FZPN28 KNHC 182239 OFFPZ8 Offshore Waters Forecast NWS National Hurricane Center Miami, FL 339 PM 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. PMZ101-191045- Synopsis for the E Pacific within 250 nm of Central America, Colombia, and within 750 nm of Ecuador 339 PM 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 through tonight. $$ PMZ111-191045- Guatemala and El Salvador to 250 nm offshore- 339 PM PDT Mon May 18 2026 .TONIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft in S to SW swell. Period 13 seconds. .TUE...E to SE winds 10 to 15 kt. Seas 4 to 6 ft. Period 15 seconds. .TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft in S to SW swell. Period 17 seconds. Scattered showers and isolated tstms through the night. .WED...E winds 10 to 15 kt. Seas 4 to 6 ft. Period 16 seconds. .WED NIGHT...E to SE winds 10 to 15 kt. Seas 4 to 6 ft. Period 15 seconds. .THU...NE winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .THU NIGHT...N winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .FRI...NE to E winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .FRI NIGHT...E winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .SAT...E winds 10 to 15 kt. Seas 3 to 5 ft. Period 14 seconds. .SAT NIGHT...E to SE winds 10 kt. Seas 3 to 5 ft. Period 15 seconds. $$ PMZ113-191045- El Salvador to North Costa Rica including the Gulfs of Fonseca and Papagayo- 339 PM PDT Mon May 18 2026 .TONIGHT...NE to 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 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 16 seconds. .WED NIGHT...E winds 20 to 25 kt Offshore Gulf of Papagayo, and E 10 to 15 kt Elsewhere. Seas 4 to 6 ft. Period 15 seconds. .THU...NE to E winds 15 to 20 kt. 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. .SAT...NE to E winds 15 to 20 kt Offshore Gulf of Papagayo, and E 10 kt Elsewhere. Seas 3 to 5 ft. Period 14 seconds. .SAT NIGHT...E winds 15 to 20 kt Offshore Gulf of Papagayo, and E to SE 10 kt Elsewhere. Seas 3 to 5 ft. Period 15 seconds. $$ PMZ115-191045- North Costa Rica to West Panama to 250 nm offshore- 339 PM PDT Mon May 18 2026 .TONIGHT...Variable winds less than 5 kt. Seas 2 to 4 ft. Period 17 seconds. .TUE...Variable winds less than 5 kt. Seas 2 to 4 ft. Period 17 seconds. .TUE NIGHT...Near the Azuero Peninsula, variable winds less than 5 kt, becoming NE 10 kt late. Elsewhere, variable winds less than 5 kt. Seas 2 to 4 ft. Period 17 seconds. Scattered showers and isolated tstms through the night. .WED...Variable winds less than 5 kt, becoming SW to W 10 kt in the afternoon. Seas 2 to 4 ft. Period 16 seconds. Scattered showers and isolated tstms through the day. .WED NIGHT...Variable winds less than 5 kt Near the Azuero Peninsula, and SW to W 10kt Elsewhere. Seas 2 to 4 ft. Period 15 seconds. .THU...Variable winds less than 5 kt Near the Azuero Peninsula, and S to SW 10 kt Elsewhere. Seas 2 to 4 ft. Period 14 seconds. .THU NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S to SW swell. Period 14 seconds. .FRI...Variable winds less than 5 kt. Seas 3 to 5 ft in S to SW swell. Period 14 seconds. .FRI NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S swell. Period 13 seconds. .SAT...Variable winds less than 5 kt. Seas 3 to 5 ft in S swell. Period 14 seconds. .SAT NIGHT...Variable winds less than 5 kt. Seas 3 to 5 ft in S to SW swell. Period 14 seconds. $$ PMZ117-191045- East Panama and Colombia including the Gulf of Panama- 339 PM PDT Mon May 18 2026 .TONIGHT...Gulf of Panama, E winds 10 kt, shifting to NW to N late. Elsewhere, variable winds less than 5 kt. Seas 2 to 4 ft. Period 17 seconds. Scattered showers and isolated tstms through the night. .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 to W 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 S to 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...W winds 10 kt. Seas 2 to 4 ft. Period 14 seconds. .SAT...SW to W winds 10 kt. Seas 2 to 4 ft. Period 13 seconds. .SAT NIGHT...SW winds 10 kt. Seas 2 to 4 ft. Period 15 seconds. $$ PMZ119-191045- Ecuador including the Gulf of Guayaquil to 250 nm offshore- 339 PM PDT Mon May 18 2026 .TONIGHT...S winds 10 kt. Seas 3 to 5 ft. Period 17 seconds. .TUE...Gulf of Guayaquil, variable winds less than 5 kt, becoming SW to W 10 kt in the afternoon. Elsewhere, S to SW winds 10 to 15 kt. Seas 4 to 6 ft. Period 17 seconds. .TUE NIGHT...S to SW winds 10 to 15 kt. Seas 4 to 6 ft in SW swell. Period 15 seconds. .WED...Gulf of Guayaquil, variable winds less than 5 kt, becoming SW to W 10 kt in the afternoon. Elsewhere, S to SW winds 10 kt. Seas 4 to 6 ft in SW swell. Period 15 seconds. .WED NIGHT...S to SW winds 10 to 15 kt. Seas 4 to 6 ft. Period 14 seconds. .THU...S to SW winds 10 to 15 kt. Seas 4 to 6 ft. Period 14 seconds. .THU NIGHT...S winds 10 kt. Seas 4 to 6 ft in S swell. Period 14 seconds. .FRI...S to SW winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .FRI NIGHT...S to SW winds 10 kt. Seas 3 to 5 ft. Period 13 seconds. .SAT...S winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .SAT NIGHT...S winds 10 kt. Seas 4 to 6 ft in SW swell. Period 16 seconds. $$ PMZ121-191045- Ecuador between 250 and 500 nm offshore- 339 PM PDT Mon May 18 2026 .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 kt. Seas 4 to 6 ft in S to SW swell. Period 15 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 4 to 6 ft in S swell. Period 14 seconds. .FRI NIGHT...SE to S winds 10 kt. Seas 3 to 5 ft. Period 14 seconds. .SAT...SE to S winds 10 to 15 kt. Seas 4 to 6 ft. Period 15 seconds. .SAT NIGHT...SE to S winds 10 kt. Seas 4 to 6 ft in SW swell. Period 16 seconds. $$ PMZ123-191045- Offshore Galapagos Islands- 339 PM PDT Mon May 18 2026 .TONIGHT...SE winds 10 to 15 kt. Seas 4 to 6 ft. Period 17 seconds. .TUE...SE winds 10 to 15 kt. Seas 5 to 7 ft in SW to W swell. Period 16 seconds. .TUE NIGHT...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SW to W swell. Period 15 seconds. .WED...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SW to W swell. Period 15 seconds. .WED NIGHT...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in S to SW swell. Period 13 seconds. .THU...SE to S winds 10 to 15 kt. Seas 5 to 7 ft in SE to S swell. Period 13 seconds. .THU NIGHT...SE to S winds 10 kt. Seas 5 to 7 ft in SE to S swell. Period 14 seconds. .FRI...SE to S winds 10 kt. Seas 4 to 6 ft in S to SW swell. Period 13 seconds. .FRI NIGHT...SE winds 10 to 15 kt. Seas 4 to 6 ft. Period 14 seconds. .SAT...SE winds 10 to 15 kt. Seas 5 to 7 ft in W to NW swell. Period 15 seconds. .SAT NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft in SW to W swell. Period 14 seconds. $$ Forecaster Chan