A difference between reference time and update time

[Korina]

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:

Desktop

App

[Homer1959]

Thanks Korina, a lot easier to understand now :-)

[matijamet]

Hi, Korina!

But, then it is something wrong by NEMS! When I look on it, comparing models, I see big time difference between reference and update data!(?)

[Korina]

@matijamet
Hello, please see this post about update times - https://community.windy.com/topic/3340/when-and-how-often-are-the-weather-data-updated. There is nothing wrong with NEMS model.

[matijamet]

@Korina ,

if you look on the "reference time" for NEMS, for example hier, https://www.windy.com/multimodel/44.107/15.326?44.108,14.248,8
you'll see for METEOBLUE (NEMS) :

Updated: 2020-02-27T07:27:42000Z
Reference time: 2020-02-25

Or, I don't understand something?

Thanks!

[Gkikas LGPZ]

@matijamet
@Korina
check

[matijamet]

@Gkikas-LGPZ

Thanks! All is clear now! I supposed the forecast was fresh, the mistake was only in one place, concerning reference time...

[Korina]

@Gkikas-LGPZ @matijamet
Hello, we use Meteoblue multimodel in the compare feature, which captures the whole world. So the reference time is different for this one. For Europe we use NEMS model by Meteoblue and the reference time is not the same as for the multimodel.
It was not a bug after all.

[Gkikas LGPZ]

@Korina
One picture says more than 1000 words!

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