I think all responsible mariners voyaging beyond sight of land should carry storm jibs. The 50% size range for a storm jib (approx. 10 oz. material) is a good rule of thumb. What are you supposed to do, turn the motor on when the wind pipes up to thirty knots and higher when you''re in the middle of lake Erie? I''m fairly certain that your motor is not powerful enough to move your vessel at more than 1-2 knots in these conditions. Sailing in these wind conditions (assuming the standing and running rigging is in good condition) may be your only recourse to return to safe harbor. Ignore the ill advice; you''re on the right track.