Yesterday I flew on UA426 from DEN-COS. Aircraft was an A-319. We departed late after our aircraft came in from somewhere (not Jackson Hole as was scheduled since that leg was cancelled); we took off at about 4:40 p.m. The flight was quite bumpy due to thunderstorms and our low altitude (only about 10,000 feet, which is typical for this short flght).
As we descended at about 4:55 p.m. I noticed the very unsettled sky and lots of bumps but nothing too weird. At about 1,500 feet (approaching 35L I presume) the engines went to full power but the sensation was weird, like we weren't really speeding up or climbing for about 10 seconds. Then we pulled up sharply to the left and climbed a few thousand feet.
The captain came on and informed us that "the wind shifted around to behind us so we'll go around and land into the wind from the other direction." Out the window was lots of blowing dust, rain and wind. We came in from the south and landed on 17R.
Was this the wind shifting, wind shear or a combination of both? I've had go-arounds but they were due to other aircraft on the runway, not weather.
So my last mainline UA flight DEN-COS (Oct. 30 is the last day of mainline service at COS) was memorable! This was sort of scary, but unusual and a tiny bit fun.
[Edited 2006-10-05 00:38:56]