The Met Office has adjusted its Adverse Weather Alert, from the period Thursday to Friday, pulling it up by 24 hours to now go in effect from midday Wednesday.
The alert level remains at yellow.
The Met Office says there is a 70% chance of intermittent heavy showers or thunderstorms during the period, which may lead to street/flash flooding as well as landslides/landslips in areas so prone.
Gusty winds can also be experienced in the vicinity of heavy downpours.
This activity is due to the Inter-Tropical Convergence Zone (ITCZ).
Rainfall accumulations of 50 -75 mm can be expected over the period, with higher amounts in isolated areas.