Today: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to around 72 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.
Tonight: Mostly cloudy. Numerous showers in the evening, then frequent showers after midnight. Lows around 67 near the shore to around 53 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 80 percent.
Tuesday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to around 72 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.
Kona
Today: Mostly sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 83 to 88 near the shore to around 70 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.
Tonight: Mostly cloudy in the evening then becoming partly cloudy. Isolated showers. Lows 68 to 74 near the shore to around 54 near 5000 feet. Light winds. Chance of rain 20 percent.
ARTICLE CONTINUES BELOW AD
ARTICLE CONTINUES BELOW AD
Tuesday: Mostly sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 83 to 88 near the shore to around 70 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.
Waimea
Today: Partly sunny. Windy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 82 near the shore to 70 to 80 near 3000 feet. East winds 10 to 30 mph. Chance of rain 70 percent.
Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 67 near the shore to 55 to 61 near 3000 feet. East winds 10 to 25 mph decreasing to up to 25 mph after midnight. Chance of rain 50 percent.
Tuesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 82 near the shore to 70 to 80 near 3000 feet. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 70 percent.
Kohala
Today: Partly sunny. Windy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 82 near the shore to 70 to 80 near 3000 feet. East winds 10 to 30 mph. Chance of rain 70 percent.
ARTICLE CONTINUES BELOW AD
Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 67 near the shore to 55 to 61 near 3000 feet. East winds 10 to 25 mph decreasing to up to 25 mph after midnight. Chance of rain 50 percent.
Tuesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 82 near the shore to 70 to 80 near 3000 feet. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 70 percent.
South Big Island
Today: Breezy. Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 87 near the shore to around 74 near 5000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.
Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Lows around 69 near the shore to around 52 near 5000 feet. Northeast winds 10 to 20 mph. Chance of rain 20 percent.
Tuesday: Breezy. Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 87 near the shore to around 74 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.
Puna
ARTICLE CONTINUES BELOW AD
Today: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to around 72 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.
Tonight: Mostly cloudy. Numerous showers in the evening, then frequent showers after midnight. Lows around 67 near the shore to around 53 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 80 percent.
Tuesday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to around 72 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.
Waikoloa
Today: Sunny in the morning then becoming partly sunny. Windy. Highs around 87 near the shore to 71 to 77 above 4000 feet. Northeast winds up to 30 mph.
Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Lows 69 to 74 near the shore to 50 to 57 above 4000 feet. Southeast winds up to 20 mph. Chance of rain 20 percent.
Tuesday: Sunny in the morning then becoming partly sunny. Breezy. Highs around 87 near the shore to 71 to 77 above 4000 feet. Northeast winds up to 25 mph.
Detailed Forecast
Synopsis
The gusty easterly trade winds will continue into Tuesday, then ease slightly Tuesday night through the second half of the week. As areas of moisture move through, showers will be common over windward and mauka locations, while only a few make it over our drier leeward areas.
Discussion
The surface ridge located to our north will remain strong through the start of the week, which supports the gusty easterly trades holding. An area of moisture moving through this morning has led to frequent showers over windward and mauka locations. Some of these have made it into our leeward areas overnight, likely due to the slight increase in the trade inversion (Hilo upper air sounding up to around 9000 ft). Expect this trend to continue through the morning hours. Near-term guidance shows another area of enhanced moisture approaching and clipping the western end of the state Tuesday through Wednesday, which will keep the rainfall chances in the forecast, especially overnight through morning hours for windward/mauka locations. Thereafter, a slight weakness forming in the ridge to the north will translate to our strong trades easing into the moderate to breezy range beginning around or by Wednesday. Stable conditions aloft combined with plenty of mid-level dry air and the lighter trades will lead to the shower distribution and frequency for windward areas decreasing slightly.
Aviation
Moderate to locally breezy trade winds will continue through twenty-four hours and beyond. AIRMET Tango for moderate low level turbulence over and downwind of the terrain will remain in effect for all islands.
Low clouds and showers will favor north through east sections of the islands as bands of moisture move through from time to time. Brief periods of MVFR ceilings and visibilities are possible within any showers that occur, but VFR conditions are expected to prevail most areas today.
As of 2 am Monday, radar indicated active showers moving through Oahu and just upstream of Molokai and Oahu. AIRMET Sierra for mountain obscuration has been reissued for windward Oahu. Conditions are expected to end on Oahu later this morning but will likely redevelop late this evening. Mountain obscuration could also become an issue for windward Big Island this evening.
Marine
Surface high pressure far northeast of the islands will remain nearly stationary the next couple of days, weakening slightly around midweek. Strong to near-gale force trade winds continue, as does a Small Craft Advisory (SCA) for all waters. A slight decrease in wind speeds tonight may allow some zones to be removed from the SCA. A return to SCA over typical windy zones around Maui County and the Big Island is expected around midweek.
The current south-southeast swell is gradually diminishing, as another pulse of south-southeast swell is expected to bring south facing shores back into High Surf Advisory Criteria later today through Tuesday. Observations at the offshore buoys have shown an increase in the long period bands as reinforcements are expected to build later today. Surf along south shores will return to the summertime average (or lower) later in the week.
Nearshore PacIOOS Mokapu buoy shows that combined seas leveled off near 8 feet. Surf along east facing shores will remain rough and choppy with short-period wind waves due to the strong trades before easing slightly. A small NNW swell will bring some small surf to N facing shores the next couple of days, with some trade wind swell also wrapping into exposed locations.
HFO Watches/Warnings/Advisories
High Surf Advisory until 6 PM HST Tuesday for all south facing shores.
Small Craft Advisory until 6 PM HST this evening for Kauai Northwest Waters, Kauai Windward Waters, Kauai Leeward Waters, Kauai Channel, Oahu Windward Waters, Maui County Leeward Waters, Big Island Windward Waters.
Small Craft Advisory until 6 PM HST Tuesday for Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
This comments section is a public community forum for the purpose of free expression. Although Big Island Now encourages respectful communication only, some content may be considered offensive. Please view at your own discretion. View Comments
