As Tropical Storm Darby moves across Hawaiian offshore and near shore waters, strong winds and building seas can be expected. A tropical storm warning remains in effect for marine zones from the Kaiwi channel eastward, and a tropical storm watch is in effect for the waters around Oahu. Boaters in those waters should seek safe harbor and secure their craft. A small craft advisory is posted for the waters around Kauai not covered by the tropical watches and warnings.
Near shore windward buoys show increasing seas, ranging from 10 to 13 feet as of 11 PM. Increasing winds and high seas will continue spreading westward through the remaining coastal waters into Saturday, then continue to affect the waters through Sunday. As Darby departs the area early next week, seas will diminish and the weather will trend back toward summertime normals, with a typical trade wind weather pattern becoming established by Tuesday.
Swells associated with the captured fetch from Darby are already affecting the islands, and a high surf warning is in place for east facing shores of Maui and the Big Island, with a high surf advisory in place for exposed east facing shores of the remaining islands. There is a possibility that the high surf warning may be expanded to include east facing shores of islands currently in the advisory, but this is expected to hinge on the eventual track that Darby takes.
High tide at Kahului was 1.4 foot at 4:22 AM early this morning, dropping to a low of 0.1 foot at 10:13 AM this morning, then rising to a high of 2.4 foot at 5:11 PM late this afternoon, before once again dropping to a low of 0.5 foot at 11:55 PM shortly before midnight
The sunrise was at 05:56 am this morning and will set at 07:08 pm this evening. The Moon is currently 18 days old, and is in a Waning Gibbous phase. The next Last Quarter will occur at 11:02 PM on Tuesday, July 26th.
Sunset: 7:05 PM
Weather Outlook for Saturday
Tropical Storm Darby will continue to approach the Big Island from the east overnight, and is expected to affect weather statewide into early next week. A tropical storm warning is in effect for the Big Island and Maui County. Tropical storm conditions are expected to begin late tonight on the Big Island, and on the islands of Maui County on Saturday. While considerable uncertainty remains as to the extent of the wind impacts over the islands, large surf along east facing shores and localized heavy rain, especially on the Big Island and Maui County, are expected during the weekend. Windy and wet weather is expected elsewhere across the island chain. After Darby moves away from the islands early next week, a typical trade wind pattern should resume with passing windward showers.
At 11 PM HST, the Central Pacific Hurricane Center (CPHC) estimated the center of Tropical Storm Darby to be near 18.8N 153.0W. This position is about 150 miles ESE of Hilo, and 360 miles ESE of Honolulu. Darby is moving west near 10 mph, with maximum sustained winds near 60 mph. Tropical storm force winds extend out up to 125 miles from the center. Forecast grids and text products have been updated to reflect the 11 PM CPHC advisory.
Outer rain bands on the western side of approaching Tropical Storm Darby are beginning to move across the Puna district of the Big Island late this evening, with additional rain bands moving across the coastal waters east of the Big Island. Scattered light to moderate showers are present over some windward areas elsewhere around the state, with dry conditions leeward. A tight pressure gradient between a surface high centered far NNW of the islands and approaching Darby is causing locally gusty trade winds. The strongest winds observed so far this evening have occurred at Kealakomo in Hawaii Volcanoes National Park, where north winds of 25 to 35 mph with gusts up to 52 mph are being caused by a combination of the approaching tropical storm and favorable terrain funneling.
Bands of heavy showers and squalls associated with Darby are forecast to impact the windward side of the Big Island starting late tonight. Weather conditions will continue to deteriorate through Saturday as the core of the storm approaches the Big Island coast during the day. It should be noted, as we saw with Tropical Storm Iselle in 2014, damaging wind gusts could occur well away from the core of the system due to unusual local terrain effects like gap winds and channeling between the islands. Heavy rainfall associated with Darby will continue to spread northwest over the other islands during the weekend. As a result, a Flash Flood Watch remains in effect from late tonight through Sunday afternoon for Maui County and the Big Island, and for Saturday evening through Sunday afternoon for Oahu.
Once Darby passes, expect muggy southeasterly flow to develop for a brief period early next week. Thereafter, warm and slightly less humid trade wind weather should return beginning on Tuesday as Darby moves farther away from the state and high pressure builds far to the northeast.
Central Valley (Kahului, Spreckelsville):
TROPICAL STORM WARNING IN EFFECT…FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON. Breezy. Partly cloudy with isolated showers. Lows 69 to 75. Northeast winds 15 to 20 mph. Chance of rain 20 percent.
Leeward West (Lahaina, Ka`anapali):
TROPICAL STORM WARNING IN EFFECT…FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON. Breezy. Partly cloudy with scattered showers. Lows 71 to 77. Northeast winds 15 to 20 mph. Chance of rain 40 percent.
Windward West (Wailuku, Waiehu):
HIGH SURF WARNING IN EFFECT UNTIL 6 AM HST SUNDAY…TROPICAL STORM WARNING IN EFFECT…FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON. Breezy. Mostly cloudy with scattered showers. Lows 60 to 74. Northeast winds 15 to 20 mph. Chance of rain 50 percent.
Windard Haleakala (Hana, Haiku, Makawao):
HIGH SURF WARNING IN EFFECT UNTIL 6 AM HST SUNDAY…TROPICAL STORM WARNING IN EFFECT…FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON. Mostly cloudy. Breezy. Scattered showers late in the evening, then showers likely after midnight. Locally heavy rainfall possible after midnight. Lows around 75 at the shore to around 56 at 5000 feet. Northeast winds 15 to 20 mph. Chance of rain 70 percent.
Leeward Haleakala (Kihei, Wailea, Makena):
TROPICAL STORM WARNING IN EFFECT…FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON. Breezy. Mostly clear with isolated showers. Lows around 73 at the shore to 55 to 63 upcountry. Northeast winds 15 to 20 mph. Chance of rain 20 percent.
TROPICAL STORM WARNING IN EFFECT…FLASH FLOOD WATCH IN EFFECT THROUGH SUNDAY AFTERNOON. Breezy. Partly cloudy with scattered showers. Lows around 46 at the visitor center to around 43 at the summit. East winds 20 to 25 mph. Chance of rain 50 percent.
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