Average Flight Rules Map

Discussion in 'Flight Following' started by heather.hins, Dec 9, 2011.

  1. heather.hins

    heather.hins Filing Flight Plan

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  2. gkainz

    gkainz Final Approach

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  3. heather.hins

    heather.hins Filing Flight Plan

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    That will be perfect, thank you Greg
     
  4. slacktide

    slacktide Line Up and Wait

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  5. CJones

    CJones En-Route

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    Wow.. That's interesting. I'm surprised at how similar the trends are from year to year.
     
  6. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    Last edited: Dec 9, 2011
  7. gkainz

    gkainz Final Approach

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  8. dbman5

    dbman5 Pre-Flight

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    Something doesn't look kosher about those charts. Many of them seem to show far more sun at the beginning and end of the month than at the middle of the month. The overall seems reasonable but the details just don't look right to me.

    Am I reading them wrong?
     
  9. Jeanie

    Jeanie Pattern Altitude

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    Dave, I just used one of the other ones and backspaced to the k and put in e38. Not much IFR here!
     
  10. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    the prob was a fwd slash instead of a backslash in the code. :)
     
  11. Jim Logajan

    Jim Logajan En-Route

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    I think there is something wrong with them. Which is a shame, since they'd be interesting otherwise.
     
  12. Artiom

    Artiom Pre-takeoff checklist

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    I noticed that too. Interesting:confused:
     
  13. azure

    azure Final Approach

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    I think so too. In addition to what dbman5 pointed out, I noticed that the entry for PTK shows consistently much, much more IFR at PTK than at VLL, less than 15 nm away. It can't be right.
     
  14. cessna182b

    cessna182b Line Up and Wait

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  15. xsamat

    xsamat Filing Flight Plan

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    Let me introduce myself.
    My name is Xavier and I created www.aviador.es and those charts you refer to.

    There's nothing wrong with the charts, except for the fact that they are not well explained.

    Let me try here:

    What you see for each month is not the progression day by day, but the conditions charted by hour of day. (If you'd count the bars, each month would have 24 and not 30 or 31)
    For each airport you will see an individual chart on top representing the current months' data, hour by hour.
    Underneath, you'll find the same information for the past months, only that the chart has been tilted to the right.
    That's why you see those patterns; because there is more IFR nearing dusk or dawn than in noon when the sun is heating.

    BTW, have you seen the prevailing wind statistics? I love those! Find an example at: http://www.aviador.es/Weather/Wind/KROC-9
    I think you'll love it. You can see, month by month, the prevailing winds for your favorite airport superimposed on a google map.

    Hope you like it.
     
  16. xsamat

    xsamat Filing Flight Plan

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    There are quite a few reasons why two close-by airports could have very different percentages of IMC conditions.

    Namely:
    • proximity to a water mass (lakes, sea...)
    • field elevation, temperature...
    • Mountain configuration nearby
    • Equipment calibration
    • The weather observer
    • ...

    In any case, the charts just represent what the METARs reported.
     
  17. xsamat

    xsamat Filing Flight Plan

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    My first message was lost.
    Let me introduce myself. I am Xavier the creator of www.aviador.es.

    There's nothing wrong with the charts, except for the fact that they are not well explained.

    What you see within each month are the hourly statistics, not daily. If you'd count the number of bars, you'd find 24 and not 30 or 31 (well, that would be for an airport that has a 24h weather observer)
    In other words: take a look at the topmost chart, you'll see the hour labels in the horizontal axis. Tilt that chart to the right, and that's what will go to the year statistics at the end of the month.

    The reason why you see patterns is that there's more IMC near dusk or dawn than near noon (because of the heating from the sun). Remember that the hours are UTC, and therefore you have to account for the time difference from your airport to GMT.

    When I created the chart I thought it made a lot more sense to show the information this way.

    BTW, take a look at my other favorite airport statistic: the prevailing winds.
    Find an example here: http://www.aviador.es/Weather/Wind/KBOK-9
    (this AD -Brookings- does have dependable IMC...)
     
  18. Jim Logajan

    Jim Logajan En-Route

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    Xavier - thank you for coming here to explain how to read the charts. It now makes sense and I do like it and appreciate it.
     
