FROPA. An old weather term for "frontal passage".
The morning started off sunny and warm with a light southwest breeze. Soaking up the sun in shorts and no shirt I slowly passed Fort Monroe against an incoming tidal flow. Passing the beaches with sails balanced my little Catalina 27 was holding a course on its own. With everything under control, I quickly went below to grab a lunchtime snack. As always, everything goes well until you look away for a second. Before I could get back into the cockpit the boat was turning. Clouds slowly approaching from the north had moved overhead and the light southwest breeze had reversed direction and was now coming from the north. Within a few minutes the air temp dropped from near 80 to mid-60's as the wind increased to 20 knots. Classic cold front passage! Partly cloudy skies and a nice breeze for the rest of the day.