000
FZPN28 KNHC 180128
OFFPZ8

Offshore Waters Forecast
NWS National Hurricane Center Miami, FL
628 PM PDT Mon Aug 17 2026

Offshore Waters Forecast for the E Pacific within 250 nm of
Central America, Colombia, and within 750 nm of Ecuador

Seas given as significant wave height, which is the average
height of the highest 1/3 of the waves. Individual waves may be
more than twice the significant wave height.

PMZ101-181330-
Synopsis for the E Pacific within 250 nm of Central America,
Colombia, and within 750 nm of Ecuador
628 PM PDT Mon Aug 17 2026

.SYNOPSIS...The pressure gradient between high pressure over the
western Caribbean and relatively lower pressure over Central 
America will lead to pulsing strong to near gale-froce northeast 
to east gap winds over the Papagayo region, with resultant rough 
seas. Moderate to fresh associated winds will extend well 
downwind across the outer offshore waters of El Salvador and 
Guatemala at times. Moderate to fresh southerly winds will pulse 
south of the monsoon trough through tonight. Large southerly 
swell will impact waters mainly from Ecuador to the Galapagos 
Islands through Wed night, largest expected through Tue night.

$$

PMZ111-181330-
Guatemala and El Salvador to 250 nm offshore-
628 PM PDT Mon Aug 17 2026

.TONIGHT...E winds 10 kt, becoming variable winds less than
5 kt. Seas 5 to 7 ft in SW swell. Period 14 seconds.
.TUE...NE to E winds 10 kt. Seas 4 to 6 ft in SW swell. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.TUE NIGHT...NE winds 10 to 15 kt. Seas 5 to 7 ft in SW swell.
Period 15 seconds. Scattered showers and isolated tstms through
the night. 
.WED...E winds 15 to 20 kt. Seas 6 to 8 ft in S swell. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.WED NIGHT...E winds 15 to 20 kt. Seas 6 to 8 ft in SE swell.
Period 12 seconds. 
.THU...E to SE winds 15 to 20 kt. Seas 5 to 7 ft. Period
12 seconds. 
.THU NIGHT...E to SE winds 10 to 15 kt. Seas 6 to 8 ft in SE to
S swell. Period 11 seconds. 
.FRI...E to SE winds 10 to 15 kt. Seas 5 to 7 ft in S swell.
Period 11 seconds. 
.FRI NIGHT...E winds 10 kt. Seas 5 to 7 ft in S swell. Period
11 seconds. 
.SAT...E winds 10 to 15 kt. Seas 5 to 7 ft in S swell. Period
12 seconds. 
.SAT NIGHT...NE to E winds 10 kt. Seas 4 to 6 ft in S swell.
Period 13 seconds. 

$$

PMZ113-181330-
El Salvador to North Costa Rica including the Gulfs of Fonseca
and Papagayo-
628 PM PDT Mon Aug 17 2026

.TONIGHT...Offshore Gulf of Papagayo, NE to E winds 20 to 30 kt.
Elsewhere, NE to E winds 10 to 15 kt. Seas 5 to 8 ft in mixed NE
to E wind waves and S to SW swell. Period 14 seconds. Scattered 
showers and isolated tstms through the night. 
.TUE...NE to E winds 20 to 25 kt Offshore Gulf of Papagayo, and
NE to E 15 to 20 kt Elsewhere. Seas 5 to 7 ft. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.TUE NIGHT...E winds 20 to 25 kt. Seas 6 to 8 ft. Period
15 seconds. Scattered showers and isolated tstms through the
night. 
.WED...E winds 15 to 20 kt. Seas 6 to 8 ft in E to SE swell.
Period 15 seconds. Scattered showers and isolated tstms through
the day. 
.WED NIGHT...E winds 20 to 25 kt. Seas 5 to 7 ft. Period
12 seconds. 
.THU...E winds 15 to 20 kt. Seas 5 to 7 ft. Period 11 seconds. 
.THU NIGHT...E to SE winds 15 to 20 kt. Seas 4 to 6 ft. Period 
11 seconds. 
.FRI...NE to E winds 10 to 15 kt. Seas 5 to 7 ft in S swell.
Period 11 seconds. 
.FRI NIGHT...E to SE winds 10 to 15 kt, except NE to E 15 to 20
kt Offshore Gulf of Papagayo. Seas 4 to 6 ft. Period 11 seconds.
.SAT...NE winds 10 to 15 kt. Seas 5 to 7 ft in S swell. Period
12 seconds. 
.SAT NIGHT...NE to E winds 20 to 25 kt Offshore Gulf of
Papagayo, and NE to E 10 to 15 kt Elsewhere. Seas 4 to 7 ft.
Period 12 seconds. 

