Hawaii County climate forecast is Could 20, 2021

Hilo

Today: a few showers. Partly sunny, with a high close to 82. West winds at around 8 km / h will be calm in the morning. 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 that blows from the west at around 10 km / h in the evening. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Friday: A few showers. Partly sunny with a high near 82. Calm wind blowing between 5 and 9 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: A few showers after noon. Mostly sunny, with a peak near 80. South-westerly winds 3 to 8 mph. The probability of precipitation is 20%.

Tonight: A few showers. Partly cloudy, with a low of around 66. Light and changeable wind that blows from the east at around 10 km / h in the evening. The probability of precipitation is 20%.

THE ARTICLE CONTINUES BELOW THE ADVERT

Friday: A few showers after noon. Mostly sunny, with a high near 78. West winds 5 to 8 miles per hour that become calm in the afternoon. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: A few showers, especially after noon. Partly sunny, peaking near 75. Breezes, with northeasterly winds of 16 to 20 mph, with gusts of up to 45 mph. 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 minimum of about 52. Breeze, with a northeasterly wind of about 27 km / h, with gusts of up to 24 km / h. The probability of precipitation is 30%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Friday: A few showers. Partly sunny, with a peak near 75. Breeze, with a northeasterly wind of 8 to 24 km / h, with gusts of up to 34 km / h. The probability of precipitation is 40%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: a few showers. Partly sunny, with a high near 61. Windy, with easterly winds of 20-25 mph, decreasing to 9-24 mph in the afternoon. Winds could reach up to 36 miles per hour. 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 minimum of about 50. Windy, with easterly winds of 13 to 20 mph, with gusts of up to 45 mph. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Friday: Showers likely, mostly after noon. Mostly cloudy, with a peak near 61. Windy, with easterly winds 9 to 30 km / h, with gusts up to 40 km / h. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: single showers. Mostly sunny, with a high near 79. Windy, with east-northeast winds of 21-25 mph, with gusts of up to 32 mph. The probability of precipitation is 20%.

Tonight: A few showers, mostly before midnight. Partly cloudy, with a minimum of about 72. Windy, with east-northeast winds of 22 to 24 mph, with gusts of up to 50 mph. The probability of precipitation is 30%.

Friday: A few showers, mainly after noon. Mostly sunny, with a peak near 79. Breeze, with an easterly wind around 35 km / h, with gusts of up to 45 km / h. The probability of precipitation is 30%.

Feedback

Today: Showers likely, mostly before noon. Mostly cloudy, peaking near 79. North-northwest winds at 6 to 13 mph turning east-northeast in the morning. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely. Mostly cloudy with a low of around 62. Northeasterly winds 7 to 9 mph turning northwest after midnight. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Friday: Showers likely, mostly before noon. Partly sunny, with a high near 79. North winds 6 to 21 mph. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Waikoloa

Today: Sunny, with a peak near 83. Windy, with a northeast wind of 14 to 32 km / h, with gusts of up to 45 km / h.

Tonight: Mostly clear, with a low of about 67th breeze, with an easterly wind of 14 to 27 miles per hour, with gusts of up to 24 miles per hour.

Friday: A few showers after noon. Mostly sunny, with a high near 81. East-northeast winds 6 to 11 mph, which become light and changeable in the afternoon. The probability of precipitation is 20%.

Summary

A high surface in the northeast of the islands maintains locally breezy trade winds. Low clouds and passing trade showers will continue to favor windward and mauka stretches through Friday. A trough on the upper level moving towards the islands is expected to bring lighter winds, higher humidity and a slight increase in showers this weekend. Expect the trade winds to pick up again early next week.

discussion

A nearly steady 1030 mb high surface elevation near 37N 136W, or approximately 1670 miles northeast of Hilo, creates a tight pressure gradient over Aloha State early this morning. This maintains locally breezy east trade winds near the island chain. At altitude, a mid-tropospheric ridge maintains stable atmospheric conditions over the region. Loops of satellite imagery and radar reflectance data show scattered to fractured low clouds with embedded scattered showers moving from east to the windward sides of the islands. The greatest low cloud and shower coverage is currently over East Maui and the Big Island.
The projections show that the surface high will last until Friday night, which is likely to keep the locally breezy east trade winds into early Saturday. The mid-tropospheric ridge will also maintain stable atmospheric conditions throughout the area, which will keep rainfall totals relatively low for the next few days. The low-level trade wind flow will continue to transport low clouds and short trade showers to the windward sections of the islands. The trade showers are most active during the night and early morning hours and can spread over some of the smaller islands down leeward. The elevated terrain on the Big Island and Maui will block trade winds and allow ocean breezes to create clouds and showers over the leeward stretches of these two islands each afternoon.
The global forecasting models seem to agree well that this weekend a trough will be digging itself on the upper plain from the northwest towards the islands. This feature will make the atmosphere a little less stable and could potentially cause a weak bottom trough to develop near the islands. At the same time, a weak surface front is expected to shift to a position northwest of the region. These features would likely cause the background flow to weaken across the state from late Saturday through Monday. The predictive models show some differences in the amount of deep moisture that can spread from the southeast to the eastern islands. For now, the weekend forecast shows an increase in humidity levels over most of the state, with showers becoming a little more active, particularly over parts of the Big Island and upwind Maui from late Saturday through Monday.
The trough on high is expected to move northeast from the islands from Monday. Therefore, the trade winds are expected to intensify again at the beginning of next week. Also, expect more stable and drier atmospheric conditions over the state from Monday night and Tuesday through mid-week.

aviation

Over the windward slopes and coasts, periods of MVFR VIS / CIG in SHRA are expected until Friday, as breezy trades provide spots with gloomy low clouds. The coverage is currently sufficiently widespread to warrant AIRMET SIERRA for mountain darkening over Maui and the Big Island to windward. The coverage was due to wear off this morning, which should allow AIRMET to be canceled. AIRMET Tango will remain in effect due to low level turbulence above and from S to W of all mountains below 8000 feet.

marine

The pressure gradient back over the islands from high pressure far in the northeast of the state will maintain these moderate to locally strong trade winds into the weekend. For the typically windier waters around Maui County and Big Island, a Small Craft Advisory (SCA) applies until Friday afternoon. The SCA may need to be extended to Saturday as the consultation conditions over these windy ocean zones last until the weekend. A front is forecast to be northwest of the chain north of the islands early next week. This limit will ease the pressure gradient northeast of the state and subtly weaken trade. Trades are expected to recover early next week.
The current small northwest swell that circles the islands will subside today. Another small north-north-northwest swell is slated to arrive on Sunday and begin by Monday morning along the north and west coasts with a gradual decline in late Monday through Tuesday. A small swell in the northwest will fill up by the middle of the week which can surf almost head high along many of the north coasts of Kauai and Oahu. Small, long swells in the south will keep the surf from getting completely flat along the south coast. The largest southern pulse is expected to arrive next Tuesday with a gradual decline through Thursday. Several days of moderate to fresh trade winds over and upstream of the islands are sustained by small, windy waves along most of the eastern exposures. A slight weakening in trades early next week could result in a slight decline in the recently increased east coast surf.

HFO clocks / warnings / notices Ad

Small Craft Advisory until Friday 6:00 p.m. HST for Maalaea Bay, Pailolo and Alenuihaha Canals, and the waters south of the Big Island.

Data courtesy of NOAA.gov

Comments are closed.