Hawaii County climate forecast is August 17, 2021

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Photo credit: James Grenz

Hilo

Today: Mostly sunny in the morning with a few showers, then mostly cloudy with showers, probably in the afternoon. Highs from 82 to 88 near the shore to around 73 at 4000 feet. Southeast winds up to 10 km / h. Chance of rain 60 percent.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows of 65 to 72 near shore to about 54 to 4000 feet. Southwest winds up to 10 km / h. 50 percent chance of rain.

Wednesday: Partly sunny with a few showers. Highs from 81 to 87 near shore to about 72 at 4000 feet. In the afternoon a south wind blows at up to 16 km / h to the south-east. Chance of rain 40 percent.

Kona

Today: Mostly sunny in the morning, then mostly cloudy with showers in the afternoon. Highs from 82 to 87 near shore to 68 to 73 near 5000 feet. Southwest winds up to 10 km / h. Chance of rain 60 percent.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows of 70 to 75 near shore to about 55 near 5000 feet. Breeze. 50 percent chance of rain.

THE ARTICLE CONTINUES BELOW THE ADVERT

Wednesday: Mostly sunny with a few showers in the morning, then partly sunny with a few showers in the afternoon. Highs from 82 to 87 near shore to about 71 near 5000 feet. Northwest winds up to 10 km / h. Chance of rain 40 percent.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Mostly sunny in the morning, then mostly cloudy with a few showers in the afternoon. Highs 71 to 84. Northwest winds up to 10 mph turning northeast in the afternoon. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows of 67 near shore to 55 to 61 near 3000 feet. Breeze. 50 percent chance of rain.

Wednesday: Partly sunny. Isolated showers in the morning, then isolated showers in the afternoon. Altitudes 70 to 83. East winds up to 15 miles per hour. 50 percent chance of rain.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Mostly sunny in the morning, then mostly cloudy with a few showers in the afternoon. Highs 71 to 84. Northwest winds up to 10 mph turning northeast in the afternoon. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows of 67 near shore to 55 to 61 near 3000 feet. Breeze. 50 percent chance of rain.

Wednesday: Partly sunny. Isolated showers in the morning, then isolated showers in the afternoon. Altitudes 70 to 83. East winds up to 15 miles per hour. 50 percent chance of rain.

Southern big island

Today: In the morning mostly sunny with a few showers, then in the afternoon partly sunny with a few showers. Highs from 86 near shore to 76 near 5000 feet. In the afternoon an easterly wind blows at up to 24 km / h to the southeast. 50 percent chance of rain.

Tonight: Partly cloudy. Isolated showers in the evening, then isolated showers after midnight. Lows of about 68 near shore to about 52 near 5000 feet. Northeast winds up to 15 miles per hour. 50 percent chance of rain.

Wednesday: Windy. Mostly sunny with a few showers in the morning, then partly sunny with a few showers in the afternoon. Highs from 85 near shore to 75 near 5000 feet. East wind up to 32 km / h, which increases to 10 to 20 km / h in the afternoon. Chance of rain 40 percent.

feedback

Today: Mostly sunny in the morning with a few showers, then mostly cloudy with showers, probably in the afternoon. Highs from 82 to 88 near the shore to around 73 at 4000 feet. Southeast winds up to 10 km / h. Chance of rain 60 percent.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows of 65 to 72 near shore to about 54 to 4000 feet. Southwest winds up to 10 km / h. 50 percent chance of rain.

Wednesday: Partly sunny with a few showers. Highs from 81 to 87 near shore to about 72 at 4000 feet. In the afternoon a south wind blows at up to 16 km / h to the south-east. Chance of rain 40 percent.

Waikoloa

Today: Mostly sunny in the morning, then partly sunny with showers in the afternoon. Heights from 83 to 88 near shore to 69 to 76 over 4000 feet. Northwest winds up to 10 km / h. Chance of rain 60 percent.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows of 73 near shore to 53 to 60 over 4000 feet. In the evening the northwest wind blows up to 10 km / h and becomes light. 50 percent chance of rain.

