{"id":5770,"date":"2020-12-09T22:25:00","date_gmt":"2020-12-09T21:25:00","guid":{"rendered":"https:\/\/ceylou.com\/wordpress\/?p=5770"},"modified":"2025-07-05T02:56:00","modified_gmt":"2025-07-05T00:56:00","slug":"regate-formation-meteo-1-bulletin-et-analyse","status":"publish","type":"post","link":"https:\/\/ceylou.com\/wordpress\/regate-formation-meteo-1-bulletin-et-analyse\/","title":{"rendered":"R\u00e9gate & Croisi\u00e8re formation m\u00e9t\u00e9o (1) BULLETIN ET ANALYSE"},"content":{"rendered":"\n

Echelle beaufort c’est quoi? <\/mark>vous etes ICI<\/mark><\/a><\/p>\n\n\n\n

Acc\u00e8s analyse m\u00e9t\u00e9o: Les nuages comment \u00e7a marche?<\/mark><\/a><\/p>\n\n\n\n

Comprendre la m\u00e9t\u00e9o …un peu !<\/mark><\/a><\/p>\n\n\n\n

c<\/p>\n\n\n\n

L’\u00e9chelle de Beaufort<\/strong><\/h2>\n\n\n\n

L’\u00e9chelle imagin\u00e9e par l’amiral britannique Beaufort, au d\u00e9but du XIXe si\u00e8cle, estime la vitesse du vent selon ses effets sur la marche d’un voilier, l’\u00e9tat de la mer, la fum\u00e9e des chemin\u00e9es et les arbres \u00e0 terre.<\/p>\n\n\n\n

Pour concevoir cette \u00e9chelle, l’amiral utilisa la voilure de la fr\u00e9gate qu’il commandait comme instrument de mesure et d\u00e9termina 12 degr\u00e9s ou intervalles de vitesse de vent. <\/p>\n\n\n\n

En 1874, l’utilisation de l’\u00e9chelle de Beaufort <\/strong>est:<\/h3>\n\n\n\n

Adopt\u00e9e internationalement comme unit\u00e9 de mesure de la force du vent dans les observations m\u00e9t\u00e9orologiques en mer.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
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Voir aussi ETAT DE LA MER<\/a><\/h3>\n\n\n\n
\n\n\n\n

L’\u00e9chelle Beaufort sera utilis\u00e9e jusqu’en 1946<\/strong>, date \u00e0 laquelle l’Organisation m\u00e9t\u00e9orologique mondiale d\u00e9cide que les observateurs en mer utiliseront le n\u0153ud comme unit\u00e9 de mesure de la vitesse du vent.<\/strong><\/p>\n\n\n\n

L’\u00e9chelle continue d’\u00eatre utilis\u00e9e en m\u00e9t\u00e9orologie marine, en particulier dans la r\u00e9daction des bulletins de pr\u00e9vision marine. <\/p>\n\n\n\n

On parle alors de \u00ab force \u00bb<\/em> du vent. Ainsi la force 4 correspond \u00e0 la \u00ab jolie brise \u00bb<\/em> et la force 10 correspond \u00e0 la \u00ab temp\u00eate \u00bb. <\/p>\n\n\n\n

L’echelle beaufort est une estimation relativement impr\u00e9cise, <\/em>“pifom\u00e9trique”, empirique, invent\u00e9e quand les instruments de mesure \u00e9taient archa\u00efques . <\/p>\n\n\n\n

Quelques Pr\u00e9cisions importantes:<\/h3>\n\n\n\n


A vrai dire entre Le bas<\/strong>( du range) d’une force et le haut<\/strong> (du range)
il y a entre un \u00e9cart 4 et 5 n\u0153uds.<\/strong>
(c’est beaucoup vous croyez etre encore \u00e0 force 5 mais en r\u00e9alit\u00e9 vous \u00eates d\u00e9j\u00e0 \u00e0 force 6)<\/p>\n\n\n\n

par exemple <\/em>force 6<\/strong> signifie que le vent soufle entre<\/em> 22 ET 27 N\u0153uds
donc vent qui oscille entre \u00e0 27 30 N\u0153uds vous \u00eates \u00e0 force 7
et en plus selon l’\u00e9diteur <\/strong>de l’\u00e9chelle il peut y avoir des diff\u00e9rences.<\/p>\n\n\n\n

attention aux rafales<\/h4>\n\n\n\n

Vent instantan\u00e9, vent moyen et rafaleL’air s’\u00e9coule en g\u00e9n\u00e9ral irr\u00e9guli\u00e8rement
entrainant une forte variabilit\u00e9 du vent en direction et en force.<\/p>\n\n\n\n


