Post by iconPost by RodH | 2010-01-06 | 00:11:09

I note that I get distinctly different course predictions when I look ahead One Day vs. 2, 3, 5, or 7Days. I realize that each prediction takes into account the different wind predictions of each day, the further ahead that I look.
My question to Zezo and the users is, how much reliance should I place on the predictions that extend further into the future? I guess what I am really asking is the reliability of the UGRIB weather predictions at each day into the future? Does anyone have any historical information about the UGRIB reliability? Is there any statistical information available on this subject?

commenticon 1 Comment
Post by iconPost by zezo | 2010-01-06 | 16:52:58
The forecast is quite reliable in stable weather conditions with strong winds and well developed systems. I've seen 7-day forecasts come very close in the North Atlantic.

But that's not the case around the Equator where the Clipper race is now. Here everything over a day or two is more like a gamble, and in areas with very weak winds like 1-2 kt even the 12h forecast is not reliable.
border
Topics list
Posts
border
VG2024 Zone Exclusion Açores
1
border
border
Penalités
5
border
border
Zone d'exclusion Rio de Janeiro
3
border
border
Game web Access
2
border
border
Jules Verne
1
border
border
Vendée Globe 2024
68
border
border
HAPPY NEW YEAR
2
border
border
Globe 40 Leg #4 Sidney - Valparaiso
2
border
border
Christmas Race 3
5
border
border
Lissage
3
border
border
impossible to start theJules Verne record race
4
border
border
Ganhe R$100 instantâneos ao se cadastrar na
1
border
border
Receba R$100 ao criar sua conta na
1
border
border
Receba R$100 ao criar sua conta na
1
border
border
Aproveite o bônus de R$100 na
1
border
border
Aproveite o bônus de R$100 na
1
border
border
Polars
9
border
border
Modification of the ZEA ... again !
14
border
border
Difference of boat speed between real boats and VR boats
4
border
border
chrome extension
7
border
border
Penalties
4
border
border
Afficher 2 routages en simultané
6
border
border
Stamina items
2
border
border
closing time of a race
1
border
border
Avoid change of sails (SPI) going from LG to HG (through SPI)
14
border
border
Grib Files update and routing
7
border
border
What are the little red and blue dots?
8
border
border
Ligne rouge sur parallele 43°50 sud
2
border
border
Suivi des joueurs
1
border
border
Probleme d'affichage
5
border
border
Import Zezo grib in QTVLM
5
border
border
Zezo grib repository
4
border
border
When routing with Zezo, what do the little green/red squares on the TWA/HDG route represent?
3
border
border
Pénalité lors de manoeuvre sans changement de voile
7
border
border
ranking in jules verne race
1
border
border
Modification of the ZEA
6
border
border
restarting a race
4
border
border
How are VR files .wnd structured ?
10
border
border
affichage coordonnées
2
border
border
Actualisation météo ce midi 28 novembre sur le VG
3
border
border
Weather update
19
border
border
RECORD La Mauricienne
10
border
border
Jules Verne 2024
5
border
border
Vendée Globe
6
border
border
Quel "Go to" suivre
2
border
border
VG 2024 et option timeshift
2
border
border
Routage IA
4
border
border
Foils dans le Dashboard
2
border
border
Messagerie avec autres bateaux du VG sur VR
3
border
border
Zezo sous Firefox
2
border
border
How to set destination on a chart on an iPad
3
border
border
zezo pour Ipad
11
border
border
Chemin inverse sur le Vendée Globe
3
border
border
Routage vendée globe limité ??
2
border
border
route zezo.org / extraction des coordonnées GPX pour import Windy
11
border
border
Free Races option gone??
2
border
border
routage
5
border
border
route-zezo extension not available anymore in the chrome store
5
border
border
Old extension does not work anymore
2
border
border
no more access Dashboard VR
12
border
border
Stamina Boosting Items
17
border
border
When to do the routing ?
3
border
border
How do you keep up?
