Ashfall Warning 3, NWS Honolulu, HI

330 
WWHW70 PHFO 100118
NPWHFO

URGENT - WEATHER MESSAGE
National Weather Service Honolulu HI
318 PM HST Thu Apr 9 2026

HIZ004-029-101430-
/O.CON.PHFO.HW.W.0007.000000T0000Z-260410T1600Z/
Kauai Mountains-Kauai North-
318 PM HST Thu Apr 9 2026

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY...

* WHAT...South winds 25 to 35 mph with gusts up to 60 mph expected.

* WHERE...Kauai Mountains and Kauai North.

* WHEN...Until 6 AM HST Friday.

* IMPACTS...Damaging winds may blow down trees and power lines and 
  damage roofs. Power outages are possible. Travel will be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong winds may lead to property damage. Hazardous driving 
conditions due to powerful cross winds will pose a serious risk for 
drivers, especially for light weight and high profile vehicles. 
Loose outdoor items should be brought inside or secured properly.

&&

$$

HIZ007-009>011-035-036-101430-
/O.CON.PHFO.HW.W.0007.000000T0000Z-260410T1600Z/
Oahu North Shore-Olomana-Central Oahu-Waianae Mountains-Koolau
Windward-Koolau Leeward-
318 PM HST Thu Apr 9 2026

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY...

* WHAT...South winds 20 to 30 mph with gusts up to 60 mph possible.

* WHERE...Central Oahu, Koolau Leeward, Koolau Windward, Oahu North 
  Shore, Olomana, and Waianae Mountains.

* WHEN...Until 6 AM HST Friday.

* IMPACTS...Damaging winds may blow down trees and power lines and 
  damage roofs. Power outages are possible. Travel will be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong winds may lead to property damage. Hazardous driving 
conditions due to powerful cross winds will pose a serious risk for 
drivers, especially for light weight and high profile vehicles. 
Loose outdoor items should be brought inside or secured properly.

&&

$$

HIZ027-052-053-101000-
/O.CON.PHFO.AF.W.0003.000000T0000Z-260410T1000Z/
Big Island Interior-Big Island Southeast-Big Island East-
318 PM HST Thu Apr 9 2026

...ASHFALL WARNING REMAINS IN EFFECT UNTIL MIDNIGHT HST TONIGHT...

* WHAT...Kilauea is undergoing an episodic fountaining eruption 
  within the summit caldera. Fountaining episodes typically last 
  less than 12 hours but ash can remain in the air longer depending 
  on wind and weather conditions.

* WHERE...Big Island East, Big Island Interior, and Big Island 
  Southeast.

* WHEN...Until midnight HST tonight.

* IMPACTS...The public may be impacted by substantial tephra fall. 
  Varying levels of ash, Pele's hair and other lightweight tephra 
  may fall downwind of the eruption. Large foam-like tephra up to 
  football size may fall near the summit and up to several miles 
  downwind. Small particles are eye and respiratory irritants. 
  Larger lightweight tephra are not usually harmful on impact, but 
  they can reduce visibility, create hazardous driving conditions, 
  and need localized clean-up. This lightweight material does not 
  pose a roof-collapse risk.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain indoors and avoid driving during tephra fall if possible. 
Limit exposure to tephra, especially if you have respiratory 
sensitivities. Wear a face mask if you must go outside. Cover and 
disconnect your water catchment system to protect your water supply. 
Wear a mask, gloves, eye protection, and long clothing when clearing 
tephra.

Follow all guidance from the National Park Service and the County of 
Hawaii. Hawaii Volcanoes National Park is closed and Highway 11 is
closed except for local traffic between mile markers 24 and 40. Be 
aware that additional closures may occur.

Smaller particles can travel farther from the eruption site. Areas 
farther downwind to the north and northeast, including Puna, North
and South Hilo, and Hamakua Districts, may experience ash and Pele's 
hair.

&&

Submit your reports and photos of ashfall from volcanic eruptions to 
the USGS Hawaiian Volcano Observatory at:

  Hawaiiash.science/report_form

$$

HIZ028-101430-
/O.CON.PHFO.WI.Y.0013.000000T0000Z-260411T0400Z/
Big Island Summits-
318 PM HST Thu Apr 9 2026

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST FRIDAY...

* WHAT...Southwest winds 40 to 50 mph with gusts to around 60 mph 
  expected.

* WHERE...Big Island Summits.

* WHEN...Until 6 PM HST Friday.

