Hawaii County climate forecast is Could 04, 2021

Photo credit: James Grenz

Hilo

Today: a few showers. Partly sunny, with a high of near 82. Light and changeable winds blowing between 6 and 11 miles per hour from the east in the mornings. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely, mostly after 7pm. Mostly cloudy with a minimum of around 68. East winds 5 to 8 mph become calm after midnight. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Wednesday: Showers likely, mostly before 1pm. Mostly cloudy, with a peak near 81. Calm wind blowing north-northeast at 10 km / h in the morning. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers, mainly after 1 p.m. Mostly sunny with a peak near 82. West-northwest winds 6 to 11 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers, mostly before 1am. Mostly cloudy, with a low of 66. Northwest winds 5 to 11 mph, which become calm in the evening. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

THE ARTICLE WILL CONTINUE UNDER THE AD

Wednesday: A few showers, mostly after 1 p.m. Mostly cloudy, with a high near 81. Calm wind. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Waimea

THE ARTICLE WILL CONTINUE UNDER THE AD

Today: Showers probably after noon. Increasing cloudiness, peaking near 75. Calm wind blowing north-northeast 5 to 9 miles per hour in the afternoon. The probability of precipitation is 60%. 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 55. Breeze, with a northeasterly wind of 10 to 30 km / h, with gusts of up to 40 km / h. The probability of precipitation is 50%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Wednesday: A few showers. Mostly cloudy, with a peak near 74. Windy, with a northeasterly wind of 18 to 35 km / h, with gusts of up to 50 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 WILL CONTINUE UNDER THE AD

Today: Showers probably after noon. Increasing clouds, with a peak near 68. Calm wind blowing in the afternoon at about 8 km / h from east-southeast. 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 around 53. Windy, with an east-northeast wind of 5 to 16 km / h, which increases to 13 to 30 km / h after midnight. Gusts of wind could reach up to 40 km / h. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Wednesday: Showers likely, mostly after noon. Mostly cloudy with a peak near 67. Breezes, with east-northeast winds of 18 to 20 mph, with gusts of up to 45 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, especially before noon. Mostly sunny, with a high near 79. Windy, with easterly winds around 18 mph, with gusts up to 23 mph. The probability of precipitation is 30%.

Tonight: A few showers. Mostly cloudy with a minimum of about 70. Windy, with east-northeast winds of 17 to 20 mph, with gusts of up to 40 mph. The probability of precipitation is 30%.

Wednesday: A few showers. Mostly cloudy, with a peak near 79. Breeze, with an easterly wind of 20 to 35 km / h, with gusts of up to 45 km / h. The probability of precipitation is 30%.

Feedback

Today: Showers likely, mostly before noon. Partly sunny with a high near 80. Light and changeable wind blowing 5 to 10 miles per hour from the east in the morning. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Occasional showers. Low around 65. Calm wind coming in from the west at around 10 km / h. The probability of precipitation is 80%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Wednesday: Showers likely. Cloudy with a high near 79. Light north wind blowing 5 to 10 mph north-northeast in the morning. The probability of precipitation is 70%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Waikoloa

Today: A few showers after noon. Mostly sunny, with a peak near 81. Light and changeable wind, blowing from west-northwest 5 to 11 km / h. The probability of precipitation is 50%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers before midnight. Increasing clouds, bottoming around 67. East winds 5 to 10 mph, weak after midnight from east-southeast. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Wednesday: A few showers after noon. Mostly cloudy, with a high of almost 80. Light and changeable wind that comes from the north-northeast in the morning between 9 and 22 km / h. Gusts of wind can reach up to 18 miles per hour. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Summary

The trade winds will be weak enough for leeward ocean breezes today, and the showers will be more active mainly over the leeward terrain this afternoon as an upper low develops west of the state. The trade winds will intensify tonight and Wednesday as the upper low sends thick high clouds over us. The easing upper low will slowly move across the state late Thursday into the weekend, potentially bringing with it wet and choppy weather.

discussion

The trades continue to weaken and the atmosphere is becoming less stable. An excavated trough on the upper level, centered several hundred miles northwest of Kauai, enlivens a derelict front that extends far north of the islands. This weakens the pressure gradient across the state and slowly lets the trade winds subside. The top trough also erodes the top ridge above the condition resulting in decreased stability. As a result, the showers in the clouds to the west of the islands remained somewhat active, while on the Big Island there were scattered showers under the wind for most of the night. The decreasing trade winds have meant that most of the showers remain off the windward coasts.
The trade winds become weak enough for a sea breeze to develop over sheltered leeward areas in the afternoon, which is likely to trigger a few brief, heavy showers over the leeward terrain. There will be some showers in windward areas, but the GFS and ECMWF suggest that a band of increased humidity will remain east of the state.
Tonight Thursday the trade winds will build up again and high clouds will thicken over them as the upper plain cuts about 600 miles west of Kauai and the surface hypertension passes far north of the state. The JRC and ECMWF show that Wednesday afternoon showers increase downwind when a narrow strip of moisture penetrates, but as the high clouds limit warming during the day, afternoon winds are less likely.
The greatest potential for increased showers and choppy conditions across the state appears to be Thursday night and Friday as the weakening upper levels drift over the islands. Windy trade winds should persist and preserve the highest probability of precipitation over windward slopes, but spotty, locally violent afternoon showers will be possible over the lee areas, particularly on the Big Island and Maui.
The weak bottom of the upper level will linger over the state over the weekend and create some uncertainty. The surface high pressure in the northeast is sustained locally breezy east trade winds, which are strongest over the Big Island and Maui. Although the JRC and ECMWF show slightly drier air entering from the east, we could still face a threat to troubled conditions. Both models show increasingly stable weather next Monday.

aviation

Light trade winds from the east are expected across the state today. Clouds, showers, and isolated MVFR conditions will favor north-east facing sections of the smaller islands throughout the day, but some clouds and showers are also possible in the lee areas where an afternoon sea breeze develops. By tonight the easterly trade winds will pick up a bit again and will be airy for the rest of the week. A low altitude will increase the chance of precipitation starting tonight, although VFR conditions are expected to prevail at most airports throughout the forecast period.
AIRMETs are not currently in effect, although mountain darkening can become an issue for indoor locations as cloud cover and showers increase today.

marine

The trade winds, weakened today, will intensify on Wednesday until the next weekend to fresh to locally strong magnitudes.
Surfing will stay below the high recommended surf levels on all shores this week. The returning trade winds will bring choppy seas and surf to the windward coastal waters and east-facing shores by late Wednesday of the week.

HFO clocks / warnings / notices Ad

None.

Data courtesy of NOAA.gov

Comments are closed.