3
border
border
Missing "+" but updates
5
border
border
Weather update
2
border
border
ITYC / waypoints problem
1
border
border
VR Dashboard EOL
11
border
border
Ocean fifty #5
3
border
border
java script console did not load properly
2
border
border
Finistère Atlantique
2
border
border
Maupiti - Papeete
4
border
border
Normandy Channel Race
1
border
border
Figaro 3 et mise en place des courants marins...
1
border
border
honolulu yokohama
5
border
border
Routing : Honolulu / Yokohama
2
border
border
Singapour Express
1
border
border
Hong Kong to London
1
border
border
Route for Baltic
1
border
border
Can't access VR
1
border
border
ATLANTIC RECORD
1
border
border
Homepage dropdownlist
1
border
border
Tour Voile #3 ?
1
border
border
Indian Ocean Cup
4
border
border
La trinite routing through exclusion zone
1
border
border
Quebec St-malo
2
border
border
1
border
border
Click and Boat #4 : timeshift not working
1
border
border
NEW YORK/SAN FRANCISCO
2
border
border
Ocean Fifty series - Act 2
5
border
border
New-York / San Francisco
8
border
border
Los Angeles - Honolulu predicted times ?
2
border
border
Transat NY VENDEE
1
border
border
"Start times" drop-down menu in fleet races?
8
border
border
RECORD : LONDON- HONG KONG
3
border
border
Pantaenius Rund Skagen
3
border
border
Transat CIC : routing through exclusion zone
1
border
border
IMOCA Transat CIC (Exclusion Zones question)
6
border
border
Transat CIC Races
3
border
border
Is Cvetan ok?
13
border
border
Los Angeles - Honolulu
6
border
border
Password
3
border
border
REVERSE ODYSSEY
18
border
border
ARKEA Ultim Challenge
28
border
border
Saint Patrick's Race
3
border
border
Round Australia Record
5
border
border
Columbus2
3
border
border
Jules Verne Trophy
12
border
border
Breizh Tour
2
border
border
ARKEA Ultim : no more zezo routing available
2
border
border
ARKEA Ultim : zezo routing through exclusion zone
1
border
border
Round Australia Record en Zezo
1
border
border
JVT : no route computed beyond 60° S ?
7
border
border
My yacht sales slower than the oponents
3
border
border
Races on homepage
5
border
border
Any news about GFS 0.25ª ?
47
border
border
VR & qtVlm
6
border
border
daylight saving time
2
border
border
How to use two operating systems in one laptop?
1
border
border
Synchronisation of weather with VR
3
border
border
The text regularly disappears on certain VR pages
2
border
border
Dashboard local time KO on Chiloe
2
border
border
GFS Resolution
5
border
border
Boat position on dashboards map not working well
7
border
border
WES6
4
border
border
WES #8
1
border
border
Departure time for "Retour a la base"
1
border
border
TWA signed
1
border
border
Am 24. November 2023 startet zum ersten Mal die Deutsche Meisterschaft im Offshore eSailing
3
border
border
WES #5
3
border
border
Please Respond
2
border
border
Dashboard KO
32
border
border
Polars Ultim
4
border
border
TJV Races : november 6 start
1
border
border
Race list update ?
2
border
border
Trophy Jules Verne : Gribs
3
border
border
Absence of Waypoint on both Dashasboards
4
border
border
Cafe 93 Center of display?
2
border
border
TJV Ultim : Timeshift KO
5
border
border
O50 and C40 first legs
1
border
border
Mini transat start on saturday
2
border
border
Mini transat start on saturday
1
border
border
Mini Transat Leg 2
2
border
border
WES #2
2
border
border
WES
5
border
border
Arrivée Vendée globe
1
border
border
Sydney-Auckland
3
border
border
Mini-Transat start postponed - timeshift is wrong
5
border
border
Minitransat not available ?
1
border
border
DEFI AZIMUT
4
border
border
Pro Sailing GFS 0.25
10
border
border
Figaro leg 2
3
border
border
Winds speed : map display bug ?
8
border
border
Cutoff date for the NY - SF record attempt?
6
border
border
Not red nor green projection lines.
