Today: Cloudy and breezy. Showers in the morning, then numerous showers in the afternoon. Highs around 81 near the shore to 66 to 71 at 4000 feet. Northeast winds 10 to 25 mph with gusts up to 50 mph. Chance of rain 80 percent.
Tonight: Mostly cloudy with numerous showers. Lows around 66 near the shore to around 52 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 70 percent.
Friday: Breezy. Cloudy with numerous showers in the morning, then partly sunny with scattered showers in the afternoon. Highs around 80 near the shore to 65 to 70 at 4000 feet. Northeast winds 10 to 25 mph with gusts up to 50 mph. Chance of rain 70 percent.
Kona
Today: Mostly sunny. Scattered showers in the afternoon. Highs 81 to 86 near the shore to around 72 near 5000 feet. East winds around 10 mph shifting to the northwest up to 10 mph in the afternoon. Gusts up to 25 mph. Chance of rain 40 percent.
Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 66 to 71 near the shore to around 53 near 5000 feet. East winds up to 10 mph. Chance of rain 40 percent.
ARTICLE CONTINUES BELOW AD
ARTICLE CONTINUES BELOW AD
Friday: Mostly sunny. Scattered showers in the afternoon. Highs 80 to 85 near the shore to around 71 near 5000 feet. East winds up to 15 mph shifting to the north in the afternoon. Chance of rain 50 percent.
Waimea
Today: Very windy. Partly sunny with scattered showers. Highs around 80 near the shore to 72 to 79 near 3000 feet. East winds 15 to 40 mph with gusts to 60 mph. Chance of rain 50 percent.
Tonight: Very windy. Mostly cloudy with scattered showers. Lows around 65 near the shore to 51 to 59 near 3000 feet. East winds 15 to 40 mph with gusts to 60 mph. Chance of rain 50 percent.
Friday: Windy. Partly sunny with scattered showers. Highs around 79 near the shore to 71 to 78 near 3000 feet. East winds 15 to 35 mph. Gusts up to 60 mph. Chance of rain 50 percent.
Kohala
Today: Very windy. Partly sunny with scattered showers. Highs around 80 near the shore to 72 to 79 near 3000 feet. East winds 15 to 40 mph with gusts to 60 mph. Chance of rain 50 percent.
ARTICLE CONTINUES BELOW AD
Tonight: Very windy. Mostly cloudy with scattered showers. Lows around 65 near the shore to 51 to 59 near 3000 feet. East winds 15 to 40 mph with gusts to 60 mph. Chance of rain 50 percent.
Friday: Windy. Partly sunny with scattered showers. Highs around 79 near the shore to 71 to 78 near 3000 feet. East winds 15 to 35 mph. Gusts up to 60 mph. Chance of rain 50 percent.
South Big Island
Today: Sunny and windy. Highs around 84 near the shore to around 73 near 5000 feet. East winds 15 to 30 mph with gusts up to 50 mph.
Tonight: Partly cloudy. Windy. Isolated showers in the evening. Lows around 68 near the shore to around 52 near 5000 feet. East winds 15 to 30 mph with gusts up to 50 mph. Chance of rain 20 percent.
Friday: Mostly sunny. Windy. Isolated showers in the afternoon. Highs around 83 near the shore to around 72 near 5000 feet. East winds 15 to 30 mph with gusts up to 50 mph. Chance of rain 20 percent.
Puna
ARTICLE CONTINUES BELOW AD
Today: Cloudy and breezy. Showers in the morning, then numerous showers in the afternoon. Highs around 81 near the shore to 66 to 71 at 4000 feet. Northeast winds 10 to 25 mph with gusts up to 50 mph. Chance of rain 80 percent.
Tonight: Mostly cloudy with numerous showers. Lows around 66 near the shore to around 52 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 70 percent.
Friday: Breezy. Cloudy with numerous showers in the morning, then partly sunny with scattered showers in the afternoon. Highs around 80 near the shore to 65 to 70 at 4000 feet. Northeast winds 10 to 25 mph with gusts up to 50 mph. Chance of rain 70 percent.
Waikoloa
Today: Mostly sunny. Windy. Isolated showers in the afternoon. Highs around 83 near the shore to 67 to 74 above 4000 feet. East winds 10 to 35 mph shifting to the northeast up to 35 mph in the afternoon. Gusts up to 60 mph. Chance of rain 20 percent.