$$

PMZ115-181330-
North Costa Rica to West Panama to 250 nm offshore-
628 PM PDT Mon Aug 17 2026

.TONIGHT...SW to W winds 10 kt. Seas 4 to 6 ft in S to SW swell.
Period 14 seconds. Numerous showers and tstms through the night.
.TUE...Near the Azuero Peninsula, E winds 10 kt in the morning,
becoming variable winds less than 5 kt. Elsewhere, S to SW winds
10 kt. Seas 4 to 6 ft in S to SW swell. Period 15 seconds.
Scattered showers and isolated tstms through the day. 
.TUE NIGHT...Variable winds less than 5 kt Near the Azuero
Peninsula, and S to SW 10 kt Elsewhere. Seas 4 to 6 ft in S to
SW swell. Period 15 seconds. Scattered showers and isolated
tstms through the night. 
.WED...Variable winds less than 5 kt Near the Azuero Peninsula,
and S 10 kt Elsewhere. Seas 4 to 6 ft in S to SW swell. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.WED NIGHT...Variable winds less than 5 kt Near the Azuero
Peninsula, and SW to W 10 kt Elsewhere. Seas 4 to 6 ft in S to
SW swell. Period 12 seconds. 
.THU...Variable winds less than 5 kt. Seas 4 to 6 ft in S to SW
swell. Period 12 seconds. 
.THU NIGHT...Variable winds less than 5 kt. Seas 4 to 6 ft in S
to SW swell. Period 11 seconds. 
.FRI...Variable winds less than 5 kt. Seas 4 to 6 ft in S swell.
Period 11 seconds. 
.FRI NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S
swell. Period 10 seconds. 
.SAT...Variable winds less than 5 kt. Seas 3 to 5 ft in S swell.
Period 10 seconds. 
.SAT NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S
swell. Period 11 seconds. 

$$

PMZ117-181330-
East Panama and Colombia including the Gulf of Panama-
628 PM PDT Mon Aug 17 2026

.TONIGHT...Gulf of Panama, W winds 10 kt, becoming variable
winds less than 5 kt. Elsewhere, SW winds 10 kt. Seas 4 to 6 ft
in SW swell. Period 14 seconds. Numerous showers and tstms 
through the night. 
.TUE...Gulf of Panama, E to SE winds 10 kt in the morning,
becoming variable winds less than 5 kt. Elsewhere, SE winds
10 kt, shifting to W in the afternoon. Seas 3 to 5 ft. Period
15 seconds. 
.TUE NIGHT...Variable winds less than 5 kt Gulf of Panama, and W
10 kt Elsewhere. Seas 3 to 5 ft. Period 15 seconds. Scattered
showers and isolated tstms through the night. 
.WED...SW to W winds 10 kt. Seas 4 to 6 ft in SW swell. Period
15 seconds. 
.WED NIGHT...SW to W winds 10 kt. Seas 5 to 7 ft in S to SW
swell. Period 13 seconds. 
.THU...SW to W winds 10 kt. Seas 5 to 7 ft in S to SW swell.
Period 13 seconds. 
.THU NIGHT...W winds 10 kt. Seas 4 to 6 ft in S to SW swell.
Period 12 seconds. 
.FRI...Variable winds less than 5 kt Gulf of Panama, and SW to W
10 kt Elsewhere. Seas 4 to 6 ft in S to SW swell. Period
11 seconds. 
.FRI NIGHT...SW to W winds 10 kt. Seas 4 to 6 ft in S to SW
swell. Period 12 seconds. 
.SAT...Variable winds less than 5 kt Gulf of Panama, and SW
10 kt Elsewhere. Seas 3 to 5 ft. Period 12 seconds.
.SAT NIGHT...Variable winds less than 5 kt Gulf of Panama, and
SW to W 10 kt Elsewhere. Seas 3 to 5 ft. Period 13 seconds. 

