The latest National Weather Service forecast said a moist air mass was headed toward the Big Island this morning and is expected to bring showers and thunderstorms.

The storm should hit most of the state by Sunday, the Weather Service said.

Christmas Day: Showers likely. The rain could be heavy at times. Mostly cloudy, with a high near 81. East wind around 18 mph, with gusts as high as 28 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 69. East wind around 14 mph, with gusts as high as 21 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.

Friday: Scattered showers. Mostly cloudy, with a high near 79. East wind between 14 and 17 mph, with gusts as high as 26 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.

Friday Night: Scattered showers. Mostly cloudy, with a low around 68. East wind around 11 mph, with gusts as high as 18 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.

Saturday: Scattered showers. Mostly cloudy, with a high near 79. East wind between 11 and 13 mph, with gusts as high as 20 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.

Saturday Night: Showers likely. The rain could be heavy at times. Mostly cloudy, with a low around 67. East wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

Sunday: Scattered showers. Mostly cloudy, with a high near 79. East wind around 14 mph, with gusts as high as 22 mph. Chance of precipitation is 40%.

Sunday Night: Scattered showers. Mostly cloudy, with a low around 67. East wind around 13 mph, with gusts as high as 21 mph. Chance of precipitation is 40%.

Monday: Scattered showers. Mostly cloudy, with a high near 79. East wind between 13 and 15 mph, with gusts as high as 22 mph. Chance of precipitation is 30%.

Monday Night: Scattered showers. Mostly cloudy, with a low around 67. East wind around 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Tuesday: Scattered showers. Mostly cloudy, with a high near 79. East wind between 11 and 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

Tuesday Night: Scattered showers. Mostly cloudy, with a low around 67. East wind around 9 mph. Chance of precipitation is 30%.

Wednesday: Scattered showers. Mostly cloudy, with a high near 79. East wind around 9 mph. Chance of precipitation is 30%.