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The lifting on the windward side of the island is the major concern determining rainfall. It won't be "pretty" at all. I'd expect flash flooding and slides.

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Agreed. WFO Honolulu seems to think so too. Here's the point forecast for Hilo from Monday-Wednesday:

Monday : Frequent showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 78. North wind between 10 and 15 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between 3 and 4 inches possible.

Monday Night: Frequent showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 71. Windy, with a north wind 20 to 23 mph becoming north between 36 and 39 mph. Winds could gust as high as 50 mph. Chance of precipitation is 100%. New rainfall amounts in excess of 4 inches possible.

Tuesday: Frequent showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 80. East wind around 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

Tuesday Night: Occasional showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 73. East wind around 18 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.

Wednesday: Showers likely. The rain could be heavy at times. Mostly cloudy, with a high near 79. Calm wind. Chance of precipitation is 70%.

They seem pretty confident this system's moisture plume is gonna produce lots of rain.

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