C’est pourquoi, les m\u00e9t\u00e9orologues mesurent le vent instantan\u00e9 qui varie sans cesse
et le\u00a0vent moyen<\/strong>\u00a0calcul\u00e9 sur une p\u00e9riode de 10 minutes qui figure dans les bulletins. <\/p>\n\n\n\n


Lorsque la vitesse du vent instantan\u00e9 d\u00e9passe celle du vent moyen de plus de 10 n\u0153uds (18 km\/h)
les m\u00e9t\u00e9orologistes parlent de\u00a0rafale<\/strong>.
Lors d’une rafale, la direction du vent peut varier de plus de 45\u00b0.
Si la diff\u00e9rence de vitesse entre vent instantan\u00e9 et vent moyen
est comprise entre 15 et 25 n\u0153uds (entre 28 et 46 km\/h), on parle de \u00ab fortes \u00bb rafales.
Lorsque cette diff\u00e9rence exc\u00e8de 25 n\u0153uds (46 km\/h) il s’agit de \u00ab violentes \u00bb rafales.<\/p>\n\n\n\n

\n\n\n\n
\"\"<\/span>
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Aqualimba marine<\/strong> Accastillage & voiles<\/em><\/span><\/a><\/p>\n<\/div><\/div>\n\n\n\n

\n\n\n\n

D\u00e9finitions METEO FRANCE.<\/h2>\n\n\n\n

Vent instantan\u00e9, vent moyen et rafale<\/h3>\n\n\n\n

La variabilit\u00e9<\/strong> du vent (force, direction) en un endroit donn\u00e9 est g\u00e9n\u00e9ralement forte.<\/p>\n\n\n\n

C’est pourquoi les m\u00e9t\u00e9orologues mesurent le vent \u00ab instantan\u00e9 \u00bb<\/strong> et le vent \u00ab moyen \u00bb<\/strong>. <\/p>\n\n\n\n

Le vent instantan\u00e9<\/strong> est mesur\u00e9 sur une p\u00e9riode de 3s. <\/strong>
Le vent moyen<\/strong> est calcul\u00e9 sur une p\u00e9riode de 10 minutes.<\/strong><\/p>\n\n\n\n

Une rafale<\/strong> est une brusque augmentation du vent instantan\u00e9<\/strong>,
 d\u00e9passant le vent moyen de plus de 10 n\u0153uds<\/strong> (18 km\/h). <\/p>\n\n\n\n


 Lors d’une rafale, la direction du vent peut \u00e9galement varier,<\/strong> 
tournant quelquefois de plus de 45\u00b0 par rapport \u00e0 celle du vent moyen.<\/p>\n\n\n\n


 Les rafales sont d’autant plus vigoureuses que l’air est instable<\/strong>
 (orages ou giboul\u00e9es). Etre tr\u00e9s attentifs aux orages en \u00e9t\u00e9<\/strong> <\/p>\n\n\n\n


le vent moyen<\/strong> est fort aux endroits o\u00f9 l’\u00e9coulement de l’air est perturb\u00e9
par le relief (ou les constructions urbaines)<\/strong><\/p>\n\n\n\n

\n\n\n\n

Les bulletins m\u00e9t\u00e9o de la TV<\/strong><\/h2>\n\n\n\n

Ils sont en kmh<\/strong><\/em> parceque peu de gens connaissent les n\u0153uds et les miles<\/em> ,  20 n\u0153uds avec une corde \u00e7a fait beaucoup de n\u0153uds ! pourquoi faire autant de n\u0153uds ????.<\/p>\n\n\n\n

