UPDATE: 4:03 p.m.

The National Weather Service in Honolulu has issued a flood watch for all major islands until 6 p.m. Monday.

A flood watch means that conditions are favorable for flash flooding,” according to forecasters.

Flash flooding caused by excessive rainfall is possible due to showers moving over the islands from the south, causing leeward and urban areas to potentially receive significant flood and property damage due to rapid runoff.

“A surface trough will develop west of the islands, allowing deep moisture to move over the islands from the south. While rainfall may be light at first, heavier slow-moving showers are expected to develop, bringing the potential for flash flooding,” according to a statement.

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A high surf advisory is in effect today until early Monday morning for the north- and east-facing shores of Oahu, Maui, Kauai, Molokai and Niihau, and for the north- and west-facing shores of Hawaii island.

According to the National Weather Service in Honolulu, a large north-northeast swell will produce elevated, rough surf along most north- and east-facing shores of the smaller islands then gradually lower later tonight. Forecasters said there will be elevated surf along the north and west shores of Hawaii island.

Forecasters said to expect large, breaking waves of 18 to 22 feet along the north shores, and waves of 8 to 12 feet along the eastern shores. On Hawaii island, waves are expected to reach up to 11 feet along the western shores. Moderate, strong breaking waves and strong currents will make swimming dangerous, forecasters said.

The high surf advisory is in effect until 6 a.m. Monday.

“Head all advice from ocean safety officials. When in doubt, don’t go out,” according to the advisory.