1. Upper Air

4. Cold in the center (-46 C) Warm (-31 C)

6. Jet Stream

13. This is the NYC blizzard of Dec 26-27, 2010

15. Snowfall Dec 26-27, 2010

18. Summary  Surface Lows tend to be east of upper air troughs. Troughs are cold.  Cold surface Highs tend to be east of upper air ridges. Ridges are warm.  Jet streams help air to move upward which helps create precipitation.  Knowing where the surface Highs, Lows, and fronts are going to be means you can forecast using the Norwegian Cyclone Model.