Hilo

Today: Showers likely, mainly before noon. Partly sunny, with a high near 83. Calm wind becoming east northeast 5 to 8 mph in the afternoon. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely. Mostly cloudy, with a low around 65. East northeast wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: Showers likely, mainly before noon. Partly sunny, with a high near 83. Calm wind becoming east northeast 5 to 8 mph in the morning. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Kona

:

Waimea

Today: Scattered showers. Partly sunny, with a high near 78. Breezy, with a north northeast wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 31 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 58. Breezy, with a northeast wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Tuesday: Scattered showers. Partly sunny, with a high near 78. Windy, with a northeast wind 16 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Kohala

Today: Showers likely, mainly before noon. Mostly cloudy, with a high near 64. Windy, with an east northeast wind 9 to 14 mph increasing to 18 to 23 mph in the afternoon. Winds could gust as high as 32 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely. Mostly cloudy, with a low around 53. Windy, with an east wind 23 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: Showers likely, mainly before noon. Mostly cloudy, with a high near 64. Windy, with an east wind 23 to 29 mph, with gusts as high as 41 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Isolated showers. Mostly sunny, with a high near 84. Windy, with an east northeast wind 22 to 28 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.

Tonight: Isolated showers. Partly cloudy, with a low around 74. Windy, with an east wind 23 to 29 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.

Tuesday: Isolated showers. Mostly sunny, with a high near 84. Windy, with an east wind 26 to 29 mph, with gusts as high as 37 mph. Chance of precipitation is 20%.

Puna

:

Waikoloa

:

Detailed Forecast

Synopsis

A high pressure ridge will remain north of the state through the rest of the week with moderate to breezy trade winds in the forecast into Friday. Weak disturbances aloft will keep brief passing showers in the forecast at least through Thursday, mainly affecting windward and mountain areas. The ridge appears to weaken from late Friday into the weekend with decreasing trends in our wind speeds.

Discussion

Satellite imagery this morning continues to show a large high pressure ridge north of the region with a low pressure system near the Dateline. Radar imagery shows brief passing showers are mainly affecting windward and mountain areas with only the strongest showers reaching some leeward sites. Rainfall amounts will remain light for most locations.
Short range weather models indicate weak mid level disturbances passing through the islands keeping a few showers in the forecast through Thursday. Weather model cross sections show the subsidence inversion, which limits vertical cloud development, ranging from 6000 to 8000 feet elevation through most of the week. This inversion height is high enough for brief passing showers favoring windward and mountain areas in trade wind flow. Drier conditions are forecast for leeward areas. Higher rainfall chances will occur in the typical overnight to early morning hours.
The high pressure ridge north of the state will weaken by late Friday due to this approaching front, and wind speeds will decrease into the light to moderate range by this weekend. Lighter winds in this range are expected during the overnight hours. The long range guidance keeps clouds and showers with this dissipated front too far north of the Hawaiian Islands limiting enhanced rainfall activity with this system.

Aviation

High pressure north of the state will allow for moderate east northeast trade winds to persist through the remainder of this morning and into the afternoon. Thus, scattered showers will mainly be limited to windward slopes and coasts. This activity may bring brief periods of MVFR ceilings and visibility.
AIRMET TANGO remains in effect below 8000 feet for southwest thru west of mountains due to tempo moderate turbulence.

Marine

High pressure north of the islands will keep moderate to strong trades in place through the week. A Small Craft Advisory (SCA) is now in effect for the waters around Maui and the Big Island through 6 PM Friday. This SCA will likely need to be expanded to include additional waters Tuesday through Thursday.
The current south-southwest swell will continue to fade out today, followed by mainly background southerly swells and below normal surf for south facing shores tonight through the upcoming weekend. Aside from a little trade wind swell wrap, surf along north facing shores will be flat through the upcoming weekend. The only notable surf during the next 7 days will be along east facing shores, where persistent moderate to strong trades will keep surf near the summertime average.

HFO Watches/Warnings/Advisories

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

Data Courtesy of NOAA.gov