HONOLULU, Hawaii (HawaiiNewsNow) - A strong cold front will continue to move southeastward down the island chain, stalling near the Big Island on Monday. Strong sustained north to northeasterly winds to around 30 mph with higher gusts will develop after the front passes each island. Added instability from an upper level low disturbance behind the front will add to the rainfall production. High pressure building north of the island chain will bring trade winds back into the state by Tuesday, pushing the diminishing frontal band back towards the western islands with another round of widespread rainfall for Molokai, Oahu and Kauai. Windward and mountain areas will likely see the highest rainfall totals on Monday and Tuesday due to strong northeasterly winds. Elevated Flash Flooding threats are forecast with heavy rainfall developing along the frontal zone from Oahu to Maui County, and into the Big Island through Tuesday.
The High Surf Warning remains in place for the exposed N and W facing shores of most islands, which is good through Monday night. This NW swell is not as large as the previous one from Saturday, which reached 19 feet, but the expected maximum height of 15 feet is still very large and poses an extreme danger to life and property. The swell will be severely impacted by very strong and gusty N to NE winds, resulting in very poor surf quality. Seas will not only be elevated but very rough and choppy. The swell energy will also reach parts of the Big Island, but on a smaller scale. A High Surf Advisory is in effect through Monday night for the exposed N and W facing shores of the island.