Lala Impacting Hawaii; Severe Thunderstorm and Flash Flooding Risks; Excessive Heat

Areas of gusty winds, heavy rain leading to flash flooding, and high surf continue across portions of Hawaii as Tropical Storm Lala continues to move away from the islands. Severe thunderstorm, heavy rainfall, and flash flooding threats continue from the Midwest to the Mid-Atlantic and across the central High Plains. Record heat continues for areas of the central/southern Plain into the Southeast Read More >

279
FXZS60 NSTU 170048
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
148 PM SST Sun Aug 16 2026

.Short term...

A ridge of high pressure remains over the American Samoa islands,
which continues to provide below average rainfall for the
territory. Satellite imagery shows a few low level clouds and
cirrus clouds (thin and wispy), but no rainfall in the region.
These conditions are expected to continue through Tuesday.
Scattered showers (30% chance) remains in the forecast tonight,
while isolated showers (20% chance) for Monday. Winds also become
light and variable on Monday as the ridge weakens before becoming
a light easterly trade wind breeze on Tuesday. More sun than
clouds are anticipated with temperature back to around average.

.Long term...

Another ridge moves over the territory by Wednesday, but is
anticipated to be stronger than the aforementioned ridge. This
will likely increase southeasterly trades up to around 20 to 25
mph by late in the week. As the winds increase on Tuesday night
and Wednesday, this will increase the risk of rain. If any showers
occur, however, flash flooding is not likely. The trade wind
pattern will likely stay for the rest of the week and weekend. If
any rainfall occurs, it would be in the passing form with
temperatures falling back to below average as cooler air from the
south advects into the region.

&&

.Marine...

As winds continue to decrease with no significant swell moving
through the American Samoa coastal waters, seas continue to ease.
As of midday, the PacIOOS buoy to the east of Aunu`u shows seas
around 6 feet and to the west of Tutuila around 4.5 feet. Seas are
forecast continue easing through tomorrow as light and variable
winds are forecast. Seas will be generally smoother than normal
through early Tuesday. By later Tuesday, winds slowly begin to
increase but may sharply increase to a southeasterly fresh to
strong breeze by Wednesday and remain through the rest of the
week. This will cause seas to build and may reach up to 12 feet by
Wednesday night through the rest of the week. Therefore, expect
Small Craft Advisory conditions beginning Wednesday.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...

NONE

&&

$$

LaPlante