Severe Weather Possible from the Central Plains to the Northeast; Building Heat in the West; Fire Weather Concerns for the Southwest

Severe thunderstorms are possible from the Ohio Valley to the central Plains this evening, and the threat will expand into the Mid-Atlantic and Northeast on Monday. Hazardous heat will linger across the southern U.S. and build across the West through mid-week. Hot and dry conditions will fuel fire weather concerns for Alaska through this evening and for the Four Corners region through Monday. Read More >

187
FXZS60 NSTU 210057
AFDPPG

Area Forecast Discussion
National Weather Service Pago Pago AS
157 PM SST Sat Jun 20 2026

.DISCUSSION...
The latest satellite imageries continue to show a convergence zone
just to the north of the area, held by strong winds from the high
pressure system to the southwest-south (anchored over the New
Zealand area). Model data shows the embedded clouds within the
strong south winds together with the trough line/convergence area
are continuing to hold overcast skies and the likelihood of flash
flooding conditions over the islands. However, with overcast
skies observed throughout the day, no flash flooding conditions
are expected. Showers will likely be in widely scattered form with
brief heavy showers from time to time. These conditions are
expected to remain across the islands through at least Sunday.
Moderate to fresh south winds with embedded scattered to numerous
showers is expected to remain for tonight through Sunday.

By Sunday night, the aforementioned high pressure system will
continue to hold moderate south winds with fair weather conditions
through at least Monday. Winds will turn southeast at a gentle
breeze on Monday night and Tuesday, turning east on Tuesday night
as the high pressure system migrates further east. These gentle
east winds will remain for the rest of the week as embedded
showers within the wind flow moves across the territory,
increasing the potential for showers for the second half of the
week.

&&

.Marine...
Gusty south winds remain across the coastal waters, generating
rough and hazardous seas for mariners and swimmers alike. These
winds are shown to create choppy seas, which are also supported
by the latest data from the PacIOOS buoys. Peak periods are less
than 10 seconds long. Model data show these conditions remaining
through at least Monday night and easing to favorable heights on
Tuesday and Tuesday night. By the end of the forecast period, seas
will slightly elevate again. However, not to advisory thresholds.
Therefore, the advisories for high surfs and small crafts remains
in effect through at least Monday night.

&&

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

&&

$$

JTAllen