Often the MRF will dig troughs in the height field too far south across the Great Lakes and Northeast regions, most noticeably after about Day 3. However, this is a personal observation and requires considerable objective quantification. The MRF still has a problem maintaining correct amplitude to low wave number regimes. This problem is important during situations involving Arctic outbreaks. Still addressing the planetary-scale waves, especially poleward of about 50 deg north, the MRF has a tendency to be too retrogressive, most noticeable beyond day 5.
Westerlies are often too far south.
The model likes to lower sea-level pressures too much and too far south. A result of this problem can be that synoptic-scale fronts are implied to be too far south. Medium-Range Forecast Model. There are some situations, especially during the warmer portion of the annual cycle, when this model has too many closed gyres. This bias may be related to its T216 wave number resolution.