Pourquoi des N\u0153uds?<\/strong><\/h3>\n\n\n\n

Le”speedom\u00e8tres est une invention r\u00e9cente,<\/p>\n\n\n\n

Ainsi donc les mesures ce faisaient en laissant filer une “corde”  avec un n\u0153uds le Loch<\/strong><\/p>\n\n\n\n

Voila l’engin !!!! ci-dessous<\/p>\n\n\n\n

DESCRIPTION:<\/h3>\n\n\n\n
\"\"<\/span>
\n

le loch, pour mesurer la vitesse<\/strong><\/p>\n<\/div><\/div>\n\n\n\n

La planchette en forme de triangle,<\/strong> \u00e9tait amarr\u00e9e \u00e0 un cordage <\/em>comportant des n\u0153uds<\/em> r\u00e9guli\u00e8rement espac\u00e9s qu’un marin comptait \u00e0 haute voix au fur et \u00e0 mesure
qu’ils glissaient entre ses doigts.<\/p>\n\n\n\n

instrument archa\u00efque dont la pr\u00e9cision d\u00e9pendait donc du matelot qui comptait…..<\/p>\n\n\n\n

Finalement Le compte se faisait pendant le temps d’\u00e9coulement d’un sablier<\/em>.
Le nombre r\u00e9sultant, exprim\u00e9 en n\u0153uds, mesure donc une vitesse <\/strong>et
non pas une longueur.<\/strong><\/p>\n\n\n\n

Diff\u00e9rences marine anglaise et fran\u00e7aise<\/h3>\n\n\n\n

Il est a noter que dans la marine fran\u00e7aise<\/strong>, les n\u0153uds \u00e9tait espac\u00e9s
de 47 pieds et demi soit 15 m\u00e8tres et 43<\/em> centim\u00e8tres et
le sablier \u00e9talonn\u00e9 sur une p\u00e9riode de 30 secondes <\/em>.<\/p>\n\n\n\n

Alors que dans la marine Britannique <\/strong><\/em>les n\u0153uds \u00e9taient espac\u00e9s <\/sup>
de (47 pieds et 3 pouces, soit 14,4 m, et <\/sup>
le sablier de 28 secondes ).<\/sup><\/p>\n\n\n\n

Ce qui fait qu’un bateau britannique qui naviguait \u00e0 5 n\u0153uds <\/em>
n’avait pas la m\u00e8me vitesse qu’un bateau fran\u00e7ais navigant lui aussi \u00e0 5 n\u0153uds….<\/em>
facile<\/em> n’est ce pas <\/em>?<\/p>\n\n\n\n

Nous marchons \u00e0 5 n\u0153uds, eux aussi, mais on va moins vite….<\/em>..<\/strong>.<\/p>\n\n\n\n

\n\n\n\n

SPEEDOMETRE:<\/h3>\n\n\n\n

Le rempla\u00e7ant<\/strong> moderne du loch s’appelle un speedometres (SPEEDO)<\/strong> et \u00e7a ressemble \u00e0 \u00e7a.<\/p>\n\n\n\n

\"\"
Speedo moderne avec vitesse, cap ,distance…. etc etc etc.<\/figcaption><\/figure>\n\n\n\n

Tout d’abord, Y-A-TOUT  sur l’\u00e9cran ! la vitesse sur l’eau, sur le fond, le cap, la d\u00e9rive ……..etc etc etc.<\/p>\n\n\n\n

Eh, ho! ne reste pas les yeux riv\u00e9s sur cet \u00e9cran l\u00e9ve  la t\u00eate <\/strong>.<\/p>\n\n\n\n

Afin de Respirer, barrer avec tes <\/strong>sens, profite du vent, de la mer, du soleil !<\/em>
ce n’est pas un jeu vid\u00e9o !
les yeux vont te tomber de la t\u00eate a fixer cet \u00e9cran.<\/p>\n\n\n\n

Enfin pense Plut\u00f4t \u00e0 r\u00e9gler tes voiles pour aller plus vite et faire plus de cap,
ou r\u00e9duire la toile avant que le vent devienne fort et
que le bateau soit en surpuissance.<\/strong><\/p>\n\n\n\n

Finalement s’appliquer a barrer correctement,<\/em> c’est agir comme un vrai marin.<\/strong><\/p>\n\n\n\n

