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  • April 16, 2021 at 9:04 AM in reply to: General Member Meeting Minutes – April 2021 #11960
    Alan Crouse
    General Member

    Re: insurance, Gary is correct.  The policy is available online to all USHPA members and refers to both the flight proficiency rating and special skill endorsements of the pilot.  Also could be under the supervision of an instructor.

    March 25, 2021 at 9:28 PM in reply to: RASP & Windgram Upgrades #11745
    Alan Crouse
    General Member

    “The scales seem to be messed up on BLtop and BLdepth too.”  The problem turned out to be that some of the scales were pre-set to specific values.  I’ve changed them to scale according to the output values.  If some of them look better the other way, please let me know.  Easy to switch now that the reason has been identified.

    March 23, 2021 at 6:22 PM in reply to: RASP & Windgram Upgrades #11735
    Alan Crouse
    General Member

    Today I think we just about figured out the issue with the SRTM data.  Waiting on confirmation from the Netherlands.

    Also, the Meteograms are now available from the Windgram site.  Radio button to switch between the two formats.

    March 22, 2021 at 2:02 PM in reply to: RASP & Windgram Upgrades #11730
    Alan Crouse
    General Member

    I see what you mean.  The actual point values seem correct (available from right click), but the scale tops out way too early and a lot of area is at the top color.  Probably a holdover from the work done in Europe.  The data is converted, but the scaling itself needs to change.  Having a top of 3000 is ok when it is meters, but not when it’s feet…

    March 22, 2021 at 7:46 AM in reply to: RASP & Windgram Upgrades #11723
    Alan Crouse
    General Member

    I made some changes yesterday that are reflected in today’s Windgrams.  We now have data well below Kagel’s peak.   It required some modification of the underlying model and removal of the SRTM elevation data, so a non-trivial issue.  Still in communication with the gurus in the Netherlands to try and get the SRTM data working.

    March 18, 2021 at 9:00 PM in reply to: RASP & Windgram Upgrades #11706
    Alan Crouse
    General Member

    Vrezh:

    Glad to hear from you.  I see exactly what you mean.  I’ve reached out to the network of experts to see what options exist…

    Thank you,

    Alan

    March 18, 2021 at 2:14 PM in reply to: RASP & Windgram Upgrades #11703
    Alan Crouse
    General Member

    Today’s (and +1, +2 day’s) Windgrams and RASP data came from the new model. First complete unattended run was last night.  Little more fiddling to do, including modifying the Windgram interface to make the Meteograms visible.  Both Windgrams and Meteograms are generated now by the standard runs.

    In other news, the Soaring Predictor charts have been running  off weatherapi.com data for the past few weeks.  Looks like NWS has shut down the XML data source that has driven the charts for over a decade.  They have a new option, but it will take some significant coding to convert.  Three day outlooks in the interim.

    Any feedback on the addition of wind-gust to the site detail pages?

    – Alan

    March 11, 2021 at 8:03 AM in reply to: RASP & Windgram Upgrades #11621
    Alan Crouse
    General Member

    I’ve modified the (not yet in full production) Docker image to produce both the old Windgram format and the new Meteogram format.  I’m thinking I could add a button on the windgram web page to let folks choose.  Running both models isn’t really a long term option, but I’m becoming increasingly comfortable with the new model results.

    The new model is currently running the late day Entire area+1 model (shows up in the RASP viewer around 8 each evening for XC planning).  Everything else you see is still the older product.

    March 8, 2021 at 5:18 PM in reply to: RASP & Windgram Upgrades #11596
    Alan Crouse
    General Member

    Here’s today (3/8) old model, old format and new model, new format.  Mostly to show the new format’s handling of clouds and cloud cover %.

    Old model, old format:

    N_SCAL_Marshall_windgram_old

    New model, new format:

    N_SCAL_Marshall_windgram

    March 7, 2021 at 2:03 PM in reply to: Need white x picture #11585
    Alan Crouse
    General Member

    Here’s an actual deployment from Aug 2020:

    https://crestlinesoaring.org/wp-content/uploads/hm_bbpui/10103/wrq35v9z65qt3oy60lbaq6xdu64uzt01.jpg

    March 7, 2021 at 8:48 AM in reply to: RASP & Windgram Upgrades #11570
    Alan Crouse
    General Member

    Same deal today (3/7):

    – Old model, old format

    – New model, old format

    – New model, new format

    I noticed there were some elements missing from yesterday’s new format version.  Fixed that today.  Same pattern as yesterday, not a lot of difference, but the new model predicts warmer temps and higher altitudes.

    Old model, old format:

    N_SCAL_Marshall_windgram_cur

    New model, old format:

    N_SCAL_Marshall_windgram_old

    New model, new format:

    N_SCAL_Marshall_windgram_new

    March 6, 2021 at 9:56 AM in reply to: RASP & Windgram Upgrades #11547
    Alan Crouse
    General Member

    Today (3/6) for comparison we have:

    – Old model data presented in old windgram format

    – New model data presented in old windgram format

    – New model data presented in new windgram (meteogram) format

    All are from the same source data. I see only slight differences in the model predictions though the new model is (once again) more optimistic regarding altitudes…

    Old Model, Old Format

     

    N_SCAL_Marshall_windgram-Old-Model

    New Model, Old Format

    N_SCAL_Marshall_windgram

    New model, new format

    meteogram_Marshall

    March 5, 2021 at 7:44 AM in reply to: Altitude caution advisory #11528
    Alan Crouse
    General Member

    I’ve been back in the passenger area on several late-day flights from OAK to ONT that seemed to fly a diagonal route down the Cajon Pass.  We were looking up at the ridgeline…   That approach seemed to happen more frequently on north wind days, which always struck me as odd…

    March 1, 2021 at 7:32 AM in reply to: T2C Tip Wand replacement needed #11436
    Alan Crouse
    General Member

    Wills Wing is an hour away in Orange County.  Bet they have some :-)

    Wills Wing – Hang Gliding Equipment

    Telephone: 714-998-6359

    February 24, 2021 at 8:20 AM in reply to: RASP & Windgram Upgrades #11399
    Alan Crouse
    General Member

    I ran today’s (2/24) as there is a truck running and it should be flyable.  There are some differences in the forecast:

    – New windgrams are more optimistic about the top of lift

    – New windgrams are more pessimistic about the wind direction and forecast stronger winds later in the day.  N_SCAL_Marshall_windgramN_SCAL_Marshall_windgram_new

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