Post by iconPost by SnMan | 2018-11-17 | 11:44:26

Hello,

I dont understand why i have a difference of Wind prevision between Qt and Zezo.
I load this one at 20h10 and 8h10 for QT.
It's possible to have which Grif use Zezo ???

I try to compare the 2 roads prevision but with 2 Grids si different it's not possible

Thanks all et good job

Sorry for my english,;)

commenticon 5 Comments
Post by iconPost by zezo | 2018-11-17 | 12:34:13
You can check (and download) the GRIB files used at http://zezo.org/grib/gribv1/

all.grib is a bundle with the current weather forecast. There are also separate files and archives of the entire forecast.

Also in the /grib/original you can find the original GFS data (for the past 24 hours). You can also check the download schedule and progress there. Times are in UTC.

One possible source of differences is the interpolation algorithm. Data at integer coordinats should match pretty well (there is a small error introduced by the VR number representation) but the middle of the square around a front is a different case.
Post by iconPost by yaxa2vrai | 2018-11-17 | 18:31:07
I see that the files are downloaded and processed arround 3 hours after their time (ex. download of t12z files start at 15:35)

Any reason for this delay? (if my understanding is correct)
Post by iconPost by zezo | 2018-11-17 | 18:45:07
12Z is the _starting_ point of the model.

That is, at 12:something all available worldwide weather data from the 12Z point of time is loaded in the NOAA supercomputers. They start crunching the numbers and a bit later come up with the "analysis" - that's a model of the current (now slightly past) starting conditions, interpolated from the finite number of data points.

Then the computers start computing the model and about 3 hours later come up with the first "forecast" - for which is now the actual weather.

The process continues, with 3 hours worth of data becoming available every minute or two. So it takes another 2 hours to calculate all future snapshots.
Post by iconPost by yaxa2vrai | 2018-11-17 | 22:07:26
Waouh, that's long computation.

My conclusion, supercomputer they use are not enough super ;-)

Thanks for the reply.
Post by iconPost by zezo | 2018-11-17 | 22:16:11
They should only be fast enough to reliably finish the computation within the 6-hour cycle, so the resources are free for the next GRIB.

It's a medium-term forecast. There is no real benefit to get it ready in 2 hours instead of 3.
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Modification de destination
1
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Silent debugging
14
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How to manage buoys during absence
6
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Vela- route choosen by your mom
6
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VR Team ranking race criteria
1
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No news from Virtual Regatta about VOR (the ocean race).
1
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Log-in VR game marathon..
5
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VR Dashboard
5
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Dashboard - Precdicted Time ATLANTIC RECORD
1
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the prawn star
9
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polars virtual regatta
8
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how to convert Grib files to Grib2?
3
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VSR, XP points
7
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Predicted times
3
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Nord Stream *3*
11
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Game on 12Z, but Zezo still working with 06Z
3
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race wait points
1
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special boats?
7
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VR Dashboard in Firefox?
6
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ESCARGOT CLASS
11
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Los Angeles - Honolulu
26
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Rounding a Buoy
12
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VR Waypoint Heavy Bug Reporting
3
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Time of ending Jules Verne
4
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Shore detection by Zezo
2
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Nord Stream Race 2
7
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Trying to Break the VR Map Mistery !
3
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Navigating to "xxx.0" TWA
26
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Tara4 - no refresh
2
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Jules Verne: Inconsistency of headings and speeds, simulation !!
5
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VR, Zezo, Qtvlm card offsets
2
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Island's coordinates
34
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Tara Ocean 4
6
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Solo Maitre Coq
21
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Adjustable timeshift ?
3
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gate crossing question
7
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Expanded View on PC
3
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Panic at VR Nord
7
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Delays during the sail changes, or directions changes
3
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(Game wind = Zezo wind ) ⍯ (Grib winds = Windy.com)
7
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VR ending the ELO ranking.
34
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NMEA feed
128
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Dashboard Map Track Label not including the segment.tag
5
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VR ingame time
6
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VIRTUAL REGATTA and Phillip Ganier. Worst and worst every day...
7
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beta.realsail.net
2
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Escort Frigate
6
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Out of memory. If you are the developer of this content ....
17
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Question about GFS Grib
5
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RORC Caribbean 600
14
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sliding VSR
16
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Trying to use Zezo to select best combination of sails to select
7
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TARA OCEAN 3
9
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RORC Transatlantique Race
6
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Game appears stuck on 00Z weather from yesterday
4
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Sydney to Auckland
28
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Personal Message pages deleted
7
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New zezo fonction
2
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VR Ranking 2021
7
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Autosail malfunction
3
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Comments from a newbie to "long term" routing
1
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Massive thanks to Cvetan
7
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Fleet section mode record not working
2
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Possible routes on the Map tab
3
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Purple skippers on VR Dashboard
3
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UTC or CET time ?
2
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multiple routes?
2
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Real Sail
4
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Map a little gloomy
8
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Trophée Jules Verne - Route à l'envers ?
2
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Looks like weather updates offline for next 18h
26
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Bring the good old days back
7
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All.grib 0.0k ?
9
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different speed
3
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Strange 0.5 mille VR Scale
3
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Just an idea for a new feature...
7
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Connexion impossible
1
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Donations
7
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New leader - seems to be using Zezo
38
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Bravo Zezo
4
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zezo : Huge job - Huge thx
2
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Difference between boat speed display on VR, dashboard and polar curves
7
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Vendée Globe: Track lines falling too short of ischrones
8
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Tara Ocean
29
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VR winds currently not up to date ?
1
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"Sails Change" within the Programming
3
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RORC Transat finish moved to Antigua
3
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Weather update not appearing...
19
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