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Unstable weather moved over the islands Monday and the threat of thunderstorms will remain over the islands through late Wednesday.

The combination of an approaching storm and a moist, unstable airmass over the state will lead to an increasing chance for heavy showers and thunderstorms.

Spotty activity will focus mainly windward and mauka Monday night, but will likely become more widespread by Tuesday as a surface low begins to develop in our vicinity.

The low will shift north of the islands by Thursday and showers will diminish, though a southerly kona flow will keep conditions rather humid and voggy for the rest of the week.

Flood Advisories

A flood advisory has been extended for the island of Kauai until 11:15 p.m.

At 7:45 p.m., satellite and radar indicated heavy rain and thunderstorms on the north side of Mount Waialeale. Rain was falling at a rate of 1 to 2 inches per hour.

Locations in the advisory include but are not limited to Lihue, Kapaa, Kalaheo, Princeville, Kilauea, Omao, Wailua Homesteads, Na Pali State Park, Moloaa, Hanapepe, Hanalei, and Koloa.

A flood advisory is in effect for the island of Oahu until 11:15 p.m.

At 8:21 p.m., radar indicated heavy rain over and near the Koolau Mountains. Rain was falling at a rate of 1 to 2 inches per hour. Minor flooding of poor drainage and low lying areas can be expected.

Locations in the advisory include but are not limited to Honolulu, Maunawili, Kailua, Waikane, Mililani, Hawaii Kai, Salt Lake, Kahuku, Kaneohe, Waiahole, Moanalua and Halawa.

A flood advisory is in effect for West Maui until 11:15 p.m.

At 8:10 p.m., rain gage reports indicated heavy rain falling over the interior of the west Maui Mountains. Rain was falling at a rate of 1 to 2 inches per hour. Run-off from the rain may impact Iao Valley.

Locations in the advisory include but are not limited to Kahului, Lahaina, Kapalua, Waikapu, Maalaea, Honokohau, Wailuku, Kahakuloa, Olowalu, Waihee, Waiehu and Napili-Honokowai.

Stay away from streams, drainage ditches and low lying areas prone toflooding.

Rainfall and runoff will also cause hazardous driving conditions dueto ponding, reduced visibility and poor braking action.

A flash flood watch remains in effect for all islands through Wednesday afternoon.

East to east-southeast winds will strengthen slightly later Monday before weakening late Tuesday and Wednesday. High clouds are expected to spread over portions of the island chain later in the day and night, and then remain in place through Wednesday.

A surface low developing in the vicinity of the islands will result in wet and unsettled weather from late Monday night and Tuesday through the day on Wednesday, with the potential for locally heavy downpours and a chance of thunderstorms.

Any heavy showers will be spotty Monday afternoon, but could become more widespread by Tuesday.

Some streams and normally dry gulches are expected to run high and could quickly overflow their banks. Intense rainfall in poor drainage and urban areas could also lead to flash flooding.

See the article here:

Heavy rain, thunderstorms likely for all islands through Wednesday - KHON2