Severe Weather and Flooding Threats for the Central U.S.; Dangerous Heat in the Southern and Western U.S.

Severe weather and flooding threats will continue for portions of the central U.S. over the next couple of days, with multiple rounds of thunderstorms expected. Dangerous heat will persist across the southern and western U.S. through mid-week. Hot and dry conditions will fuel fire weather concerns for the Intermountain West, where dry thunderstorms may spark additional wildfires. Read More >

146
FXZS60 NSTU 240123
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
223 PM SST Tue Jun 23 2026

.Discussion...
Although limited showers were expected today, we have observed
more showers than forecast due to a moist boundary layer that
moved into the area. The high pressure system remains the
dominant weather feature; however, the moist boundary produced
scattered showers this morning. This moist layer is evident in
this afternoon`s upper air sounding, which shows moisture
extending from the surface to around 900 meters. Meanwhile, the
layers above appear to be very dry. Nonetheless, model guidance
indicates that limited showers will return tonight through
Thursday as this boundary continues moving westward.

Wind speeds are anticipated to remain from easterly at 10 to 15
mph through Wednesday. However, as the aforementioned high
pressure shifts farther east on Thursday, expect an uptick in
showers as a shearline moves through the area. By Friday, the
shearline will move southwest while a high pressure system near
New Zealand strengthens. This feature is forecast to return strong
southeasterly trade winds over the weekend.

&&
.Marine...
Latest wave heights observed at the PacIOOS buoys indicate that
seas have fallen below 8 feet, which is below advisory criteria.
Hence, the high surf and small craft advisories have been
cancelled.

Additionally, light winds are producing relatively smooth ocean
conditions, although this may be brief as easterly winds increase
to 10 to 15 knots tonight. While these winds are not particularly
strong, it is enough to create a somewhat rough ocean surface.
Expect these conditions to persist through Friday before stronger trade
winds return over the weekend.

.PPG WATCHES/WARNINGS/ADVISORIES...
None

&&

$$

TM