3
border
border
Dashboard: maps out of service
3
border
border
The Options information on the Dash
6
border
border
New polars
7
border
border
User Interface re-organization bug + add info
9
border
border
Sailonline
2
border
border
RECORD : New York / San Francisco
2
border
border
The Ocean Race Leg 7
1
border
border
CIC Normandy
5
border
border
toxcct
3
border
border
Several...
4
border
border
Heading true wind curve indicators
6
border
border
California race leg 3
3
border
border
California race leg 2
2
border
border
the PAPREC 600
2
border
border
Pro Sailing Tour 3/3
4
border
border
Ocean Race Leg 4 - 5
1
border
border
Wind differences between zezo and VR
10
border
border
Pro Sailing Tour 2
1
border
border
ArMen Race
3
border
border
Defi Atlantique 2/2
4
border
border
problem N S and W E buttons not working on android
8
border
border
python3 code for nmea_proxy.py
3
border
border
CCEDHEC.
3
border
border
RECORD Los Angeles-Honolulu
3
border
border
Chrome extension ZEZO
2
border
border
Solo Maître CoQ. Winds GFS 0.25 ?
3
border
border
Mod 70
1
border
border
IMOCA #3 - Unsupported race, no router support yet.
3
border
border
Some problems with Predicted times Sydney Tahiti for GFS 27.2 18Z to GFS 28.2 06Z ?
3
border
border
Antarctic Ice Exclusion Zone - Leg 3
10
border
border
SYDNEY/PAPEETE
1
border
border
Chromebook
3
border
border
RealSail - new platform
55
border
border
Routage - Ice Exclusion Zone
2
border
border
Shortcuts across land on Dashboard
3
border
border
arrival time
4
border
border
Changed start Globe 8. (Another time...)
1
border
border
Jules Verne, is there no problem with the card until the finish?
6
border
border
Routing RECORD Sydney - Papeete
7
border
border
New races charts ?
9
border
border
No route with GFS06Z
10
border
border
polars for windpredict.com
2
border
border
Changed start Globe 7
9
border
border
Imoca 1 or 2
2
border
border
Anyone else experiencing terrible lag in the game?
3
border
border
VIP-Membership
3
border
border
Heading list
3
border
border
two times the same race
3
border
border
routing differences bitSailor / zezo / offline
4
border
border
Ushaia-Recife
1
border
border
Routing JV is off
7
border
border
Is this site active?
8
border
border
Impossible to enter VR from this morning, ~ 9 AM CET
2
border
border
Wind updates on VR Leg 0 ?
2
border
border
The Ocean Race is back. So I am.
1
border
border
Sydney to Hobart
4
border
border
Private Race - qualification Du Virtuel au Reel
4
border
border
Polars available
15
border
border
Ocean Masters Series
3
border
border
Current wind difference
2
border
border
Back to St Malo
1
border
border
globe40-5
2
border
border
calculation of time dots
1
border
border
THANK YOU !
15
border
border
Weather Updates
2
border
border
Zezo on webrowser Chrome on a pc versus a tablet
2
border
border
Why does VR constantly nag us?
2
border
border
predicted time
19
border
border
Unable to log in
8
border
border
VOILES
2
border
border
Polars ULTIM & IMOCA
2
border
border
Route du Rhum
7
border
border
TROPHÉE JULES VERNE : routing ZEZO
3
border
border
Route du Rhum race start postponed
9
border
border
iPad usage
4
border
border
simulating alternative routes
1
border
border
newzealande
3
border
border
Halloween
3
border
border
Troussel cup
1
border
border
La Mauricienne
6
border
border
Vendée Globe Cap-Town / Cap Horn
2
border
border
concern about Grib file actualisation
1
border
border
Defi Azimut
2
border
border
Energy gauge numbers?
7
border
border
New York - San Francisco
3
border
border
Carte VR avec Pixels (french version)
2
border
border
Carte VR avec Pixels (french version)
1
border
border
VR Map with Pixels
1
border
border
Polar Imports?
