Hawaii County Climate Forecast is April 30, 2021

Hilo

Today: Showers likely, mostly before 1pm. Cloudy, with a high near 83. Calm wind blowing from 5 to 9 mph in the afternoon from the east. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely, mostly after 7pm. Cloudy, with a low of about 64. Light and changeable wind from the southwest with about 8 km / h. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Saturday: Showers likely, mostly before 1pm. Cloudy with a high near 84. Calm wind blowing at 5 to 8 miles an hour from the east in the afternoon. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers after noon. Partly sunny, with a high near 82. Calm winds from the west at speeds of 5 to 9 miles per hour. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers before midnight. Mostly cloudy, with a low of about 63. Calm wind that blows about 8 km / h from east-southeast after midnight. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

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Saturday: A few showers after noon. Partly sunny, with a high near 82. West winds 5 to 9 mph will be calm in the afternoon. 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, mostly before 1 p.m. Mostly cloudy with a high near 75. Windy, with northeasterly winds of 15 to 23 mph, with gusts of up to 32 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers, mostly after 7pm. Mostly cloudy, with a minimum of about 50. Windy, with northeasterly winds of 18 to 23 mph, with gusts of up to 32 mph. The probability of precipitation is 40%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Saturday: A few showers, mostly before 1 p.m. Mostly cloudy with a high near 76. Windy, with northeasterly winds of 17 to 24 mph, with gusts of up to 54 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Kohala

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Today: Frequent showers, mostly before noon. High near 67. Windy, with east-northeast winds of 21 to 24 mph, with gusts of up to 54 mph. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Frequent showering. Low around 40. Very windy, with an easterly wind of 24 to 45 km / h increasing to 33 to 38 km / h. Gusts of wind can reach up to 55 miles per hour. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Saturday: Frequent showers, mostly before noon. High near 70. Windy, with an easterly wind of 21 to 25 mph, with gusts of up to 36 mph. The probability of precipitation is 80%. 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 83. Windy, with easterly winds of 18 to 23 mph, with gusts of up to 48 mph. The probability of precipitation is 30%.

Tonight: A few showers after midnight. Partly cloudy, with a low of about 69. Windy, with easterly winds 23 to 42 km / h, with gusts up to 54 km / h. The probability of precipitation is 30%.

Saturday: A few showers before noon. Mostly sunny, with a high near 83. Windy, with easterly winds of 24 to 45 mph, with gusts of up to 60 mph. The probability of precipitation is 30%.

Feedback

Today: Frequent showers, mostly before noon. High near 82nd west-northwest winds 5 to 13 mph turning east-northeast in the afternoon. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Frequent showering. Low around 61. East-northeast winds 5 to 10 mph will be light and variable. The probability of precipitation is 80%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Saturday: Frequent showers, mostly before noon. High near 82. Northwest winds 6 to 10 mph blowing from the northeast in the morning. The probability of precipitation is 80%. New rainfall levels of less than a tenth of an inch possible.

Waikoloa

Today: Mostly sunny, with a peak near 80. East-southeast winds 8 to 11 mph, coming in from the north in the morning.

Tonight: Mostly clear, with a low of about 61. Windy, with a north-northeast wind of 7 to 25 miles per hour turning east-southeast in the evening. Gusts of wind can reach up to 21 km / h.

Saturday: Mostly sunny, peaking near 81st breezes, with east-northeast winds of 16 to 21 mph, getting light in the afternoon. Gusts of wind can reach up to 29 km / h.

Summary

Moderate northeast trade winds will shift from the east and become airy later on the weekend as high pressure builds up in the north. The persistent moisture in the region combined with the trade winds will bundle clouds and showers over windward and mountain locations during the weekend, especially during the night and early morning periods. Trade winds may decrease early next week and shift from the east-southeast as a front and upper fault approaches from the northwest. A modest rise in humidity off this front will increase the likelihood of precipitation early next week.

discussion

A residual moisture band connected to a dissipated front over the eastern end of the state will move as a trough to the west today through Saturday. The moderate northeast trade winds will alternate from the east and become breezy through the weekend this afternoon as it penetrates west. This moisture axis (satellite derived PWs up to about 1.5 inches) in combination with the trades will support the coverage of windward and mountain showers, with the best chances at night and in the early morning. However, a top ridge and plenty of dry, mid-altitude air should limit buildup. The guidance shows drier air filling from east to west behind the weak valley from Saturday to Sunday, with breezy eastern passages predominating.
Although forecast confidence is starting to be lower due to some differences in forecasts, trade winds should be trending down and possibly shifting from east-southeast Sunday night to early next week as a shortwave valley digs into the region to the southeast. Back weakness is expected when the accompanying cold front approaches from the northwest. If this develops as projected, a lot of moisture collecting northward in the islands in front of the frontline, combined with light winds and falling heights, will increase the chance of precipitation. The high angle of the sun entering the month of May, combined with this scenario, could result in a decent afternoon shower over the leeward and interior locations Monday through Tuesday.
Large model differences are shown by mid-week with the JRC hanging the frontal border to the west of the area and the European solution being that it moves to the islands, falters and dissolves when the trades return.

aviation

Despite a brief interruption in coverage that evening, clouds and showers increased again over Maui County overnight. Therefore, AIRMET Sierra was issued this morning for Maui and Molokai for the Tempo mountain darkening and will probably have to be extended to Oahu as well as a residual moisture band to the northwest.
Light to moderate trade winds are getting more easterly and predominate all day today before they get a little stronger tonight and go into the weekend. This will allow for the next few days showers and isolated MVFR conditions to favor mainly north-east facing slopes and coasts of the islands, particularly during the night and early morning periods.

marine

High pressure northeast of the islands, creating a worsening pressure gradient towards the state, has enabled the trade winds to return. Today’s journeys to the east will be moderate to locally strong across the board, with the winds staying at these levels until the weekend. For the windier waters around Maui County and south of the Big Island, a Small Craft Advisory (SCA) will likely be required tonight or early Saturday. The combination of strong cruises and an incoming higher northwest swell will create rough weekend seas over many windward areas and island channels. Winds may ease early next week and turn further southeast as an approaching front from the northwest weakens the ridge over the islands.
The surf runs along the north and west facing coasts as a mix of medium-term, north-northwest and longer-term, west-northwest swells that move around the islands. The north-north-northwest swell should last throughout the day before subsiding into the weekend. The long-lasting west-northwest swell will fill in today and will peak early Saturday near the high surf advisory levels along the northern and western exposed shorelines of smaller islands. Surfing along the south-facing banks will continue throughout the day while the final long period, south-southwest swell, will prevail. This swell will slowly fade over the weekend, with mainly southern swell energy in the background sustaining small surf on the south coast early next week. The east-facing bank surf will remain low until the afternoon. There will be a slight surge in surf on the east coast as increased trades drive a swell of wind waves. A downtrend in East Surf is expected next week as trades weaken.

HFO clocks / warnings / notices Ad

None.

Data courtesy of NOAA.gov

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