Heat Wave and Severe Thunderstorms this Independence Day

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Midwest, and Mid-Atlantic. Numerous temperature records are expected. Clusters of severe thunderstorms will move across parts of the Allegheny Plateau into Mid Atlantic this Independence Day, with potential for widespread damaging winds. Additional severe thunderstorms in the Great Plains. Read More >

723
FXZS60 NSTU 040000
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
100 PM SST Fri Jul 3 2026

.Discussion...
A drier weather pattern is currently observed over the Tutuila as
the high pressure to the south continues to push the trough
northward (see previous forecast). Meanwhile, latest satellite
loops show convective clouds over Manu`a suggesting showers in
that area. Model guidance are consistent in pushing the trough
farther north, likely diminishing showers for Manu`a by tonight.
Scattered showers and south winds of 10 to 20 mph will persist
through Sunday.

As the high pressure system moves east, expect winds to shift
southeast Sunday night. Model data suggest winds will continue to
shift east following the movement of the high pressure through
midweek. East to southeast winds of 10 to 15 mph will remain for
this duration. However, a low pressure system to the south is
anticipated to draw a trough over the Islands by Thursday. Expect
an uptick in showers for the end of the forecast period.

&&
.Marine...
Latest wave heights observed at the PacIOOS buoys are around 8 to
10 feet, with peak periods up to 15 seconds. Wave heights remain
elevated, keeping the small craft advisory and high surf advisory
in effect. However, the high surf warning was downgraded to an
advisory this morning as wave heights are expected to continue to
diminish later today. In the meantime, surf will remain at the
higher end of the advisory (up to 14 feet) until at least
Saturday. Breezy winds and the south swell will keep choppy seas
and strong rip currents for the July 4th weekend.

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

&&

$$

TM