Mobile version

Southern swell

Image of the Month - August 2011

Significant wave height measured by the current altimetry satellites (Jason-1, Envisat, Jason-2) over the Indian Ocean and south of it on August 3, 2011, left, from the along-track measurements of that day. Right wind speed (gridded merged altimetry data, using two days of data, and smoothing), that show the rather low winds at La Réunion latitude (21°S) (view also the wave height animation over a few days). (Credits Aviso)

On August 1st, 2011, Meteo France emitted an alert for La Réunion Island about high Southern swell for August 3. Such a swell, coming from some of the storms swiping the "roaring forties" (i.e. the Southern Ocean at about 40° latitude), is not abated nor lessen by the low winds in this area of the Indian Ocean. Southern swell occur from time to time, and can cause serious damages.

If altimetry in itself is not the mean to forecast them, the assimilation of altimetry significant wave height data in marine weather forecast models improve wave heights forecasts, if only by the fact that the satellites provide worldwide measurements.

See also:

Other websites on this subject:

Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

This home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!