403 
FZPN28 KNHC 181559
OFFPZ8

Offshore Waters Forecast
NWS National Hurricane Center Miami, FL
859 AM PDT Mon May 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.

PMZ101-190400-
Synopsis for the E Pacific within 250 nm of Central America,
Colombia, and within 750 nm of Ecuador
859 AM PDT Mon May 18 2026

.SYNOPSIS...Fresh easterly gap winds in the Papagayo region will
pulse to strong during the night-time hours through Wed night. 
Elsewhere, gentle to moderate winds along with moderate seas in 
southerly swell are expected through most of this week. Scattered
heavy showers and isolated thunderstorms will linger in the
offshore waters of Costa Rica, Panama and Colombia today.

$$

PMZ111-190400-
Guatemala and El Salvador to 250 nm offshore-
859 AM PDT Mon May 18 2026

.TODAY...E winds 15 to 20 kt. Seas 4 to 6 ft. Period 13 seconds.
.TONIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft in S to SW swell.
Period 13 seconds. 
.TUE...E to SE winds 10 to 15 kt. Seas 4 to 6 ft. Period
15 seconds. 
.TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft in S to SW
swell. Period 17 seconds. Scattered showers and isolated tstms
through the night. 
.WED...NE to E winds 10 to 15 kt. Seas 4 to 6 ft. Period
15 seconds. 
.WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. Period
15 seconds. 
.THU...NE winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. 
.THU NIGHT...NE to E winds 10 kt. Seas 3 to 5 ft. Period
14 seconds. 
.FRI...NE winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. 
.FRI NIGHT...E winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. 

$$

PMZ113-190400-
El Salvador to North Costa Rica including the Gulfs of Fonseca
and Papagayo-
859 AM PDT Mon May 18 2026

.TODAY...E winds 15 to 20 kt. Seas 5 to 7 ft in S to SW swell.
Period 13 seconds. 
.TONIGHT...E winds 20 to 25 kt Offshore Gulf of Papagayo, and E
to SE 15 to 20 kt Elsewhere. Seas 5 to 7 ft. Period 13 seconds. 
.TUE...E winds 15 to 20 kt. Seas 6 to 8 ft in S swell. Period
17 seconds. 
.TUE NIGHT...NE to E winds 20 to 25 kt Offshore Gulf of Papagayo,
and SE to S 15 to 20 kt Elsewhere. Seas 6 to 8 ft. Period 17 
seconds. 
.WED...NE winds 15 to 20 kt. Seas 6 to 8 ft in S swell. Period
13 seconds. 
.WED NIGHT...NE to E winds 20 to 25 kt Offshore Gulf of Papagayo,
and E to SE winds 10 to 15 kt elsewhere. Seas 4 to 6 ft. Period 
15 seconds. 
.THU...NE to E winds 20 to 25 kt Offshore Gulf of Papagayo, and
NE to E 10 to 15 kt Elsewhere. Seas 5 to 7 ft. Period
14 seconds. 
.THU NIGHT...E to SE winds 10 kt. Seas 4 to 6 ft in S to SW
swell. Period 14 seconds. 
.FRI...E to SE winds 10 to 15 kt. Seas 3 to 5 ft. Period
14 seconds. 
.FRI NIGHT...SE to S winds 10 kt. Seas 3 to 5 ft. Period
14 seconds. 

$$

PMZ115-190400-
North Costa Rica to West Panama to 250 nm offshore-
859 AM PDT Mon May 18 2026

.TODAY...Variable winds less than 5 kt. Seas 2 to 4 ft. Period
13 seconds. Scattered heavy showers and isolated tstms through
the day.
.TONIGHT...Variable winds less than 5 kt. Seas 2 to 4 ft. Period
17 seconds. 
.TUE...Variable winds less than 5 kt. Seas 2 to 4 ft. Period
17 seconds. 
.TUE NIGHT...Variable winds less than 5 kt. Seas 2 to 4 ft.
Period 17 seconds. Scattered showers and isolated tstms through
the night. 
.WED...Variable winds less than 5 kt. Seas 2 to 4 ft. Period
15 seconds. 
.WED NIGHT...Variable winds less than 5 kt. Seas 2 to 4 ft.
Period 15 seconds. 
.THU...Variable winds less than 5 kt Near the Azuero Peninsula,
and S to SW 10 kt Elsewhere. Seas 2 to 4 ft. Period 14 seconds. 
.THU NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S
to SW swell. Period 14 seconds. 
.FRI...Variable winds less than 5 kt. Seas 3 to 5 ft in S to SW
swell. Period 14 seconds. 
.FRI NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S
swell. Period 13 seconds. 

$$

PMZ117-190400-
East Panama and Colombia including the Gulf of Panama-
859 AM PDT Mon May 18 2026

