Coastal and Marine Impacts from Imelda and Humberto as Both Track Away from the Southeast U.S.

Swells and high surf from both Imelda and Humberto are expected to bring dangerous marine and rip current conditions to the east coast of Florida and Georgia today, spreading north along much of the east coast of the U.S. this week. Heavy rainfall north and west of Imelda falling across coastal Florida and Georgia into the Carolinas could cause isolated flash and urban flooding through Tuesday. Read More >

105
FXZS60 NSTU 290051
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
151 PM SST Sun Sep 28 2025

.Short term [tonight through Tuesday Night]...
A high pressure system to the southwest will drive the weather
conditions across the territory throughout the upcoming week.
Abundant sunshine and stable weather has been observed across the
territory today. However, a trough to the north and a weak area
of convergence to the south will lead to multiple changes in
weather pattern. The convergence to the south is where stronger
winds associated with the high pressure system are converging
with the weaker ~10 MPH winds that have been experienced across
the territory today. The high pressure system will expand closer
to the territory, bringing this weak convergence over the
territory tomorrow through tomorrow night. An increase in passing
showers is expected from this convergence, but rainfall should
mostly be light and is not expected to cause flooding. By
Tuesday, the convergence is expected to move to the north of the
territory and merge with the trough, bringing a brief break in
showers as winds begin to increase in strength.

.Long term [Wednesday through Sunday]...
The high pressure system will maximize in intensity early
Wednesday, leading to winds out of the southeast reaching high as
25 MPH Wednesday and Thursday. As the high pressure slowly
weakens and moves away to the east late Wednesday through the
remainder of the week, the trough to the north will move closer
to the territory, bringing numerous showers by mid to late week,
with a higher potential for heavy rainfall compared to the weak
convergence earlier in the week. The trough is forecast to linger
in the area through the weekend, continuing the potential for
numerous showers. Winds will turn out of the east and slightly
decrease by the weekend as the high pressure moves away.

&&

.Marine...
Combined wave heights remain ideal for marine activities, at only
4 to 6 feet. Breaking waves were reported by an NWS employee
along south facing shorelines, these are the result of a very
long period south swell, with period times at the King Poloa buoy
reaching 20 seconds in length. Due to the very low combined wave
heights, this still remains well below High Surf Advisory
threshold , but could slightly increase the risk for rip
currents. The fresh breeze on Wednesday and Thursday should
increase seas back to Small Craft Advisory levels mid through
late week.

&&

.PPG WATCHES/WARNINGS/ADVISORIES...
None

&&

$$

Barton