* IMPACTS...Winds this strong can make driving and walking 
  dangerous. The winds can forcefully open doors and damage hinges 
  or slam doors shut, possibly causing injuries.

$$

VAUGHAN

551 
WWHW70 PHFO 100556
NPWHFO

URGENT - WEATHER MESSAGE
National Weather Service Honolulu HI
756 PM HST Thu Apr 9 2026

HIZ027-052-053-100700-
/O.CAN.PHFO.AF.W.0003.000000T0000Z-260410T1000Z/
Big Island Interior-Big Island Southeast-Big Island East-
756 PM HST Thu Apr 9 2026

...ASHFALL WARNING IS CANCELLED...

The threat has ended.

Submit your reports and photos of ashfall from volcanic eruptions to 
the USGS Hawaiian Volcano Observatory at:

  Hawaiiash.science/report_form

$$

HIZ004-029-101600-
/O.CON.PHFO.HW.W.0007.000000T0000Z-260410T1600Z/
Kauai Mountains-Kauai North-
756 PM HST Thu Apr 9 2026

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY...

* WHAT...South winds 25 to 35 mph with gusts up to 60 mph expected.

* WHERE...Kauai Mountains and Kauai North.

* WHEN...Until 6 AM HST Friday.

* IMPACTS...Damaging winds may blow down trees and power lines and 
  damage roofs. Power outages are possible. Travel will be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong winds may lead to property damage. Hazardous driving 
conditions due to powerful cross winds will pose a serious risk for 
drivers, especially for light weight and high profile vehicles. 
Loose outdoor items should be brought inside or secured properly.

&&

$$

HIZ007-009>011-035-036-101600-
/O.CON.PHFO.HW.W.0007.000000T0000Z-260410T1600Z/
Oahu North Shore-Olomana-Central Oahu-Waianae Mountains-Koolau
Windward-Koolau Leeward-
756 PM HST Thu Apr 9 2026

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 6 AM HST FRIDAY...

* WHAT...South winds 20 to 30 mph with gusts up to 60 mph possible.

* WHERE...Central Oahu, Koolau Leeward, Koolau Windward, Oahu North 
  Shore, Olomana, and Waianae Mountains.

* WHEN...Until 6 AM HST Friday.

* IMPACTS...Damaging winds may blow down trees and power lines and 
  damage roofs. Power outages are possible. Travel will be 
  difficult, especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong winds may lead to property damage. Hazardous driving 
conditions due to powerful cross winds will pose a serious risk for 
drivers, especially for light weight and high profile vehicles. 
Loose outdoor items should be brought inside or secured properly.

&&

$$

HIZ028-101900-
/O.CON.PHFO.WI.Y.0013.000000T0000Z-260411T0400Z/
Big Island Summits-
756 PM HST Thu Apr 9 2026

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST FRIDAY...

* WHAT...Southwest winds 40 to 50 mph with gusts to around 60 mph 
  expected.

* WHERE...Big Island Summits.

* WHEN...Until 6 PM HST Friday.

* IMPACTS...Winds this strong can make driving and walking 
  dangerous. The winds can forcefully open doors and damage hinges 
  or slam doors shut, possibly causing injuries.

$$

ALMANZA

Area Forecast Discussion
National Weather Service Honolulu HI
958 AM HST Thu Apr 9 2026

.SYNOPSIS...
An increasingly active weather pattern unfolding across the
Hawaiian Islands will persist through Friday as low pressure
strengthens northwest of the state. Deep tropical moisture being
drawn northward into the islands will support periods of heavy
rainfall, strong southerly winds, isolated strong to severe
thunderstorms through Friday. Although some brief improvement for
portions of the state is possible by Saturday, another active
period appears possible from Sunday through early next week.

&&

.SHORT TERM UPDATE...
Issued at 918 AM HST Thu Apr 9 2026

The forecast remains largely on track with no major changes this
morning. Latest radar imagery shows that showers have increased
across Kauai since sunrise, and additional rounds of heavier
showers are anticipated throughout the day. The 18 UTC special
sounding from Lihue reflects this, with an increase in instability
and precipitable water values now at the 2.0 inch mark. Anticipate
flooding concerns to significantly increase throughout the day
for Kauai in particular as rain rates become more intense,
thunderstorms begin moving into the western part of the state, and
potential training occurs over certain areas or basins. By this
evening and tonight, heavier shower bands are anticipated for Oahu
as well, continuing into early Friday with the main focus of
heavy rain and thunderstorms then shifting to the central and
eastern islands on Friday.

As the previous discussion mentioned, strong downsloping winds
will be a concern across the western islands today, as guidance
indicates southerly winds of 40+ kts at 925mb. This will create
strong gusts in areas north and downwind of steep terrain, and we
have already observed at least one high wind warning-level gust on
Oahu this morning. The stronger southerly winds will shift farther
east to mainly Maui County and areas around the Big Island by
Friday afternoon, with much lighter winds statewide this weekend.

