Summer Wave 17/06/17
by Alastair Mackenzie
Wave isn't always defined by long smooth lenticular couds. Take a good look at the sky - is it trying to tell you something? If cumulus clouds appear to form in bands across the wind and don't drift down wind in the usual way - its quite possible they are being formed by wave. Other clues are wedge shaped cumulus with back combing of cloud wisps over the top. If the thermals seem poor in relation to the cumulus clouds - it could be that wave is interfering with them. In such cases it can be worth a tow up on top of the cumulus - above any inversion - to look for wave. On Saturday 17th June 2017 there was 2 to 4Kt wave above 3500ft just west of Sherburn whilst the headwind was only 7 to 11Kt.