FXZS60 NSTU 210103

AFDPPG



Area Forecast Discussion

National Weather Service Pago Pago  AS

203 PM SST Fri Mar 20 2026



.DISCUSSION...

A ridge of high pressure lingering over the area kept partly 

cloudy skies with passing showers from time to time throughout 

the day. The atmospheric profile shown on this afternoon's

(21/00Z) radiosonde observations (RAOB) support these conditions- 

moderate easterlies throughout the atmosphere with a 

conditionally unstable profile. Model data show these features 

remaining over the islands tonight through at least late Tuesday.

By midweek and the rest of the forecast period, model shows a

trough to the south moving over the area as it increases the

potential for showers and thunderstorms. This may enhance the

possibility of minor to moderate flooding on the roadways and

vulnerable areas.



Thus, expect isolated to scattered showers with gentle to 

moderate easterlies for tonight through at least Monday night.

Expect a higher chance of showers with possible thunderstorms, 

and light and variable winds for the rest of the forecast period.



&&



.Marine...

As gentle to moderate easterlies prevail throughout the day,

a moderately choppy and elevated seas was also observed over the

waters. These observations are supported by data from the PacIOOS

buoys. Seas of 5 to 7 feet with peak periods more than 13 seconds

long will likely remain over the area tonight through at least

Sunday night. By Monday, model data shows a large south swell

moving into the area, elevating seas to near or over advisory 

thresholds (8 feet). Thunderstorms that are also embedded within

the aforementioned trough will increase gusty winds and elevate

seas. The gentle easterlies will become light and variable by 

this time frame. No other significant threat is expected for this

forecast period.



&&



.PPG WATCHES/WARNINGS/ADVISORIES...

NONE



&&



$$



JTAllen