Hawaii County climate forecast is July 12, 2021

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Photo credit: James Grenz

Hilo

Today: Showers likely, mostly before noon. Mostly cloudy, with a high near 83. East-southeast winds around 9 mph. The probability of precipitation is 70%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: A few showers. Mostly cloudy with a low of 66. Light east wind. The probability of precipitation is 50%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tuesday: Showers likely, mostly before noon. Partly sunny, with a high near 83. Light northeast winds increasing to 5 to 10 mph 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. Sunny, with a high near 79. West winds around 9 mph. The chance of rainfall is 20%.

Tonight: A few showers before midnight. Partly cloudy with a low of about 65. North winds 5 to 11 mph becomes calm after midnight. The probability of precipitation is 20%.

THE ARTICLE CONTINUES BELOW THE ADVERT

Tuesday: A few showers after noon. Mostly sunny, with a peak near 79. Calm wind blowing from west-northwest at around 10 km / h. 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: single showers. Mostly sunny, with a high near 78. Windy, with northeasterly winds of 21 to 42 mph, with gusts of up to 38 mph. The probability of precipitation is 20%.

Tonight: A few showers, mostly after 7pm. Mostly cloudy with a minimum of about 58. Windy, with easterly winds of 11 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.

Tuesday: A few showers. Partly sunny, with a high near 78. East-northeast wind around 13 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 high near 64. Windy, with an easterly wind at 23 mph, with gusts up to 32 mph. The probability of precipitation is 40%. 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 easterly winds 15 to 20 mph, with gusts up to 45 mph. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tuesday: Showers likely. Mostly cloudy with a high near 64. Windy, with east-northeast winds of 18 to 24 mph, with gusts of up to 54 mph. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: A few showers, especially after noon. Mostly sunny, with a peak near 84. Windy, with an easterly wind around 42 mph, with gusts up to 54 mph. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Partly cloudy, with a low point around 74. Windy, with an east-northeast wind of 17 to 34 km / h, with gusts of up to 42 km / h. The probability of precipitation is 20%.

Tuesday: A few showers. Mostly sunny, with a high near 84. Windy, with easterly winds of 17 to 21 mph, with gusts of up to 42 mph. The probability of precipitation is 20%.

feedback

Today: Showers, mostly before noon. High near 82nd easterly winds 9 to 11 miles per hour. The probability of precipitation is 80%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: Showers likely, mostly before midnight. Mostly cloudy, with a low of about 64. North-northeast winds 8 to 10 mph. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tuesday: Showers likely, mostly before noon. Mostly cloudy, with a peak near 82. Breezes, with northeasterly winds of 10 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 84. Windy, with a north wind of 8 to 30 km / h, with gusts of up to 40 km / h.

Tonight: A few showers before midnight. Mostly clear, with a low of about 66. Northeast wind about 10 km / h. The probability of precipitation is 20%.

Tuesday: A few showers after noon. Sunny, with a high near 84. North winds 6 to 8 mph. The chance of rainfall is 20%.

summary

A high pressure ridge north of the islands will persist through the weekend, generating moderate to stormy trade winds across the state. A narrow upper trough and passing disturbances at a low level create periods of rain that favor the windward and mountainous areas from night to early morning. The rainy trade winds will likely last until Friday. Long-range models point to slight drying trends this weekend.

discussion

This morning’s satellite imagery continues to show a narrow upper trough north of the Hawaiian Islands. A subtropical jet stream south of this upper trough will continue to produce periods of high cirrus clouds over the islands during the week. These upper level features will continue to weaken trade wind inversion heights above the 8,000 foot level, allowing for lower cloud heights and above normal rainfall for this time of year. Cirrus clouds will continue to enhance the colors of sunrise and sunset across the state.
In the lower atmosphere, there is currently a faint trough over the eastern Hawaiian Islands, shown on satellite imagery and 700MB streamlines. This system will continue to slowly drift west through the state through Tuesday. The low convergence associated with this trough will increase shower activity on the eastern islands today. For the western islands, a smaller increase in shower activity is forecast until tonight. Another low-level disruption will drift east to west across the Hawaiian Islands on Wednesday and Thursday, creating another round of increased showers across the state.
The wind pattern stays the same, with a fairly strong high pressure ridge locked in place north of the state. This ridge will generate moderate to breezy winds throughout the region. Showers are expected, favoring the windward and mountainous areas, with the trend being higher at night until the early hours of the morning. Expect some of the heavier showers to spread into the void areas of each island. This improved shower regime is likely to last through Friday. Long-range models point to slight drying trends this weekend.

aviation

Locally strong trade winds will persist as the surface high pressure in the N direction maintains a narrow, low-level pressure gradient across the area. AIRMET Tango for low turbulence above and downstream of the terrain remains advertised for all islands.
A modest instability associated with a nearby trough on the upper level is combined with a low level of moisture penetrating from E to fuel windward showers. While VFR conditions are expected at the terminals and in most leeward areas, MVFR-VIS / CIG periods are expected over windward areas, which may require an AIRMET for mountain shading. AIRMET SIERRA is currently booked for the windward slopes of Oahu.

marine

High pressure in the north of the state in a zonal alignment over 40N latitude will be the dominant weather characteristic this week. This high relative to the lower equatorial pressure will keep the north-northeast pressure gradient tight across the area. This will continue to support fresh easterly trade winds over offshore and offshore Hawaiian waters. For locally strong trades, a Small Craft Advisory (SCA) applies until this afternoon for the waters east and including the Kaiwi Canal. The SCA will continue through Tuesday afternoon for the typically windier zones around Maui County and the Big Island. It is very likely that this SCA will need to be renewed by the middle of the week.
The swell in the background maintains very little surf along the south facing coastlines. Fresh eastern trades will hold brief, slightly elevated wind waves along many eastern positions. The recent storms traveling through New Zealand are sending swells north towards Hawaii. Those long, little swells in the south are scheduled to arrive late in the week and give the surf on the south coast a little bump.

HFO watches / warnings / notices

Small Craft Advisory through Tuesday 6:00 p.m. HST for all eastern canals and coastal waters.
Small Craft Advisory until 6:00 p.m. HST tonight for Kaiwi Channel, Maui County Windward Waters, Maui County Leeward Waters, Big Island Windward Waters.

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Data courtesy of NOAA.gov

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