Hawaii County climate forecast is Could 25, 2021

Photo credit: James Grenz

Hilo

Today: 40 percent chance of rain, especially after noon. Increasing cloudiness, peaking near 80. Southwest winds 5 to 11 miles per hour turning east in the morning. New rainfall levels of less than a tenth of an inch possible.

Tonight: A 40 percent chance of showers. Mostly cloudy, with a low of about 66. East-southeast wind with about 10 km / h, which turns from west-southwest in the evening. New rainfall levels of less than a tenth of an inch possible.

Wednesday: 40 percent chance of rain, mainly before noon. Mostly cloudy with a high of near 83. Light and changeable winds from the east at 6-11 mph. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A 20 percent chance of showering after noon. Increasing clouds, peaking near 77. Calm wind blowing from the west at 5 to 8 miles per hour in the afternoon.

Tonight: A 20 percent chance of a shower before midnight. Cloudy, then gradually cloudy, with a low point around the 64th north-northwest winds 5 to 8 mph, calming down after midnight.

THE ARTICLE CONTINUES BELOW THE ADVERT

Wednesday: A few showers after noon. Partly sunny with highs near 80. Calm winds from the west at 5 to 11 miles per hour. The probability of precipitation is 20%.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: 40 percent chance of showering after noon. Increasing clouds, with a peak near 73. Northeast wind at 10 km / h becomes calm in the afternoon. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: A 40 percent chance of showers, mostly before midnight. Cloudy, then gradually cloudy, with a low of around 53. Light northeast winds increasing to 8 to 21 mph in the evening. New rainfall levels of less than a tenth of an inch possible.

Wednesday: A 20 percent chance of showers. Partly sunny, peaking near 76. Breezes, with northeasterly winds of 8 to 25 mph, with gusts of up to 35 mph.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: A 40 percent chance of showers after 1 p.m. Increasing clouds, peaking near 59. Calm wind blowing from east-southeast at 5 to 8 miles per hour in the afternoon. New rainfall levels of less than a tenth of an inch possible.

Tonight: A 40 percent chance of showers, mostly before 1am. Mostly cloudy, with a low of about 51. East winds about 8 mph. New rainfall of less than a tenth of an inch possible.

Wednesday: A 20 percent chance of showers. Partly sunny with a high near 62. East winds 5 to 10 mph turning weak from the southeast in the afternoon.

Southern big island

Today: A 20 percent chance of showers. Mostly sunny, with a high near 81. Windy, with an easterly wind around 18 mph, with gusts of up to 23 mph.

Tonight: A 20 percent chance of showers before 8 p.m. Partly cloudy, with a minimum of about 72. Windy, with easterly winds of 16 to 28 mph, with gusts of up to 37 mph.

Wednesday: Mostly sunny, with a high near 81. Windy, with easterly winds of 14 to 21 mph, with gusts of up to 42 mph.

Feedback

Today: A 50 percent chance of showers, mostly after noon. Partly sunny with a high near 77. Light and changeable wind blowing between 8 and 21 miles per hour from the east in the mornings. New rainfall levels of less than a tenth of an inch possible.

Tonight: A 50 percent chance of showers. Mostly cloudy with a low of about 63. East winds 5 to 11 mph will be light and variable. New levels of precipitation between a tenth and a quarter of an inch are possible.

Wednesday: A 50 percent chance of showers. Mostly cloudy with a high near 80. West-northwest winds 5 to 13 mph coming in from the east-northeast in the morning. New rainfall levels of less than a tenth of an inch possible.

Waikoloa

Today: 30 percent chance of a shower after noon. Increasing clouds, with a high near 80. Light and changeable wind blowing 6-11 miles per hour from west-northwest. New rainfall levels of less than a tenth of an inch possible.

Tonight: A 30 percent chance of showers before 8 p.m. Cloudy in the early evening, then clearer, with a low of about 65. Light and changeable winds blowing 5 to 16 miles per hour from the east after midnight. New rainfall levels of less than a tenth of an inch possible.

Wednesday: Mostly sunny, peaking near 83. East winds 5 to 10 miles per hour that become light and changeable in the afternoon.

