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Thread: CLoD surface wind reports

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    Supporting Member Baffin's Avatar
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    CLoD surface wind reports

    With the new Cliffs of Dover Blitz well established, it helps to review a few basics. Surface wind reporting for taxi and takeoff planning continues to have a few glitches, but it works if you know what it says.

    Wind direction in aviation is always reported relative to the direction from which the wind is blowing. e.g. A warm, south wind is 180° and that cold, north wind is 360°. Winds reported by a control tower or other airfield control agency are expressed in degrees MAGNETIC. All winds reported by enroute control agencies are expressed as degrees TRUE. To clarify the reasons for the difference, consider that all runways are marked and numbered by magnetic heading so the departing pilot can check his heading instrument when lining up for takeoff. The pilot enroute between two points uses charts that are plotted by reference to TRUE North. The chart has magnetic variation somewhere hidden in all those lines and numbers, but basic courses are always TRUE. Inflight, the pilot does not need to be juggling +West/-East numbers. Navigators can do that, or pilots SHOULD HAVE during flight planning on the ground.

    Wind speed (Velocity) is commonly expressed as (Nautical or Statute) Miles/hour or Kilometers/hour, depending on location and historical date. MPH was the RAF Standard. KPH was used by the axis. Let's forget about knots...

    So, a standard 1940 RAF Wind notation might look like: "Wind 270/5". (Wind from the West at 5 MPH).

    BUT, CLoD doesn't quite do it that way.
    When the Clod weatherman reports "90 2", what he meant to say is "270/5" or 270° at about 5 MPH.

    TAB 7 3 - In our simulator, this keyboard command requests the surface wind from the tower or other controlling agency. The report output however, is not consistent with the standard explained above. Instead of "180/4" (180° at Four MPH), this south wind in CLoD will be reported as "360 2".

    The original CLoD programmers used wind direction backwards from the accepted norm, and chose to express wind velocity in meters per second. It's another special "Feature", held over from prior versions. Do not despair, the conversion to "Ops Normal" is a simple one.

    On the compass rose, simply look at the opposite side of the circle to find the proper direction that falls between 0° and 360°. With no compass rose available, just add 180° to the reported wind direction, unless that sum is greater than 360°. If that's the case, go back and subtract 180° instead. For example:

    090° (East) reported by CLoD + 180° correction = 270° (West). That's the direction to use.

    270° (West) reported by CLoD + 180° correction = 450°. (Too much. Greater than 360!) ...so try the subtraction fix:
    270° (West) reported by CLoD - 180° correction = 090°. (East). That's where the wind is really coming from.

    With the direction corrected, we move on to the wind speed correction, which is very straight forward:

    1 Meter/Second = 2.23694 Miles per Hour. I simplify this by considering 1 M/s - 2¼ MPH.

    Therefore, drawing on our vast mathematical data banks, 2 m/s = 4½ mph, 3 m/s ≈ 7 mph, 4 m/s ≈ 9 mph, etc.

    Finally, when the Clod weatherman reports "90 2", what he meant to say is "270/5" or 270° at about 5 MPH.
    Last edited by Baffin; Dec-29-2017 at 10:15.
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    ATAG Member ATAG_Knuckles's Avatar
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    Re: CLoD surface wind reports

    Thanks Baffin: I think ???


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    Supporting Member farley's Avatar
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    Re: CLoD surface wind reports

    Baffin, thanks for that very colorful explanation!

    I do use 7 - 3 but could never figure out what the control dude was on about.... just figured he was

    So now I know, and just for the heck of it will translate his language into the one that you (and now i) use.
    "If you want to fly, give up everything that weighs you down"......

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    Re: CLoD surface wind reports

    Ahh...

    Last edited by 1lokos; Mar-02-2019 at 14:58.

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    Admin ATAG_Snapper's Avatar
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    Re: CLoD surface wind reports

    Thread stickied. Thanks for sharing this, Baffin!


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    Re: CLoD surface wind reports

    Better add this to the Bug list.. would be nice to have this standardised or is that standardized. .


    Good info..

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    Re: CLoD surface wind reports

    Quote Originally Posted by gonk View Post
    Better add this to the Bug list.. would be nice to have this standardised or is that standardized. .
    Yes, how "decipher" this runway "090" of tower call in the above picture?

    The runways there are only 0 and 360.

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    Re: CLoD surface wind reports

    I wonder how much vodka was consumed while this was being coded? It sounds like they decided to make it "winds blowing toward" rather than "from" a given direction, and speed should always be metric, regardless of whether or not the rest of the world uses it.
    Baffin, thanks so much for the explanation.

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    Re: CLoD surface wind reports

    Why "Sector controllers" wind report are in 30º segments:

    https://theairtacticalassaultgroup.c...ad.php?t=30657
    Last edited by 1lokos; May-17-2019 at 12:11.

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