Heavy rain, thunderstorms and possible flooding are expected through today as low-level moisture moves up from the southeast and an upper-level trough drops in from the opposite direction, according to the National Weather Service.
A flash flood watch was in effect for Oahu through late Tuesday and for Kahoolawe, Lanai, Maui, Molokai and Hawaii island through late tonight.
An area of deep tropical moisture is expected to hang over the larger islands through tonight, bringing locally heavy showers and thunderstorms, forecasters say.
The weather service warns that excessive rainfall from heavy showers and thunderstorms could lead to flash flooding of streams and low-lying areas.
Hikers and campers are advised to pay close attention to the latest forecasts, warnings and conditions and to stay away from creeks and streams. They are further advised to consider postponing their trips until better weather returns.
A winter storm warning is also in effect for Big Island summits above 12,000 feet, with heavy snowfall already occurring. Snow accumulations are forecast to reach 12 to 24 inches, with localized higher amounts.
The weather service said the heavy snow will be accompanied by strong gusty winds, resulting in “considerable” blowing and drifting snow and reduced visibility.
Meanwhile, a high-surf advisory is in effect for north and east shores of Maui, Molokai, Oahu, Kauai and Niihau through 6 p.m. today because of a northern swell due Tuesday and today.
According to the weather service, a cooler and drier air mass will arrive today and Thursday with another weak front approaching Friday night and Saturday.
KOKUA LINE
Christine Donnelly is on vacation. Kokua Line returns Jan. 4.
