Which warnings are in place?
As of 6am, Natural Resources Wales issued four severe flood warnings - meaning "significant risk to life and significant disruption to the community is expected".
These are in effect along the River Monnow in Skenfrith, Osbaston and Over Monnow, as well as the River Wye at Monmouth.
Monmouthshire County Council has urged residents to avoid travelling.
A further eight flood warnings and 39 flood alerts have been issued across Wales, while 81 flood warnings and 187 flood alerts have also been issued across England.
A yellow alert for cold weather has also been issued by the UK Health Security Agency (UKHSA). The alert is in place from 8am on Monday 17 November until 8am on Friday 21 November.
Ireland's meteorological service, Met Eireann, has also issued weather warnings, with significant rain likely in the southeast for Dublin, Wexford and Wicklow into Saturday morning.
It warns that significant flooding is possible, along with hazardous travel conditions.