temperature wrong - São Paulo - Brazil



  • For days the temperature in the city of Sao Paulo, Brazil, shows a mistaken temperature as to reality. It has been doing over 35ºC in the afternoons but the Windy points 21ºC. The difference is brutal



  • Hi @mmachado , I checked the temperature range for today in São Paolo - Brazil.
    As you can see the GFS forecast model is more accurate in Brazil.
    Screenshot 2019-09-19 at 09.36.15.png


  • Sailor

    @mmachado

    In addition, your town is a big one with probably the « urban heat island » effect.
    https://en.m.wikipedia.org/wiki/Urban_heat_island
    Global models like ECMWF and GFS are not really able to take this effect into account. But this effect is generally few degree more than countryside.
    In Saõ Paulo there are 4 weather stations that you can see on Windy by selecting Reported temperature in right low corner.
    Then when you click on a station you get a comparison of reported temperature and forecasted temperature:
    37C28EAB-DF03-4A25-832B-E33E9B4D44CA.jpeg
    You see that forecasted temperatures (dashed line) matches well enough with the observed temperatures (pink curve). You can check these 4 weather stations.


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