Tradewinds are back, but unstable atmospheric conditions and moisture left over from a passing weather system are bringing what forecasters called “enhanced trade showers.”

The cooling northeast tradewinds are blowing at 15 to 20 mph, sending scattered showers to windward and mauka sides of all islands. Some of the showers are crossing the mountains into leeward sections.

A slight chance of thunderstorms remains in the forecast for the Big Island.

The forecast for south shores on Oahu from Hawaii Kai to Kapolei called for mostly sunny skies with a 50 percent chance of scattered showers, mostly during the mornings on Tuesday and Wednesday.