Hawaii County climate forecast is June 20, 2021

no slide show

Photo credit: James Grenz

Hilo

Today: a few showers. Partly sunny with a high near 81. Light and changeable wind blowing 5 to 8 miles per hour from east-northeast in the morning. 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 67. Calm wind that blows about 10 km / h from west-southwest after midnight. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Monday: A few showers. Partly sunny with a high near 81. Calm wind blowing from the east at 5 to 11 miles per hour in the afternoon. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers after noon. Mostly sunny with a high near 79. Calm wind blowing 5 to 9 miles per hour from the northwest in the morning. The probability of precipitation is 20%.

Tonight: A few showers before midnight. Partly cloudy with a low of about 67. North winds 5 to 11 mph, calm after midnight. The probability of precipitation is 20%.

THE ARTICLE CONTINUES BELOW THE ADVERT

Monday: A few showers after noon. Mostly sunny, with a peak near 80. Light and changeable wind. 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. Mostly sunny, with a peak near 75. Breeze, with a northeast wind of 9 to 24 km / h, with gusts of up to 34 km / h. The probability of precipitation is 30%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: A few showers, mostly before midnight. Partly cloudy, with a low of about 57. East winds 7 to 9 mph. The probability of precipitation is 30%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Monday: A few showers, mainly after noon. Partly sunny, with a high near 76. East winds 7 to 9 mph. 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 peak near 70. East winds around 22 km / h, with gusts of up to 18 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 around 55. East winds around 23 km / h, with gusts of up to 30 km / h. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Monday: Showers likely, mostly after noon. Partly sunny, with highs near 70. East winds 8 to 21 mph. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: Mostly sunny, with a high near 83. Windy, with easterly winds of 17 to 20 miles per hour, with gusts of up to 40 miles per hour.

Tonight: Partly cloudy, with a minimum of about 72. Breezes, with east-northeast winds of 17 to 20 mph, with gusts of up to 24 mph.

Monday: A few showers after noon. Mostly sunny, with a high near 83. Windy, with easterly winds of 17 to 21 mph, with gusts of up to 42 mph. The probability of precipitation is 20%.

Feedback

Today: a few showers. Partly sunny with a high near 77. North-northwest winds 5 to 9 mph turning east-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 minimum of about 64. Light and changeable wind blowing 5 to 11 miles per hour from the north-northeast after midnight. The probability of precipitation is 50%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Monday: A few showers. Partly sunny, with a high near 77. North-northeast winds 7-10 mph. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Waikoloa

Today: Sunny, with a high near 82. North-northwest winds 5 to 11 mph that become light and changeable in the afternoon.

Tonight: Partly cloudy, with a low of 66. Light and changeable wind.

Monday: A few showers after noon. Sunny, with a peak near 84. North-westerly winds around 8 km / h will be calm in the afternoon. The probability of precipitation is 20%.

Summary

Brief transient showers will continue today as ongoing disruption of the upper level slowly drifts away from the islands. The trade winds will weaken in the next few days, so that local sea breezes can develop over protected lee areas. Lighter winds and a more stable ridge will keep drier trends in forecast for most islands Monday through Friday.

discussion

The high pressure ridge far north of the islands weakens when two cold fronts drift east into the central Pacific. Trade winds become weaker as this high pressure ridge decreases in strength. An upper low north of the Hawaiian Islands will slowly drift northward over the next two days, and another weaker low near Kauai will drift west of the area on Monday.
In the short-term forecast, some upper level instability will keep brief shower activity across all islands through Sunday. As the top two lows move further away from the islands, a more stable ridge will build up over the region, creating drying trends Monday through Friday. The trade wind speeds will also decrease, so that daily local sea breezes can develop ashore over protected void areas of each island. Fairly stable conditions will keep rainfall levels on the lighter side, as clouds will struggle to produce rain in most areas. The Kona slopes of the Big Island will continue to see scattered showers each night, mainly after sunset.
In the extended forecast for the next weekend, the high pressure ridge north of the islands increases, so that moderate to stormy trade winds can return over the region. Initial signs suggest that another unstable upper low is moving into the area from the east, potentially increasing shower activity for some islands. Global models are less certain of the location of this upper lows, so our confidence in this wetter solution is only fair right now.

aviation

High pressure in the northeast of the state will keep light to moderate trade winds in place until tonight, with some local land and sea breezes possible in the more sheltered leeks. It is expected that isolated showers in the early morning hours will affect the windward areas. Another round of heated showers during the day will be possible again this afternoon, but the coverage and intensity of the showers should be less than yesterday. For the next 24 hours, mostly VFR conditions should prevail, with some short MVFR zigs and MVFR / IFR Vsbys in showers possible.
No AIRMETs are currently in force.

marine

Trade winds are expected to persist well into the new week as a surface high remains far northeast of the islands. The associated surface ridge, which extends from the high to the southwest, will move south in the first half of the week. The ridge is currently 550 nm north-northwest of Kauai. By Thursday, the ridge will be 240 nm north of Kauai or on the northern limit of our offshore waters. So our light to moderate trades will mostly fall to light through Thursday. The ridge is expected to move north on Friday.
The current south swell is expected to peak today before gradually subsiding by Monday. With the current buoy data, the surf along the south-facing coasts is said to be just below the high surf recommendation criteria of 8 feet for today, but we will be closely monitoring the situation. For the remainder of the week, there will be more smaller swells reaching our south-facing shores, keeping the surf from getting flat. A small to moderate northwest swell comes today, peak day on Monday. A slightly smaller heart rate will arrive Tuesday night, peak Tuesday night, and another swell of similar size will arrive Thursday night through Friday night. With the trade winds expected to weaken in the coming days, the surf along the east-facing coast should be a foot or two less than it is now. Strengthening trades Friday through Saturday will boost the surf along the east facing banks.

HFO watches / warnings / notices

None.

Big Island Now Weather is brought to you by Blue Hawaiian Helicopters.

Check out their Big Island Helicopter Tours today!

Data courtesy of NOAA.gov

Comments are closed.