Areas of Severe Thunderstorms and Excessive Rainfall; Heat Wave Builds in the Intermountain West and Plains

A slow moving front will bring rounds of strong to severe thunderstorms and heavy rainfall to the central Plains eastward to the east-central U.S.. The first widespread significant heat wave of summer for the Intermountain West and Plains is expected to develop today and expand through next week. Dangerous heat will continue to impact portions of the Southwest and Southeast. Read More >

594
FXZS60 NSTU 100106
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
206 PM SST Thu Jul 9 2026

.Short term...
[TONIGHT THROUGH FRIDAY NIGHT]...Thunderstorm activity associated
with a trough to the northeast continues to move east as a high
pressure system builds near New Zealand. However, low cumulus
clouds are maintaining widespread showers across the territory as
moisture from the edge of the trough remains in the area. The
potential for flash flooding has diminished as the thunderstorms
have shifted further east, thus canceling the Flash Flood Watch
for American Samoa. Rainfall is expected to diminish tonight into
Friday morning. By Friday, expect scattered showers and southerly
winds of 10 to 15 mph due to the high pressure system. Cool and
stable weather is possible over the weekend as southerly winds
usher in cool air from the south.

.Long term...
[SATURDAY THROUGH THURSDAY]...As the trough continues to exit the
region, the aforementioned high pressure will dominate the weather
pattern through next week. South winds of 10 to 15 mph will
remain through Sunday, before shifting southeast as the high
pressure moves east. The building high pressure system will
strengthen winds from Monday through Thursday. Showers embedded
within the trade wind flow are possible for the long term
forecast.

&&
.Marine...
A High Surf Advisory and Small Craft Advisory remain in effect as
a south swell continues to move in the area. Expect elevated surf
and strong rip currents to persist through at least tonight. Seas
are forecast to fall below advisory thresholds by then. However,
south winds up to 15 knots my produce choppy seas through the
weekend. Although conditions will be better for mariners for this
timeframe, choppy seas may still be a nuisance for travel.

When trade winds return on Monday, a small craft advisory may
warrant as wind speeds up to 20 knots will meet the advisory
criteria. Rough ocean conditions will persist through the rest of
the forecast period.

.PPG WATCHES/WARNINGS/ADVISORIES...
High Surf Advisory
Small Craft Advisory

&&

$$

TM