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  #1  
Old 09-27-2010, 02:22 PM
RVbySDI's Avatar
RVbySDI RVbySDI is offline
 
Join Date: May 2005
Location: Tuttle, Oklahoma
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Default Have you ever run into these before?

Ok, this past Saturday I was up in the late morning continuing my Phase I flying task of calibrating my fuel flow instrumentation. My normal modus operendi for this task has been to fly a specific flight path from my home airport over several local airports in a great big circle that ultimately gets me back to my home airport in a little over an hour.

My path usually takes me from 53OK(my home airport, grass strip and all) to KOJA (maybe some of you recognize the identifyer, but in case you don't, think LOE). Then westward to KCLK (Clinton, OK), over KCSM (If you click on the link notice the dimensions for 17L/35R). From here I turn back SE towards KHBR (Hobart, OK) then eastward to KCHK (Chickasha, OK) and then back home to 53OK.

All in all, at least as far as Oklahoma goes, this flight path takes me over some fairly nice scenery. Granted I cannot give it the kudos due a flight over the Rocky Mountains or perhaps the Grand Canyon but we do have the Wichita Mountains to view off in the distance and we have a great many giant wind generators that are stretching out across the entire western half of the state now a days that is quite interesting to look at in flight.

Given this, however, I was really focusing my attention to the task at hand. Take that to mean I was staring at the instruments and turning dials. I was working on stabilizing my flight, getting the engine leaned out to the appropriate LOP operating parameters (click on the pic below to see the EGT, CHT temps, fuel burn, etc. on the GRT HX display.) and writing down my observations.



Well, if everyone is still with me, you may notice on the Garmin 695 GPS in the picture above you can see I was just SE of KOJA a few miles with a flight plan in the GPS tracking toward KCLK about 20 miles away. Ok, so I figure, I have had my head inside the cockpit too long now. How about looking out the window to see what was going on outside now that the airplane is stable at altitude, "George" is steady as a rock flying the plane and I have the engine purring along LOP fine and dandy.

So, out the window I gaze. Well now, that is very interesting. . . How often has anyone seen this outside their windshield?



Ok, I'm not talking about the dark lines on the left side of the picture. No, that is my I-phone camera's bad attempt to capture a moving prop at 2300 RPM. How about those clouds out in front of me? Sure don't see those too often out here in the western plains of Oklahoma. I had thought Lenticular clouds usually formed in the mountainous areas of the country. Although we have some areas just south of this pic we Oklahomans call mountains, I am not sure they would really qualify. I am pretty sure they would not qualify enough to be responsible for forming these at any rate.

Never the less, there they were. Directly over the Weatherford Stafford airport (KOJA). Home of LOE that will be held exactly one week from this very moment directly below those very pretty clouds. The clouds had been very strange throughout that morning for sure. There were several layers of clouds scattered all over the visible sky as I flew that morning. There was a scattered layer around 2900 feet, a distinct layer in the distance to the south around 4500 feet, high cirrus clouds up higher and these. Right in the direct line of my flight path. In fact I would be flying just under them maybe 100 or 200 feet below. Here are some closer pictures as I flew just a few hundred feet below and maybe less than 1/2 mile in front of the leading cloud.





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Well that was not going to due for me. All you soaring junkies can call me a wimp if you want but my mission for the day was requiring some stable air and uneventful flying so I can get some good readings from my instruments. The idea of turbulence and rising air did not play into the equation. So, I aborted my westerly heading. I turned NE, to avoid what would have most likely been a very interesting flight, and skeedaddled (for the uninitiated, that is a southern term for "hurry up and get your butt out of there")!

Like I said, all you soaring aficionados can say what you want about my decisions but for this phase of my flying I want no part of these things. Especially if I end up 100 feet directly below them.

Well, there is my weekend story. Just thought I would relay this story as I found it very interesting to come face to face with something that really doesn't happen that often in our part of the woods.
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  #2  
Old 09-27-2010, 03:04 PM
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airguy airguy is offline
 
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Don't know about Saturday, but Sunday around lunchtime I flew from west Texas into the McKinley Ranch private strip just a few miles NE from Weatherford (with a stop at OJA for fuel - it's cheap!) and the winds were north at 35 knots at 7500' and quite a bit of mountain-wave like activity. I would call it thermals except it was too smooth and too regular, this was definitely like a mountain wave, about a 4-minute period and 500-600fpm up and down. This was just about 10-12 hours after the cold frontal passage. Ground-induced bumps and thermals were evident below 6000 but it was smooth as you please at 7500, but with definite up/down waves.

Saw 168 knots groundspeed on the way home - in a 172!
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Last edited by airguy : 09-27-2010 at 03:16 PM.
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  #3  
Old 09-27-2010, 06:43 PM
RV6AussieNick RV6AussieNick is offline
 
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Location: Brisbane Australia
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Hi Steve,

It looks like Wave cloud to me, It's caused by winds setting up a wave formation over a mountain range, sail plain pilots love flying that sort of stuff as they can get very high, here is a link that might help explain what and how it is formed. It's very similar to Lenticular Cloud, just longer.

http://apollo.lsc.vsc.edu/classes/me...ouds_schem.jpg

Cheers,

Nick..
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  #4  
Old 09-27-2010, 07:55 PM
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Neal@F14 Neal@F14 is offline
 
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I've seen some that looked just like that near Graham, TX while flying back home to Wichita Falls one day in my Cherokee. It was a cool/cold windy day and somewhat turbulent, and these clouds would form and vanish and then reform within just a few seconds of each other, and they were roughly at my cruising altitude. I guess I flew into one that was starting to form but was not yet visible because I hit a sudden, abrupt bump of turbulence that made me almost hit my head on the roof of my plane with a strong jolt and bounced me around very strongly. I decided to drop my altitude well down below those clouds and not risk encountering them again
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Last edited by Neal@F14 : 09-27-2010 at 07:57 PM.
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  #5  
Old 09-27-2010, 08:44 PM
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kevinh kevinh is offline
 
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yep - definitely wave.
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  #6  
Old 09-28-2010, 08:22 AM
RVbySDI's Avatar
RVbySDI RVbySDI is offline
 
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Location: Tuttle, Oklahoma
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Default wave clouds

Yes indeed they were wave clouds! The very reason I decided not to fly under them. I was needing stable flying to do some of the testing I was doing and new full well that if I got close to those I would be bumping around pretty good.

What I thought was interesting was the fact they were where they were. Directly over the top of the Weatherford Stafford airport. There are some smaller mountain ranges about 50 miles south of Weatherford but at an elevation of 2500 MSL and the surrounding terrain roughly around 1100 MSL I can't say these are towering behemoths that would normally cause these to form. I guess other weather phenomena in addition to rising terrain could contribute to the formation of wave clouds.

At any rate it was very interesting to see them form directly over the top of our upcoming LOE airport. By the way, I hope to see you all there in 3 days.
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