&&

.PREV DISCUSSION...
Issued at 346 AM HST Thu Apr 9 2026

Forecast confidence continues to increase in a high-impact
weather event evolving across the state today through Friday, with
the primary concerns being heavy rainfall capable of producing
flash flooding, strong southerly winds, and strong to severe
thunderstorms.

Model guidance remains in good agreement depicting a deep upper
trough and embedded shortwave energy digging southeastward toward
the islands while surface low pressure deepens northwest of the
state. As this system strengthens, the local pressure gradient
will quickly tighten through the day, resulting in increasingly
strong south to southeast winds across the island chain.

This flow will transport a deep tropical moisture plume northward
over the state, with PWs hovering around or above 2 inches.
Combined with increasing large-scale ascent and strengthening low-
level convergence, conditions favor widespread and organized
heavy rainfall and isolated strong to severe thunderstorms
(despite the best instability remaining off to the northwest).

The greatest rainfall impacts will most likely begin over Kauai
and Oahu today before spreading eastward across the remainder of
the state tonight through Friday. Confidence remains highest
across the western end of the island chain for the most
significant rainfall totals and flash flooding concerns during the
initial phase of the event.

Wind impacts are also becoming increasingly concerning. Guidance
supports strong and gusty southerly winds across Kauai and Oahu
today through tonight, which has led to an upgrade from the
High Wind Watch to a High Wind Warning for north and east facing
slopes.

Farther east, guidance also indicates gusty southerly winds
across exposed portions of the Big Island during the same time
period. While winds there are not currently expected to reach
warning criteria, speeds may near Wind Advisory thresholds by
later today or Friday, particularly across wind-prone and
terrain-enhanced areas.

For the Big Island summits, gusty winds along with a wintry mix
supports the Winter Weather Advisory and High Wind Advisory into
Friday.

Although forecast confidence decreases somewhat beyond Friday,
some gradual or temporary improvement is anticipated Friday night
into Saturday as upper heights rise and some drier air advances
down the island chain from the west. Guidance, however, shows
another shortwave dipping southeastward into the area late in the
weekend, likely supporting another active weather period across
the state that may extend through early next week.

&&

.AVIATION...
Issued at 918 AM HST Thu Apr 9 2026

Shower activity continues this morning across the islands. Latest
radar imagery shows a broad expanse of showers moving in from the
southwest. A heavier band of showers is expected to move through
Kauai today, spreading eastward across the islands through the
overnight hours heading into Friday. With this band, gusty winds
from the south will occur, making for periods of IFR or worse
conditions under heavy showers and even isolated thunderstorms.
Preceding the heavier rain band, expect MVFR conditions as light
rain and low ceilings prevail across the islands.

AIRMET Sierra remains in effect for mountain obscuration above
020 ft across all islands. Some relief is possible as showers
decrease in coverage this morning, but confidence in exact timing
is low, so expect Sierra to persist through the TAF period.

AIRMET Tango also is in effect for moderate turbulence between
FL200 and FL350 across the entire islands, and for moderate
turbulence downwind of terrain for Oahu and Kauai. This is also
expected to remain in effect through the TAF period.

AIRMET Zulu is also in effect for moderate icing between 140-FL200
as this ongoing weather pattern envelops the islands with
extensive cloud cover. Expect this to remain in effect through the
period as well.

&&

.MARINE...
Issued at 346 AM HST Thu Apr 9 2026

South to southeast winds are expected to steadily increase
to strong to gale force speeds later this morning through
tonight, as a low pressure system develops just west of the state
and lifts northward. A Gale Warning has been issued for the
western half of the coastal waters and the offshore waters due to
the strengthening winds today. Small Craft Advisory (SCA) is in
effect for most of the remaining waters for today.

For tonight, Gales are expected to continue over the western half
of the coastal waters through the first half of the night then
gradually shift eastward throughout the night. A Gale Watch
remains in effect for the eastern half of the coastal waters. As
the low pressure system further deepens today into Friday, we
will likely see a greater coverage of thunderstorms and gusty
winds especially tonight into Friday, where we could potentially
see severe thunderstorms over the coastal waters capable of
producing waterspouts and damaging winds. Very rough boating
conditions are also expected later today into Friday as seas
quickly rise in response to the strong to gale force winds. South
facing harbor entrances will also be greatly impacted due to rough
conditions.

