
Post by
zezo | 2020-11-12 | 09:31:52
Hmm the current grib is 00z now (available from 5 UTC/7CET)
The GRIB name comes from the initial conditions.
18Z is based on data from 18h UTC, model based on it is available about 5 hours later, so should be in use between 23 and 05 UTC
Right now 06Z will start trickling in.
About the difference - are you sure the dashboard data timestamp is current? Look at the first column. Current protocol does not update without user interaction and there may still be glitches with the extension.
It's not impossible to see such big differences, but is uncommon. Happens mostly when you are close to a ridge/center of a weather system where the conditions change sharply with time and position.
The workaround is to steer the boat by the server data. Like keep auto TWA on to avoid heading into wind and unnecessary sail changes. When deciding when to gybe disregard the interface boat direction - look at the real numbers. It was easier with the original auto updates, now it takes more effort.