Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Pukoo - Halawa Valley - Kalaupapa * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Kaunakakai - Kualapuu - Kepuhi * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Manele Harbor - Kaumalapau Harbor - Shipwreck Beach * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Lanai City - Lanai Airport * WIND - LATEST LOCAL FORECAST: Equivalent Tropical Storm force wind

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * WIND - LATEST LOCAL FORECAST: Equivalent Tropical Storm force wind - Peak Wind Forecast: 30-40 mph with gusts to 60 mph - Window for Tropical Storm force winds: Thursday morning until Friday afternoon

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Wailuku - Waihee - Kapalua * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Lahaina - Olowalu - Napili * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Kahului - Puunene - Maalaea * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Haiku - Hana - Kipahulu * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Kihei - Wailea - Keokea * WIND

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Hurricane Watch

...HURRICANE WATCH REMAINS IN EFFECT... * LOCATIONS AFFECTED - Haleakala National Park * WIND - LATEST LOCAL FORECAST: Below tropical storm force wind - Peak Wind Forecast: 25-35 mph with gusts to 50 mph

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High Surf Advisory

...HIGH SURF ADVISORY FOR EAST FACING SHORES OF THE BIG ISLAND AND MAUI... .Long-period swells from Hurricane Lane will continue to bring large surf along east facing shores of the Big Island and Maui today. ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS

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High Surf Advisory

...A FLASH FLOOD WATCH HAS BEEN ISSUED FOR THE STATE OF HAWAII... Latest forecast models indicate that, regardless of the eventual track and intensity of Lane, an extremely moist and unstable air mass will move over the islands beginning Wednesday morning, and will remain in place through the end of the week. This is expected to result in very heavy rainfall, potentially leading to flash

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Flash Flood Watch

...FLOOD WATCH FOR ALL HAWAIIAN ISLAND FROM WEDNESDAY... .As Hurricane Lane approaches the islands from the south, deep tropical moisture associated with Lane will spread across the island chain from the east, with increased potential for heavy rainfall. ...FLASH FLOOD WATCH IN EFFECT FROM WEDNESDAY MORNING THROUGH

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Flash Flood Watch

This product covers the Hawaiian islands **MAJOR HURRICANE LANE IS EXPECTED TO TURN TOWARD THE MAIN HAWAIIAN ISLANDS LATER THIS WEEK** NEW INFORMATION --------------- * CHANGES TO WATCHES AND WARNINGS:

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1-3++ foot
1-3++ foot
1-3++ foot
1-4++ foot

Please note that tropical cyclone operations are in effect.

A weak surface trough west of Kauai will move west away from the area today and tonight as high pressure builds to the north. This will result in a gradually increasing trade wind flow through Tuesday. A Small Craft Advisory has been posted for the windier areas around Maui and the Big Island in anticipation of the increasing trade wind flow. As Hurricane Lane moves into an area south of the islands by mid-week, the pressure gradient will likely increase, likely leading to increasing trade winds, and potentially an expansion of the SCA. More significantly, Tropical Storm and/or Hurricane Watches may be required for portions of the southern coastal waters later today. There is significant uncertainty regarding the position and intensity of Lane later in the week, so it is too early to determine what impacts Lane may eventually bring, and mariners need to continue to closely monitor forecasts.

Long period east-southeast swells from Hurricane Lane are building at buoy 51004 to the south-east of the Big Island this morning, while the PacIOOS buoy in Hilo is just beginning to detect long-period energy from the east. A High Surf Advisory for east facing shores of Maui and the Big Island is now in effect. As Hurricane Lane moves into an area south of the islands later this week, south swell will likely increase, with a wide variety of wave periods leading to rough and potentially damaging surf. Still significant uncertainty and difficult to know the level of impacts, but there is potential for large seas/swells from Lane to lead to warning-level surf along east through south facing shores of the islands. A small north-northwest swell is expected to arrive Monday and peak on Tuesday before gradually diminishing Wednesday and Thursday.

