.
Natural Resources Wales will issue Flood Alerts and Warnings if rivers reach trigger levels.
People travelling tomorrow are advised to take extra care and allow extra time for their journey as driving conditions may be hazardous.
Natural Resources Wales is advising people to keep an eye on weather reports and local news for details of any disruption in their area.
Flood alerts and flood warnings are updated on the Natural Resources Wales website every 15 minutes, at www.naturalresourceswales.gov.uk/alerts.
Information and updates are also available via Natural Resources Wales’ twitter account: @natreswales.