Summary

A low pressure system north of the state will keep light and variable winds in the forecast today. Light, widespread winds enable local land and sea breezes to develop. Sea breezes will form clouds over the interior of the island, with some showers developing in the afternoon to early evening hours. Overnight, land breezes will tend to clear the cloud cover as rain activity decreases. Light to moderate trade winds will return Wednesday through Friday with sustained modified sea breezes over some leeward slopes. Trade winds will decrease again on the holiday weekend with drier trends by Memorial Day.

discussion

This morning’s satellite imagery continues to show a low pressure system and cold front breaking the high pressure ridge north of the state. A weakened ridge on the surface will keep light and changeable winds in the forecast today. Lighter, widespread winds will keep the Hawaiian Islands in a pattern of land and sea breezes for another day. Radar images show a fairly stable pattern with land breezes suppressing clouds and showers over most of the islands. Some convergent shower tapes linger over some of the coastal waters.
The afternoon sea breezes create convergent winds that blow from the ocean to the inner sections of the island. These convergent winds along with island warming during the day will create clouds over each island. The clouds will lose their warming and surface wind convergence in the afternoon to early evening hours, and some showers may appear, favoring these island mountains and inland areas. Isolated thunderstorms can occur over the higher elevations of the Big Island in the afternoon.
On Wednesday, the low pressure system north of the islands will weaken and form a truncated low in the northeast of the state. The ridge will build up over the region and be strong enough to generate light to moderate trade winds. The upper level low keeps the subsidence inversion heights elevated to the 7,000 to 8,000 foot elevation, creating a small instability for the transient shower activity. Clouds and passing showers shift towards windward and mountain areas. However, afternoon sea breezes are likely to linger over the western slopes of each island, and the convergence between the weak trade winds and sea breezes can lead to late afternoon shower activity in some leeward locations. This weak trade wind weather pattern will continue through Friday.
From Saturday to Memorial Day, another cold front system will move into the Central Pacific Basin from Friday to Saturday. This low pressure system will weaken the high pressure ridges north of the islands. Weak trade winds will return a light and variable land and sea wind weather pattern that will persist over the holiday weekend. During this time, clouds and some showers will develop over the interior of the island. For Memorial Day, drier and more stable conditions are forecast as the surface ridge axis moves across the state.

aviation

Land breezes mostly support clear skies and prevailing VFR throughout the region this morning. This afternoon, the sea breezes will again favor an expansion of the cloud cover in the afternoon and a few showers inland. Occasional thunder is possible over the slopes of the Big Island during peak heat.
No AIRMETs in effect.

marine

A weak border running through the northwestern offshore waters will be stuck north of the islands as a trough today. This has weakened the sea breezes around Kauai and Oahu to gentle northeast winds, while turning gentle to moderate voyages further east-southeast across the luffing waters of the eastern island. Since the weak trough was flushing out north of the islands by Wednesday, the high pressure will build up again far in the northeast of the state. This tighter pressure gradient back to the islands will result in more widespread moderate trades across the chain in the second half of the week.
A small north-north-northwest swell that bumped north and west yesterday will fade as the morning progresses. The next small northwest swell is expected to intensify north and west bank surf Wednesday night through Friday. While confidence is still a bit low this far out, the arrival of a larger northwest swell on Memorial Day Weekend on Sunday could greatly stimulate Memorial Day surf along many northern and western exposures. A series of small, long swells from southwest to south originating from the southern hemisphere are arriving and will continue through Friday. These swells will raise surfing heights slightly to seasonal levels during the week. Trade winds upstream of the islands create moderate surf along the east-facing coasts despite the relatively weak trade winds around the islands. That increased surf on the east coast will fade into the second half of the week.
Highest monthly astronomical tides, along with water levels up to a third of a foot above normal, will result in bothersome coastal flooding in the late afternoon or early evening during this week’s high tide. All of the effects of flooding will be the inundation of the normally dry beaches and coastal infrastructure.

HFO clocks / warnings / notices Ad

None.

Data courtesy of NOAA.gov

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