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Flood Watch Posted: Heavy Rain, Thunderstorms Possible

October 23, 2017, 1:26 AM HST
* Updated October 22, 10:34 PM
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Image: James Grenz

Alerts (as of 1:00 a.m.)

Flash Flood Watch: Posted from Monday morning through Tuesday afternoon. Heavy showers associated with an upper trough and cold front moving down the island chain could result in flash flooding Monday through Tuesday. The latest guidance indicates the greatest potential for flooding will occur over Oahu, Maui County and Big Island.

High Wind Watch: Big Island summits from Monday evening through Tuesday. Southwest winds from 45 to 60 mph with gusts up to 70 mph.

Check our breaking news section for any urgent weather alerts or updates to the weather alerts listed above.

**Click directly on the images below to make them larger. Charts include: Big Island high/low forecasted temperatures, projected winds, chance of cloud cover, projected localized weather conditions, vog/SO2 forecast and expected wave heights.**

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Looking Ahead

Southerly winds ahead of a front will bring deep tropical moisture with the potential for heavy rain and flooding through Tuesday. The front is forecast to reach Kauai Monday with cool and dry air filling in behind it as it moves down the island chain. The front is expected to pass east of the Big Island Wednesday night with dry northeast flow forecast for the second half of the week.

 

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Today

We expect south winds around 10 to 20 mph. Mostly cloudy skies are forecast with occasional windward showers and isolated thunderstorms. Showers likely for leeward spots with isolated thunderstorms and locally heavy rainfall possible. Temperatures up to 81° to 86°.

UV index at 8 (“very high” exposure level)

 

Tonight 

Mostly cloudy skies with showers and isolated thunderstorms. Locally heavy rainfall is possible. Low temperatures from 72° to 77°. Winds are expected to be out of the south around 10 to 20 mph.

 

Our Big Island Now Weather homepage always includes daily: Sunrise | Sunset | Moonrise | Moonset | Moon Phase | Live Weather Cams | 5-day Forecast | Current Temperature & Conditions

**Click here for your detailed Big Island surf report.**

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

Image: NOAA

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