Hawaii County climate forecast for September 14, 2021

Photo credit: James Grenz

Hilo

Today: Mostly cloudy with a few showers. Heights from 78 to 84 near the shore at 63 to 70 at 4000 feet. Northeast winds up to 10 miles per hour. 50 percent chance of rain.

Tonight: Cloudy with showers. Lows of 64 to 72 near shore to about 56 to 4000 feet. Breeze. Chance of rain 90 percent.

Wednesday: Cloudy with numerous showers. Heights 79 to 85 near shore to 65 to 71 at 4000 feet. Southeasterly winds around 10 mph. Chance of rain 70 percent.

Kona

Today: Mostly sunny in the morning, then mostly cloudy with a few showers in the afternoon. Highs from 84 to 89 near shore to about 67 near 5000 feet. Breeze. 50 percent chance of rain.

Tonight: In the evening mostly cloudy, then partly cloudy. Isolated rain showers. Lows of 70 to 75 near shore to 51 to 56 near 5000 feet. Breeze. 50 percent chance of rain.

THE ARTICLE CONTINUES BELOW THE ADVERT

Wednesday: Mostly sunny in the mornings, then partly sunny. Isolated rain showers. Highs from about 86 near shore to about 68 near 5000 feet. In the afternoon light winds from the southwest will blow up to 10 miles per hour. 50 percent chance of rain.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Partly sunny with a few showers. Maximum values ​​64 to 84. East winds up to 24 km / h. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers. Lows of 63 to 71 near shore to 57 to 64 near 3000 feet. East wind up to 10 km / h. 50 percent chance of rain.

Wednesday: Mostly cloudy. Numerous showers in the morning, then isolated showers in the afternoon. Altitudes 66 to 85. East winds up to 10 miles per hour. Chance of rain 70 percent.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Partly sunny with a few showers. Maximum values ​​64 to 84. East winds up to 24 km / h. 50 percent chance of rain.

Tonight: Mostly cloudy with a few showers. Lows of 63 to 71 near shore to 57 to 64 near 3000 feet. East wind up to 10 km / h. 50 percent chance of rain.

Wednesday: Mostly cloudy. Numerous showers in the morning, then isolated showers in the afternoon. Altitudes 66 to 85. East winds up to 10 miles per hour. Chance of rain 70 percent.

Southern big island

Today: Sunny in the morning, then mostly cloudy. Isolated showers. Highs from 84 near shore to about 65 near 5000 feet. East wind up to 15 km / h. Chance of rain 20 percent.

Tonight: Partly cloudy with a few showers. Lows of 74 near shore to about 53 near 5000 feet. Northeast winds up to 15 miles per hour. Chance of rain 30 percent.

Wednesday: Partly sunny with a few showers. Heights from 85 near shore to 67 near 5000 feet. East winds 10 to 15 miles per hour. Chance of rain 40 percent.

feedback

Today: Mostly cloudy with a few showers. Heights from 78 to 84 near the shore at 63 to 70 at 4000 feet. Northeast winds up to 10 miles per hour. 50 percent chance of rain.

Tonight: Cloudy with showers. Lows of 64 to 72 near shore to about 56 to 4000 feet. Breeze. Chance of rain 90 percent.

Wednesday: Cloudy with numerous showers. Heights 79 to 85 near shore to 65 to 71 at 4000 feet. Southeasterly winds around 10 mph. Chance of rain 70 percent.

Waikoloa

Today: Sunny in the morning, then partly sunny. Isolated showers. Heights from 83 to 90 near shore to 66 to 72 over 4000 feet. North winds up to 10 km / h. Chance of rain 20 percent.

Tonight: Partly cloudy with a few showers. Lows of 74 near shore to 50 to 56 over 4000 feet. In the evening the east wind blows up to 10 mph and becomes light. Chance of rain 20 percent.

Wednesday: Mostly sunny. Isolated showers in the morning, then isolated showers in the afternoon. Heights from 85 to 90 near shore to 67 to 73 over 4000 feet. Breeze. 50 percent chance of rain.

summary

An upper low in the northeast of the islands will slowly drift from west to southwest over the course of the week and weaken the trade winds from tonight until early Thursday morning. Local sea breezes can develop over sheltered western slopes every afternoon through Wednesday. The instability associated with the upper low will result in shower periods on Wednesday and Thursday and the potential for locally heavy rainfall. From Friday the weather should be drier again, as the trade winds are getting stronger in the entire region.

discussion

This morning’s satellite water vapor imagery shows that the unstable upper low continues to slowly drift west and lies approximately 600 miles north-northeast of Oahu. Isolated to isolated thunderstorms develop in the cold core center of the deep. The instability around this low creates rather unstable clouds throughout the region and showers develop as these clouds drift onto each island with the trade winds.
The broad instability associated with this low and a weaker high pressure ridge north of the islands will keep the trade wind temperature inversion in the 7,000-10,000-foot range for the next few days. Cumulus cloud heights will rise to the inversion level, with lower clouds maintaining periods of heavy showers in the forecast through Thursday.
For today, moderate trade wind speeds are beginning to weaken, with local land and sea breezes forming along the protected western slopes of Kauai and Oahu. A wind convergence between the afternoon sea breezes and the lighter trade winds can cause showers to develop over the lee areas in the afternoon. This light to moderate trade wind pattern with local land and sea breezes will last through Wednesday.
On the night of Wednesday and Wednesday, the upper low will drift west and pass north of the Hawaiian Islands, with the potential for some heavy showers in some locations. Expect slower shower bands with lighter trade winds. Isolated thunderstorms are possible over the higher elevations of the Big Island until Wednesday afternoon. The chances of heavy local showers remain for all islands until Thursday.
Thursday will be a transition day as the low point moves away from the state and high pressure builds north of the island chain. Showers are still expected as the breezy trade winds fill up from east to west. The shower cover will decrease somewhat over the eastern islands as more stable trade winds move into the eastern half of the state.
Until Friday, the trade winds will intensify throughout the region with drier weather trends in the forecast. Expect a more typical windward and mountain shower pattern that favors the night through early morning through Monday.

aviation

High pressure in the northeast of the state will enable sustained moderate trade across the island chain today. Therefore, the highest concentration of showers is likely to be confined to the windward coasts and slopes. Isolated activity expected elsewhere.
Some of the heaviest showers can produce short periods of MVFR caps and visibility.
No AIRMETs are currently in force.

marine

High pressure in the north of the state will keep moderate to fresh trade winds in place today. Trades will ease briefly tonight and Wednesday as a surface trough slides past in the north of the islands. As this trough exits the northwest of the state Wednesday night and Thursday, cruises will gradually rise back to locally strong levels, with winds hitting the Small Craft Advisory (SCA) thresholds over the typically windy waters of Maui and the Big Island by Thursday. The strong SCA-level trades Friday and Saturday are expected to expand to most, if not all, waters before dropping a notch on Sunday through early next week.
A series of long south and southwest swells will keep the surf along the south-facing banks near to slightly above the September average through Thursday. The surf on the south coast will then gradually subside over the weekend until the beginning of next week. On the north-facing shores, there will be small surf for most of the week, with a small wave from a north-west swell being possible this weekend. The surf on the east coast will remain well below normal until Wednesday. As the trade winds pick up Thursday through Saturday, the surf along the east facing coast gets rough and rises to near-seasonal levels before gradually decreasing from Sunday to early next week.

HFO watches / warnings / notices

None.

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Data courtesy of NOAA.gov

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