Homes in certain areas are potentially at risk from flooding later in the day after heavy rain pounds East Sussex.
The Environment Agency has issued flood alerts for the Upper Ouse and tributaries from Slaugham to Barcombe Mills.
It said most catchments in Sussex have become saturated following rainfall over recent days and rivers including the Upper Ouse will be very responsive as a result.
Up to 80mm is expected to fall in Sussex between today (Monday December 23) and tomorrow (Christmas Eve.)
The Environment Agency said the river level at Anchor Gates and Barcombe was still high and with this intense low pressure system forecast for today, property at Barcombe Mills, Anchor Gates and property close to the river throughout the Upper Ouse catchment from Slaugham to Barcombe including Haywards Heath was at risk,
The Environment Agency said the river level at Hellingly was still high.
Homes at Cowbeech, Hellingly and Horsebridge and close to the river throughout the Cuckmere catchment run the risk of flooding.
The Environment Agency is monitoring the situation and will issue a Flood Warning if flooding will happen.