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Pattern Dazzling December

500h_anom.na.png

GFS now shows a -PNA.
 
500h_anom.na.png

GFS now shows a -PNA.
Not really a negative PNA. A negative PNA is characterized by the difference between highest heights over the eastern pacific. So really, you look at the difference in heights between the US, and the lower heights east of Hawaii. The lower heights are still there, there just slightly weaker than 18z.
 
Just fired up a 192hr medium-res MMFS run.. the 144 hr didn't really show much here. Should have output in a few hours!
If I remember correctly from last January, your model appeared to have a bias to suppress systems. Is this the case and if so has there been updates to it?
 
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