Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

717
FXZS60 NSTU 190122
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
222 PM SST Tue Aug 18 2026

.Short term...

More sun than clouds were observed over American Samoa with no
rainfall recorded throughout the territory. A ridge from the
southwest begins to build into the region, however, and
southeasterly winds are forecast to increase beginning in the
overnight hours through the end of the week. Southeasterly trades
may reach up to 25 mph at times from Wednesday night through the
weekend. As winds increase, the risk of trade wind showers
increase. If showers occur, it would be in the passing form and
heavy rain is not expected. Therefore, total rainfall amounts are
still expected to be below normal and more clouds than sun are
anticpated throughout this time period. Temperatures are to be at
or slightly below normal.

.Long term...

For early next week, the aforementioned ridge is forecast to
remain in the region to continue providing elevated tradewinds
over the region. We will monitor the possibility of a trough to be
pushed southward to approach the American Samoa islands, which
would increase the risk of showers. Even if the trough moves over
the area, flash flooding is not expected but it may increase rain
back to normal for this time of the year.

&&

.Marine...

Ideal conditions remained over the American Samoa coastal waters
today as winds remained gentle. Winds are to strengthen overnight
tonight and eventually reaching a fresh to strong southeasterly
breeze on Wednesday night through the rest of the week. This will
elevate seas to advisory levels as waves are forecast to reach up
to 12 feet by Wednesday night through at least Saturday.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...

NONE

&&

$$

LaPlante