  19. cessna182b

    cessna182b Line Up and Wait

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    I'll second that - a very worthwhile effort. Thanks!

    Dave
     
  20. gkainz

    gkainz Final Approach

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    Hi Xavier! Glad to read the explanation ... I found your site through a google search a while back for quick access to weather on mobile phones (blackberry for me).
     
  21. sessionthree

    sessionthree Filing Flight Plan

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    Oh wow, I love this! Very interesting!
     
  22. azure

    azure Final Approach

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    Xavier, thank you for explaining your chart format. It does make sense now, but I'm still not convinced that the data represented is accurate.

    Of course. But the reason I mentioned those particular airports is that none of those usual reasons apply to them (except maybe equipment calibration). I am based at VLL and very often compare weather observations at my home field and at PTK. I have never noticed that reported conditions at PTK are consistently lower than at VLL and would be very surprised if that were true.
     
  23. Artiom

    Artiom Pre-takeoff checklist

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    Hello Xavier,
    Thanks for introducing yourself and welcome to PoA, and thanks for the great job you did collecting statistics and putting it on the web. It is priceless tool.
    However as you can see format you choose confused many people. I would suggest you to change format to what most people expect - daily distribution as on top graph or put a good explanation on ow to read those graphs.
     
  24. xsamat

    xsamat Filing Flight Plan

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    I'll think about it and maybe put a better explanation on how to read them. Or maybe I'll make them simpler by giving just %VFR, %IFR, etc for each month (just one chart, not a chart for each year) Then, I could make each month clickable and display more detailed statistics for each month...

    I understand most people expect the chart to be what they would display. I bet most people don't even read what's explained on top of the charts. But, honestly, I don't see any value in displaying what was the percentage of each condition on a particular day say... three years ago. Instead, It is interesting to see what the percentage of each condition was hour by hour. But I agree, now it is kind of difficult to see that just by intuition.

    As I said, I'll think about it and let you know.
    Best.
     
  25. xsamat

    xsamat Filing Flight Plan

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    Hi guys,

    After much thinking, I've reached a conclusion. Take a look at your favorite airports and let me know what you think.
    I decided to show only one chart with monthly statistics. I think it is much clearer now than before. But now we've lost hourly statistics (which I may decide to include in a new page in the future)
    I've also included the 'overall' statistics at the bottom of the page.

    Wondering which are the worst/best?
    Here are the 30 worst weather stations in the US (some are not airports)
    Percentage shown is % VFR+MVFR

    KSMP 35.1 % http://www.aviador.es/Weather/Flight_Rules/KSMP
    KMLP 40.0 % http://www.aviador.es/Weather/Flight_Rules/KMLP
    KMWN 40.5 % http://www.aviador.es/Weather/Flight_Rules/KMWN
    KSXT 48.1 % http://www.aviador.es/Weather/Flight_Rules/KSXT
    PASN 51.3 % http://www.aviador.es/Weather/Flight_Rules/PASN
    KBOK 52.1 % http://www.aviador.es/Weather/Flight_Rules/KBOK
    PAMO 55.5 % http://www.aviador.es/Weather/Flight_Rules/PAMO
    PATQ 55.6 % http://www.aviador.es/Weather/Flight_Rules/PATQ
    PAPB 56.1 % http://www.aviador.es/Weather/Flight_Rules/PAPB
    PASC 56.8 % http://www.aviador.es/Weather/Flight_Rules/PASC
    KVBG 56.9 % http://www.aviador.es/Weather/Flight_Rules/KVBG
    PABR 57.0 % http://www.aviador.es/Weather/Flight_Rules/PABR
    PACM 57.1 % http://www.aviador.es/Weather/Flight_Rules/PACM
    PAQT 57.2 % http://www.aviador.es/Weather/Flight_Rules/PAQT
    PABA 57.4 % http://www.aviador.es/Weather/Flight_Rules/PABA
    PAVC 57.9 % http://www.aviador.es/Weather/Flight_Rules/PAVC
    KLSF 58.0 % http://www.aviador.es/Weather/Flight_Rules/KLSF
    PAKI 58.0 % http://www.aviador.es/Weather/Flight_Rules/PAKI
    PASY 58.2 % http://www.aviador.es/Weather/Flight_Rules/PASY
    KAVX 60.2 % http://www.aviador.es/Weather/Flight_Rules/KAVX
    KACV 60.3 % http://www.aviador.es/Weather/Flight_Rules/KACV
    KVOK 62.2 % http://www.aviador.es/Weather/Flight_Rules/KVOK
    KQAY 63.1 % http://www.aviador.es/Weather/Flight_Rules/KQAY
    PAJZ 63.3 % http://www.aviador.es/Weather/Flight_Rules/PAJZ
    PAOO 63.5 % http://www.aviador.es/Weather/Flight_Rules/PAOO
    KCEF 63.5 % http://www.aviador.es/Weather/Flight_Rules/KCEF
    KUIL 63.7 % http://www.aviador.es/Weather/Flight_Rules/KUIL
    KJST 64.0 % http://www.aviador.es/Weather/Flight_Rules/KJST
    PAOU 64.1 % http://www.aviador.es/Weather/Flight_Rules/PAOU
    PAMB 64.2 % http://www.aviador.es/Weather/Flight_Rules/PAMB


