000
FZPN28 KNHC 180710
OFFPZ8

Offshore Waters Forecast
NWS National Hurricane Center Miami, FL
1210 AM PDT Tue Aug 18 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.

PMZ101-181915-
Synopsis for the E Pacific within 250 nm of Central America,
Colombia, and within 750 nm of Ecuador
1210 AM PDT Tue Aug 18 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 through Thu, with 
resultant rough seas, then moderate to fresh winds thereafter. 
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 south of the monsoon 
trough will diminish later this morning. Large southerly swell 
will impact waters mainly from Ecuador to the Galapagos Islands 
through Thu, largest expected through tonight. 

$$

PMZ111-181915-
Guatemala and El Salvador to 250 nm offshore-
1210 AM PDT Tue Aug 18 2026

.TODAY...E winds 10 kt. Seas 4 to 6 ft in SW swell. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.TONIGHT...NE to E 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. Period
14 seconds. Scattered showers and isolated tstms through the
night. 
.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 5 to 7 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
12 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 to 15 kt. Seas 4 to 6 ft. Period
13 seconds. 

$$

PMZ113-181915-
El Salvador to North Costa Rica including the Gulfs of Fonseca
and Papagayo-
1210 AM PDT Tue Aug 18 2026

.TODAY...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. 
.TONIGHT...NE to E winds 25 kt Offshore Gulf of Papagayo, and E
20 to 25 kt Elsewhere. Seas 6 to 9 ft. Period 15 seconds.
Scattered showers and isolated tstms through the night. 
.WED...NE to E winds 20 to 25 kt Offshore Gulf of Papagayo, and
E 15 to 20 kt Elsewhere. Seas 6 to 8 ft in SE swell. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.WED NIGHT...NE to E winds 20 to 25 kt Offshore Gulf of
Papagayo, and E 15 to 20 kt Elsewhere. Seas 5 to 7 ft. Period
14 seconds. Scattered showers and isolated tstms through the
night. 
.THU...E winds 15 to 25 kt. Seas 5 to 7 ft. Period 12 seconds. 
.THU NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft in S swell.
Period 11 seconds. 
.FRI...NE to E winds 20 kt Offshore Gulf of Papagayo, and NE to
E 10 to 15 kt Elsewhere. Seas 5 to 7 ft in S swell. Period
11 seconds. 
.FRI NIGHT...E to SE winds 10 to 15 kt. Seas 4 to 6 ft. Period
11 seconds. 
.SAT...NE to E winds 10 to 15 kt. Seas 5 to 7 ft in S swell.
Period 12 seconds. 
.SAT NIGHT...NE to E winds 20 kt Offshore Gulf of Papagayo, and
NE to E 10 to 15 kt Elsewhere. Seas 4 to 6 ft. Period
12 seconds. 

$$

PMZ115-181915-
North Costa Rica to West Panama to 250 nm offshore-
1210 AM PDT Tue Aug 18 2026

.TODAY...S winds 10 kt. Seas 4 to 6 ft in S to SW swell. Period
15 seconds. Scattered showers and isolated tstms through the
day. 
.TONIGHT...Near the Azuero Peninsula, variable winds less than
5 kt. Elsewhere, variable winds less than 5 kt, becoming S to SW
10 kt late. 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 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 day. 
.WED NIGHT...Variable winds less than 5 kt. Seas 4 to 6 ft in S
to SW swell. Period 14 seconds. Scattered showers and isolated
tstms through the night. 
.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 4 to 6 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. 

$$

PMZ117-181915-
East Panama and Colombia including the Gulf of Panama-
1210 AM PDT Tue Aug 18 2026

.TODAY...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 4 to 6 ft in SW
swell. Period 15 seconds. Scattered showers and isolated tstms
through the night. 
.TONIGHT...W to NW winds 10 kt. 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 14 seconds. Scattered showers and isolated tstms
through the night. 
.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 5 to 7 ft in S to SW swell.
Period 12 seconds. 
.FRI...W winds 10 kt. Seas 4 to 6 ft in S to SW swell. Period
11 seconds. 
.FRI NIGHT...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...W winds 10 kt. Seas 3 to 5 ft. Period 13 seconds. 

$$

PMZ119-181915-
Ecuador including the Gulf of Guayaquil to 250 nm offshore-
1210 AM PDT Tue Aug 18 2026

.TODAY...Gulf of Guayaquil, variable winds less than 5 kt,
becoming SW to W 10 kt in the afternoon. Elsewhere, S to SW
winds 10 to 15 kt. Seas 6 to 8 ft in SW swell. Period
15 seconds. 
.TONIGHT...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 9 ft in S to
SW swell. Period 13 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. 

$$

PMZ121-181915-
Ecuador between 250 and 500 nm offshore-
1210 AM PDT Tue Aug 18 2026

.TODAY...SE to S winds 10 to 15 kt. Seas 6 to 9 ft in S to SW
swell. Period 15 seconds. 
.TONIGHT...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...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S
swell. Period 12 seconds. 
.THU...SE to S winds 10 to 15 kt. Seas 6 to 8 ft in S swell.
Period 11 seconds. 
.THU NIGHT...SE to 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. 

$$

PMZ123-181915-
Offshore Galapagos Islands-
1210 AM PDT Tue Aug 18 2026

.TODAY...SE to S winds 15 to 20 kt. Seas 7 to 10 ft in S swell.
Period 14 seconds. 
.TONIGHT...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 11 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