L’\u00e9lectronique c’est nickel chrome.<\/strong> <\/h3>\n\n\n\n

Ainsi il est possible de rester chez-soi et jouer \u00e0 Virtuel machine !<\/p>\n\n\n\n

OU PIRE REGARDER UN TUTOS<\/p>\n\n\n\n

En virtuel<\/strong> tu ne sais m\u00e8me pas qu’il y a un pont sur le bateau,
un pont balay\u00e9 par le vent, les vagues……
un pont ou il faut se cramponner et quand m\u00eame man\u0153uvrer…<\/strong><\/p>\n\n\n\n

C’est juste un jeu o\u00f9 les bateaux virtuels ne g\u00eetent pas,
o\u00f9 on n’a rien sous les pieds et
o\u00f9 on ne sent pas la caresse ou la morsure du vent.<\/p>\n\n\n\n

C’est aussi le jeu o\u00f9 les voiliers se croisent en se marchant dessus,
sans r\u00e8gles de priorit\u00e9 …..ah ,ah ,ah !
Le RIPAM ce n’est pas pour les virtuel-gateurs.<\/p>\n\n\n\n

DONC SURTOUT, TU NE MAN\u0152UVRES JAMAIS DANS CES JEUX<\/em> !<\/strong><\/p>\n\n\n\n

sur “virtual machin ” On ne fait jamais une man\u0153uvre<\/strong> d’envoi ou d’affalage de spi……  <\/strong><\/p>\n\n\n\n

Donc on ne peux pas la rater la man\u0153uvre, n’est ce pas?<\/strong><\/p>\n\n\n\n

C’est du v\u00e9ritable similicuir avec la ficelle du m\u00eame m\u00e9tal,
du “Canada dry” sans alcool.<\/strong><\/p>\n\n\n\n

Sensation z\u00e9ro , plat de chez Platibus.<\/strong><\/p>\n\n\n\n

Tandis que l\u00e0 sur l’eau,<\/strong> sur ce vrai bateau qui bouge,<\/p>\n\n\n\n

Tu peux la rater cette fichue man\u0153uvre et \u00e7a peut tr\u00e8s vite d\u00e9g\u00e9n\u00e9rer<\/em>.<\/p>\n\n\n\n

Et puis Pendant le temps o\u00f9 tu es vautr\u00e9<\/strong> sur l’eau suite \u00e0 un d\u00e9part au lof,
les autres se marrent et te d\u00e9passent pleine balle…….<\/strong><\/p>\n\n\n\n

C’est le moindre mal, parceque des fois \u00e7a casse !<\/p>\n\n\n\n

Aller soit sympa  laisse tomber ton \u00e9cran<\/em> !
Regarde le autant que la jauge \u00e0 carburant de ta bagnole, tu sais cet engin mobile \u00e0 bord duquel tu DOIS regarder prioritairement la route….. <\/em>
et pas le GPS ou la pendule.<\/em><\/p>\n\n\n\n

Mais ce n’est pas le sujet, je m’\u00e9gare,
revenons \u00e0 nos moutons le Speedo, gradu\u00e9 en miles nautiques.<\/em><\/p>\n\n\n\n

\n\n\n\n

NAUTIQUE pourquoi ?<\/h2>\n\n\n\n

Pourquoi les marins et  les pilotes d’avion  utilisent  le terme “NAUTIQUE”<\/strong>
 pour d\u00e9signer le noeuds ou “mile nautique” ?
 Il est \u00e9vidant que  dans une conversation radio,
le mot  “nautique”<\/em> \u00e9vite des probl\u00e9mes, des confusions .<\/p>\n\n\n\n

 En navigation a\u00e9rienne et maritime le terme \u00ab nautique \u00bb<\/em> est utilis\u00e9
afin d’\u00e9viter toute confusion
avec le mile<\/em> ou l’adjectif num\u00e9ral mille.<\/em> <\/p>\n\n\n\n

exemple :<\/em><\/p>\n\n\n\n

– On dit:<\/strong> le bateau qui arrive est \u00e0  une distance de 10 nautiques<\/em> .<\/p>\n\n\n\n

