Hawaii County climate forecast is Might 19, 2021

Hilo

Today: Showers likely, mostly before 1pm. Partly sunny, with a peak near 80. East winds 6 to 8 mph. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Occasional showers, mostly after 7pm. Low around 67. East wind around 8 km / h. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Thursday: Occasional showers, mostly before 1pm. High near 79. East winds around 9 mph. The probability of rainfall is 80%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers after noon. Increasing clouds, with a high near 79. Light and changeable wind from the northwest from 5 to 11 km / h. The probability of precipitation is 20%.

Tonight: A few showers, mostly before midnight. Mostly cloudy with a low of around 65. Light north-northwest wind. The probability of precipitation is 30%. New levels of precipitation between a tenth and a quarter of an inch are possible.

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Thursday: A few showers after noon. Increasing clouds, with a high near 80. Calm wind from west-northwest with about 10 km / h. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Waimea

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Today: a few showers. Partly sunny, with a peak near 73. East-northeast winds 11 to 23 km / h, with gusts of up to 30 km / h. The probability of precipitation is 40%. New amounts of precipitation between a quarter and a half inch are possible.

Tonight: A few showers. Mostly cloudy with a low of about 57. East winds about 11 mph. The probability of precipitation is 40%. New amounts of precipitation between a quarter and a half inch are possible.

Thursday: A few showers. Partly sunny with highs near 74. East-northeast winds 9-11 miles per hour. The probability of precipitation is 50%. New amounts of precipitation between a quarter and a half inch are possible.

Kohala

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Today: Showers likely, mainly after noon. Mostly cloudy, peaking near 65. Breezes, with easterly winds of 11 to 25 mph, with gusts of up to 35 mph. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Occasional showers. Low around 55. East-southeast winds around 11 mph. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Thursday: Showers likely, mostly before noon. Mostly cloudy, with a high near 66. East winds 8 to 11 mph. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: A few showers before noon. Mostly sunny, with a high near 81. Windy, with easterly winds of 21 to 23 mph, with gusts of up to 48 mph. The probability of precipitation is 20%.

Tonight: A few showers. Partly cloudy, with a minimum of about 71. Breeze, with an east-northeast wind at about 34 km / h, with gusts of up to 42 km / h. The probability of precipitation is 20%.

Thursday: single showers. Mostly sunny, with a high near 81. Windy, with an easterly wind around 35 km / h, with gusts of up to 45 km / h. The probability of precipitation is 20%.

Feedback

Today: Showers likely, mostly before noon. Mostly cloudy, with a high near 75. Northeasterly winds 10 to 21 km / h. The probability of precipitation is 70%. New amounts of precipitation between a quarter and a half inch are possible.

Tonight: Occasional showers. Low around 64. East-northeast winds 9 to 13 mph. The probability of precipitation is 80%. New amounts of precipitation between a quarter and a half inch are possible.

Thursday: Showers likely, mostly before noon. Mostly cloudy, with a peak near 74. East-northeast winds 10-23 km / h, with gusts up to 18 km / h. The probability of precipitation is 70%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Waikoloa

Today: Sunny, with a high near 81. North wind at 10 km / h.

Tonight: Mostly clear, with a low of about 65. East wind about 10 km / h.

Thursday: A few showers after noon. Sunny, with a high close to 83. Northeast wind at about 10 km / h turning north-northwest in the morning. The probability of precipitation is 20%.

Summary

The stormy trade winds will last until the weekend. Low clouds and showers will favor windward and mountainous areas, with minimal rainfall over most leeward locations. Lighter winds are expected over the weekend, which will bring increased humidity and a slight increase in showers.

discussion

Relatively friendly and slightly windy trade weather will prevail into the weekend, with lighter winds possibly leading to a few more showers over the weekend and early next week.
A seasonal trade wind weather regime will remain firmly entrenched over the islands this week, with severe settlement inversion between 8 and 10,000 feet covering the randomly dispersed pockets of moisture embedded in the trade wind stream. This moisture will bring brief showers to the windward parts of the islands and perhaps a drizzle to the leeward areas, although daytime heating supports stronger clouds and showers over the leeward Big Island each afternoon and evening.
The locally breezy trade winds are supported by a 1031 mb high surface elevation centered about 1500 miles northeast of the islands. The high will change little over the next few days as it drifts southeast, causing a small change in wind speed over the area.
The projections indicate that a sharp trough at altitude will develop over the islands over the weekend, possibly inducing the formation of a surface trough, while a front to the northwest will weaken the ridge. The combined effects will result in fewer winds turning southeast, which will likely result in more moisture over the islands. The atmospheric instability associated with the trough appears to be minimal, so only a slight increase in clouds and showers is expected, although afternoon sea breezes could potentially bring some leeward showers to the smaller islands. The bottom could continue early next week as the NW and N fronts block the islands and keep the wind on the lighter side.

aviation

The high pressure in the northeast of the state will continue to generate moderate to airy trades over the forecast period. Therefore, areas of tempo-wise turbulence are likely to be present in the slipstream of the island terrain. Isolated showers activities will favor windward areas with isolated showers elsewhere. By this morning, expect a slight increase in shower cover along the windward coasts and slopes. Some of the passing showers may have short-term MVFR caps and visibility ranges.
AIRMET Tango remains in effect due to tempo-wise turbulence below 8,000 feet above and south through west of all mountains.

marine

A surface height of 1030 mb far northeast of the islands will drift southeast in the evening. It is expected to drift southeast through Thursday before stalling over the weekend. The moderate to locally strong trade winds will continue until Friday. A Small Craft Advisory (SCA) applies to selected coastal waters of Maui County and the waters south of the Big Island through Thursday afternoon. The SCA is expected to be extended.
A front northwest of Kauai is expected to move from the northwest towards the islands over the weekend and early next week, while a ridge is expected to slope southward far north of the islands and east of the front. This will cause the trade winds to subside a level to moderate speed over the weekend. The back is weakening early next week as the front pushes further east. This will further weaken the trade winds and turn southeast over Kauai.
The surf will remain well below the recommended thresholds on all banks until next week. A small to moderate northwest swell will peak today, followed by a slow decline through Thursday night. Another small to moderate north-north-northwest pulse comes on Saturday night, peaking on Sunday and Sunday night, followed by a gradual decline through Monday. In the night of Tuesday and Thursday there are a number of small swells in the northwest.
A series of long waves from the south will keep the surf from flattening the south-facing shores until next week. The biggest pulse is scheduled for next Tuesday, followed by a gradual decline through Wednesday. The locally strong trade winds will maintain a small to moderate short-term surf for the rest of the week on the east-facing coasts and then slowly decrease together with the decreasing trade winds until the beginning of next week.

HFO clocks / warnings / notices Ad

Small Craft Advisory until Thursday 6:00 p.m. HST for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Data courtesy of NOAA.gov

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