The forecast for the beginning of this week has been difficult to pin down as models have advertised wildly varying temperatures. The featured chart shows the range of forecasted daytime high temperature and overnight low temperature based on NAM Model Output Statistics (MOS) for Des Moines. The MOS output attempts to take raw numerical model output on a grid and tailor it for specific locations where observations are available. The range plotted is produced by looking at the various forecast model runs leading up to a day. The dots represent what actually happened. The forecast for today is shown as large bars, meaning the models have produced a wide range of values over time leading up to today. A more definite forecast is that it will get cold later this week, so enjoy whatever happens today!

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