The featured chart displays the combination of Model Output Statistics (MOS) forecasts and observations for Des Moines this month. MOS forecasts take raw forecast model output and apply statistical models to it based on time series data from observation sites. The hope is to account for biases in the model by fitting the model output to the local observation data. These MOS forecasts come out multiple times per day with each forecast producing data for the next few days into the future. Combining these forecasts in time create ranges of forecasted values that are expressed by bars in this chart. The actual observations from the site are the dots. You can now generate these charts on demand on the IEM website!

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Tags:   mos