Moisture associated with the remnants of Norbert will continue to move from east to west across the state through Friday, bringing more widespread shower activity, especially for windward and mauka locations. Some showers will be heavy at times with a slight chance of thunderstorms. A Flood Watch remains in effect for all the main Hawaiian islands through early Friday morning. Drier air will move back in this weekend behind the departing trough. Moisture from the remnants of Tropical Depression 15-E may bring another round of enhanced trade showers by the middle of next week.
A slow moving easterly trough, the remnants of TC Norbert, is pulling in a more moist air mass and will be impacting the islands through Friday. This will result in a continued greater frequency of showers with brief periods of moderate intensity rain. Decks will tempo lower into IFR/MVFR categories during times of more intense rainfall. Typically breezy trades will persist through the period with wind-sheltered area breezes remaining light and variable.
AIRMET SIERRA remains in effect for island-wide mountain obscuration near or above 1,500 ft.
AIRMET ZULU is in effect for icing within a FL170-280 layer to account for the earlier late afternoon thunderstorm activity along Big Island's Mauna Kea windward slopes.
Moisture from the remnants of Norbert and a trough aloft will bring a chance of thunderstorms through tomorrow morning. Trade winds will strengthen slightly through this weekend and maintain through at least the first half of next week. A Small Craft Advisory is posted for the typical windy waters around Maui County and Big Island through Friday night, and will continue into next week for these waters.
A south swell will fill in early Friday and surf will reach near advisory levels by Saturday. Surf along east-facing shores will maintain over the next several days as the east swell from Norbert declines, but it replaced by chop from the building trade winds. Flat to tiny surf along north facing shores is expected through the forecast period.
Flood Watch until 6 AM HST Friday for Big Island East-Big Island Interior-Big Island North-Big Island South-Big Island Southeast- Big Island Summits-Central Oahu-East Honolulu-Ewa Plain- Haleakala Summit-Honolulu Metro-Kahoolawe-Kauai East-Kauai Mountains-Kauai North-Kauai South-Kauai Southwest-Kipahulu- Kohala-Kona-Koolau Leeward-Koolau Windward-Lanai Leeward-Lanai Mauka-Lanai South-Lanai Windward-Maui Central Valley North-Maui Central Valley South-Maui Leeward West-Maui Windward West- Molokai Leeward South-Molokai North-Molokai Southeast-Molokai West-Molokai Windward-Niihau-Oahu North Shore-Olomana-South Haleakala-South Maui/Upcountry-Waianae Coast-Waianae Mountains- Windward Haleakala.
Small Craft Advisory until 6 AM HST Saturday for Alenuihaha Channel-Big Island Leeward Waters-Big Island Southeast Waters- Big Island Windward Waters-Maalaea Bay-Pailolo Channel.