$$

PMZ119-181330-
Ecuador including the Gulf of Guayaquil to 250 nm offshore-
628 PM PDT Mon Aug 17 2026

.TONIGHT...S winds 10 to 15 kt. Seas 5 to 7 ft in SW swell.
Period 14 seconds. 
.TUE...S to SW winds 10 to 15 kt. Seas 6 to 8 ft in SW swell.
Period 15 seconds. 
.TUE NIGHT...S to SW winds 10 to 15 kt. Seas 6 to 9 ft in S to
SW swell. Period 15 seconds. 
.WED...S to SW winds 10 to 15 kt. Seas 6 to 9 ft in S to SW
swell. Period 14 seconds. 
.WED NIGHT...S to SW winds 10 to 15 kt. Seas 6 to 8 ft in S to
SW swell. Period 12 seconds. 
.THU...S to SW winds 10 to 15 kt. Seas 6 to 8 ft in S to SW
swell. Period 11 seconds. 
.THU NIGHT...S to SW winds 10 kt. Seas 5 to 7 ft in S to SW
swell. Period 10 seconds. 
.FRI...S to SW winds 10 kt. Seas 4 to 6 ft in S swell. Period
11 seconds. 
.FRI NIGHT...S to SW winds 10 kt. Seas 4 to 6 ft in S swell.
Period 12 seconds. 
.SAT...S to SW winds 10 kt. Seas 4 to 6 ft in S swell. Period
12 seconds. 
.SAT NIGHT...S to SW winds 10 kt. Seas 3 to 5 ft. Period
11 seconds. 

$$

PMZ121-181330-
Ecuador between 250 and 500 nm offshore-
628 PM PDT Mon Aug 17 2026

.TONIGHT...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S to SW
swell. Period 14 seconds. 
.TUE...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S to SW
swell. Period 15 seconds. 
.TUE NIGHT...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S to
SW swell. Period 14 seconds. 
.WED...S winds 10 to 15 kt. Seas 6 to 8 ft in S to SW swell.
Period 13 seconds. 
.WED NIGHT...S winds 10 to 15 kt. Seas 6 to 8 ft in S swell.
Period 11 seconds. 
.THU...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in S swell.
Period 10 seconds. 
.THU NIGHT...S winds 10 kt. Seas 5 to 7 ft in S swell. Period
10 seconds. 
.FRI...SE to S winds 10 kt. Seas 5 to 7 ft in S swell. Period
10 seconds. 
.FRI NIGHT...S winds 10 kt. Seas 4 to 6 ft in S swell. Period
10 seconds. 
.SAT...S winds 10 kt. Seas 4 to 6 ft in SE to S swell. Period
10 seconds. 
.SAT NIGHT...S winds 10 kt. Seas 4 to 6 ft in SE to S swell.
Period 10 seconds. 

$$

PMZ123-181330-
Offshore Galapagos Islands-
628 PM PDT Mon Aug 17 2026

.TONIGHT...SE winds 15 to 20 kt. Seas 6 to 9 ft in S swell.
Period 15 seconds. 
.TUE...SE to S winds 10 to 15 kt. Seas 6 to 9 ft in S swell.
Period 14 seconds. 
.TUE NIGHT...SE to S winds 10 to 15 kt. Seas 6 to 9 ft in S
swell. Period 12 seconds. 
.WED...SE to S winds 10 to 15 kt. Seas 6 to 9 ft in S swell.
Period 11 seconds. 
.WED NIGHT...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S
swell. Period 10 seconds. 
.THU...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S swell.
Period 10 seconds. 
.THU NIGHT...SE to S winds 10 kt. Seas 6 to 8 ft in S swell.
Period 10 seconds. 
.FRI...SE to S winds 10 kt. Seas 5 to 7 ft in SE to S swell.
Period 10 seconds. 
.FRI NIGHT...SE to S winds 10 kt. Seas 5 to 7 ft in SE to S
swell. Period 11 seconds. 
.SAT...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SE to S
swell. Period 11 seconds. 
.SAT NIGHT...SE to S winds 10 kt. Seas 4 to 6 ft in SE to S
swell. Period 12 seconds. 

$$

Forecaster Lewitsky