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Thread: Soaring the Mendos on 7-26-20

  1. #1
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    Soaring the Mendos on 7-26-20

    My ramblings about the plan to fly tomorrow. Look'n at the RASP charts.

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    1. BL Top - fantastic day? maybe.....


    2. H Crit - it really drops off compared to BL Top (chart 1).


    3. Surface winds - nice convergence suggested - but that is surface only!

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    4. winds at 10,000 ft all from the SE


    5. wind at 5,000 from S - from goat to black butte - but going downhill away from the ridge from goat to yolla- yikes! Tricky part will be getting past Sheet Iron.


    6. Soundings at Goat and


    7. sounding at Black Butte...

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    need to continue this thread with a new post in order to keep the graphics together...
    Peter Kelly

  2. #2
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    Re: Soaring the Mendos on 7-26-20

    continued from above...

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    8. Some clouds to mark the lift that is up high, but see the sink (chart 4-blue shading 50 to 100 fpm down) on the east side of those clouds at yolla peak. charts 9a and 9b in combo with chart 4 paint the picture pretty well.


    Good day to fly? Yes, but you must be in the right spots to catch the rising air.


    The "lift band" varies tremendously based on your geographic location. keep a close eye on the wind direction as you go, 'cause the lift will vary a lot based on your altitude and the terrain up wind of you.


    Know before you go - study the RASP charts.
    Peter Kelly

  3. #3
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    Re: Soaring the Mendos on 7-26-20

    Saturday night update. Earlier today they were 33 hour forecasts, but now they are 21 hour forecasts.

    Generally about the same as earlier, maybe a little bit stronger lift.

    The convergence line is looking more promising, so I include it here.
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    I'll plan the route tomorrow morning - not that it will be any different than usual.
    Peter Kelly

  4. #4
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    Re: Soaring the Mendos on 7-26-20

    Sunday morning - the day of my planned flight.

    RASP charts are not promising - for a variety of reasons.

    If I were not flying a motor glider, I'm not sure I would take a tow to Goat, but I do have the motor, and there is the very real possibility that the warm air coming up the SW slope of goat might form a thermal or two along the ridge, and it might hold together to allow us to venture over to snow at 8,500 ft. Not sure I'll be able to transition to any thermals north of Snow. The wind shift, as displayed on the Goat Sounding, shows a shift from SW to E, increasing to over 10 kts above 9,000. Without support, it will be difficult for thermals to get through that wind shift.

    But... the real reason I am going to take a tow is that I have this opportunity to have my grandson Connor in the back seat. It would be easy to break away and get philosophical at this point - an easy transition, but I need to get ready to leave the house and drive to the gliderport.
    Peter Kelly

  5. #5
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    Re: Soaring the Mendos on 7-26-20

    Post flight debrief.

    As it turned out, it was another fantastic soaring day at Williams Soaring Center.


    From 10 AM until 1 PM the sky was very hazy , no cu in sight near goat, which we could barely see at 12 noon due to the poor vsby.


    At 1:15 we decided to go for it - and were in the air at 1:35. Lucien gave us a smooth tow to tree farm and let us go just as the first cu was forming between Goat and Lets Lake. That thermal took us to over 10,500. After passing Sheet iron at 10,000 we experienced some massive sink, driving us down to a bit below 8,000 some 5 miles SW of Alder Springs, but we climbed in strong lift up to 12,000.... north of that it was all well formed cu. My best guess is that the wind was SW at lower altitudes with thermals starting on the top of the west facing ridges. as the thermals rose, they seemed to bend back from east to the west. As I looked at the various clouds they were wind swept from the east, slanting to the west and the western edges often had a pronounced look of decaying clouds. It kinda fit with the RASP fcst.
    Good day to take my grandson along and let him practice flying.Click image for larger version. 

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ID:	5783 Clouds continued to the south, but we choose to start the final glide from Black Butte. We landed a bit before 5 PM for a total of 3 hrs and 26 minutes in the air. A memorable day.

    Flight is posted to OLC.. Click image for larger version. 

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    See it at... https://www.onlinecontest.org/olc-3....l?dsId=8036879
    Peter Kelly

  6. #6
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    Re: Soaring the Mendos on 7-26-20

    Couple of snap shots to show the sky

    On tow at about 1:45 PM, just below 3,000 ft, as we pass over Charter's. Not much lift indicated ahead,,,,,

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    But if you look carefully to the north - through the poor vsby, you can see the clouds up near Yolla Peak

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    A hour later we were back approaching the clouds near Black Butte. This is looking to the NNW. Cloud base was above 12,000, pretty much as forecasted on the RASP.


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    Peter Kelly

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