Storm Barbara is expected to bring disruptive heavy rain to parts of Hertfordshire, London and Essex on Wednesday.
The Met Office warns that flooding of a few homes and businesses is possible, and journeys via cars and public transport are likely to be delayed due to spray and flooding on roads.
Severe gales could reach the southeast of England, although this is likely to be particularly towards the Kent and Sussex coasts.
Earlier, the Met Office warned the strength and direction of the storm is “relatively uncertain” and it would continue monitoring to see if the storm would affect the UK.
Right now, Storm Barbara is affecting parts of Portugal and Spain before it comes to the south east and possibly central England.
The warning for Storm Barbara should be cleared by Thursday.