    Enjoy !
     
  26. TangoWhiskey

    TangoWhiskey Touchdown! Greaser!

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  27. gkainz

    gkainz Final Approach

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  28. denverpilot

    denverpilot Taxi to Parking

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    You might have to subtract a few 35G50 days a year at KBJC from those VFR days to make a "flyable weather" chart, though! ;)
     
  29. xsamat

    xsamat Filing Flight Plan

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    Well, you know you CAN see Wind Statistics, too.

    Check this out (Wind Map Overlay)
    http://www.aviador.es/Weather/Wind/KFTW-9
    http://www.aviador.es/Weather/Wind/KBJC-9

    Don't forget to check the other wind stats. You have:
    • Frequency distribution (how many metars for each direction)
    • Wind Profile (how many metars * how strong for each direction)
    • Average Wind
    • Max Wind

    What we don't have (yet) is when the wind was such and such under VFR conditions.

    Hope you enjoy them!
     
  30. xmuerte

    xmuerte Filing Flight Plan

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    I was getting increasingly concerned that I was going crazy... I kept reading about these hourly charts and checking the website and saying to myself, "AM I MISSING SOMETHING?". Then finally I figured out you changed them. I'd be curious to see them by hour as well.

    Great website!
     
  31. Let'sgoflying!

    Let'sgoflying! Touchdown! Greaser! PoA Supporter

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    where is KSMP? KMLP? KMWN? KQAY?
    not finding on airnav

     
  32. TangoWhiskey

    TangoWhiskey Touchdown! Greaser!

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    Mountain weather reporting stations.... He didn't say they were airports. ;-). KSMP is Stampede Pass... I know that one from my Pacific NW days.

     
  33. xsamat

    xsamat Filing Flight Plan

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    You can now see hourly information for each month (Jan to Dec):goofy:
    How?
    Just click on the months' name on the Yearly Chart.

    To go back to the yearly chart, click anywhere on the monthly chart.

    If you want to see a beautiful one, check Brookings in August: http://www.aviador.es/Weather/Flight_Rules/KBOK-08
     
    Last edited: Mar 14, 2012
  34. bobmrg

    bobmrg En-Route

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  35. bobmrg

    bobmrg En-Route

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    First, Xavier, let me add my thanks to you for your efforts.

    Not surprised to see KUIL on the list because it is on the northwest coast of the Olympic Peninsula, close to the Hoh Rain Forest (duh). Just a strip of concrete...no facilities at all. Probably fewer than 50 flight operations per year. Glad to see that none of the airports in the Puget Sound area made the list.

    Bob Gardner
     
  36. xmuerte

    xmuerte Filing Flight Plan

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    What do you think about putting the exact percentage of each bar in the tool tip when the cursor hovers? Just a thought. It's great either way.
     
  37. poadeleted21

    poadeleted21 Touchdown! Greaser!

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    Not real sure what to make of that, we have a 5 month inversion cloud over the valley in winter, yeah sure it might be VFR technically but given the 6,000' wall around the airport you're not going anywhere far from the pattern VFR. I rarely even attempt Cross country flights between October and April.