Analysis charts

Damir120505

@korina, with premium I can see +001, +002, +003, +004... and +000 hours forecasts?

Korina

@damir120505 Forecast is also available for 0 am -
Screenshot 2021-01-28 at 13.49.00.png

Damir120505

@korina, no. I didn't mean 00 am. The model is updated every 3 or 6 hours. After the update, the first available forecast is +003 hours (+001), but Windy does not have a +000 forecast (analysis).

Korina

@damir120505 The ECMWF model is updated every 12 hours (every 6 hours with Windy Premium). Each model has a different update times.

idefix37

@damir120505
Please show a screenshot ! You are not clear.
Are you talking about time shown in the time line or in Meteogram?

Damir120505

@idefix37, I'll show example on GFS. Last update - 00 UTC. First available forecast is for 01 UTC (+001). But I need chart for 00 UTC hour (+000 or Analysis).

Gkikas LGPZ

@idefix37
I think damir talks about initial data for every run of the model.

Korina

@damir120505 The forecast data are valid until the next update time (or ref time). This is just how the GFS or other models work.

Damir120505

@korina, any model have analysis map. If model updated in 00 UTC it has forecast for +001 and analysis. But analysis ISN'T forecast of previous model run. For example, init time and valid time are same on this picture. Unfortunately, Windy has no analysis map.

Korina

@damir120505 You can learn more about reference and update time here -

https://community.windy.com/topic/11361/a-difference-between-reference-time-and-update-time

Damir120505

@korina, I knew the information from the topic before.
Indeed, before starting to calculate weather forecasts for the future, the model analyzes the weather at 00 and 12 UTC and receives a "map" for this time. This time is called analysis or +000 hours. But the first available term in Windy is an hour or 3 after the analysis (+001 or +003 hour).

idefix37

@damir120505
For ECMWF Analysis is not disseminated together with Forecasts.
https://www.ecmwf.int/en/forecasts/documentation-and-support/data-delivery/dissemination-schedule

May be Windy chose not to acquire the Analysis but only the Forecasts.

Same for GFS
https://www.nco.ncep.noaa.gov/pmb/nwprod/prodstat/

Yves70

Yes, @idefix37 is right, there is a delay between analysis and forecast, as described in the link proposed by @idefix37. This should be the case for other models.
Price to acquire data and analysis can explain that people go for the forecast