Hawaii County climate forecast is Could 23, 2021

Hilo

Today: Showers likely, mostly before 1pm. Mostly cloudy with a high near 83. South winds 5 to 9 miles per hour turning east in the morning. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy, with a minimum of about 66. East-southeast wind with about 8 km / h, which turns south after midnight. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Monday: A few showers. Mostly cloudy, peaking near 82. Light and changeable winds blowing from east-southeast at 5 to 9 miles per hour in the afternoon. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers, especially after 1 p.m. Increasing clouds, with a peak near 79. Calm wind blowing at about 8 km / h from west-southwest in the afternoon. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers, mostly before 7pm. Mostly cloudy, with a low of around 64. Light and changeable wind. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

THE ARTICLE CONTINUES BELOW THE ADVERT

Monday: A few showers, mostly after 7 a.m. Mostly cloudy, with a peak near 79. In the afternoon a calm wind blows from the west at a speed of about 10 km / h. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: a few showers. Increasing clouds, with a peak near 75. West winds around 10 km / h calm down in the afternoon. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy, with a low of 53. Light and changeable wind. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Monday: A few showers, mainly after noon. Mostly cloudy, with a peak near 75. Calm wind from west-northwest with about 8 km / h. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Showers likely, mostly before noon. Mostly cloudy, with a high near 61. Light and changeable wind. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Partly cloudy, with a low of around 51. Light and changeable wind. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Monday: A few showers. Mostly cloudy, with a peak near 61. In the afternoon a calm wind blows at about 8 km / h from the east. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: a few showers. Partly sunny, with a high near 81. Windy, with an easterly wind of 14 to 28 mph, with gusts of up to 37 mph. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy with a minimum of about 71. Breezes, with east-northeast winds of 15 to 27 mph, with gusts of up to 35 mph. The probability of precipitation is 20%.

Monday: A few showers, mainly after noon. Partly sunny, with a high near 81. Windy, with easterly winds around 25 mph, with gusts up to 34 mph. The probability of precipitation is 30%.

Feedback

Today: Showers likely, mostly before noon. Mostly cloudy with a high near 80. South-southeast winds 5 to 9 mph turning east in the afternoon. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy, with a low of about 63. East wind with about 10 km / h becomes calm in the evening. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Monday: A few showers. Mostly cloudy, peaking near 79. Light southeast winds turning southeast at 6-11 mph in the morning. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Waikoloa

Today: A few showers, especially after noon. Increasing clouds, peaking near 82. West-northwest winds 5 to 8 mph becoming calm in the afternoon. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy, with a low of around 65. Light and changeable wind. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Monday: A few showers after noon. Partly sunny, with a peak near 82. West-northwest winds 5 to 9 mph that become calm in the afternoon. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Summary

The trade winds will continue to tend to be light and variable over the smaller islands until this afternoon and will last until Tuesday. This is in response to a front that comes to a standstill and dissolves north-west of the islands Monday evening through Tuesday. Also expect an increase in humidity in the light winds. The cooling trade winds will return on Wednesday and last until the rest of the next week.

discussion

For today until Tuesday night the wind changes. The ECMWF and high resolution models have shown that a light easterly background wind will persist through Tuesday night today, most noticeably over the upwind waters west of Maui. A slightly stronger southeast wind is expected to set in over the windward waters of Maui and upwind of the Big Island later today and last until Tuesday night. This creates a hybrid mix of trade and land and sea breezes over land. The trades will continue to bring some showers to the windward areas day and night as the land and sea breezes cover the rest of each island. Daytime heat and light wind encourage a daytime breeze from the sea. and with abundant moisture there may be occasional showers over the interior and empty areas every afternoon through Tuesday. At night, a land breeze drives most of the showers off the island or to the coast.
The intensity of these showers is currently uncertain, but the models suggest the air mass will become unstable on Monday and will last through Tuesday. The EC solution also has an upper shortwave trough that can sink on the islands Monday night and Tuesday, adding to the showers and increasing the chance of an afternoon thunderstorm for the Big Island peaks. The weather on Sunday looks good. Some spotty afternoon showers are expected over indoor and void areas. An exciting trough on the upper level above the Big Island will favor a thunderstorm or two over the higher elevations of the Big Island.
The Koolau and windward Oahu, mainly the Kahana and Punaluu areas, had a wet evening with just over an inch of rain. Occasional showers continue and are closely monitored. Occasional showers are also present on Kauai to windward, southeast Maui, and the Big Island to windward.
Cool trade winds will return on Wednesday and intensify to locally strong Thursday night or Friday.

aviation

A low pressure system moving north of the region will weaken the ridge north of the islands and create a light and variable wind regime. At 19Z a sea breeze begins to develop, with clouds forming over the interior of the island, along with a few showers that favor the afternoon to early evening hours. After sunset, land breezes with decreasing cloud cover form for most of the islands in the night hours. This light and variable wind pattern will last until Tuesday.
AIRMET Sierra in effect for Tempo Mountain Obscurations over the northern and eastern sections of Oahu and Kauai. These low cloud cover will likely decrease later in the morning.
Light icing is possible between 130 and 160 this morning near the Big Island.

marine

A front approaching the region from the northwest will weaken the background current today and shift it from the east-southeast. These light east-southeast winds are likely to continue through tonight through Tuesday as the front eventually grinds to a halt and weakens northwest of the area. By the middle of the week, high pressure should gradually build up north-east of the islands. This will allow moderate trade winds to return to the state from Wednesday through early Thursday. Looking ahead, trade winds are expected to approach the Small Craft Advisory criteria starting Thursday night or Friday in the normally windier waters off the islands of Maui County and Big Island.
Expect only a small background surf along the south-facing coasts today. A series of small, long-lasting south-southwest and south swells, expected to begin spreading across the area from Monday, will likely cause surf heights to rise slightly above seasonal levels from Tuesday to Friday. Surf heights are expected to drop to near-seasonal levels by next weekend as the swells from the southern hemisphere gradually decrease.
A small north-northwest swell is expected later today and will peak on Monday. This swell is likely to increase surfing heights slightly along most of the north and west coasts before gradually subsiding on Tuesday. Another small northwest swell is expected to increase surf depths along most of the north and west facing coasts of the smaller islands from Wednesday night through Friday.
Despite the weaker trade wind regime, an increase in moderate trade winds immediately upstream of the islands will likely keep a low level of background surf along the east-facing coast until mid-week.

HFO watches / warnings / notices

None.

Data courtesy of NOAA.gov

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