6
border
border
Filters on Dashboard
2
border
border
weather updates on FIGARO
6
border
border
Major VR update
4
border
border
Grib HAVANA
1
border
border
Sevenstar race
2
border
border
Globe 2 Destination on Zezo
2
border
border
Server Migration VR
9
border
border
ALERT - Zezo stopped on GFS:t06z but VR loads the 12Z before Migration
2
border
border
maps .cht for VRTool
70
border
border
zezo trigger problem
3
border
border
how to manage the energy on VR?
14
border
border
mission exmuth
3
border
border
Catalina sur Mac
2
border
border
Stamina
13
border
border
Record : New York / San Francisco
7
border
border
ZEZO no longer triggers on all my races
4
border
border
Comparison between Avalon and Zezo
3
border
border
vendée article
12
border
border
dashboard with stamina?
7
border
border
Factor
2
border
border
Forum en français
13
border
border
Pantaenius Rund Skagen
4
border
border
sydney Tahiti
12
border
border
Come back from Crete by the North shore
5
border
border
Toxcct - NCR: wrong polars?
7
border
border
Is there a software to analyse the polars of a boat?
7
border
border
Bermudes 1000
5
border
border
Problems on display the Zezo router. Since yesteday night
3
border
border
Record : HONOLULU → YOKOHAMA
5
border
border
Mayflower
5
border
border
LA HONOLULU
29
border
border
nooa
5
border
border
VR weather format
8
border
border
1000 Mile Race
1
border
border
Zezo support on Ocean 2022 #1
3
border
border
Buoys turn
6
border
border
VR Dashboard
45
border
border
List of past races
3
border
border
St. Patrick's race category
5
border
border
Bombay Start Time
2
border
border
Anyone using the VR in-game router? Is it any good? Other routing software?
5
border
border
Apply Zezo routing into VR
5
border
border
How to search subjects in the forum
3
border
border
Ultim Crew
3
border
border
Zezo et options problèmes de routage
2
border
border
Origin of the name ZEZO
4
border
border
Running aground
9
border
border
pb zezo block to pass 60W in tara race
6
border
border
Dubai to Muscat
15
border
border
Decoding all.ggrib
3
border
border
Chrome extension no longer works after update to Chrome 97.0.4692.99
7
border
border
Zezo wind hour issues on race USE IT AGAIN
1
border
border
Routing during transition fm one grib to another
3
border
border
Search in forum topics & use of iPad
7
border
border
Transquadra Race #2 : Code 6
2
border
border
PB to Connect VRDASHBOARD to VR
41
border
border
No access to certain races on "http://toxcct.free.fr/polars/
4
border
border
Hours in zezo
3
border
border
ZEZO use in VIRTUAL REGATTA
11
border
border
Search topic on the zezo forum ?
10
border
border
Comment passer la date de routage dans l'url de zezo?
3
border
border
King George to San Gregorio
2
border
border
Grib update ?
10
border
border
allgrib
8
border
border
Jules Verne Trophy next leg issue
2
border
border
Globe 40
7
border
border
VSR 2021
11
border
border
Sydney to Hobart
11
border
border
NMEA Output - UDP
1
border
border
Use it Again - Polars
17
border
border
start time preset timed races
3
border
border
Maneuvering Bug?
4
border
border
Mnea proxy link to Squid X in MAC
3
border
border
Show different routes
2
border
border
Manoeuvering penalties update
44
border
border
Nooa
5
border
border
Route du Rhum
7
border
border
What means "FACTOR"
9
border
border
Add TWD in Fleet Sheet of the Dashboard?
6
border
border
Classement en ULTIM + FOILS uniquement
2
border
border
Hull Polish
4
border
border
TJV Martinique island arrival routes
1
border
border
How to get boat names from VRDashboard NMEA data?
5
border
border
VR and Map for aground
1
border
border
See when friends are registered for a race
4
border
border
VR charges too much credits?
9
border
border
Trophée Jules Verne
102
border
border
lost the red informations on the routeur
4
border
border
Dashboard
5
border
border
Transat Jacques Vabre Virtual Regatta
15
border
border
JV2021 Predicted Time
3
border
border
any zezo connection
5
border
border
FUNBRIDGE. Code for all sails, no foils etc.
