First came the tornado warning two days ago, now Sky Harbor Airport (10th busiest US airport) in Phoenix has canceled all flights due to inclement weather, as of 2pm MST. Sky Harbor’s “three runways run east to west, and southerly winds in excess of 40 mph were expected Thursday afternoon. Airliners typically don’t take off or land when crosswinds are much above 25 mph.”
Sky Harbor has an average of 1,200 daily arrivals and departures. The flight cancellations will likely have a ripple effect on travel across the nation, but airlines were working to minimize that effect.