The FAA may use the diagonal runways, Thursday, 20 February 2014, between about 8:00 a.m. and noon as winds from the west and northwest in excess of 20 mph with gusts in excess of 35 mph are forecast by the National Weather Service.
If the forecast proves valid, the FAA will likely launch jet aircraft from Runway 31L over the cities of Southlake and Grapevine during all or part of that period. As soon as the wind shifts back to a more northerly direction, forecast for about noon, or the crosswind velocity decreases, jet departures over Southlake and Grapevine will cease. It is possible that Runway 31R could be used for departures as well, depending upon wind velocities. These aircraft would turn north after takeoff and track outbound as departures from the east side parallel runways normally do. It is possible that either runway could also be used to receive arriving flights.
High velocity west/northwest winds are a seasonal phenomenon and are expected at this time of year.