000 FZNT32 KNHC 182020 OFFN21 MARINE WEATHER HF VOICE BROADCAST NWS NATIONAL HURRICANE CENTER MIAMI FL 420 PM EDT TUE AUG 18 2015 MARINE WEATHER HF VOICE BROADCAST FOR THE GULF OF MEXICO 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. SYNOPSIS FOR THE GULF OF MEXICO .SYNOPSIS...AN E TO W RIDGE WILL EXTEND ACROSS THE NORTHERN WATERS THROUGH FRI. A THERMAL TROUGH WILL DEVELOP EACH EVENING OVER THE YUCATAN PENINSULA...THEN MOVE W INTO THE SW GULF EACH NIGHT INTO EARLY MORNING THEN DISSIPATE BY EARLY AFTERNOON OVER THE SW GULF. GULF OF MEXICO N OF 26N W OF 87W .TONIGHT...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .WED...S WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .WED NIGHT...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .THU...S WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .THU NIGHT...SE WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .FRI...S WINDS 10 TO 15 KT. SEAS 3 TO 4 FT. .FRI NIGHT...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .SAT...SE WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .SAT NIGHT...SE WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .SUN...NE WINDS 10 KT. SEAS 3 FT. .SUN NIGHT...E WINDS 10 KT. SEAS 2 FT OR LESS. GULF OF MEXICO FROM 22N TO 26N W OF 87W .TONIGHT...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .WED...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .WED NIGHT...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .THU...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .THU NIGHT...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .FRI...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .FRI NIGHT...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .SAT...SE WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. .SAT NIGHT...E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .SUN...E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .SUN NIGHT...E WINDS 10 TO 15 KT. SEAS 3 TO 4 FT. SW GULF OF MEXICO S OF 22N W OF 87W .TONIGHT...E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .WED...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .WED NIGHT...E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .THU...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .THU NIGHT...E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .FRI...SE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .FRI NIGHT...E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .SAT...E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .SAT NIGHT...E WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .SUN...E WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .SUN NIGHT...NE WINDS 10 TO 15 KT. SEAS 3 TO 4 FT. GULF OF MEXICO E OF 87W .TONIGHT...SE WINDS 10 TO 15 KT. SEAS 2 FT OR LESS. .WED...SE WINDS 10 TO 15 KT. SEAS 2 FT OR LESS... BUILDING TO 3 FT IN THE AFTERNOON. .WED NIGHT...SE WINDS 10 TO 15 KT. SEAS 2 FT OR LESS. .THU...SE WINDS 10 TO 15 KT. SEAS 2 FT OR LESS. .THU NIGHT...SE WINDS 10 KT. SEAS 2 FT OR LESS. .FRI...E WINDS 10 KT. SEAS 2 FT OR LESS. .FRI NIGHT...NE WINDS 10 TO 15 KT. SEAS 2 FT OR LESS. .SAT...NE WINDS 10 KT. SEAS 2 FT OR LESS. .SAT NIGHT...NE WINDS 10 TO 15 KT. SEAS 2 FT OR LESS. .SUN...NE WINDS 10 KT. SEAS 2 FT OR LESS. .SUN NIGHT...NE WINDS 10 KT. SEAS 2 FT OR LESS.