As part of studing energy issues (for more info see my gas blog I have been looking at the weather forecasts. It is quite interesting how much reasonably reliable information is available on the web. Sites such as Net Weather provide this information as well as referencing other sites such as Wetter Zentrale which is in German. Forecasters generally start with numerical models of the weather. The charts generated by those models are then available on various net sites. One of the systems most frequently reviewed is the US Global Forecast System. (GFS) This system takes in standard data for four runs. The four runs are indicated by the GMT time that they take the data from. They are then available about 5 hours later. One aspect that varies for GFS is that different sets of data are input for each run. The variations are: 00z - Weather buoy, satellite data, shipping data, country data, NOAA data 06Z - Weather buoy, satellite data, shipping data 12Z - Shipping data, Satellite da
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