A weather condition just west of Kaua'i has made the atmosphere moist and unstable and caused the winds to shift to the southeast, the National Weather Service said.

The weather is likely to be unsettled through Thursday night, during which time a flash flood watch will remain in effect.

Skies may be quite gray due to a combination of high clouds and haze from volcanic activity on the Big Island.

By Friday the winds are expected to shift back out of the east and the showers will be less likely as the atmosphere becomes more stable.

Here's a closer look at the next few days:

Today: Scattered showers, then showers likely and possibly a thunderstorm after noon. Some of the storms could produce heavy rainfall. Widespread haze. Mostly cloudy, with a high near 81. Light wind becoming east between 11 and 14 mph. Chance of precipitation is 60 percent. New rainfall amounts between a quarter and half of an inch possible.

Tonight: Scattered showers and thunderstorms. Some of the storms could produce heavy rainfall. Widespread haze before midnight. Mostly cloudy, with a low around 70. East wind around 7 mph. Chance of precipitation is 40 percent. New rainfall amounts between a half and three quarters of an inch possible.

Thursday: Scattered showers, with thunderstorms also possible after noon. Some of the storms could produce heavy rainfall. Mostly cloudy, with a high near 81. East wind around 15 mph, with gusts as high as 20 mph. Chance of precipitation is 30 percent. New rainfall amounts between a quarter and half of an inch possible.

Thursday night: Scattered showers. Mostly cloudy, with a low around 70. East wind around 11 mph. Chance of precipitation is 30 percent. New rainfall amounts between a tenth and quarter of an inch possible.

Friday: Scattered showers, mainly after noon. Mostly cloudy, with a high near 81. East wind around 14 mph. Chance of precipitation is 30 percent.

Friday night: Scattered showers. Mostly cloudy, with a low around 69. East wind around 11 mph. Chance of precipitation is 30 percent.