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  @Korina said in A difference between reference time and update time:

  A difference between reference time and update time
  Frequently Asked Questions ARTICLE 13 26 12.9k

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  Korina
  21 Feb 2020, 18:28

  Each model has a different update time and it could be confusing what connection does it have with the update time.

  Here is the explanation:

  Reference time - is the time when a model starts a new forecast block.
  It consists of:

  Initialisation - data are entered into the model, this creates Initial conditions (initialisation time) and then model starts calculating conditions.
  Assimilation - normalisation on data and assembling data for computation.
  Computation - calculating the future atmospheric rates of change in time increments.
  Data extraction - extracting data into regular forecast intervals.
  Data storage - data are stored and written in accessible format.
  Data postprocessing - special postprocessing routines

  For example model ECMWF has an update interval 12 hours (or 6 hours interval for Premium users), that means the first reference time will be 00:00:00Z (Zulu time) and second one 12:00:00Z.

  Update time is time between the reference time and the actual update.
  The whole process of data computation takes approximately from 8 to 9 hours.
  So for ECMWF model the update times are 07:15:00Z and 19:15:00Z.
  See the exact update times here - When and how often are the weather data updated?.

  Where to find info about reference and update time:

  Thanks for the clarification! The distinction between reference time and update time makes a lot more sense now. It’s interesting to see how much processing goes into generating accurate forecasts.

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  Thanks for breaking these tools down. I wasn’t aware there were useful articles like these available in Windy. But I am aware now, of how to utilize the Fire Danger Forecast tools more clearly. Having the article link pop up was perfect, since it was the reason for using Windy tonight.

  Seems like highlighting practical tips like this for current events (no pun intended) could be a solid move for keeping users engaged. Nice work @David-Polášek

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  I'm trying the API for the first time. I have created a request that is almost identical to the one in the docs:

  {
  "lat": 49.809,
  "lon": 16.787,
  "model": "gfs",
  "parameters": ["wind", "dewpoint", "rh", "pressure"],
  "levels": ["surface"],
  "key": "Gk7LmFfd9aULH1vZd3XvwN9cvdCTBool"
  }

  When posting this to the API with curl:

  curl --data-binary @fetch.json https://api.windy.com/api/point-forecast/v2

  I'm getting "Invalid request - "key", "model", "lat", "lon" or "parameters" are missing." as the response.

  Can anyone spot the problem?