Addition of Fronts





  • I agree with idefix: temperature layer at 850hPa is useful. Looking at winds also helps: wind abruptly changes direction by maybe 45 degrees at the front. Over ocean, surface winds are fine, but over land I'd look at winds at 850-900hPA as well. It also helps to look at precipitation: it rains there. It also helps to see the pressure contours: they have a little kink at the frontal lines. My favorite view at windy.com for that is: color as precipitation, pressure contours, and particle wind animation.

    There are some related discussion here https://www.morganscloud.com/2017/06/28/grib-weather-files-you-gotta-see-the-rain/



  • @idefix37 - awesome, thank you so much. I'm much smarter now reading your answer. I will watch 850hPa. 👍🏼



  • In aviation, before flight, the pilots use fronts and tipically stationnery fronts to avoid storms.
    In fact, fronts are very inportants for aviation security.
    An other way to improve security is to produce storms animations using lightnings data: the pilot can forecast where storms move and which altitude is the best for the trip he wants to achieve.


  • Sailor

    @Jacquiel

    ....pilots use fronts ..... fronts are very importants.... and so ?
    Do you know a way to get numerical data of weather fronts, if possible covering the whole globe and being free ? Or do you suggest Windy should employ meteorologists to draw fronts?
    I usually look at fronts charts issued by official weather services.... but I understand that an app based on numerical weather models visualisation cannot display weather fronts. Apparently not you.

    Concerning lightnings they are available together with Radar layer. Do you want something more?

    In addition I would like to add a comment of a professional pilot @Gabou971
    https://community.windy.com/topic/7583/suggestion-from-professional-pilot/2



  • Although I don’t disagree with you, what would help immensely for pilots is for pressure change to be displayed with altitude change, using the same altitude slider tool and increments as the temperature and wind altitudes use. The pressure data with altitude change clearly exists in the model Windy has access too, as other features in windy use it already. So add an altitude slider to the pressure overlay interface. That would allow pilots to see the upper lifting structures, and their relative movement with time, more clearly than a moving line over a model ever would. The data and tools needed to implement it already exist.

    The implementation issue I foresee is the need to extend the pressure overlay's range to cover the much lower pressure (150 hPa at FL450 for instance). I extended the pressure overlay down to 870 hPa. It would be easy to extend it to 700 hPa. Or even down to 500 hPa to cover the entire VFR range. It’s just a matter of tweaking the increments and color shading (I increased the temperature overlay's lowest T range already to deal with the entire globe’s temperature distribution above FL340). And IFR pilots will generally have flight service and institutional tools or avionics integration available to address WX issues at IFR altitudes. So there’s no particular need to display below about 500hPA (+/-100 hPa).

    Regarding your link that pilot's advice is quite correct. However, an increase in short-term pressure situational awareness for a GA pilot just prior to taking a flight is a very good thing to have easy access to and Windy does have a potential to provide easily accessible rapid-assimilation of pressure changes they're likely to encounter at VFR altitudes. If the overlay emphasizes fine-details throughout its range they would easily see where the 'front' or trough is located, and moving to. No one would actually need a line drawn to see where it is and where it fades to ambient, as a detailed display would implicitly mark where such features are forecast to be with time.

    PIREPS can 'ground-truth' the forecasting, but a general situational awareness boost reduces practical mental workload and stress which provides the mental-space to perform all other flight tasks better. Pressure changes can surprise you, and they want a tool that leaves less likelihood of surprises. Yes, a pressure model can be wrong, but a line on an air services forecast plot can be too, hence PIREPS.

    Windy can easily provide that awareness without manually drawing a line anywhere as the model’s ‘pseudo-data’ will depict which way the pressure change structure lays and is likely to move.

    That would be extremely useful to many non pilots as well.



  • @idefix37 You look like a smart guy when it comes to weather apps, but you´d get more attention if you refrained from using a somewhat mockery tone when replying to other users´notes . Jacquiel comment was very pertinent for GA pilots (like me), and although it is understood that one should NOT use Windy for flight planning, his question was perfectly legitimate. Thank you for enlightening us all with your weather app wisdom and forgive who has another set of skills.


  • Moderator

    Windy will not draw fronts in the maps because this is a manual process which a meteorologist have to do.



  • @Tomber42
    Another site has this. It is potentially in digital form (after someone has drawn it) and can thus be obtained. Perhaps some data trading is in order?


  • Moderator

    @AlanTheBeast said in Addition of Fronts:

    @Tomber42
    Another site has this. It is potentially in digital form (after someone has drawn it) and can thus be obtained. Perhaps some data trading is in order?

    Windy uses free open data only (except ECMWF and SAT Imaging)..


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