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December Med/Long Range Discussion


WinterWxLuvr

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Biggest take away I have after looking over the 500's on the 00Z runs is that the axis of the trough as it drives down into the US will be the key to our weekend storm. Simply put, the sharper the positive tilt the more the heights are allowed to build in front of the storm. 

Looking at the GEFS, the worst solution for wintry weather, we have the strongest positive tilt of the 3 models as the trough is entering the US at 120 hrs. The axis tilt can basically be followed by looking at the anomalies from north to south. When looking 2 days later, hour 168, you can see that we still have a strong positive tilt that leaves the base of the trough back in California. This allows heights to build substantially bringing a strong southerly flow and the warm temps with it.

gfs-ens_z500a_namer_21_1_60.png

gfs-ens_z500a_namer_29_1_60.png

 

Now when we look at the EPS, which is the middle of the road solution, we see that the positive trough axis is not as extreme as the GEFS solution coming down into the US thus when we look 2 days later we see that there is still a moderate positive tilt that but the base of the trough has progressed more easterly then the GEFS which does not allow the heights to build as much in front of our system. The southerly flow is not as strong and we don't see near the warm temps that the GEFS advertises.

 

ecmwf-ens_z500a_namer_6_1_60.png

ecmwf-ens_z500a_namer_8_1_60.png

The best solution of the three models. the CMC, has the least extreme positive tilt of the three and is already placing the base of the trough into the southwest at hour 120. Looking 2 days later we now see that we have a neutral tilt with the trough and its base located just west of the Mississippi. This solution never really allows the heights to build into our region which damps down the southerly flow. Thus bringing us the coldest solution of the 3 models.

gem-ens_z500a_namer_21_1_60.png

gem-ens_z500a_namer_29_1_60.png

 

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