I have not seen this kind of extreme range in the medium range computer models in years as seen for the Friday-Monday time frame projection. The variation in solutions from the various equations is amazing to see. The UKMET and ECMWF are the most extreme. While the Euro has been consistent for 3 runs in a row, there has not been a confluence trend in the other standard equations as of yet so I will give it no more weight than any deterministic model.  Given the seasonal history of northern stream dominance I will treat any southern jet stream systems as outliers.  So following more of a multi-model and ensemble mean approach that comes from the chaos theory of Lorenz, I will lean to a less dramatic forecast and away from the extremes, at least for now.  To see what I am forecasting click on link "our 5-day forecast".