Southwest winds over the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii increased beyond the high wind threshold. No serious injuries or property damage were reported.
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The episode as NWS HFO wrote it up.
Southwest winds over the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii increased beyond the high wind threshold. No serious injuries or property damage 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 2, 4:02 AM HST, 3 hours 37 minutes earlier.
Area Forecast Discussion National Weather Service Honolulu HI 402 AM HST Mon Apr 2 2018 .SYNOPSIS... A wet weather pattern will develop this week across the Hawaiian Islands as several low pressure systems track across the state. Humid and Voggy south to southwesterly winds will continue through Thursday. The first trough will move into the islands from the west this morning producing showers over Kauai and Oahu, this system will spread clouds and showers down the island chain to Maui County later this afternoon. A second trough brings showers across the islands from west to east starting on Wednesday morning. Deep moisture will continue to hang over the islands through the week with a weak cold front sweeping a third round of showers through the state on Thursday and Friday. Trade winds return on Saturday in a continued humid and cloudy weather pattern. && .DISCUSSION... The Water Vapor satellite imagery this morning shows an extensive band of mid and high clouds from a strong jet stream spreading across the islands from west to east. An upper level trough is approaching Hawaii from the northwest. Local doppler radar shows showers already developing just west of Niihau and Kauai, with some showers moving into the Waianae Coast of Oahu. Shower activity will increase and spread eastward through the morning hours as the upper level trough moves over Kauai. In the big picture, the East Pacific high remains locked in place off the California coast as a broad area of low pressure moves through the Central Pacific. A slow moving cold front lingers between these two air masses dragging a nearly stationary remnant frontal boundary just northwest of the Hawaiian Islands. Meanwhile tropical moisture with voggy kona winds persists over the entire state. A complicated wet weather pattern will develop through the work week with several upper level short wave troughs passing west to east through the region. These upper troughs will cause weak lows to develop along the remnant front, lifting clouds and showers across each island as they pass. Today and Tuesday...The first in a series of troughs moves into Kauai from the northwest this morning with upper level forcing spreading clouds and showers eastward over Kauai and Oahu. The trough continues to push showers eastward into Maui County by Monday afternoon with enhanced showers reaching the Big Island on Tuesday. Upper level wind speeds will increase this morning over the Big Island summits of Maunaloa and Maunakea as the trough approaches from the west. A wind advisory was issued this morning for both summits. Wednesday through Friday...Meanwhile far to the west of the islands, a second stronger trough moves into the picture passing through Kauai and Oahu on Wednesday morning. On Thursday, a high pressure system moving across the Central Pacific will help push a band of clouds and showers across Maui and Hawaii Counties through Friday. The long range outlook for next weekend still appears humid and cloudy as a surface trough will linger over the state. Weather model guidance continues to show kona winds replaced by trade winds on Saturday. These winds will be strong enough to blow all the Volcanic fOG (VOG) away from the smaller islands. Another round of showers is possible from Kauai to Maui this weekend. The timing on precipitation impacts for each island remains challenging in a complicated weather pattern. The American (GFS) global weather model and the European (ECMWF) model solutions are improving with the track and timing of precipitation impacts from these upper troughs. Overall we expect periods of moderate to locally heavy rainfall through the upcoming work week. Significant adjustments to precipitation chances were made with the morning forecast grid package. Short term precipitation forecasts were created from a blend of larger scale and smaller mesoscale model rainfall solutions. Stay tuned for forecast updates this week as the weather pattern evolves over time. && .AVIATION... Moisture associated with a weak frontal boundary just northwest of Kauai will advance to the western islands today. Southerly winds are expected to increase a bit across the islands as well, bringing more moisture from the south. Thus, more widespread MVFR ceiling showers conditions as well as isolated IFR conditions will affect Kauai early today, then spreading east to Oahu later. This may prompt the issuance of AIRMET mountain obscuration for those islands. Rest of the islands will see mainly VFR conditions early today, though increasing moisture from the south coupled with daytime heating may bring some MVFR ceiling conditions to those islands. An AIRMET for upper level TEMPO moderate turbulence has been canceled. The non-standard AIRMET for TEMPO light icing remains in effect across the area between 160 and FL250 due to the present of upper level moisture. && .MARINE... Light to moderate southerly winds are forecast to shift out of the south-southwest Tuesday through midweek and increase into the fresh to strong category as low pressure develops and lifts northeast, potentially dragging a cold front into the area by late Thursday. The best chance for heavy showers will remain over the northwest waters today due to a lingering frontal boundary positioned northwest of the state. More of a widespread rainfall threat will become a possibility Tuesday through the second half of the week as the front begins to advance down the island chain. The anomalous pattern across the northern Pacific that has suppressed our more typical swell energy from the northwest direction since the second half of February has begun to shift. The ridge over the northwest Pacific has broken down, which has allowed the storm track to shift eastward. The latest model guidance reflects this and depicts a series of gales setting up over the northwest Pacific through the week that will bring consistent surf out of the northwest (310-330 deg) to our north and west facing shores through the upcoming weekend and next week. The current west-northwest (300 deg) swell that brought advisory- level surf to exposed north and west facing shores early Saturday will continue to slowly ease through Tuesday. A small reinforcement out of the same direction associated with a gale tracking eastward north of Midway around 30 to 35N this morning is forecast to fill in locally Wednesday through Thursday. Another gale is forecast to develop between 35N and 40N just east of the date line Wednesday as it tracks southeastward aiming seas at the local area out of 330 deg. Surf will respond from this source Friday and persist through the weekend. Choppy and short period surf along south facing shores will become a possibility Tuesday through midweek as fresh to strong south-southwest setup over the state. For the long term (Sunday night into next week), guidance remains persistent and depicts a large area of gale- to storm-force westerly winds developing over the far northwest Pacific near the western Aleutians south of 967 mb low pressure Thursday through Friday. ECMWF-Wave and WAVEWATCH III solutions are similar and show a large NNW (330-340 deg) swell hitting our NW offshore buoys Sunday night. If this scenario evolves as predicted, warning level surf will become a possibility along north and west facing shores early next week. && .HFO WATCHES/WARNINGS/ADVISORIES... Wind Advisory from 11 AM this morning to 5 AM HST Tuesday for Big Island Summits. && DISCUSSION...Bohlin AVIATION...Hui MARINE...Lau
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: 741603.