Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 307 AM EDT Thu Sep 09 2021 Valid 00Z Fri Sep 10 2021 - 00Z Fri Sep 17 2021 Near to below normal mid-level heights are favored over the region for about the next week, downstream of a strong upper high near the Dateline. The upper low that was near the islands a few days ago will meander near 30N/145W through Saturday before it interact with the southern part of a trough that will push into the western CONUS. It will likely head back west toward the islands but it remains unclear if it will jog south or maintain a westerly trajectory to the north of the islands late next week. Through most of next week, modest trades will support generally light to perhaps moderate windward and mauka showers as precipitable water values waver near 1.25 inches into the weekend. Depending on the evolution of the upper low to the northeast, more moisture could work into the area by midweek next week. Some solutions tap moisture from the southeast whereas others gradually draw in moisture from the ITCZ south of the region. For now the heaviest QPF signal exists to the northeast of the region but the handling of this feature has been inconsistent over a several day period. Thus, a model consensus seems reasonable for the next seven days. Fracasso