Hawaii County climate forecast is September 05, 2021

Photo credit: James Grenz

Hilo

Today: Mostly cloudy. Showers probably in the morning, then scattered showers in the afternoon. Heights around 85 near shore to 70 to 75 at 4000 feet. East wind up to 10 km / h. Chance of rain 70 percent.

Tonight: Mostly cloudy with showers likely. Lows of about 67 near shore to about 53 at 4000 feet. Southeasterly winds up to 10 miles per hour turning southwest after midnight. Chance of rain 70 percent.

Labor Day: Mostly cloudy. Showers probably in the morning, then scattered showers in the afternoon. Heights around 85 near shore to 70 to 75 at 4000 feet. East wind up to 10 km / h. Chance of rain 70 percent.

Kona

Today: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Heights from 83 to 88 near shore to about 70 near 5000 feet. Southwest winds up to 10 km / h. 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 68 to 74 near shore to about 54 near 5000 feet. Breeze. Chance of rain 40 percent.

THE ARTICLE CONTINUES BELOW THE ADVERT

Labor Day: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Heights from 83 to 88 near shore to about 70 near 5000 feet. West winds up to 10 km / h. 50 percent chance of rain.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Partly sunny with a few showers. Heights from 83 near shore to 70 to 80 near 3000 feet. Northeast winds up to 15 miles per hour. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers. Lows of 67 near shore to 55 to 61 near 3000 feet. Southeast winds up to 10 km / h. 50 percent chance of rain.

Labor Day: Partly sunny with a few showers. Heights from 83 near shore to 70 to 80 near 3000 feet. East wind up to 15 km / h. 50 percent chance of rain.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Partly sunny with a few showers. Heights from 83 near shore to 70 to 80 near 3000 feet. Northeast winds up to 15 miles per hour. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers. Lows of 67 near shore to 55 to 61 near 3000 feet. Southeast winds up to 10 km / h. 50 percent chance of rain.

Labor Day: Partly sunny with a few showers. Heights from 83 near shore to 70 to 80 near 3000 feet. East wind up to 15 km / h. 50 percent chance of rain.

Southern big island

Today: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Altitudes around 87 near shore to 74 near 5000 feet. East wind up to 15 km / h. Chance of rain 40 percent.

Tonight: Partly cloudy. Isolated showers in the evening. Lows of about 69 near shore to about 52 near 5000 feet. Northeast winds up to 15 miles per hour. Chance of rain 20 percent.

Labor Day: Airy. Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Altitudes around 87 near shore to 74 near 5000 feet. East wind up to 20 km / h. Chance of rain 40 percent.

feedback

Today: Mostly cloudy. Showers probably in the morning, then scattered showers in the afternoon. Heights around 85 near shore to 70 to 75 at 4000 feet. East wind up to 10 km / h. Chance of rain 70 percent.

Tonight: Mostly cloudy with showers likely. Lows of about 67 near shore to about 53 at 4000 feet. Southeasterly winds up to 10 miles per hour turning southwest after midnight. Chance of rain 70 percent.

Labor Day: Mostly cloudy. Showers probably in the morning, then scattered showers in the afternoon. Heights around 85 near shore to 70 to 75 at 4000 feet. East wind up to 10 km / h. Chance of rain 70 percent.

Waikoloa

Today: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Altitudes from 87 near shore to 71 to 77 over 4000 feet. In the afternoon the north-east wind blows at up to 16 km / h on the north-west. Chance of rain 30 percent.

Tonight: In the evening mostly cloudy with a few showers, then partly cloudy after midnight. Lows of 69 to 74 near shore to 50 to 57 over 4000 feet. Breeze. Chance of rain 40 percent.

Labor Day: Mostly sunny in the morning, then partly sunny in the afternoon with a few showers. Altitudes from 87 near shore to 71 to 77 over 4000 feet. Northwest winds up to 10 km / h. Chance of rain 30 percent.

summary

Moderate trade winds will continue today, with showers favoring windward and mauka areas, although a disturbance at high altitude will allow some more showers to reach leeward areas as well. Trades will weaken into the easy to medium Labor Day range through Tuesday. Rain showers favor windward slopes and coasts during the night and in the early morning hours, with a few showers developing over the leeward and interior areas every afternoon. Moderate trades and more typical windward and mauka showers will return Tuesday night and last until next weekend.

discussion

Currently on the surface, a west-east high pressure ridge centered about 750 miles north of Honolulu is driving moderate trade winds over the island chain in the early morning. Infrared satellite images show predominantly cloudy conditions in many windward areas, with partially cloudy skies predominating in most of the lee areas. Scattered radar images point to numerous showers moving up windward slopes and coasts, with some of these showers spilling over into leeward communities. The top short-term concerns revolve around trade wind trends and the likelihood of rain for the next few days.
A high pressure ridge north of the islands will hold moderate trade winds in place today, with trips then trending to the light to moderate ranges on Labor Day and Tuesday when the ridge weakens. A new tall building north of the islands should increase trade slightly on Wednesday and Thursday before a weak low approaching from the east eases trading one more notch on Friday by next weekend.
As for the rest of the weather details, tonight will be pretty typical trade winds, with showers favoring windward and mauka areas. With low levels remaining on the upper level only in the northeast of the state, increased inversion heights will allow some more of these showers to penetrate leeward areas as well. A slightly lighter wind pattern Labor Day through Tuesday will have showers in the night and early morning hours, favoring windward and mauka areas. A more typical trade wind pattern is then expected from Tuesday night to the next weekend, with showers again favoring windward and mauka areas, especially at night and in the early morning hours, with an occasional shower from time to time reaching the communities in the lee.

aviation

Trade wind speeds gradually decrease as a surface ridge north of the islands near 32N continues to weaken. The 12z soundings and radar VAD wind profiles still show 20-25 kt, so AIRMET TANGO will remain in operation at least until the regular update to 1545z. Should at that point be able to drop it but then will make a final assessment.
A weak upper low in the northeast of the islands will intensify the incoming trade wind showers in the next few days. This will lead to intermittent episodes of MVFR and more likely MTN OBSC over windward and mauka sections (AIRMET SIERRA is now in effect for parts of the Big Island on windward). Some showers spread out in the lee from time to time, whereby short MVFR are possible there.

marine

A high pressure ridge north of the Hawaiian Islands will weaken by Friday as two frontal systems cross the North Pacific Basin from west to east. Trade wind speeds will decrease over the area through Friday as the ridge north of the islands remains in a weakened state. The Small Craft Advisory (SCA) was canceled this morning as the wind speed dropped below 25 knots. Conditions are likely to remain below SCA levels for all coastal waters through Friday.
A few medium to long-lasting south swells will keep the surf heights along the southern exposures near the seasonal normal level until tonight, with slightly lower surf heights forecast Monday through Wednesday.
Surf heights along the northeast and east coasts will tend to be lower by early next week as trade wind speeds decrease and wave heights decrease across the region. No significant swells from north or west are expected until Saturday.

HFO watches / warnings / notices

None.

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Data courtesy of NOAA.gov

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