Wednesday: Mostly sunny with a few showers in the morning, then partly sunny with a few showers in the afternoon. Heights from 83 to 88 near shore to 69 to 76 over 4000 feet. Northwest winds up to 10 km / h. Chance of rain 40 percent.

summary

A light wind pattern will persist through Wednesday, with showers developing over the interior of the island every afternoon and a few showers near the coast every night. More typical trade winds will return Thursday through Saturday, with showers favoring windward and mauka areas. Trade seems to be disrupted again from Sunday until the beginning of next week, with the sea breeze in the afternoon hours favoring the shower development over the interior of the island.

discussion

There is currently a slowly moving low pressure valley north of the central islands on the surface, which is responsible for the light and variable wind regime throughout the state this morning. Infrared satellite imagery shows clear to partly cloudy conditions in most areas, with more extensive cloud cover over some leeward stretches of the Big Island. Meanwhile, radar images show some showers near the island coasts, with most of the shower activity over the water. The main short-term concern revolves around the likelihood of rain in the next few days.
The low pressure in the north of the state will slowly move west over the next few days, disrupting the trade winds. As a result, light and changeable winds with sea breezes during the day and land breezes overnight should prevail until Wednesday. Trades are expected to slowly return late Wednesday on the eastern end of the state and across the rest of the island chain on Wednesday evening as the low pressure valley emerges in the west of the islands and high pressure builds up in the far northeast. Moderate trade winds should return from Thursday to Saturday, but trend downwards on Saturday. It seems increasingly likely that trade will be disrupted from Sunday to early next week as the remnants of tropical cyclone Linda roll by to the north of the island chain.
As for the rest of the weather details, there should be a convective shower regime until Wednesday. Rain showers will prefer places near the coast and at night, with scattered to numerous showers developing over the interior of the island every afternoon until the early evening hours. A more typical trade wind pattern should re-establish itself from Wednesday night to Saturday, with showers favoring the windward and mauka areas. A convective shower regime could develop again from Sunday to early next week as the remains of Linda roll by in the north of the islands.

aviation

A light wind regime will allow local land and sea breezes to dominate the wind pattern over each island through Wednesday. A disturbance to the upper level northeast of the Hawaiian Islands will keep the atmosphere fairly unstable through Wednesday.
Overnight until early morning, divergent land breezes will drive clouds and showers down the slope into the coastal waters. The sea breeze intensifies a few hours after sunrise and forms clouds over every island. Converging sea winds will create showers in the afternoon through early evening, favoring western slopes and inland stretches. Short periods of MVFR / IFR conditions over the western and inner portions of each island are likely in this pattern.
No AIRMETs in effect. Expect AIRMETs for Mountain Obscuration this afternoon.

marine

A surface trough passing north of the state for the next few days will disrupt the flow of trade … ultimately weakening and changing winds around the islands. The westerly movement of this trough will change from a light to a gentle breeze from east to southeast by early Wednesday. A more normal trade wind pattern will prevail from Wednesday night to Thursday as the trough moves northwest of the island chain.
The expected large, long south swell has arrived and will produce High Surf Advisory (HSA) surf (peaking 10 feet or more) along the south-facing coastlines by Wednesday. Southern buoys offshore confirm this high arrival of the south swell … 6 to 7 foot swells within the 17-19 second spectral bands. The offshore PacIOOS Barber’s Point buoy observes constant swell heights of 3 feet or more within the high 18-22 second spectral bands. The HSA will be in effect through Wednesday afternoon as the increased southern swell energy propels this south coast surfing event through mid-week.
The relatively low, moderate period from northwest to west will slowly recede by Tuesday. This will cause the north and west coast surf to gradually break through in the late afternoon. Surfing on the east-facing banks will remain small for the next few days. The swell within the small trapped swell of Hurricane Linda in the Eastern Pacific could reach the east-facing shores of the easternmost islands as a small, moderate east swell later this week.

HFO watches / warnings / notices

High Surf Advisory until Wednesday 6pm HST for Niihau, Kauai Leeward, Waianae Coast, Kahoolawe, Maui Leeward West, Kona, Kauai South, East Honolulu, Honolulu Metro, Ewa Plain, Molokai Southeast, Molokai Leeward South, Lanai Leeward, Lanai South , Maui Central Valley South, Kipahulu, South Maui / Upcountry, South Haleakala, Big Island South, Big Island Southeast.

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Data courtesy of NOAA.gov

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