Weird Windshear

I cannot personally speak for the "a few hundred miles", but I have
experienced mountain wave within ten nm of the lee side of the
Appalachians in both North Carolina and Georgia.

Dave Butler wrote:
Here in NC you can get mountain waves a few hundred miles downwind from
the Appalachians, though I've never experienced anything as severe as
the OP describes. I think St Simons is too far south for Appalachian
mountain waves, though.

On Fri, 04 Mar 2005 22:16:49 GMT, jsmith wrote:

I cannot personally speak for the "a few hundred miles", but I have
experienced mountain wave within ten nm of the lee side of the
Appalachians in both North Carolina and Georgia.

Dave Butler wrote:
Here in NC you can get mountain waves a few hundred miles downwind from
the Appalachians, though I've never experienced anything as severe as
the OP describes. I think St Simons is too far south for Appalachian
mountain waves, though.

Some where around here I have some photos of lenticular clouds over
the Michigan, Ohio border taken from the company King Air.

The Pilot and copilot were remarking that was something you just don't
see around here, but there they were.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com

jsmith wrote:
I cannot personally speak for the "a few hundred miles", but I have
experienced mountain wave within ten nm of the lee side of the
Appalachians in both North Carolina and Georgia.

Maybe I shouldn't say "mountain wave". There is a definite vertical component to
the air movement where I live, about 200-300 miles east of the Appalachians in
NC, when the wind blows perpendicular to the ridges. If you're flying east-west,
you are alternately pulling and pushing to maintain altitude as you pass from
crest to trough of the waves. I'm *guessing* the time from push to pull is a
minute or so, so that would make the wavelength about 5 nm at Mooney speeds.

[Before someone else says it, yes, I know, efficiency can be improved by
allowing altitude to vary and just staying trimmed for your airspeed.]

Dave


Dave Butler wrote:

Here in NC you can get mountain waves a few hundred miles downwind
from the Appalachians, though I've never experienced anything as
severe as the OP describes. I think St Simons is too far south for
Appalachian mountain waves, though.