MORE on Positive Vorticity Advection..

Just "GIVE ME MY SNOWFALL TOTALS!" you may say. I'm sorry, can't help myself.. have to show you the thinking behind it. The chart left shows one model which REALLY goes to town with the storm in producing both warm advection (see option 3, earlier discussion) and something called Positive Vorticity Advection. The latest close up for tomorrow morning clearly shows that the heavy snow may make it back on this chart all the way to Worcester! Click on the map, and you will see how the winds at the 700mb, 10,000 ft level are blowing across from "positive' to "negative" vorticity, or "twist" in the atmosphere. When that blows across a good temperature gradient, it snows or rains. Simple as that. It also produces high upward drafts called vertical velocity, and sometimes we get thunder inside snowstorms when that happens. Indeed our NAM computer model is calling for that too during our blizzard Sunday. For more info on reading weather maps, order the book WEATHERMAPS by PETE CHASTON. JUST CLICK THIS LINK.

Comments

[Jay Usher]

Once again Todd was RIGHT. Read his Positive Vorticity Advection Section! He actually said that this positive Vorticity may cause heavy snow to go all the way back to Worcester which it DID!!!! Jay Usher..Newton