Waipio, Hawaii 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

258
FXHW60 PHFO 250609
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
809 PM HST Tue Mar 24 2026

.SYNOPSIS...

Lingering moisture, combined with a departing upper trough, will
support periods of locally heavy showers and storms through
tonight over the Big Island. Otherwise, trades have returned, and
a drier and more stable trade wind pattern is expected through
the weekend and into early next week. Showers, mainly windward,
will be with us through the period.

&&

.SHORT TERM UPDATE...

No changes made. Previous forecast remains on track.

&&

.PREV DISCUSSION...
Issued at 355 PM HST Tue Mar 24 2026

An exiting upper level trough still has cold air aloft, and will
keep conditions unstable over the Big Island through tonight.
This lead to an extension of the flood watch there through 6 AM
HST Wednesday. Windward and high elevation showers have been
occurring since late morning, and will continue and strengthen
going into tonight. Therefore flash floods are still possible and
folks should be prepared the rest of tonight.

For the remaining islands, trades have already built back into
the area thanks to a surface high to our north. NE winds averaging
10 to 20 mph with gusts above 30 mph at times were transporting
drier air into the region. Windward showers, typical for trade
winds, will be with us through the weekend and into next week.

An upper low will swing by to the northeast of the state and push
a fairly dry cold front through Thursday night through Saturday
night, bringing even drier air to the state. At this time, the
forecast is for dewpoints in the mid 50s Saturday night, with
upper 50s both Friday and Sunday nights. Looks like a cool weekend
is in store.

&&

.AVIATION...

A persistent convergent low-level cloud band over and upstream of
the windward Big Island slopes supports showery conditions
continuing into Wednesday. Expect periods of MVFR CIGS/VSBYS in
showers moving through, particularly in Hilo, where AIRMET Sierra
for mountain obscuration remains in place. Elsewhere, mostly dry
and breezy northeast trade wind conditions prevail across the
island chain.

AIRMET Tango will remain in effect through Wednesday for low-
level turbulence across leeward areas of all islands due to the
breezy northeast trades.

&&

.MARINE...
Issued at 355 PM HST Tue Mar 24 2026

A trough east of the islands will be the focal point for a new
weak low to develop tonight. This, combined with high pressure
far north of the area, will result in strengthening northeasterly
winds across the local nearshore waters tonight. A Small Craft
Advisory remains in effect for all coastal waters through
Wednesday morning due to these increasing northeasterlies. Winds
begin to ease on Wednesday, but favored channels and coastal
waters around the Big Island will maintain Small Craft Advisory
conditions at least through Wednesday evening. Winds gradually
diminish through the rest of the week as the weak low lifts
northward away from the islands and the high pressure shifts
toward the mainland. A new high pressure develops far northwest of
Hawaii late this week, but strengthens and dips south this
weekend, leading to trade winds likely strengthening back to small
craft criteria into the beginning of next week.

A fading north-northwest swell will be overlapped by a reinforcing
pulse of short to medium period north-northeast swell which will peak
tonight and then decline Wednesday. The forerunners of another small
northwest swell will arrive on Wednesday, with the medium period swell
building to a peak on Thursday, before gradually declining through
the weekend. For east facing shores, short period energy from
rebuilding trades will increase to near seasonal averages tonight
and then hold into the weekend. Strengthening northeasterly winds
this weekend and potential gales associated with a low around one
thousand miles northeast of the islands will lead to the potential
for high surf along north and east facing shores by Sunday into
early next week.

For south facing shores, small pulses of southerly swell continue
to be possible through the rest of the week, which will keep
small surf ongoing along south facing shores.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
Flood Watch until 6 AM HST Wednesday for Big Island East-Big
Island Interior-Big Island North-Big Island South-Big Island
Southeast-Kohala-Kona.

Small Craft Advisory until 6 AM HST Wednesday for Kaiwi Channel-
Kauai Channel-Kauai Leeward Waters-Kauai Northwest Waters-Kauai
Windward Waters-Maui County Windward Waters-Oahu Leeward Waters-
Oahu Windward Waters.

Small Craft Advisory until 6 PM HST Wednesday for Alenuihaha
Channel-Big Island Leeward Waters-Big Island Southeast Waters-
Big Island Windward Waters-Maalaea Bay-Maui County Leeward
Waters-Pailolo Channel.


&&

$$

UPDATE...Walsh
DISCUSSION...Parker
AVIATION...Gibbs
MARINE...Quesada