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The Honolulu Advertiser

Updated at 3:37 p.m., Sunday, August 26, 2007

Heavy rain possible for Kauai, Oahu today

Advertiser Staff

An upper level low-pressure system north of Kauai has made the atmosphere unstable and caused the winds to shift to the southeast and weaken, according to the National Weather Service forecast for Hawai'i.

With the instability and light southeast flow, heavy showers are possible today on Kaua'i and O'ahu, forecasters said.

The low pressure system is expected to move far enough to the northwest by Monday to bring more stable conditions to the islands and end the threat of heavy showers. A surface ridge will slowly build north of the islands during the new week.

Light winds are expected to return on Monday and build to moderate strength later in the week.

Here's a closer look at the next few days:

Today, partly sunny with isolated showers. Locally heavy rainfall possible in the late morning and afternoon. Highs around 86. Northeast winds around 10 mph shifting to the southeast in the late morning and afternoon. Chance of rain 20 percent.

Tonight, mostly clear. Isolated showers early in the evening. Locally heavy rainfall possible early in the evening. Lows 67 to 75. Northeast winds around 10 mph shifting to the north in the late evening and overnight. Chance of rain 20 percent.

Monday, mostly sunny with isolated showers. Highs 82 to 89. East winds 10 to 15 mph. Chance of rain 20 percent.

Monday night, partly cloudy with isolated showers. Lows 68 to 75. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Tuesday, mostly sunny with isolated showers. Highs 83 to 89. East winds 10 to 15 mph. Chance of rain 20 percent.

Tuesday night, partly cloudy with isolated showers. Lows 68 to 76. Northeast winds 10 to 15 mph. Chance of rain 20 percent.