A flood alert has been issued for the tidal reaches of the River Ouse as snowmelt further rainfall causes river levels to rise.
Environment Agency officers triggered the alert shortly after 8 o'clock tonight with officials continuing to monitor the situation through the night.
A 'flood alert' is the lowest level of alert issued by the agency and means flooding is possible and residents should be prepared. The higher level alerts are 'flood warning' (flooding expected) and 'severe flood warning'.
A flood warning has been issued for Naburn Lock where river levels expected to remain high into Wednesday afternoon.