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Below follows some useful links for the weather part of flight planning. The links are in no particular order but loosely divided into different categories.

Most of these links are from a compilation by Scott Dennstaedt. Scott runs the excellent web site Avwxworkshop where you can find detailed discussions about weather for pilots and how to use various weather forecasting products. I can highly recommend this source for weather know-how essential for pilots.

 

Aviation weather links in general

ADDS
Weather Channel
DUATS

 

Surface Analysis

Current
Loop 21 hours
Loop 3 days
Storm Prediction Center (overview)
Enhanced SPC overview
Storm Prediction Center Day 1
Storm Prediction Center Day 2
Storm Prediction Center Day 3

 

Outlook and Forecast Discussions

NWS Outlook
NWS Discussions
Extended Outlook Discussion
Short Range Forecast Discussion
0–7 Days Fronts
Area Forecast
NexRad Image

 

Stability and instability

Lifted Index Maps
Surface Based CAPE
Most Unstable CAPE
Convective Outlooks

 

Some imagery

Water Vapor Satellite

 

Models

NCEP Models
RUC Models
RUC Soundings

 

South America

Weather Underground
Direccion Meteorologica de Chile
Model Soundings

To use the model soundings for South America, choose the GFS as initial data source, up to 72 hours for the forecast time and then put in the nearest airport identifier (SCCF for Calama, SCEL for Santiago). Hit SIMPLE java plots, or, for a more detailed sounding plot: Java-based plots.

Aviation Weather (GEOS IR images among many other things)
Meteo Centrale
(Forecast weather for 48 hours – images and movies)