Propose a NEW LAYER / FEATURE You'd like on Windy


  • Sailor

    I would like to have to FREEZING ALTITUDE above SEA LEVEL. On Windy freezing altitude is proposed above the ground. This is not very useful in mountain to have a rough idea of the limit rain/snow. And if possible this freezing altitude in meters.


  • Moderator

    @idefix37
    @developers

    Till then ... (the way I use)

    Choose a location with the picker
    forecast for the location
    then "airgram".
    The white line shows the height of zero isotherm.
    I think is easy for developers to add height (in meters and FL)
    in the vertical axis of the upper (temperature) part of airgram
    the same way as they did for the lower (clouds, rain) part.
    0_1516357023285_a6f2c6c1-6fb6-4bab-b614-91a76c29ca44-εικόνα.png


  • Sailor

    @meteo-gr
    Many thank ! It’s a nice idea.
    I suppose that the way how the freezing altitude (in feet) is shown on Windy is specially for pilots.
    As aviation meteorolist, you can probably explain if it’s better for pilots to know the freezing level above the ground rather than the freezing altitude above the sea level (MSL). For planes, is the altitude or the flight level considered above the ground, and not above the sea?


  • Moderator

    @idefix37
    Usually is that above the sea level but they use (at least) 2 altitudes!
    When an aircraft is on the ground, the pilot adjust the altimeter (by inserting the pressure given by Air Traffic Control) to show the true altitude above MSL.
    After take-off, in a certain height named transition level, all pilots set in the altimeter the standard value of 1013 hPa (29.92 inches Hg) in order to standardize the indicated altitudes.


  • Moderator

    @idefix37
    Flight Levels are considered above the sea
    assuming the sea level pressure is 1013 hPa
    and are used to ensure safe vertical separation between aircrafts,
    despite natural local variations in atmospheric air pressure.

    P.S. because my poor english and for deeper knowledge
    https://en.wikipedia.org/wiki/Flight_level
    and
    https://www.thebalance.com/types-of-altitudes-in-aviation-282941


  • Sailor

    @meteo-gr
    OK so altitude is generally above MSL.
    According to your internet articles, METARs and TAFs report cloud cover in AGL (altitude above ground level), is it the same for freezing altitude?


  • Moderator

    @idefix37
    At METARs and TAFs, cloud bases AGL.
    At Low Level Significant Weather Charts (SWC),
    FRZ LVL in FLIGHT LEVELS (above mean sea level)
    (attached SWC for Italy and USA, frz lvl in red)
    0_1516375437478_fd4e456c-5ff3-4209-a39a-4d004aa934b3-εικόνα.png

    0_1516375519341_c326240d-8915-41cb-a64d-5a35c6e7b18c-εικόνα.png


  • Sailor

    @meteo-gr
    Thanks for all those informations !
    So FRZ level above ground, as shown on Windy maps, is not a need for aviation.
    I do not see the advantage of FRZ level above the ground specially because of the low ground altitude resolution in a global weather forecast mapping like Windy.
    FRZ altitude above the sea level should be more convenient.


  • Moderator

    @idefix37
    windy visualizes meteorological parameters provided by models.
    ECMWF provides the parameter "Zero degree level (DEG0) ".
    This parameter is counted from 'surface' .
    This one is available, so this one is provided.


  • Moderator

    This post is deleted!

  • Sailor

    @meteo-gr
    OK I understand. But in this case, it should be better to call it Freezing Height or Freezing Level rather than Freezing Altitude. Don’t you think so?



  • Hi. Im a glider pilot. And we travel for long distances.
    Love the graphics in the app
    A thernal forecast would be nice. Like RSPA.
    And a wave forecast for wave flying.



  • Hi Guys. Stellar app!
    Three elements are essential to planning my missions are: Wind, waves and tide.
    The first two Windy provides without peer.
    The last has to be sought elsewhere.
    Any chance of building in some tide charts?


  • Meteorologist

    I took a look through the available ECMWF NWP datasets and one field caught my attention......"simulated satellite data "CLBT".
    I have seen this field displayed before and it looks pretty cool, an IR or Water vapour satellite picture simulated through NWP cloud output.

    see example:
    alt text

    *Simulated infra-red and water vapour images for geostationary satellites Simulated satellite images are generated from the model forecast fields using the same radiative transfer algorithm (RTTOV) as in the ECMWF operational data assimilation. The forecast brightness temperature can then be used to produce pictures equivalent to the infra-red and water vapour images available from geostationary satellites. The model-simulated satellite images are now produced for leads up to five days.

    These products display cloud-related fields from the model in a format that is very familiar to forecasters, that they are used to interpreting, and that can easily be compared to actual satellite imagery. The user may find that interpretation can be aided by using browser tabs to toggle between the WV and IR products.

    IR (infra-red channel) The simulated infra-red images are overlaid with the forecast 850 hPa wet-bulb potential temperature field, commonly used to identify fronts. This helps the forecaster to distinguish, for example, frontal cloud from cloud arising from convective activity (for the user, the spatial variability of precipitation is very different in these two situations). Other cloud types will also be recognisable.

    WV (water vapour channel) The simulated WV images generally focus on the upper troposphere, and have been overlaid with mean sea level pressure to highlight connections with the surface. The dynamical forcing mechanisms responsible for cyclogenesis can often be apparent on these plots. Convective development related to potential instability - where dry air overruns a front for example - can also show up.*

    This would be my request!!! Thx.



  • Tide chart and water temp.

    Living on the Outer Banks requires a keen interest in the weather. Where I live I get flooded many times per year so I'm always flipping through many weather apps to get all the information needed to get the complete picture. This app is fairy new to me and I love it so far, but coastal communities really need tide and water temp data to be fully informed.

    I set up an alert for the particular wind direction and strength that affects me, but being able to add a tide state would make it much more accurate. Water temp is less important, but is yet another stat I need another app for. Not sure if tide information would work as a layer, but being able to look it up in the app would be awesome.

    Lastly, in the android app I'd love to see a true graph style weather outlook widget. I do like the detailed 4x2 widget, but I just can't read the tiny numbers when it doesn't contrast with the background colors. A graph is just so much easier to digest quickly. I still keep my weatherunderground 2x2 widget (with chart) on my home screen for quick weather glances, I just wish it had an added wind graph line for strength and arrows at the bottom like your widget, and it would be almost perfect. So for now I keep your widget, the Wunderground widget, and the androtide widget to get my complete picture at a glance. For further detailed information I open your app. It's not even close.

    Thanks for the great app and site!


  • Moderator


  • Meteorologist

    @malecky ....this is a useful suggestion. Would provide a means of verifying the NWP output through overlaying NWP cloud/wind/RH fields over satellite imagery at coincidence time steps. NICE!


  • Moderator

    I come back with my proposal to include "model's orography"
    as I explained here
    https://community.windy.com/topic/4657/reference-altitude
    and here
    https://community.windy.com/topic/4513/what-elevation-for-spot-forecasts

    As I know it is included in ECMWF's dataset 1, available to you.
    Name:orography
    Symbol: Z
    ΙD: 129



  • @meteo-gr

    Thanks for the info! Still learning the app and completely missed the sea temp, which makes me wonder if I'm missing something with the "wind, waves, swell" map you posted. I see it gives current conditions of wave height (and future predictions), but is there any place it shows actual tide times?

    Thanks!


  • Moderator

    @akovia said in Propose a NEW LAYER / FEATURE You'd like on Windy:

    @meteo-gr

    ... but is there any place it shows actual tide times?

    Thanks!

    see https://community.windy.com/topic/5339/low-high-tide


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