Hawaii Wave Height Model

Tide Predictions

Low tide at Kahului was 0.38 foot at 2:00 PM early this afternoon, rising to a high of 2.10 foot at 2:00 PM early this afternoon, then dropping to a low of 1.06 foot at 2:00 PM early this afternoon, before once again rising to a high of 1.14 foot at 2:00 PM early this afternoon.

The sunrise was at 06:05 am this morning and will set at 06:52 pm this evening. The Moon is currently 10 days old, and is in a Waxing Gibbous phase. The next Full Moon will occur at 11:58 AM on Sunday, August 26th.

Hawaii Wind Report

Maui Weather

°/°
Wind: n/a at 0 mph
Sunrise:
Sunset:
current observations as of 7am August 21st, 2018

Weather Outlook for Monday, 20th August 2018

Summary

A drier airmass will persist across the state through Tuesday, with trade winds strengthening. For the remainder of the week, the forecast will be highly dependent on the track and intensity of Hurricane Lane. An increase in winds and showers will be the likely result based on the latest forecast for Lane.

Detailed Discussion

Please note that tropical cyclone operations are in effect. So as to incorporate the latest forecast information from the Central Pacific Hurricane Center (CPHC), public forecast updates from the Honolulu Forecast Office will come shortly after forecast updates from CPHC, namely after 5 and 11 am/pm, instead of the normal 4 am/pm.

Drier airmass has spread across the state since last night, though early morning Lihue sounding only indicated a slight drying, while Hilo sounding has a more typical trade wind weather type profile. Latest radar data revealed not much showers, though satellite imagery, even with some high clouds obscuring, indicated there are embedded low clouds just upstream east of the islands. A surface high pressure far northeast of the state providing the trade winds continues to drop south-southwestward. Meanwhile another high pressure far northwest of the state is advancing east as well. This will allow a tightening of pressure gradient across the area, resulting in an increase in trade winds for the state. Regardless, the more typical trade wind weather is back across area, with passing low clouds and showers affecting mainly windward and mountain areas. High clouds will stream over the area at times today and will keep skies a little more opaque at times.

The aforementioned two highs will gradually merge and take up a position far to our north by Tuesday. This will lead to a further strengthening in trade wind speeds across area. The somewhat drier and more stable airmass will persist in the as well. Therefore, expect breezy trade wind weather for the islands Tuesday, with passing low clouds and showers affecting mainly windward and mountain areas. Lee areas of the smaller islands may also see some clouds and showers as winds may be strong enough to carry them over.

As for Wednesday through the weekend time frame, our weather will be highly dependent on the track and intensity of Hurricane Lane. It is still too early to determine the weather impacts from Lane will have on the state. The last forecast track from the Central Pacific Hurricane Center still has Lane passing south of the main Hawaiian Islands, but has it tracked closer to the island chain. If this track holds, the potential impacts on the islands weather would be an increase in wind speeds due to a tightened pressure gradient between high pressure north of the state and Lane traversing to our south. Also moisture associated with Lane would likely bring an increase in shower activity over the Big Island Wednesday, mainly east and southeast and then eventually spreading up the island chain through the remainder of the week.

Everyone is encouraged to monitor the latest advisories on Hurricane Lane from the Central Pacific Hurricane Center.

Central Valley (Kahului, Spreckelsville):

Mostly clear. Lows 69 to 75. Northeast winds 10 to 15 mph.

Leeward West (Lahaina, Ka`anapali):

Breezy. Mostly clear with isolated showers. Lows 70 to 77. Northeast winds 15 to 20 mph. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

Breezy. Partly cloudy with isolated showers. Lows 62 to 74. Northeast winds 15 to 20 mph. Chance of rain 20 percent.

Windard Haleakala (Hana, Haiku, Makawao):

HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST TUESDAY. Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs around 85 at the shore to around 72 at 5000 feet. East winds 10 to 20 mph. Chance of rain 50 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Mostly clear. Breezy. Lows around 72 at the shore to 55 to 61 upcountry. Northeast winds 10 to 20 mph.

Haleakala Summit

Mostly clear. Breezy. Lows around 49 at the visitor center to around 46 at the summit. East winds 20 to 25 mph.


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