From Environment Agency:

River levels are forecast to rise at the Hay-On-Wye river gauge as a result of heavy rainfall. Consequently, flooding of roads and farmland is possible from 19:00 Friday, 21/05. We expect flooding to affect low lying land and roads along the River Wye from Hay on Wye to Ross on Wye. Other locations that may be affected include the A438, Byford, Bredwardine and Hereford. Predicted peaks:- Hay on Wye 1.9m to 2.3m at Friday evening, 21/05. Further rainfall is forecast over the next 24 hours. We expect river levels to remain high over the next few days. We are closely monitoring the situation. Our incident response staff are checking defences and clearing weed screens. Please avoid using low lying footpaths near local watercourses and plan driving routes to avoid low lying roads near rivers, which may be flooded. This message will be updated by 10:00 on 22/05/21, or as the situation changes.