.TODAY...Gulf of Panama, NW to N winds 10 kt in the morning.
Variable winds less than 5 kt in the afternoon. Elsewhere,
variable winds less than 5 kt in the morning. Seas 2 to 4 ft.
Period 14 seconds. Scattered heavy showers and isolated tstms
through the day.
.TONIGHT...NE to E winds 10 kt Gulf of Panama, and variable less
than 5 kt Elsewhere. Seas 2 to 4 ft. Period 17 seconds. 
.TUE...S winds 10 kt, shifting to W in the afternoon. Seas 2 to
4 ft. Period 17 seconds. 
.TUE NIGHT...SW winds 10 kt. Seas 2 to 4 ft. Period 17 seconds.
Scattered showers and isolated tstms through the night. 
.WED...SW to W winds 10 kt. Seas 3 to 5 ft. Period 15 seconds. 
.WED NIGHT...SW winds 10 kt. Seas 3 to 5 ft. Period 15 seconds. 
.THU...SW winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. 
.THU NIGHT...Variable winds less than 5 kt Gulf of Panama, and
SW 10 kt Elsewhere. Seas 3 to 5 ft. Period 14 seconds. 
.FRI...Variable winds less than 5 kt Gulf of Panama, and SW
10 kt Elsewhere. Seas 2 to 4 ft. Period 14 seconds.
.FRI NIGHT...Variable winds less than 5 kt. Seas 2 to 4 ft.
Period 14 seconds. 

$$

PMZ119-190400-
Ecuador including the Gulf of Guayaquil to 250 nm offshore-
859 AM PDT Mon May 18 2026

.TODAY...Gulf of Guayaquil, variable winds less than 5 kt,
becoming SW to W 10 kt in the afternoon. Elsewhere, S winds
10 kt. Seas 3 to 5 ft. Period 17 seconds. 
.TONIGHT...S winds 10 kt. Seas 3 to 5 ft. Period 17 seconds. 
.TUE...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 4 to 6 ft. Period 17 seconds. 
.TUE NIGHT...S to SW winds 10 to 15 kt. Seas 4 to 6 ft in SW
swell. Period 15 seconds. 
.WED...S to SW winds 10 kt. Seas 4 to 6 ft in SW swell. Period
14 seconds. 
.WED NIGHT...S to SW winds 10 to 15 kt. Seas 4 to 6 ft. Period
14 seconds. 
.THU...S to SW winds 10 kt. Seas 4 to 6 ft in S to SW swell.
Period 14 seconds. 
.THU NIGHT...S winds 10 kt. Seas 4 to 6 ft in S swell. Period
14 seconds. 
.FRI...S to SW winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. 
.FRI NIGHT...S to SW winds 10 kt. Seas 3 to 5 ft. Period
13 seconds. 

$$

PMZ121-190400-
Ecuador between 250 and 500 nm offshore-
859 AM PDT Mon May 18 2026

.TODAY...SE to S winds 10 kt. Seas 3 to 5 ft. Period 17 seconds.
.TONIGHT...SE to S winds 10 to 15 kt. Seas 3 to 5 ft. Period
17 seconds. 
.TUE...SE to S winds 10 to 15 kt. Seas 4 to 6 ft. Period
16 seconds. 
.TUE NIGHT...SE to S winds 10 to 15 kt. Seas 4 to 6 ft. Period
16 seconds. 
.WED...SE to S winds 10 to 15 kt. Seas 4 to 6 ft. Period
14 seconds. 
.WED NIGHT...S winds 10 to 15 kt. Seas 4 to 6 ft. Period
14 seconds. 
.THU...SE to S winds 10 to 15 kt. Seas 4 to 6 ft. Period
14 seconds. 
.THU NIGHT...SE to S winds 10 kt. Seas 4 to 6 ft in SE to S
swell. Period 14 seconds. 
.FRI...SE to S winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. 
.FRI NIGHT...SE to S winds 10 kt. Seas 3 to 5 ft. Period
14 seconds. 

$$

PMZ123-190400-
Offshore Galapagos Islands-
859 AM PDT Mon May 18 2026

.TODAY...SE winds 10 to 15 kt. Seas 4 to 6 ft. Period
17 seconds. 
.TONIGHT...SE winds 10 to 15 kt. Seas 4 to 6 ft. Period
17 seconds. 
.TUE...SE winds 10 to 15 kt. Seas 5 to 7 ft. Period 16 seconds. 
.TUE NIGHT...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SW to
W swell. Period 15 seconds. 
.WED...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SW to W
swell. Period 13 seconds. 
.WED NIGHT...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in S to
SW swell. Period 13 seconds. 
.THU...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SE to S
swell. Period 13 seconds. 
.THU NIGHT...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SE to
S swell. Period 14 seconds. 
.FRI...SE to S winds 10 kt. Seas 4 to 6 ft in S to SW swell.
Period 13 seconds. 
.FRI NIGHT...SE to S winds 10 to 15 kt. Seas 4 to 6 ft. Period
14 seconds. 

$$

Forecaster Chan