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Profile for ita10267



Name ita10267
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Posts87
  • Re: RIP psail - Joao Malafaia
    Board » General Discussion
    Still shocked by the terrible news! Had quite a few professional chat with Joao and I will remember him for is clear and concise way of thinking. Like to remember him sailing, IRL or virtually, with the same spirit!

    ciao
  • Re: RTW start
    Board » Sailonline Race Committee » Races
    will you?
  • Re: RTW start
    Board » Sailonline Race Committee » Races
    Well Done! It was the right decision to make. One of the reason SWR is the main event of SOL year is that we really get to test ourselves against the top navigators. And with 18 hours of headstart (and a totally different wx configuration) it would have been a pity to race this one on our own.

    Thanks to the SRC and management for the reaction in such a short time!
  • Re: RTW start
    Board » Sailonline Race Committee » Races
    It appears that we are starting despite the new postponement of the IRL race. I am in total disagreement with this decision as it makes incomprehensible the first postponement. Hope that the SRC can reconsider and delay the start accordingly.
  • Re: The Weather Research & Forecasting Model (WRF)
    Board » Technical Discussion
    In synoptic conditions, i.e. wind given by large pressure systems, forecast are simpler and more reliable (see the Bos-New race with the heavy storm). In fluky conditions, with basically no pressure gradient, wind is given by "local"effect such as cloud coverage etc. So yes, on mesoscale, weather is less "consistent".

    As a comparison, GFS is "averaged" over a much bigger gridsize, so all the small scale variation are zeroed and you ave a more stable but less interesting windfield. On the other hand NAM model, on a 0.1deg scale, has the same behaviour.
  • Re: The Weather Research & Forecasting Model (WRF)
    Board » Technical Discussion
    JB,
    at present time we have to allow for some WX data outside the race course (the purple line). This to allow predictor to work properly in the client. In this race we have used 0.5deg from each side. In the end we had more than 30% of datapoints "useless" for the race. In an optimal condition (no points outside race area), wxfile should have been around 4MB, which travels compressed now, so perfectly usable for the "desktop" client.
    Regarding mobile, probably it has some problems (depending on hardware) regarding memory and cache. Probably Zappe can look into that.
    Finally, the WRF is defined every hour, so dataset is 3X for the same resolution compared to GFS. As outlaw commented, we should push for even higher time resolution (1 frame every 15min). In this case probably we'll have denser frames for the first 6hrs and sparser afterwards.
    Ciao
    a.
  • Re: The Weather Research & Forecasting Model (WRF)
    Board » Technical Discussion
    forecast for sunday morning
  • Re: The Weather Research & Forecasting Model (WRF)
    Board » Technical Discussion
    A small video on high resolution weather

    http://youtu.be/n5ThrmvMJxA
  • Re: The Weather Research & Forecasting Model (WRF)
    Board » Technical Discussion
    so, you are referring to the grid discretization.
    In SOL this changes from race to race. Usually we start from 0.5x0.5 deg GRIB file from NOAA which is then interpolated to the grid of our interest. In Leg4, for the first time, we are running the ocean on a 1x1 deg grid. The "pointy" edges are caused by the interpolation algorithm (bilinear), which is the same we use to get wind in between grid points.
    The WRF model we are using in the BOS-NEW race is evaluated on a much denser grid. This is not an interpolation process but a complete physical evaluation. The 0.5degx0.5deg GRIBS from NOAA are taken as boundary and starting conditions then the calculations are done on a powerful computer. The result is a 0.05X0.05 deg GRIB.
  • Re: The Weather Research & Forecasting Model (WRF)
    Board » Technical Discussion
    We have also higher time resolution with WRF. GRIB frames are spaced 1hr instead of 3hrs. This can help with faster gradients.

    @A2: I don't really get your point regarding quadrants. Can you explain?

    --- Last Edited by ita10267 at 2015-02-10 07:41:17 ---

Races

Next Race: 00d 00h 00m


Current Races:

A to A Easter Offshore Race 2020
Welcome all to SOL's fourth race in this year's twelve race SYC Championship, and to another prestigious buddy-up with RHKYC for their A to A Easter Offshore Race 2020 which is a replacement for the deferred 2020 Rolex China Sea Race. This 400nm race will take boats from Hong Kong to Pratas Reef, Pedro Blanco before finishing back in Hong Kong waters.
Race #1332
INFOby brainaid.de
J130 Particulars
WX Updates:
0430 / 1030 / 1630 / 2230
Ranking:
SYCCH - SYCQ2 - SUPSOL - SYC
ALT. CLIENT:Classic
Race starts: Apr 10th 03:30 Registration Open!
New HTML5 Client GO TO RACE

Brisbane to Gladstone Yacht Race 2020


The Brisbane to Gladstone Yacht Race has been an annual event since 1949 and has become Australia’s #2 classic – 2020 marks its 72nd anniversary but due to COVID19 it will be a virtual classic only this year.
Race #1339
INFO by brainaid.de
Super Maxi 100 PARTICULARS
WX Updates:
0430 / 1030 / 1630 / 2230
RANKING: SYC
ALT. CLIENT: Classic
All Times in UTC
Race starts: Apr 10th 01:00 Registration Open!
New HTML5 Client GO TO RACE

Hook Island TIMED Race 2020
Welcome to Australia and the first race of Sailonline's 2020/Q2 TIMED Race Championship. We'll be racing Farr 38s some 64nm between the islands of Hook and St Bees.
RE-REGISTER HERE to race again after finishing a run.
Race #1331
INFO from brainaid.de
Farr 38 Particulars
WX Updates: 0430 / 1030 / 1630 / 2230
Ranking: TRCH – TRQ2 – SUPSOL - SYC
ALT. CLIENT:Classic
RACE CLOSE: 19 April at 2300utc
Race starts: Apr 06th 12:00 Registration Open!
New HTML5 Client GO TO RACE

Captain Bartholomew Gosnold Memorial Race 2020


Welcome to the second of three races arranged between Sailonline and SailNewport. This time we are heading out of Newport in a race around Nantucket Island in TP52s to celebrate the life of Capt. Bartholomew Gosnold who, among many other things in his short life, "named Cape Cod for the teeming fish he encountered there, and Martha’s Vineyard for his daughter."
Race #1347
INFOby brainaid.de
TP52 Particulars
WX Updates:
0245 / 0845 / 1445 / 2045
Ranking: None
ALT. CLIENT: Classic
RACE CLOSE: 9 April at 2300utc
Race starts: Apr 04th 21:00 Registration Closed
New HTML5 Client GO TO RACE

Sailonline's Race Around Vancouver Island 2020
Welcome back to Vancouver and the 525nm delightful course designed by SOLer fastpassage39. This is a tricky race, combining tight channels and open water which our seldom sailed and elegant Dufour 40 will love.
Race #1336
INFO by brainaid.de
Dufour 40 Particulars
WX Updates: 0430 / 1030 / 1630 / 2230
Ranking: SYC
ALT. CLIENT:Classic
RACE CLOSE: Sunday, 12. April at 23:00 UTC
Race starts: Apr 01st 17:00 Registration Closed
New HTML5 Client GO TO RACE

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