Simple

1. For a summary of symbols commonly used on weather maps, this brief guide from NWS may help (21/03/00)
2. A detailed description of how to read station plots, from the College of Dupage Nexlab (20/05/00)

Advanced

1. From Tim Vasquez's WeatherGraphics, sheets you can print out showing surface synoptic chart symbols, together with a brief description of their meaning. There are two charts: present weather symbols and cloud, pressure tendency and past weather symbols. These are taken from Tim's popular Weathergraph. (17/03/01)
2. Dave Wheeler's summary of meteorological codes used at observing stations (21/03/00)
3. A Case for Detailed Surface Analysis, by Sanders and Doswell. US based. (07/05/00)
4. Problems and Solutions for Drawing Fronts Objectively by McCann and Whistler. US based.  (07/05/00)