Forecasters have predicted the weather system will hit Britain in the morning, with the front reaching Sussex by the afternoon.
Currently there are no warnings issued by the Met Office but with the ground already soaked there’s a strong possibility of surface water appearing on many Sussex roads, causing problems for drivers.
There are warnings for the areas in the UK that have already suffered from severe flooding but the Met Office said these could be extended to south-west and south-east England.
A spokesman said the system is the “remnants” of Storm Jonas, which has battered the US East Coast killing 18 people.
“There will be several low pressure systems which will work their way across the UK,” he added.
“We are in for some heavy rain and strong winds.
“The amounts of rainfall could be pretty high, there is potential for 50 to 100mm, which is four inches.”
The Environment Agency said it is monitoring river levels and has warned residents to “be prepared for the possibility of flooding”.
“We will monitor rainfall closely and urge communities to be vigilant,” a spokesman said.
Storm Jonas brought hurricane-force winds and up to 60cm of snowfall to the East Coast of America, bringing many states to a standstill.
Inbound and outbound flights from major airports across America were cancelled, at least 45 of which were coming from or going to the UK.
A state of emergency was declared across a vast swathe of the eastern seaboard, with schools and government offices closed, sports and entertainment events called off and thousands of homes without power.
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