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Wali weakening, heavy rainfall still in forecast

July 19, 2014 - 5:58am

At 5 p.m. Friday, the center of post-tropical cyclone Wali was located:

710 miles ESE of Hilo

770 miles ESE of Kailua-Kona

740 miles ESE of South Point

820 miles ESE of Kahului

875 miles ESE of Kaunakakai

850 miles ESE of Lanai City

920 miles ESE of Honolulu

1,020 miles ESE of Lihue

1,065 miles ESE of Niihau

A flash flood watch is set to go into effect at 6 p.m. Saturday as the remnants of post tropical cyclone Wali continues to march toward the Big Island.

The system, located about 700 miles east-southeast of Hilo, weakened to a depression Friday morning and was moving northwest around 12 mph as of 5 p.m. Friday. Wali is expected to continue weakening into a post-tropical remnant low but could dump up to a foot of rain in some areas, Central Pacific Hurricane Center forecasters in Honolulu say.

Forecasters expect heavy rain and thunderstorms from Saturday night through 6 p.m. Monday, according to the National Weather Service in Honolulu. Showers are expected to reach the windward side of the Big Island on Saturday night.

The greatest chance of flooding will occur along the windward slopes, forecasters say. There is a lesser chance of flooding along leeward slopes.

A flash flood watch means that conditions may develop that lead to flash flooding, according to the service. The public is advised to remember that it does not have to be raining heavily in the immediate vicinity for flash flooding to occur. Residents and visitors should avoid camping or hiking near streams of low-lying flood-prone areas.

The state Department of Land and Natural Resources closed Muliwai Trail and the Waimanu Valley campground in North Kohala as a precaution against flash-flooding in nearby streams. The agency also closed trails and forests on Maui.

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