On ne dit pas:<\/strong> 10 miles ou milles <\/p>\n\n\n\n

-Le bateau ou l’avion qui approche est \u00e0 une distance de 20 nautiques.<\/em><\/p>\n\n\n\n

–L’entr\u00e9e du port est \u00e0 20 nautiques.<\/em> <\/p>\n\n\n\n

On peut rajouter le cap.<\/strong> <\/p>\n\n\n\n

Le langage radio est tr\u00e9s pr\u00e9cis<\/strong> pour \u00e9viter toutes erreur
on ne dit pas
cap 320 <\/strong>mais 3 – 2 – 0<\/p>\n\n\n\n

\n\n\n\n

Comment transformer rapidement et facilement les Km\/heure en n\u0153uds<\/strong>?<\/h2>\n\n\n\n


( abr\u00e9viation \u00e9crite utilis\u00e9e sur certain document <\/strong>
” Kn” pour Knots).<\/strong><\/h4>\n\n\n\n

Diviser<\/strong> les KmH par 2 et rajouter 10%  du r\u00e9sultat<\/strong> obtenu au  r\u00e9sultat de la division par 2<\/p>\n\n\n\n

Vent de : 50k\/h<\/strong><\/p>\n\n\n\n

50 \/ 2 = 25<\/p>\n\n\n\n

+<\/strong> 10% de 25 = 2,5<\/p>\n\n\n\n

25 + 2,5= 27,5 N\u0153uds.<\/p>\n\n\n\n

Vous obtenez une valeur tr\u00e8s rapproch\u00e9e<\/strong>.<\/p>\n\n\n\n

27,5 x 1,852 = 50, 93 SOIT ENVIRON 51 kmh<\/strong> a rapprocher de 50.<\/p>\n\n\n\n

\n\n\n\n

Etat de la mer<\/h2>\n\n\n\n

La hauteur des vagues
se mesure du creux entre deux vagues \u00e0 la cr\u00eate de la vague. <\/em><\/p>\n\n\n\n

Du fait de la nature al\u00e9atoire des vagues, l’\u00e9tat de la mer est d\u00e9crit par des param\u00e8tres statistiques, comme la moyenne des hauteurs<\/em>, des p\u00e9riodes ou des directions.<\/p>\n\n\n\n

De telles mesures sont difficiles \u00e0 faire \u00e0 l’\u0153il nu.<\/strong><\/em> <\/p>\n\n\n\n

Ainsi, de nombreux syst\u00e8mes de mesure ont \u00e9t\u00e9 mis au point, depuis la perche \u00e0 houle jusqu’aux radars embarqu\u00e9s sur des satellites.<\/p>\n\n\n\n

L’\u00e9tat de la mer est souvent compos\u00e9 de “houles”<\/em> sans lien avec le vent local, et d’une “mer du vent”<\/em>. <\/p>\n\n\n\n

La cambrure de la mer du vent \u00e9tant g\u00e9n\u00e9ralement plus forte, il est a noter que c’est la hauteur significative de la mer du vent<\/em> qui est souvent le param\u00e8tre le plus important.<\/em><\/p>\n\n\n\n

Les marins utilisent couramment l’\u00e9chelle de Douglas<\/em>, qui donne 9 classes de valeur pour cette “hauteur de la mer du vent”, de mer 0 \u00e0 mer 9 :<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Retour \u00e9chelle beaufort<\/a><\/h2>\n\n\n\n
\n\n\n\n

Acc\u00e8s analyse m\u00e9t\u00e9o: Les nuages<\/a><\/h2>\n\n\n\n

Comprendre la m\u00e9t\u00e9o<\/a><\/h2>\n\n\n\n

RETOUR METEO<\/a><\/h2>\n","protected":false},"excerpt":{"rendered":"

Echelle beaufort c’est quoi? vous etes ICI Acc\u00e8s analyse m\u00e9t\u00e9o: Les nuages comment \u00e7a marche? Comprendre la m\u00e9t\u00e9o …un peu ! c L’\u00e9chelle de Beaufort L’\u00e9chelle imagin\u00e9e par l’amiral britannique […]<\/p>\n","protected":false},"author":1,"featured_media":7532,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_crdt_document":"","_uf_show_specific_survey":0,"_uf_disable_surveys":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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