Tonight: Partly cloudy. Windy. Isolated showers in the evening. Lows around 70 near the shore to 48 to 56 above 4000 feet. East winds up to 30 mph with gusts to 60 mph. Chance of rain 20 percent.
Friday: Sunny and breezy. Highs around 82 near the shore to 66 to 73 above 4000 feet. East winds 10 to 25 mph with gusts to 60 mph decreasing to up to 20 mph with gusts to 50 mph in the afternoon.
Detailed Forecast
Synopsis
A strong high pressure system passing north of the state will continue to produce windy conditions across the region through Friday. Breezy and gusty trade winds will continue through the weekend with a slight decrease in wind speeds. Periods of passing showers will mainly affect windward and mountain areas favoring overnight to early morning hours. East Maui and the Big Island will likely see the highest rainfall coverage. Two weak upper lows deepen over the state by early next week with shower activity remaining in the long range forecast.
Discussion
A strong high pressure system passing north of the Hawaiian Islands will continue to produce windy conditions with strong wind gusts across the region through Friday. Surface wind observations have shown sustained winds in some areas up to 40 mph with wind gusts as high as 65 mph. The strongest winds are currently blowing over the Kohala Mountains and Waimea areas on the Big Island where a High Wind Warning remains in effect. Most areas across the rest of the state will see Wind Advisory level conditions lasting through Friday afternoon. Strong and gusty trade winds may last into Saturday causing an extension in time for these Wind Advisory conditions.
The satellite imagery this morning shows bands of clouds moving from east to west across the state. Periods of showers are expected through the early morning hours, with decreasing shower trends in the afternoon. Strong trade winds will continue to lift Pacific moisture over the mountain slopes of each island through the weekend. Shower activity will favor the typical overnight to early morning hours with less coverage expected over the drier leeward sections of the island chain.
By early next week, the high pressure system northeast of the islands will lift north as two weak upper level low slowly deepen over the state. Trade wind speeds will decrease back into the moderate to breezy range from Monday onward. Long range forecast guidance continues to hint at wet weather solutions for most windward areas through much of next week. Rainfall amounts and thunderstorm potential will be highly dependent upon where these upper lows set up relative to each island and it remains too early to forecast island by island impacts. Stay tuned for weather updates as the forecast time period grows shorter.
Aviation
Strong and gusty trade winds will persist through Friday allowing for passing showers. The highest shower activity will occur during the overnight to early morning hours over windward and mountain areas.
AIRMET Tango for moderate to isolated severe low level turbulence over and downwind of terrain will remain in place. Brief MVFR conditions may occur in passing showers over windward areas, but otherwise VFR conditions will prevail.
Marine
Strong- to gale-force easterly trade winds will continue through the second half of the week as high pressure passes to the north. Gales are most likely over the typically windier waters and channels from Oahu to the Big Island. Seas have responded and expected to top out in the 10 to 15 ft range today through Friday. Although winds and seas should drop slightly over the upcoming weekend as a weakness in the ridge develops far north- northwest of the area, rough boating conditions will continue with Small Craft Advisory conditions expected for all waters.
Surf along north and west facing shores will briefly lower this morning as the swell that peaked over the past couple of days moves out. Recent observations reflect this at the nearshore and offshore buoys with the peak swell energy now down into the 12-13 second bands. As this swell moves out, a fresh north- northwest swell from a gale that developed west of the Date Line early this week will arrive and build down the island chain later today. Forerunners within the 19-21+ second bands have just started showing early this morning. This swell will peak by tonight, hold into Friday, then ease quickly into the weekend. A small long-period northwest swell from a hurricane-force low centered around 1900 nautical miles to the northwest is expected to fill in late Saturday and linger through the weekend.
Surf along east facing shores will quickly ramp up today as the strong trades expand over the state and upstream over the eastern Pacific. This will result in advisory-level surf for most easterly exposures through Friday.
HFO Watches/Warnings/Advisories
High Wind Warning until 6 PM HST Friday for Kohala, Big Island North.
Wind Advisory until 6 PM HST Friday for most of the Hawaiian Islands.
Gale Warning until 6 PM HST Friday for Kaiwi Channel, Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
Small Craft Advisory until 6 PM HST Friday for most Hawaiian coastal waters.
High Surf Advisory until 6 AM HST Saturday for east facing shores.
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