The current south swell that peaked during the day yesterday has
dropped below advisory thresholds this morning. But due to the
strong to gale force southerly winds that are expected to quickly
develop today over the western half of the state, a High Surf
Advisory remains in effect for Kauai County and Oahu through
tonight. Large disorganized surf is expected along south facing
shores of Kauai and Oahu through at least tonight. Depending on
how the low pressure system evolves today, the High Surf Advisory
may need to be expanded towards Maui County tonight.

Along north facing shores, a moderate long-period northwest
(310-320 degree) swell peaked during the day yesterday and will
steadily lower today and dissipate to background levels on Friday.
However a smaller short-period northwest swell generated by the
low developing just west of us will fill in over the weekend into
early next week.

Surf along east facing shores could see an increase later this
week due to the strengthening southeasterly winds especially for
southeast exposures.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Flood Watch through Friday afternoon for all Hawaiian islands.

High Surf Advisory until 6 AM HST Friday for East Honolulu-Ewa
Plain-Honolulu Metro-Kauai South-Kauai Southwest-Niihau-Waianae
Coast.

High Wind Warning until 6 AM HST Friday for Central Oahu-Kauai
Mountains-Kauai North-Koolau Leeward-Koolau Windward-Oahu North
Shore-Olomana-Waianae Mountains.

Winter Weather Advisory until 6 AM HST Friday for Big Island
Summits.

Wind Advisory until 6 PM HST Friday for Big Island Summits.

Gale Warning until 6 AM HST Friday for Kauai Channel-Kauai
Leeward Waters-Kauai Northwest Waters-Kauai Windward Waters-Oahu
Leeward Waters-Oahu Windward Waters.

Small Craft Advisory until 6 PM HST this evening for Alenuihaha
Channel-Big Island Leeward Waters-Big Island Southeast Waters-
Big Island Windward Waters-Kaiwi Channel-Maui County Leeward
Waters-Maui County Windward Waters.

Gale Watch from 6 PM HST this evening through Friday afternoon
for Alenuihaha Channel-Big Island Leeward Waters-Big Island
Southeast Waters-Big Island Windward Waters-Kaiwi Channel-
Maalaea Bay-Maui County Leeward Waters-Maui County Windward
Waters-Pailolo Channel.

&&

SHORT TERM UPDATE...Vaughan
DISCUSSION...Gibbs
AVIATION...DT
MARINE...Kino

Preliminary Local Storm Report
National Weather Service Honolulu HI
658 AM HST Thu Apr 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0648 AM     Non-Tstm Wnd Gst 4 NW Schofield Barracks 21.53N 158.11W
04/09/2026  M69 MPH          Honolulu           HI   Mesonet

            Kamananui.

&&

JVC

Special Weather Statement
National Weather Service Honolulu HI
1119 AM HST Thu Apr 9 2026

HIZ023-026>028-051>054-100030-
Kona-Kohala-Big Island Interior-Big Island Summits-
Big Island South-Big Island Southeast-Big Island East-
Big Island North-
1119 AM HST Thu Apr 9 2026

...KILAUEA EPISODE 44 LAVA FOUNTAINING BEGAN TODAY AT 1110 AM
HST...

WHAT...Kilauea is undergoing an episodic fountaining eruption
within the summit caldera. Fountaining episodes typically last
less than 12 hours but ash can remain in the air longer depending
on wind and weather conditions.

IMPACTS...Varying levels of ash, Pele's hair, and other
lightweight tephra may fall downwind of the eruption. In the
current weather pattern, "downwind" will be to the north and
northeast of the summit, including the communities of Volcano and
Mountain View. Smaller particles can travel farther from the
eruption site and may affect communities at greater distances.

PRECAUTIONARY/PREPAREDNESS ACTIONS...
If you live downwind of the Kilauea summit, or plan to visit the
summit area, stay informed about current volcanic activity and
weather conditions. Winds from the south mean that tephra could
fall in areas of Hawaii Volcanoes National Park, on Highway 11
nearby, and in communities near the Kilauea summit region.

Consider covering and temporarily disconnecting your water
catchment system. Be prepared with eye and respiratory protection
and be ready to shelter in place if necessarily.

Follow all guidance from the National Park Service and the County
of Hawaii. Be aware that road or park closures may occur.

Areas farther downwind to the north and northeast of the Kilauea
summit, including Puna, and North and South Hilo, and Hamakua
Districts, may experience ash and Pele's hair.

This statement will be issued daily and updated as needed.

&&

For more information on the status of Kilauea Volcano, please see
https://volcanoes.usgs.gov/volcanoes/kilauea/volcano-updates

For health and safety recommendations, please visit the Hawaii
Interagency Vog Information Dashboard at https://vog.ivhhn.org

Submit your reports and photos of ashfall from eruptions to the USGS
Hawaiian Volcano Observatory at https://hawaiiash.science/report_form