Hawaii County climate forecast is April 15, 2021

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Photo credit: James Grenz

Hilo

Today: a few showers. Mostly sunny, with a high near 77. Light and changeable wind blowing 5 to 8 miles per hour from the northeast in the afternoon. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy with a low of about 63. North winds 5 to 9 mph that become light and changeable after midnight. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Friday: A few showers. Partly sunny with a high near 77. Light and changeable wind blowing 5 to 11 miles per hour from the east in the afternoon. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: Increasing cloudiness, peaking near 79. East winds 5 to 11 miles per hour turning west-southwest in the afternoon.

Tonight: A few showers, mostly after midnight. Partly cloudy, with a low of about 61. Calm wind that blows about 8 km / h north-northwest after midnight. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

THE ARTICLE CONTINUES BELOW THE ADVERT

Friday: A few showers after noon. Sunny, with a high near 79. West-northwest winds 3-11 mph. The chance of rainfall is 20%.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: A few showers before noon. Mostly sunny, peaking near 74. Breezes, with northeasterly winds of 9 to 25 mph, with gusts of up to 37 mph. The probability of precipitation is 20%.

Tonight: A few showers, mostly after midnight. Partly cloudy, with a low of about 52. A northeasterly wind of about 10 km / h becomes calm in the evening. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Friday: single showers. Mostly sunny, with a peak near 74. Calm wind with a speed of about 8 km / h from the northwest. The probability of precipitation is 20%.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: a few showers. Mostly sunny, peaking near 70th breeze, with east-northeast winds of 13-18 mph, turning slightly east in the afternoon. Gusts of wind could reach up to 40 km / h. 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 low of about 45. Northeasterly winds 5 to 11 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Friday: A few showers, mainly after noon. Partly sunny, with a peak near 70. Northeast wind around 8 km / h becomes calm in the morning. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: A few showers after noon. Sunny, with a top speed of 75. Windy, with an easterly wind of 16 to 20 miles per hour, with gusts of up to 40 miles per hour. The probability of precipitation is 10%.

Tonight: A few showers after midnight. Partly cloudy, with a low of about 70. East-northeast winds 7 to 10 mph. The probability of precipitation is 20%.

Friday: Sunny, with highs near 75. East-northeast winds 5 to 10 mph becoming weak in the morning.

Feedback

Today: a few showers. Mostly sunny, peaking near 76. Northwest winds at about 8 mph turning northeast in the morning. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy, with a low of about 61. North-northwest winds 5 to 10 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Friday: A few showers. Partly sunny, with a peak near 76. East wind at 10 km / h becomes light and variable in the afternoon. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Waikoloa

Today: A few showers after noon. Sunny, with highs close to 80. Windy, with east-southeast winds of 7-25 miles per hour turning west-northwest in the morning. Gusts of wind can reach up to 23 miles per hour. The probability of precipitation is 20%.

Tonight: Sure, with a low of about 61. Northeast wind 3 to 10 km / h.

Friday: Sunny, with a peak near 80. Light and changeable wind with a speed of 10 km / h from the northwest.

Summary

A surface depression and valley to the east and northeast of the Big Island is sustained to this day by moderate to locally strong northeast winds across the area. The trades will weaken to light to moderate tonight and will last through the weekend. A front that is dissolving will strengthen the windward and mauka showers at the weekend. A more typical east-northeast trade wind returns on Saturday night, at which point the temperatures will no longer be so cool. Humidity will increase early next week when southeast winds gain the upper hand.

discussion

A northeasterly trade wind ensures cool temperatures, especially at night, until Saturday. This wind current is caused by a slowly moving surface depressions and valleys about 1000 miles northeast of Oahu and a wide surface high in northwestern Kauai. The northeast current will weaken from moderate to locally strong to light to moderate tonight and Friday.
As this trough is ejecting northeast tonight, a new surface depression is forming on Friday 500 miles west along 150W, causing our light to moderate northeast winds to turn further north. This new low will be ejected northeast on Saturday, followed by a weak surface high on Saturday night, causing the return of a more typical east-northeast trade. Between Sunday night and Monday the Passat gives way to a light southeast wind. Under this wind regime, the weather pattern changes from cruises to convective sea breezes during the day and afternoon showers and nocturnal land wind.
A front is expected to reach Kauai on Friday morning and on to Oahu in the afternoon. The front stands still and disperses across Maui County on Saturday. When the trade winds return to their usual east-northeast component on Saturday evening, the trade winds will return to all of the islands.
The windward and mountain sections of most of the islands experience mostly light showers. The lee areas of the smaller islands also feel a few drops from time to time. We anticipate that the frequency of these showers will decrease by late morning and be isolated by this afternoon. Isolated showers increase again after sunset.

aviation

Moderate trade winds will last until this morning, allowing the occasional shower to hit mainly the windward coasts and slopes. Short periods of MVFR caps and visibility can be associated with this activity. Otherwise, partly cloudy skies and VFR conditions for the leeward locations are to be expected.
No AIRMETS are currently in force and none are expected today.

marine

A low pressure valley east of the Big Island and a broad surface high pressure northwest of the state have maintained moderate and fresh trade winds from the northeast to this day. Last night’s ASCAT satellite pass confirmed local strong winds through the Alenuihaha Channel and the waters south of the Big Island. So we’ve extended the Small Craft Advisory for the windier waters of Maui County and south of the Big Island to 6:00 p.m. HST tonight. Trade will ease tonight and well into Friday in response to the northeast trough moving further away from the islands and a new low north-northeast of the islands developing. A weakening front will hit northern offshore waters this afternoon. The front will disintegrate when it hits Maui County on Saturday. Behind this front follows a new surface high on Saturday night, which initiates a light to moderate east-northeast trade wind. This wind direction changes on Sunday night and Monday in a more easterly to southeasterly direction. In the beginning to the middle of the week the winds become light and variable as the high pressure ridge of the surface aligns from west to east north of the islands.
The surf will remain low along the north and west coasts through Thursday. A series of moderate, short-term north swells will fill up from Friday and last through the weekend. This will increase surf along the north facing coasts over the weekend, with a slow decline expected early next week. The surf from these northern swells will stay well below the high surf recommendations. The east-facing bank surf will remain small until Thursday. The north swell can wrap itself in some easterly exposures, providing a small hump in the east facing coastal wave weekend surf. With any remaining south-southwest swells subsiding by Thursday, the south-facing bank surf will remain small into early Friday. Distant, long-lasting swell energy from the southern hemisphere arriving in a few days will give the southern shoreline a little boost from Friday through the weekend.

HFO clocks / warnings / notices Ad

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

Data courtesy of NOAA.gov

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