Hawaii Island Weather Update for January 19th, 2021

Drier and stable weather conditions will continue to prevail over the Island of Hawaii, breezy trade winds are expected later this week. All-weather advisories for Hawaii Island have since been canceled as well.

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Published by: HIRSC - Weather Team

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Hawaii Weather Discussion as of 8:45 pm Monday evening (January 19th):


Synopsis

Heavy showers are possible over Kauai tonight with a chance of flash flooding. Some clearing is expected over the rest of the state but wet trade wind weather is in store through the week.

Discussion

A surface trough across the western islands continues to trigger deep convection far southwest from Oahu and Molokai, but this activity has decreased a bit across local waters within the past few hours. Nevertheless, the threat for flash flooding remains sufficiently high to keep a Flash Flood Watch up for Kauai and Niihau through tonight. The surface trough is expected to move west of Kauai by Wednesday morning and the threat for flash flooding will decrease. An upper trough straddling the state provided instability that fueled heavy rainfall over Kauai and isolated downpours over the rest of the state earlier today. An increase in clouds is expected tonight over the eastern islands as mid and upper clouds stream overhead from the south. Once the surface trough pushes west of Kauai, easterly trade winds will spread across the state with showers focused over windward and mountain areas. However, models show the upper trough remaining through the week. Therefore, we expect a wet trade wind pattern with rainfall maxima overnight and during the early morning hours.

Island of Hawaii Forecast for Wednesday, January 20th, 2021:


Kailua-Kona:


Wednesday Scattered showers, mainly after noon. Partly sunny, with a high near 81. Light and variable wind becoming west southwest around 5 mph in the afternoon. The chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday Night Isolated showers. Partly cloudy, with a low around 67. South southeast wind around 5 mph becoming light and variable in the evening. The chance of precipitation is 20%.


Kamuela (Waimea):


Wednesday Scattered showers. Mostly cloudy, with a high near 72. Breezy, with a northeast wind of 15 to 18 mph, with gusts as high as 25 mph. The chance of precipitation is 50%. New precipitation amounts between a half and three-quarters of an inch possible.

Wednesday Night Scattered showers. Mostly cloudy, with a low around 53. Breezy, with a northeast wind 15 to 17 mph, with gusts as high as 24 mph. The chance of precipitation is 50%. New precipitation amounts between a quarter and half of an inch possible.


Kapa'au:


Wednesday Showers likely, mainly before noon. Mostly cloudy, with a high near 76. Breezy, with an east wind of 15 to 18 mph, with gusts as high as 25 mph. The chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night Showers likely. Mostly cloudy, with a low around 65. Breezy, with an east wind of 15 to 18 mph, with gusts as high as 25 mph. The chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.


Hilo:


Wednesday Showers likely. Mostly cloudy, with a high near 78. Light and variable wind becoming northeast around 6 mph. The chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night Showers likely. Mostly cloudy, with a low around 66. Light west southwest wind. The chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.


Volcano:


Wednesday Scattered showers. Mostly cloudy, with a high near 66. Northeast wind 8 to 13 mph. Chance of precipitation is 40%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday Night Scattered showers. Mostly cloudy, with a low around 52. North wind 7 to 11 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.


Na'alehu:


Wednesday Isolated showers. Partly sunny, with a high near 76. Northeast wind 9 to 14 mph, with gusts as high as 18 mph. The chance of precipitation is 20%.

Wednesday Night Isolated showers. Partly cloudy, with a low around 66. North northeast wind 9 to 14 mph, with gusts as high as 18 mph. The chance of precipitation is 20%.

Mauna Loa and Maunakea Summit Weather Update as of 8:45 pm Monday evening:


Maunakea Access Road (John A. Burns Way) remains closed to the public at Hale Pohaku (Maunakea Visitor Information Center) at 9,200 feet due to forecast of high humidity, fog, freezing temperatures, convection, heavy snow, and icy road conditions. A morning road check will be done tomorrow with updates to follow.


Maunakea Summit Forecast as of 9:00 pm

Mauna Loa Summit Forecast as of 9:00 pm

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