8
border
border
Anyone else affected in TJV Imoca, (or any other race)? Stuck north of Kerlouan
5
border
border
TJV Imoca
1
border
border
Echange code full pack Transat JV Imoca contre code full pack autre course
2
border
border
JV ULTIM
3
border
border
Time error in the zezo timetable - Vendee
2
border
border
calculation of the credit received on a race
9
border
border
Vendee Globe
15
border
border
Router shows direct upwind sailing angle in Marseille-Carthage race
2
border
border
Non Existent(secret Races)
9
border
border
the standstill boat
1
border
border
A standstill boat
1
border
border
Feature request - port/stbd tickbox
1
border
border
Marseille-Carthage record
8
border
border
Penalties on the Multi50
3
border
border
VR not reachable
13
border
border
time shift
4
border
border
Imoca (foils)
3
border
border
VR sold to a bigger company, online bridge leader
4
border
border
NOAA GFS Release Times
2
border
border
Discovered on the dashboard?
3
border
border
Destination for minitransat
7
border
border
Steering The Course not supported :(
2
border
border
Boat position extraction from VR
6
border
border
businessmenulist
1
border
border
VC in yellow
6
border
border
Globe 40 Series
3
border
border
classement general for globe40 ...and figaro?
6
border
border
Globe 40 step3
3
border
border
503 Service Not Available
3
border
border
buoy on Globe40 #03
9
border
border
round britain
8
border
border
Everything stopped !!!! at 9:25 p.m.
5
border
border
Figaro2_Start
4
border
border
MANEUVERS (TRANSFER, GAY ...) & TIME OF SPEED REDUCTION ON VIRTUAL REGATTA
2
border
border
Mise à jour??
2
border
border
Proposals for New FAQ
43
border
border
Solitaire du Figaro : bouées ignorées / buoys ignored
3
border
border
The Charts calculations: Who is using them and how much?
4
border
border
Polar boat "Offshore racer"
17
border
border
Solitaire du Figaro : First buoy moved to Rochebonne
4
border
border
Track lines in VR Dashboard
3
border
border
Pénalité de manoeuvre
4
border
border
New rules, new game?
4
border
border
New email address and password for my old account?
3
border
border
Globe40 bug?
13
border
border
Fastnet 2021
18
border
border
What happend to Toppen!
5
border
border
Better mobile support and maybe better user experience?
3
border
border
Request for explanation: Zezo updates (deadlines)
3
border
border
Updating boat position on zezo
2
border
border
Buoys in the record race
6
border
border
Summer Cup
13
border
border
new VR penalties
8
border
border
VR Dashboard 3.16
10
border
border
Estimated Record Time on a record race
8
border
border
no updates since yesterday !!
3
border
border
Predicted times color background
3
border
border
polar NY - SF
2
border
border
Can you go around ground based on the ghost boat ?
9
border
border
[Globe 40 (477)] TWA curve differs from navigation dots by about 5°
2
border
border
Global 40 - new Class 40 polars
16
border
border
Globe 40 on credits
4
border
border
olympic race - which route to choose?
52
border
border
Atlantic record bugg zezo Goto Lizard
3
border
border
Figaro 3 Polars Winches
24
border
border
Bit Sailor Router in RealSail
2
border
border
Modification de destination
1
border
border
Silent debugging
14
border
border
How to manage buoys during absence
6
border
border
Vela- route choosen by your mom
6
border
border
VR Team ranking race criteria
1
border
border
No news from Virtual Regatta about VOR (the ocean race).
1
border
border
Log-in VR game marathon..
5
border
border
VR Dashboard
5
border
border
Dashboard - Precdicted Time ATLANTIC RECORD
1
border
border
the prawn star
9
border
border
polars virtual regatta
8
border
border
how to convert Grib files to Grib2?
3
border
border
VSR, XP points
7
border
border
Predicted times
3
border
border
Nord Stream *3*
11
border
border
Game on 12Z, but Zezo still working with 06Z
3
border
border
race wait points
1
border
border
special boats?
7
border
border
VR Dashboard in Firefox?
