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Niala Could Bring up to 16 Inches of Rain This Weekend

September 26, 2015, 1:32 AM HST
* Updated September 25, 10:37 PM
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Alerts

A Tropical Storm Watch is posted for Big Island waters through 6:00 a.m. Monday for the possibility of tropical storm conditions on the Big Island and coastal waters.

A Flood Watch is posted for the possibility of very heavy rain and flash flooding through Monday afternoon. Rain is expected to be the greatest hazard with respect to Niala. Rain amounts of 6 to 12 inches and up to 16 inches are possible.

The ground is saturated so flooding may occur quicker than usual. Also, heavy rain events of this size may cause flooding in areas outside the designated flood zones. Low spots in the road will become dangerous and impassable due to severe runoff. High amounts of debris in streams and gulches may clog bridges and culverts resulting in dangerous flooding outside the normal channel and significant property damage.

A High Surf Advisory is posted for easterly exposures with wave heights of 5 to 8 feet or more expected through 6 a.m. Monday. The surf is forecast to build Saturday, peak Saturday night and Sunday and fade Sunday night into Monday.

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**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

Breezy trade winds are expected to keep most showers focused over windward slopes into next week, though afternoon showers also will occur over some lee slopes. The track of Niala has the potential to change our forecast. For now, the system should turn west and pass to the south over the weekend. If the forecasts holds, winds could kick up a notch maybe even reaching tropical storm strength in some areas of the Big Island. A moist and unstable air mass from the deep tropics likely will bring heavy showers and thunderstorms to the Big Island into next week. Southeast slopes are expected to get heavy rain and possible thunderstorms. Models are yet certain how far north this moisture will be able to push. Will keep you up to date.

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Today 

We expect heavy rain today with a slight change of thunderstorms in the afternoon. Frequent showers are expected in windward and mauka spots this morning with scattered showers for leeward areas in the morning. High temperatures from 86° to 91°. Breezy northeast winds are forecast from 15 to 30 mph.

UV index at 11 (“extreme” exposure level)

 

Tonight

Northeast winds are expected in the evening from 15 to 30 mph. Low temperatures from 72° to 77°. Mostly cloudy skies are expected in the evening with heavy rain and a slight chance of thunderstorms.

 

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 / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

Image: NOAA / NWS

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