Southwest winds again exceeded high wind criteria over the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii. No significant property damage or injuries were reported.
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The episode as NWS HFO wrote it up.
Southwest winds again exceeded high wind criteria over the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii. No significant property damage or injuries were reported.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Honolulu, HI wrote its last area forecast discussion before the first event at Apr 29, 9:47 AM HST, 5 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service Honolulu HI 947 AM HST Sun Apr 29 2018 .SYNOPSIS... A weak front will remain stalled just east of the Big Island during the next couple of days. Residual moisture along the old front will linger over the Big Island, and creep slowly back to the northwest across Maui County through Tuesday, while a drier airmass prevails over the rest of the state. Winds will generally be light and favoring a northerly direction, with daytime sea breezes and nighttime land breezes expected over many areas. An unsettled weather pattern is setting up for the middle and later part of the upcoming week over the state, as another upper trough digs down west of the area and deep moisture increases over the islands. && .DISCUSSION... A weakening front lies offshore to the east of the Big Island this morning, while a cooler and drier airmass has spread over most of the state in the wake of the front. Dewpoints are down well into the 50s with only a couple of rain gages reporting light rainfall amounts from Molokai westward since last night. The 12Z Lihue sounding continues to show a very dry and stable airmass in place behind the front, with precipitable water (PW) of only 0.59 inches and a very strong inversion based at 5500 feet. Meanwhile the 12Z Hilo sounding reflects the shallow cold front passage, with a frontal inversion near 4000 feet but still high PW of 1.62 inches. Satellite shows a bit more moisture and cloud cover is observed across Maui and the Big Island this morning. Most of the showers along the front remain around 100 miles east of the Big Island. A nearly stacked low is located about 700 miles north of the state, lifting away to the north. High clouds continue to stream over the eastern parts of the state due to the subtropical jet wrapping around the low. Winds on the Big Island summits have decreased slightly during the last few hours, but remain near advisory levels. Mid-level winds are forecast to increase tonight and Monday, and summit winds may reach warning levels during this time. Cloudy skies with possible scattered showers may continue over the Big Island today, while a dry pattern prevails over the rest of the state. A rather cool airmass for late April, with dewpoints in the 50s, will provide comfortable conditions. Weakening north winds will allow sea breezes to develop over many areas this afternoon. Clouds should remain fairly abundant under the strong inversion, but expect little if any rainfall outside of the Big Island. Tonight through Tuesday, the deeper moisture along the stalled front will creep slowly to the northwest into Maui County, while the dry airmass remains over Oahu and Kauai. Winds will remain rather light during this time with a land and sea breeze pattern prevailing. Scattered to numerous showers are expected over the Big Island and eventually Maui County, while Oahu and Kauai remain mostly dry, with just a few showers possible over interior areas each afternoon. A wet and unsettled weather pattern appears to be in store for the middle and later parts of the upcoming week. Yet another mid/upper level trough is forecast to dig down west of the area. This will bring lingering moisture associated with the old frontal boundary back to the northwest over the islands, while additional deep tropical moisture gets drawn up from the south ahead of the trough. This will bring increasing rain chances to much of the state, with the potential for heavy downpours and possibly some thunderstorms. Currently, models are pointing toward the greatest threat for adverse weather across the central and western islands from Wednesday through early Friday, but it is too early to have high confidence in this forecast, and details on timing, location and rainfall intensities will need to be fine tuned during the next few days. && .AVIATION... A low about 600 nm N of Oahu is forecast to move N over the next 24 hours. A front extends NE from 120 nm E of the Big Island of Hawaii. The front is expected to move W slowly through Monday and maintain widespread MVFR ceilings and visibilities over the Big Island. AIRMET SIERRA is in effect for MTN OBSC on the Big Island. The AIRMET is likely to continue through Monday. VFR will prevail elsewhere over the main Hawaiian islands, but gentle NW winds from Maui to Niihau will push bands of stable low clouds over the islands and may produce MTN OBSC from time to time. && .MARINE... The current north-northwest swell has arrived at the near shore buoys above the original expectations. The swell and associated grids were modified earlier to adjust. The Small Craft Advisory (SCA) has been expanded to additional areas exposed to this swell, with seas in excess of 10 ft reaching further down the island chain. Winds are expected to remain below SCA levels through midweek. This swell is expected to peak tonight, and then begin trending down. A High Surf Warning remains posted for exposed shores of Kauai, with a High Surf Advisory for Oahu, Molokai and Maui. Expected surf to drop to advisory levels for the smaller islands tomorrow, and below advisory levels by tomorrow night. A new south-southwest swell from recent activity near New Zealand is expected to arrive today, which will bring rising surf along south facing shores. See the latest Oahu Surf Discussion (SRDHFO) for additional details on surf and swell. && .HFO WATCHES/WARNINGS/ADVISORIES... High Surf Advisory until 6 AM HST Monday for north and west facing shores of Oahu, Molokai and for north facing shores of Maui. High Surf Warning until 6 AM HST Monday for north and west facing shores of Niihau and Kauai. Wind Advisory until 6 AM HST Tuesday for Big Island Summits. Small Craft Advisory until 6 AM HST Monday for all Hawaiian Coatal Waters except for Maalaea Bay. && DISCUSSION...Foster AVIATION...Donaldson MARINE...M Ballard
The national radar mosaic for the moment the first event began.
1 high wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Hawaii in 2018Every state in 2018This day in weather historyWarnings in Hawaii, April 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 743336.