A flood alert has been issued for the River Calder from Todmorden to Brighouse.
The environment agency said showers and rain will affect river today (Saturday) and into tomorrow morning.
The alert means flooding is possible and residents should be prepared.
The agency is currently using lower trigger levels for warnings in parts of Upper Calderdale to account for damage to walls and banks during the Boxing Day floods.
Call the Floodline on 0345 988 1188 for more information.