A surface trough is oriented NE-SW across Kauai County this afternoon, with thunderstorms forming and moving toward Niihau and Kauai as of 2 PM HST. This trough will move west tonight and remain to the west Tuesday. A new cold front will approach from the northwest Tue night into Wed, adding its moisture and convergence to the remains of the initial trough and moving back southeast toward Kauai County. The main area of concern for potential heavy rain for mid to late-week is therefore Kauai and Niihau. There is a chance that this feature could get near Oahu. After trending away from Oahu the past couple of days, the very latest guidance is moving back toward a higher chance of it reaching the island.
Flood Watch until 6 AM HST Tuesday for Niihau-Kauai-
High Surf Advisory until 6 AM HST Tuesday for Niihau-Oahu North Shore-Maui Windward West-Kona-Kohala-Kauai North-Molokai Windward-Molokai North-Maui Central Valley North-Windward Haleakala-Big Island East-Big Island North.
Small Craft Advisory until 6 AM HST Tuesday for Kaiwi Channel- Maui County Windward Waters-Alenuihaha Channel-Big Island Windward Waters.
