How does sun heat the air?

On Wednesday, December 20, 2017 at 8:42:22 PM UTC+3, wrote:
One REALLY important thing to remember though is that all the really good soaring days happen after a cold front booms through. This is particularly true in the non-desert parts of the country -- basically the only time you can get even "decent" conditions for long flights.

Yes. Or soaring the front of the front as it arrives! There is awesome lift in front of that wall of cloud. Sometimes I've done that for a couple of hours with a front that is moving at only 5 or 10 km/h. When it gets within 5 km or so of the airfield all the gliders dash back, hangar land, get everything quickly inside and close the doors. There's nothing like just getting a cup of coffee made in the clubhouse as it starts getting pounded with wind and rain five minutes after you locked up the hangar.