HONOLULU (KHON2) - A deep low pressure system is positioned west northwest of the main Hawaiian islands this afternoon, and will be the cause of some active weather over the next few days. At the surface, high pressure north of the associated low is beginning to nose in from the east side of it and will allow trade winds to strengthen Sunday into next week as it sets up far northeast of the area. Winds will veer slightly southeasterly due to the low to the west northwest. Moderate to locally heavy showers in a band connected to the surface low will linger just north of the state over the next few days, with showers and possible thunderstorms along the southern fringes of the band impacting the state at times through at least Sunday. The ingredients and the greatest focus just to the north of the islands do not push confidence high enough for the issuance of a Flood Watch, though the situation will need monitoring. The GFS and ECMWF show the chances for rainfall declining by late Sunday or Monday. The upper low will weaken and broaden out and while the surface low weakens and tracks away to the west. Trade winds will push lingering and upstream moisture across the islands for the first half of the week resulting in lighter and less frequent showers focused windward and mauka showers. Trade winds and windward and mauka showers expected into the second half of the week as well. Wind Advisory until 8 AM HST Sunday for Big Island Summits. ...read more read less