An extremely active tropical wave is expected to bring frequent heavy rain, with active thunderstorms and gusty winds to Saint Lucia tonight. There is a moderate risk of rainfall intensities between 25 to 40 mm/h in localized downpours. Rainfall of this intensity can cause surface and/or flash flooding, especially in areas such as Bexon, Soufriere, and Castries Town and their vicinity and other low-lying areas such as streams, rivers or narrow valleys, and may also lead to slips in the vicinity. Strong winds and lightning can affect the electricity grid. Impact: Ponds, streams and canals may rise rapidly. Surface flooding, rock fall, landslips, and difficult driving conditions possible. Commute times will be longer. Electricity power outage possible.