The Met Office has warned that there could be localised flooding in the Londonderry area.
A period of occasionally heavy rain is expected to develop during Monday night and then last through much of Tuesday morning. Rainfall totals of 15-25 mm can be expected widely, with as much as 40 mm over high ground.
The Met Office says: “The public should be aware of the risk of localised flooding and potential disruption to travel.”
The River Faughan in Drumahoe has already burst its banks along parts of the Fincairn Road.