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Thread: Oct 13, Thu: Wave Alert

  1. #1
    Join Date
    Jan 2011
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    Menlo Park, CA
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    Oct 13, Thu: Wave Alert

    This setup was in the works for the last ten days, but I was reluctant to say anything until now. Thu is looking fairly close to the Sept 29, 2013 "Williams Arch" day of a few years ago:
    https://www.williamssoaring.com/news/...-WX-Sept-28-29

    Thu morn:
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    This is the first in a series of two strong & slow moving fronts. This first front passes thru WSC Friday early morning with rain, and the second passes early Monday morning. So Sat & Sun look good for post frontal thermal & possible wave.

    But as many of us know, just like the first press of the grapes for wine, so the first front is better pre-frontal wave than a close following second due to the unstable layer being deeper for the 2nd front.

    Russ Pillard & I are flying FNX with possibly a couple other pilots, TBD.

    What's interesting to me, riffing off of my earlier post on extending the known XC wave lift:
    https://www.williamssoaring.com/news/...XC-wave-flight

    is to aim for Hoopa using what I think is the likely wave off of the South Fork Trinity River ridge. The transition is from T-15 to the Silver Creek strip, then go NW from there. AFAIK, no glider has ever been out there in wave, so we will find out. If it works, then we go south to Vacaville, then back NW to around Hyampon as the rain is likely to shorten the NW leg, then back to Vacaville for 1000km:
    Click image for larger version. 

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    That's the fantasy plan for now anyway......
    Last edited by Kempton; 10-10-2016 at 09:49 AM.
    Kemp
    ASH-25 (FNX)

  2. #2
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    Re: Oct 13, Thu: Wave Alert

    Update as of Monday morning:

    Thu early morning
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    Little change, although afternoon 500 mb winds have strengthened a bit:
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    Ground winds look to be straight out of the south at sunset, with the early morning 12 knots out of the SSE, so likely a southerly launch.
    Tonight's RASP will give us more detail on the wave specifics.
    Kemp
    ASH-25 (FNX)

  3. #3
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    Re: Oct 13, Thu: Wave Alert

    Mixed update, + for a later start to the precip up north:
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    - for the more southerly winds at ridge level up north, but that doesn't seem to stop the wave:
    Click image for larger version. 

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    and the air is bouncy, but only one wave, no propagation downwind:
    Click image for larger version. 

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    and it gets better as the day goes on:
    Click image for larger version. 

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    Precip doesn't arrive till late Thu night/early Fri morning. I'll post in a separate thread for the Fri thru Sunday period, which is very dynamic.
    Last edited by Kempton; 10-11-2016 at 01:39 PM.
    Kemp
    ASH-25 (FNX)

  4. #4
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    Re: Oct 13, Thu: Wave Alert

    Looks like FNX launched around 8AM but I don't see them on the SSA tracker. Are they flying with inreach or spot?

    Ramy

  5. #5
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    Re: Oct 13, Thu: Wave Alert

    Kempton has Mayes Delorme

    https://share.delorme.com/NoelleMayes

    You will need to limit the filter to todays date.

  6. #6
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    Santa Rosa, CA
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    Re: Oct 13, Thu: Wave Alert

    Kempton,

    You had a Really Good flight for mid October, or any other summer day.

    Here is Kempton's flight trace, from the Inreach site.

    Click image for larger version. 

