Middle- to upper-air flow strengthened once again over 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.
Middle- to upper-air flow strengthened once again over 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 Feb 5, 5:07 PM HST, 1 hour 52 minutes earlier.
Area Forecast Discussion National Weather Service Honolulu HI 507 PM HST Mon Feb 5 2018 .UPDATE... We have issued a Wind Advisory for the summits of Mauna Kea and Mauna Loa on the Big Island and updated the forecast for stronger winds there. && .SYNOPSIS... A trough will maintain wet weather over the islands through mid- week. The trough will produce flooding rain and thunderstorms with gusty winds. Fog, ice and snow are possible on the Big Island summits through Wednesday. The weather will turn drier by the end of the week as the trough moves east. More wet weather is possible early next week as a strong new trough moves over the islands. && .DISCUSSION... Our surface analysis for 200 PM shows a north to south front over Oahu. Water vapor imagery shows a strong trough aloft extending from north to south over Kauai. The trough is making the atmosphere unstable, and there is plenty of moisture along the front. Lines of heavy showers and thunderstorms will continue to affect the islands through mid-week. Temperatures are cold on the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii, so snow and ice will be possible there. The trough aloft is forecast to become even deeper as the trough and the front move east at 10 mph. The trough and front will move east of the islands by Thursday and weather over the islands will turn drier. A surface high building north of the area will bring a period of moderate northeasterly trade winds over the weekend. A deep new trough aloft is forecast to dig toward the islands from the northwest early next week. That could bring a new round of wet weather. && .AVIATION... Clouds, showers and thunderstorms have shifted a bit to the east this afternoon impacting the area from Oahu eastward. The main focus has been over the islands of Maui County and Oahu. MVFR and areas of IFR have been observed with the heaviest showers. Expect some of this activity to spread to the Big Island overnight. Meanwhile, conditions have started to improve over Kauai. AIRMET SIERRA continues for mountain obscuration the islands of Maui County and Oahu. Will likely have a need to extend this to portions of the Big Island overnight. SIGMET XRAY continues for thunderstorms over most of the area east of Kauai. Anticipate this SIGMET remaining up through much of the night. Icing remains a possibility in the upper levels, even outside of thunderstorms. Mention of the possibility of icing continues in AIRMET ZULU across the islands and adjacent coastal waters. && .MARINE... A slowly dissipating quasi-stationary front over the islands is keeping a weak pressure gradient and light winds over most of the coastal waters at mid-afternoon. The front will likely weaken to a surface trough and shift slowly E over the next couple of days. Light winds are expected to persist in most of the local marine area through about Wednesday, though some moderate trades are expected in the coastal waters west of Kauai. High pressure will build NW of the islands Wed night, increasing northerlies near Kauai and Oahu first, with fresh trades overspreading the state after that. The trades may reach Small Craft Advisory levels in the typically windy channeled areas around the terrain by the end of the work week. Moist and unstable air associated with the front and a strong trough aloft will maintain the chance for locally higher winds and seas, reduced visibility in localized downpours, and cloud to surface lightning for the next couple of days. Guidance from the Wave Watch III model continues to indicate a new large northwest swell will spread down across the state from late Thursday through Friday. The swell should peak at near warning levels for some N or W facing shores, and will likely result in a SCA due to elevated seas across exposed waters Thursday night and Friday. && .HFO WATCHES/WARNINGS/ADVISORIES... Wind Advisory through 600 AM Wednesday for the summits of Mauna Kea and Mauna Loa on the Big Island of Hawaii. Flash Flood Watch through 600 PM Wednesday for all islands. Winter Storm Watch from Tuesday morning through Wednesday afternoon for Big Island Summits. && DISCUSSION...Donaldson AVIATION...M Ballard MARINE...R Ballard
Special Weather Statement
National Weather Service Honolulu HI
141 PM HST MON FEB 5 2018
HIZ019>022-060030-
Maui Central Valley-Haleakala Summit-Leeward Haleakala-Windward
Haleakala-
141 PM HST MON FEB 5 2018
...A STRONG THUNDERSTORM WILL AFFECT MAUI IN MAUI COUNTY...
At 141 PM HST, a strong thunderstorm was located near Kihei, or 9
miles southeast of Kahului, moving east at 20 mph.
Wind gusts of 50 to 55 mph and nickel size hail are possible with
this storm.
Locations impacted include...
Kihei, Wailea, Ulupalakua, Kula, Pukalani, Makawao, Keokea, Makena,
Maalaea, Kipahulu and Haleakala National Park.
LAT...LON 2065 15645 2073 15645 2076 15647 2083 15648
2089 15619 2086 15615 2063 15614
TIME...MOT...LOC 2341Z 266DEG 16KT 2075 15640
R BallardPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
207 PM HST MON FEB 05 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0150 PM HAIL 4 NNE KEOKEA 20.76N 156.34W
02/05/2018 E0.25 INCH MAUI HI TRAINED SPOTTER
CALLED AT 152PM TO SAY HE HAD PEA SIZED HAIL WITH SOME
STILL ON HIS LAWN. IT HAD STOPPED A MINUTE OR TWO BEFORE
HE CALLED.
&&
MDYEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
248 PM HST MON FEB 05 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0233 PM WATER SPOUT 5 S WAIPAHU 21.32N 158.01W
02/05/2018 HONOLULU HI PUBLIC
OBSERVED WATERSPOUT OFF OF EWA BEACH
&&
MDYESpecial Weather Statement
National Weather Service Honolulu HI
343 PM HST MON FEB 5 2018
HIZ025>027-060230-
Big Island North and East-Kohala-Big Island Interior-
343 PM HST MON FEB 5 2018
...A STRONG THUNDERSTORM WILL AFFECT HAWAII IN HAWAII COUNTY...
At 341 PM HST, a strong thunderstorm was located between Honokaa and
Waimea, or about 33 miles northwest of Hilo. This storm was moving
northeast at 25 mph.
Wind gusts up to 50 mph and dime size hail are possible with this
storm.
Locations that may be affected by this storm include...
Honokaa and Paauilo.
LAT...LON 1996 15523 1988 15554 2004 15562 2011 15549
2011 15546 2001 15526
TIME...MOT...LOC 0141Z 241DEG 21KT 2000 15551
R BallardSpecial Weather Statement
National Weather Service Honolulu HI
459 PM HST MON FEB 5 2018
HIZ025-060330-
Big Island North and East-
459 PM HST MON FEB 5 2018
...A STRONG THUNDERSTORM WILL AFFECT HAWAII IN HAWAII COUNTY...
At 457 PM HST, a strong thunderstorm was located over Kurtistown and
Hawaiian Acres, or 10 miles south of Hilo, moving east at 20 mph.
Wind gusts up to 50 mph and dime size hail are possible with this
storm.
Locations impacted include...
Hawaiian Paradise Park, Hawaiian Acres, Orchidlands Estates, Keaau,
Pahoa, Hawaiian Beaches, Nanawale Estates, Kurtistown, Fern Acres,
Ainaloa and Kapoho.
LAT...LON 1950 15483 1948 15482 1949 15508 1967 15512
1973 15500 1969 15498 1965 15499 1956 15489
1953 15481
TIME...MOT...LOC 0257Z 261DEG 12KT 1958 15506
KodamaThe national radar mosaic for the moment the first event began.
2 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, February 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: 732997, 732998.