Hawaii County climate forecast is Might 13, 2021

Photo credit: James Grenz

Hilo

Today: a few showers. Partly sunny, peaking near 83. Calm wind blowing from the northeast at 5 to 9 miles per hour 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 66. East-northeast wind with about 10 km / h becomes calm. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Friday: Showers likely, mostly before noon. Partly sunny with a high near 81. Light north-northeast winds blowing 5 to 10 miles per hour from the northeast in the afternoon. The probability of precipitation is 60%. 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. East winds 5 to 8 mph turning west-southwest 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 before midnight. Partly cloudy, with a low of about 65. East winds 6 to 8 mph. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

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Friday: A few showers, mainly after noon. Mostly sunny with a high near 78. East winds 7 to 13 miles per hour turning west-southwest in the morning. 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. Partly sunny, with a high near 73. Windy, with northeasterly winds of 20 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.

Tonight: A few showers. Mostly cloudy with a minimum of about 56. Windy, with northeasterly winds of 18 to 21 mph, with gusts of up to 45 mph. The probability of precipitation is 40%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Friday: A few showers. Partly sunny, with a high near 71. Windy, with northeasterly winds of 21 to 24 mph, with gusts of up to 54 mph. The probability of precipitation is 40%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Kohala

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Today: Showers likely. Mostly cloudy, with a peak near 62. Windy, with easterly winds 21 to 24 mph, with gusts up to 54 mph. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely. Mostly cloudy, with a low of 55. Windy, with an easterly wind of 23 to 40 km / h, with gusts of up to 60 km / h. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Friday: Showers likely, mostly before noon. Mostly cloudy with a high near 66. Windy, easterly winds 22 to 24 mph, with gusts up to 54 mph. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: A few showers after noon. Mostly sunny, with a peak near 80. Windy, with an easterly wind around 40 km / h, with gusts of up to 32 km / h. The probability of precipitation is 20%.

Tonight: A few showers, mostly before midnight. Partly cloudy, with a low of about 73. Windy, with east-northeast winds of 21 to 23 mph, with gusts of up to 48 mph. The probability of precipitation is 30%.

Friday: single showers. Mostly sunny, with a high near 79. Windy, with an easterly wind of 22 to 24 mph, with gusts of up to 50 mph. The probability of precipitation is 20%.

Feedback

Today: a few showers. Partly sunny, with a peak near 80. North-northwest wind 7 to 22 km / h, which comes from the northeast in the morning. Gusts of wind can reach up to 18 miles per hour. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely, mostly after midnight. Mostly cloudy with a low of about 63. Northeast winds 8-10 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, peaking near 78th breeze, with north-northeast winds of 9 to 25 mph, with gusts of up to 35 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 high near 82. Windy, with an east-southeast wind of 16 to 24 miles per hour turning northeast in the morning. Winds can blow up to 34 miles per hour.

Tonight: Mostly clear, with a low of about 66. Windy, with an easterly wind of about 18 miles per hour, with gusts of up to 40 miles per hour.

Friday: A few showers after noon. Mostly sunny, with a high near 81. Windy, with northeasterly winds of 17 to 24 mph, with gusts of up to 54 mph. The probability of precipitation is 20%.

Summary

The surface high pressure far north of the island chain will maintain moderate to locally breezy trade winds this weekend. Low clouds and passing trade showers will continue to favor windward and mauka areas, while short showers are possible in some leeward stretches.

discussion

A surface elevation of 1031 MB this morning is centered near 39N 150W, or just over 1300 miles north-northeast of Honolulu. A surface ridge extends southwest from this elevation to a point approximately 830 miles north of Kauai. The narrow pressure gradient south of these features maintains moderate to locally breezy trade winds near the island chain.
In the water vapor images to the northeast of the islands, a low trough can be seen on the upper level. At the same time, a weak short wave valley moves down over the islands. The trade wind current at a low level is currently transporting scattered to broken up low clouds with embedded scattered showers to the windward sides of the islands, based on satellite images and radar reflection data. In addition, the trades are strong enough to throw a few brief showers into the leeward stretches of some of the smaller islands.
The predictive models suggest that surface hypertension will persist far north of the state through the weekend. As a result, expect the moderate to locally breezy trade winds to persist. The predictive models also suggest that the top lows and troughs stall later today and will remain northeast of the islands through Sunday. By early next week, the upper low is likely to lift out of the region to the northeast.
The relatively close proximity of the upper lows and lows to the state could improve the low clouds and trade showers somewhat through this weekend. However, the models show a decrease in the low sources of moisture upstream of the state over the course of this week. If so, it would potentially limit the actual cloud cover and precipitation at the beginning of the weekend. Another short wave swings around at the end of this weekend. This could help improve shower activity if there is enough moisture at the same time that this feature arrives. The current forecast shows a typical trade wind weather pattern this weekend, unless we see evidence that there will actually be increased shower activity.

aviation

The high pressure in the north of the state will keep business moderate to airy until tonight. Passing showers can bring short MVFR Zigs / Vsbys to windward areas, mainly in the early hours of the morning and night. Otherwise, VFR conditions should apply nationwide.
AIRMET Sierra remains in effect to darken the mountains over windward sections of the Big Island. Conditions should improve this morning.

marine

Due to the sustained high pressure north of the main Hawaiian islands, a small craft advisory for the windier waters around Maui and the Big Island will remain in effect until Friday afternoon. The surf will stay along the south-facing coastline while a series of overlapping small, long-lasting swells originating from the southern hemisphere pass by. The eastern coasts will be affected by small swells and choppy wind waves due to continued moderate to fresh trade. The surf along the north-facing coasts remains low when the swell in the northwest subsides.

HFO clocks / warnings / notices Ad

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

Data courtesy of NOAA.gov

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