Hilo

Today: Cloudy with showers. Highs 74 to 80 near the shore to around 62 at 4000 feet. East winds 10 to 15 mph. Chance of rain 90 percent.

Tonight: Showers. Lows 61 to 67 near the shore to around 52 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain near 100 percent.

Saturday: Cloudy with numerous showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 73 to 80 near the shore to around 62 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Kona

Today: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs around 84 near the shore to around 65 near 5000 feet. Southeast winds up to 10 mph shifting to the southwest in the afternoon. Chance of rain 50 percent.

Tonight: Mostly clear. Isolated showers in the evening. Lows around 70 near the shore to 44 to 50 near 5000 feet. East winds up to 10 mph. Chance of rain 20 percent.

Saturday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs around 83 near the shore to around 64 near 5000 feet. Northeast winds around 10 mph shifting to the southwest up to 10 mph in the afternoon. Chance of rain 50 percent.

Waimea

Today: Windy. Mostly cloudy with scattered showers. Highs around 76 near the shore to 64 to 73 near 3000 feet. East winds 10 to 30 mph with gusts to 55 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with numerous showers. Lows 60 to 67 near the shore to 53 to 58 near 3000 feet. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 70 percent.

Saturday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 70 to 76 near the shore to 63 to 73 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Kohala

Today: Windy. Mostly cloudy with scattered showers. Highs around 76 near the shore to 64 to 73 near 3000 feet. East winds 10 to 30 mph with gusts to 55 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with numerous showers. Lows 60 to 67 near the shore to 53 to 58 near 3000 feet. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 70 percent.

Saturday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 70 to 76 near the shore to 63 to 73 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

South Big Island

Today: Sunny and windy. Isolated showers in the afternoon. Highs around 81 near the shore to around 66 near 5000 feet. East winds 10 to 30 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Breezy. Lows around 69 near the shore to around 47 near 5000 feet. East winds 10 to 25 mph.

Saturday: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 82 near the shore to around 63 near 5000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Puna

Today: Cloudy with showers. Highs 74 to 80 near the shore to around 62 at 4000 feet. East winds 10 to 15 mph. Chance of rain 90 percent.

Tonight: Showers. Lows 61 to 67 near the shore to around 52 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain near 100 percent.

Saturday: Cloudy with numerous showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 73 to 80 near the shore to around 62 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Waikoloa

Today: Sunny and windy. Isolated showers in the afternoon. Highs 79 to 86 near the shore to 63 to 68 above 4000 feet. East winds 10 to 30 mph with gusts to 65 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Windy. Lows around 70 near the shore to 47 to 53 above 4000 feet. East winds 10 to 30 mph with gusts to 50 mph decreasing to 10 to 15 mph after midnight.

Saturday: Mostly sunny. Highs 78 to 86 near the shore to 63 to 70 above 4000 feet. Northeast winds 10 to 15 mph.

Detailed Forecast

Synopsis

A very strong high pressure system north of the state will maintain strong and gusty trade winds today. Periods of showers will favor typical windward and mountain areas, with a few showers drifting into leeward areas at times. Trade wind speeds will decrease into the moderate to breezy range by Sunday. A slight drying trend remains in the forecast through the first half of next week.

Discussion

The strong high pressure system north of the state will slowly weaken as the center drifts south towards the island chain. The latest forecast guidance shows breezy to windy conditions continuing at least through this afternoon and possibly into Saturday. Most areas will see wind speeds blowing at advisory levels with Leeward Kohala on the Big Island observing periods of High Wind Warning level wind speeds and higher gusts. The strongest wind gusts last night were observed at Kohala Ranch and Waikoloa Village in the 60 to 65 mph range. Wind speeds across the state will begin to slowly weaken starting on Saturday with wind speeds decreasing into the moderate to breezy range by Sunday.
Periods of showers will continue to blow into windward and mountain areas on these strong trade winds, favoring the overnight to early morning hours. A few of the stronger showers will reach the typically drier leeward zones. Subsidence temperature inversion heights will remain around 8,000 feet through the weekend, keeping all windward areas in a fairly wet rainfall pattern. Shower activity will begin to trend drier early next week as a ridge aloft increases regional stability ahead of an approaching cold front.
Long range model solutions continue to show a weakening cold frontal cloud band sweeping into the islands from the northwest by the middle of next week. This passing front should bring another round of enhanced showers to all islands by the middle to end of next week. Northerly trade winds will blow much cooler temperatures into the Hawaiian Islands from Thursday onward after the frontal band passes through each island.

Aviation

Strong high pressure north of the state will continue to drive breezy to windy trades during the next couple days. MVFR cigs/vsbys will affect windward slopes and coasts at times, with a few decaying showers reaching leeward areas where predominantly VFR conditions should prevail.
AIRMET Sierra remains in effect for mountain obscuration over windward Kauai, Oahu, Molokai, Maui and Big Island. Improving conditions are expected later this morning, with conditions potentially deteriorating again this afternoon.
AIRMET Tango remains in effect for low level turbulence over and downwind of the terrain of all islands. Little change is expected during the next couple days.
AIRMET Tango is also in effect for strong surface winds over the Kohala region of the Big Island.

Marine

A 1045 mb strong high pressure north of the islands continues to support strong to gale-force easterly trade winds across the coastal waters. The high is expected to weaken as it drifts south then east over the next few days. Despite the weakening high pressure, the gradient will still remain fairly tight over the island chain as the high inches closer to the state. This will continue to support strong to gale- force easterly trade winds through tonight. The Gale Warning for windier waters around Maui and the Big Island has been extended through tonight. Similarly the Small Craft Advisory (SCA) for all other waters has been extended through Saturday for the combination of strong winds and high seas. Trades are expected to ease Saturday as the high weakens and tracks east, however lingering strong winds and high seas may still support SCA conditions for all or most zones Saturday night into Sunday. Winds will continue to decline early next week as the weakening high tracks farther east. The SCA may be dropped altogether by late Monday.
Large, trade wind generated seas will continue to prevail into this weekend. The High Surf Advisory for all exposed east facing shores has been extended through Saturday. As trade winds gradually ease near and upstream of the state, the rough east shore surf will gradually decline. The trade wind swell is expected to fall to around April average Monday or Tuesday. Additionally, a small medium- period north- northeast swell mixed in with the trade wind swell will continue to fade early this morning. Thus, surf heights along north- facing shores drop a notch by this afternoon. For southern shores, small pulses of medium period south- southeast swell and long period southwest swell may arrive this weekend, though surf along south- facing shores will remain small throughout the next several days.

Fire weather

Long-term conditions over leeward areas are drier than normal for this time of year. Though the Keetch-Byram Drought Index, measured in Honolulu, will remain well below the critical 600 mark this week, the strong and gusty trade winds will elevate the fire danger over the drier leeward areas through this afternoon.

HFO Watches/Warnings/Advisories

Wind Advisory until 6 PM HST this evening for windier areas of each island.
High Surf Advisory until 6 PM HST Saturday for exposed east facing shores.
High Wind Warning until 6 PM HST this evening for Leeward Kohala.
Small Craft Advisory until 6 PM HST Saturday for all Hawaiian Coastal Waters outside of the Gale Warning areas.
Gale Warning until 6 AM HST Saturday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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Data Courtesy of NOAA.gov