open-meteo
Windspeed greater than Windgust
i notice a strange behaviour since a moment now.
theoretically the "Windgust" (17knots) is always greater than the "wind speed"(12 knots). Sometimes the NOAA model display a windspeed greater than the windgust, it's a non-sense.
You can see this behavior here for example. https://open-meteo.com/en/docs/gfs-api#latitude=37.7749&longitude=-122.4194&hourly=windspeed_10m,windgusts_10m&timezone=America%2FLos_Angeles&forecast_days=16
Do you spot the problem ? Thanks !
I have found this problem recently too. It seems like at some point, one of the variables slips over time, so the values are probably correct, but they don't belong to that time:
https://open-meteo.com/en/docs/gfs-api#latitude=40.73574058846105&longitude=0.8549907355115893&hourly=wind_speed_10m,wind_gusts_10m&wind_speed_unit=kn&timezone=auto&forecast_days=16&start_date=2024-02-20&end_date=2024-02-20&time_mode=time_interval
But I am not sure if this is related to Open Meteo only, as I have found that it is also happening sometimes at Windguru. But the most strange thing is that is not happening at the same dates.
My app at the same spot with Open-meteo data:
Windguru (26 feb seems correct, there is only one issue on 29th):
Windguru Maui data (lots of issues, but it's only 1 or 2 knots difference):
May it be related to the introduction of the 15min forecast data?
Hi, sorry for the late reply. I could have sworn I answered this ticket already...
... GFS can show wind speeds higher than gusts. It might be either a time instant vs preceding hour issue or the numerical equations simply allow for wind speeds higher than gusts. The same issue can be observed in windy and other apps https://www.reddit.com/r/meteorology/comments/187pzzx/why_does_gfs_have_gusts_lower_than_average_wind/ https://community.windy.com/topic/9480/incorrect-wind-speed As Open-Meteo tries to "preserve" the original weather data as much as possible, I do not want to artificially limit gusts and wind speeds.
https://github.com/open-meteo/open-meteo/issues/566#issuecomment-1872245098
In addition to that wind speeds at 10 metre use the 13 km GFS model while gusts use GFS 0.25°.
