The weather system responsible for the lightning, hail and heavy showers over Oahu Sunday night is expected to bring more thunderstorms throughout the islands today and into the work week, forecasters say.

The National Weather Service in Honolulu says that an upper level trough north of the islands will bring unstable atmospheric conditions with locally heavy rainfall and thunderstorms over the Hawaiian islands throughout the day.

Forecasters said that the weather system will linger east of Hawaii Island until Wednesday, bringing unstable conditions mainly over the eastern end of the state. An increase in windward and mauka showers across the state is possible for the second half of this week, they said today.

The weather system brought a dramatic light show for the skies over parts of the state Sunday night, and hail and brief but heavy showers were reported in East Oahu.

Hail pellets, from a quarter-inch to a half-inch in diameter, were reported Sunday night in Hawaii Kai, Waimanalo, Kaneohe and Kailua on Oahu, and in Kamuela on the Big Island, according to the National Weather Service.

The weekend weather system also delivered cooler temperatures, dipping into the high 50s overnight in some areas. The cold weather will likely continue through the weekend.

Today’s forecast for Honolulu calls for a high temperature near 78, with northeast winds at 10 to 16 mph, and gusts up to 21 mph.