AFOS product AFDHFO
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Displaying AFOS PIL: AFDHFO
Product Timestamp: 2022-09-11 13:25 UTC

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FXHW60 PHFO 111325
AFDHFO

Area Forecast Discussion
National Weather Service Honolulu HI
325 AM HST Sun Sep 11 2022

.SYNOPSIS...
The hybrid light trade wind and sea breeze weather pattern will
continue for one more day today. Clouds and slow moving showers 
will favor mountain and island interior sections each afternoon to
early evening, then shift towards windward areas in the overnight
hours. The weather pattern changes on Monday as the high pressure
ridge strengthens north of the region. Trade winds will trend
back to moderate levels by Tuesday, with passing clouds and 
showers favoring windward and mountain areas lasting into next 
weekend.

&&

.DISCUSSION...
Numerous unstable showers continue to develop in the coastal
waters this morning as shown on local radar imagery. An upper
level trough shown on satellite water vapor imagery near Kauai 
continues to sweep eastward through the region today. This trough 
will keep temperature inversion heights in the 7,000 to 10,000 
foot range allowing deeper cumulus cloud development and yet 
another day of afternoon to early evening mountain and island 
interior section sea breeze showers across the state. Slow moving
moderate to locally heavy showers may increase the potential for
water ponding on area roadways and higher stream levels in the 
afternoon to early evening hours. Overnight cloud and shower 
coverage will favor windward areas.

The ridge will slowly build north of the state on Monday and 
Tuesday as we transition back to more moderate trade winds. Sea 
breezes will become more localized and confined mainly to the 
terrain sheltered western slopes of each island. Clouds and 
showers will trend back to the more typical windward and mountain 
areas from Tuesday into next weekend, favoring overnight to early 
morning hours. A small increase in shower activity will favor 
windward sections of Maui and the Big Island from Monday night 
through Wednesday as a band of moisture drifts into these 
southeastern islands on the trade winds. Isolated thunderstorms
may form over the mountain slopes of the Big Island on Tuesday 
afternoon. Kauai may also see a slight boost to rainfall potential
as the upper low northwest of the state lingers closer to the 
Garden Isle. Elsewhere more typical trade wind weather will 
prevail into next weekend.

&&

.AVIATION...
Light trade winds along with an area of enhanced moisture and an 
upper trough in the area will support clouds and spotty showers 
over windward and mauka locations. Expect some showers to impact 
leeward and interior locations through the afternoon hours where 
sea breezes form today.

No AIRMETs are in effect at this time. 

&&

.MARINE...
With weak high pressure persisting far north of the islands, trade
winds will remain light to moderate through the weekend. Winds 
will strengthen modestly early in the new work week, becoming 
moderate to fresh.

The incoming south-southwest swell will increase surf along 
south-facing shores, peaking near the High Surf Advisory height 
of 10 feet by late today into Monday, then slowly fading through 
midweek. A medium-period southeast swell arriving Monday will be 
added to the mix and will hang on through Wednesday. Surf along 
east-facing shores will ease as trades back off, but may come up 
to some extent today if a medium-period easterly swell from 
former Hurricane Kay reaches our shores. Choppy wind waves along 
east shores will pick up in the new week in response to 
strengthening trades.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION...Bohlin
AVIATION...Gibbs
MARINE...Kinel