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    Last edited by Larry Roberts; 10-14-2016 at 09:16 AM.
    ~ Larry Roberts

  7. #7
    Join Date
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    Re: Oct 13, Thu: Wave Alert

    Nice flight! Thanks for sharing!
    Ginny Farnsworth G3
    Past President
    Valley Soaring Association

  8. #8
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    Re: Oct 13, Thu: Wave Alert

    The flight was Kempton's, I forgot to say that and have updated my post.
    ~ Larry Roberts

  9. #9
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    Re: Oct 13, Thu: Wave Alert

    Larry,
    Got that, and appreciated you posting the trace.
    Ginny Farnsworth G3
    Past President
    Valley Soaring Association

  10. #10
    Join Date
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    Re: Oct 13, Thu: Wave Alert

    As expected, it was an adventure with (fortunately) no drama. With Russ Pillard as co-pilot, we launched at 8:35a, thanks to Hugh. Russ had only local experience with wave, so to go wave cross country is a first for him

    The forecast was spot on, as it conveniently slowed down with the day slowly drying out as the system moved in:
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    with wave structures evident as we tow out:
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    These alto cu would be a nuisance later in the flight:
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    We release on the NE side of St. John working 1-3 knots up to 10k, with winds from 230. I was concerned with the very southerly flow down low, but that didn't seem to affect the wave, other than making it less strong than if all levels were aligned. Topping out, we head north along the leading edge of the lennies shown earlier:
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    Some wispy lower level lennies were in the south Yolla area:
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    And those alto cu? They were around the 15k level, forecast by the sounding, and they seem to disrupt the wave flow as they passed, which you'd expect as they are a symptom of instability. My explanation is that there are blobs of instability, just like there are blobs of moisture, so they pass thru, and once past, things go back to "normal" which in this case was a stable, wavy day. But they are at our cruise altitude, so you just have to go around them as they go thru.

    At T15 we got a good climb to 17k, then decided to attempt to move up wind:
    https://drive.google.com/open?id=0B2...kpfWDZfTU4temM

    Well, that didn't work, see the igc file, so we retreat and climb again:
    https://drive.google.com/open?id=0B2...jIyd2p5VERYdjA

    The attempt towards our newly declared closer in goal of Hyampon was to go downwind to a nice wave structure near Hay Peak, go west, then cut back up wind. That worked, so we run the downwind side of the "foehn channel" towards Hyampon (wind L to R):
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    At Hyampon, I kinda can't believe we made it, and, as the video shows, the direction to Hoopa was pretty dark and thick with clouds, so we declare victory and turn around:
    https://drive.google.com/open?id=0B2...WZLeFk4ZFdzM2M

    I mistakenly state that the route back was to T15, when in fact the leenies & foehn gap I saw was really south of Yolla. Since there wasn't much visibility to the ground, it's easy to get misoriented. This wasn't unsafe as, out of view behind the wing, it's clear in the Redding area downwind, but INcorrectly identifying the holes at a distance can easily occur:
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    A traditional turn point shot of the Hyampon airport:
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    Now at the Yolla wave spot, I figure out where I'm at, and also to correlate the upper level lift to the much lower structures:
    https://drive.google.com/open?id=0B2...25sNEFlV1lIMEU

    Approaching the Anthony lennies, more explanation of the situation:
    https://drive.google.com/open?id=0B2...XBxc0NVQW00YzQ

    Climbed in front of those lennies, and continued south back to St. John where we can see enough of structure south of Clear Lake to go down there perhaps for a way to Fairfield for max distance. SW of Clear Lake, we find this foehn channel going south:
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    and it works:
    https://drive.google.com/open?id=0B2...20xanNhcTZGVTg

    so we run down to west of Berryessa, then it weakens so we head back to the Capay Valley to show Russ the wave there. The Rumsey ridge-to-wave transition was also working, so we did that, and capped the day off with a run down the Cortina ridge and home. 8.2 hours, and a great refresher for me, not to mention getting as far north as we did. By far the longest flight for Russ, and he enjoyed it.

    OLC trace. Note that the trace started about 5 minutes after launch as we needed to use Russ' iGlide app on his iPhone as my 302 died:
    http://www.onlinecontest.org/olc-2.0...l?dsId=5454946

    Many thanks to Rex & Noelle for their support, Hugh for the tow, and Russ for being an enthusiastic and well prepared co-pilot.
    Last edited by Kempton; 11-07-2016 at 09:29 AM.
    Kemp
    ASH-25 (FNX)

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