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FORECASTS OF WAVE HEIGHTS DO NOT INCLUDE EFFECTS OF WIND DIRECTION RELATIVE TO TIDAL CURRENTS. EXPECT HIGHER WAVES WHEN WINDS ARE BLOWING AGAINST THE TIDAL FLOW. ANZ536-220745- TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND- 256 PM EST SAT NOV 21 2009 TONIGHT N WINDS 5 KT. WAVES LESS THAN 1 FT. SUN N WINDS 5 TO 10 KT. WAVES 1 FT. SUN NIGHT NE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF RAIN. MON NE WINDS 10 TO 15 KT WITH GUSTS TO 20 KT. WAVES 1 FT. RAIN LIKELY. MON NIGHT N WINDS 10 KT. WAVES 1 FT. A CHANCE OF RAIN. TUE N WINDS 5 TO 10 KT. WAVES 1 FT. TUE NIGHT NE WINDS 5 KT. WAVES LESS THAN 1 FT. WED SE WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS. THU W WINDS 5 TO 10 KT. WAVES 1 FT. A CHANCE OF SHOWERS. $$