South America from ECMWF (click "deterministic or enseble")
http://www.ecmwf.int/products/forecasts/d/charts/medium/

NOAA Meteogram
http://ready.arl.noaa.gov/READYcmet.php

Cerro Torre coordinates -49.3 latitude and -73.1 longitude. (CONTINUE)
Select first map. (GO)
(x)Default with winds (x)Speed and Direction. (GET METEOGRAM)

Good weather usually with wind from S or SW and most storms come from the W or NW.

Wind report and cloud cover for El Chalten from Windguru.cz (click "knots" to get km/h)
http://www.windguru.cz/int/index.php?go=1&lang=eng&vs=1&sc=231428&wj=knots&tj=c&odh=3&doh=22&fhours=180

Overview from Meteoexploration.com (based on GFS).

More detailed from Meteoexploration.com (WRF model, based on GFS data).

Detailed Meteogram from Meteoexploration.com (based on GFS).

Detailed Wind Levels from Meteoexploration.com (based on GFS).

Wind map for South America from Meteoexploration.com (click "Winds")
http://www.meteoexploration.com/mountain/forecastSAndes.html

Above Cerro Torre Meteogram and Wind Level chart links to Meteoexploration.com (click "Wind levels")
http://www.meteoexploration.com/mountain/peaksSAndes.html?CTR