We had something like this back in September in No. California.
Several of us flew from the Sacramento area to Oceano, a little over
200 nm. We had a 25-30kt headwind all the way down...but like Jay,
smooth as glass, even crossing the 1000-2000 foot hills from the
Central Valley to the coast. Very strange; we were all braced for
moderate turbulence over the Coast Range.

Of course, the very next day on the return trip we had *another*
headwind, but a more normal few knots.