6
border
border
ESCARGOT CLASS
11
border
border
Los Angeles - Honolulu
26
border
border
Rounding a Buoy
12
border
border
VR Waypoint Heavy Bug Reporting
3
border
border
Time of ending Jules Verne
4
border
border
Shore detection by Zezo
2
border
border
Nord Stream Race 2
7
border
border
Trying to Break the VR Map Mistery !
3
border
border
Navigating to "xxx.0" TWA
26
border
border
Tara4 - no refresh
2
border
border
Jules Verne: Inconsistency of headings and speeds, simulation !!
5
border
border
VR, Zezo, Qtvlm card offsets
2
border
border
Island's coordinates
34
border
border
Tara Ocean 4
6
border
border
Solo Maitre Coq
21
border
border
Adjustable timeshift ?
3
border
border
gate crossing question
7
border
border
Expanded View on PC
3
border
border
Panic at VR Nord
7
border
border
Delays during the sail changes, or directions changes
3
border
border
(Game wind = Zezo wind ) ⍯ (Grib winds = Windy.com)
7
border
border
VR ending the ELO ranking.
34
border
border
NMEA feed
128
border
border
Dashboard Map Track Label not including the segment.tag
5
border
border
VR ingame time
6
border
border
VIRTUAL REGATTA and Phillip Ganier. Worst and worst every day...
7
border
border
beta.realsail.net
2
border
border
Escort Frigate
6
border
border
Out of memory. If you are the developer of this content ....
17
border
border
Question about GFS Grib
5
border
border
RORC Caribbean 600
14
border
border
sliding VSR
16
border
border
Trying to use Zezo to select best combination of sails to select
7
border
border
TARA OCEAN 3
9
border
border
RORC Transatlantique Race
6
border
border
Game appears stuck on 00Z weather from yesterday
4
border
border
Sydney to Auckland
28
border
border
Personal Message pages deleted
7
border
border
New zezo fonction
2
border
border
VR Ranking 2021
7
border
border
Autosail malfunction
3
border
border
Comments from a newbie to "long term" routing
1
border
border
Massive thanks to Cvetan
7
border
border
Fleet section mode record not working
2
border
border
Possible routes on the Map tab
3
border
border
Purple skippers on VR Dashboard
3
border
border
UTC or CET time ?
2
border
border
multiple routes?
2
border
border
Real Sail
4
border
border
Map a little gloomy
8
border
border
Trophée Jules Verne - Route à l'envers ?
2
border
border
Looks like weather updates offline for next 18h
26
border
border
Bring the good old days back
7
border
border
All.grib 0.0k ?
9
border
border
different speed
3
border
border
Strange 0.5 mille VR Scale
3
border
border
Just an idea for a new feature...
7
border
border
Connexion impossible
1
border
border
Donations
7
border
border
New leader - seems to be using Zezo
38
border
border
Bravo Zezo
4
border
border
zezo : Huge job - Huge thx
2
border
border
Difference between boat speed display on VR, dashboard and polar curves
7
border
border
Vendée Globe: Track lines falling too short of ischrones
8
border
border
Tara Ocean
29
border
border
VR winds currently not up to date ?
1
border
border
"Sails Change" within the Programming
3
border
border
RORC Transat finish moved to Antigua
3
border
border
Weather update not appearing...
19
border
border
Dashboard not updating.
6
border
border
Boats Skins Vendée Globe
3
border
border
Safari on iOS: Bearing lines gone
3
border
border
Wrong coordinates in zezo
2
border
border
Winds in the chart do not show changes between 78 hours and 114 hours forecast
2
border
border
Decoding of All grib
6
border
border
I CANNOT ENTER FOR 3 HOURS IN THE GAME
23
border
border
Why the vc data is yellow underlined ?
3
border
border
Jules Verne 2020 - "Start NOW" discrepancy VS real time
7
border
border
Would like to know the reasenable time to update your pisition on zezo
16
border
Show more ...
border
home | the charts | forum | q&a | about | contact | Privacy and cookie settings
Copyright 2009 by ZEZO.ORG. All Rights Reserved.