The Winter of 2019-2020 was never going to be one. And, in the future, when I look at the teleconnections in November and they look almost the same as they do as we enter March then that’s probably telling us all something. I’ve learned my lesson.
The teleconnections are one small piece of the puzzle of forecasting in meteorology. They provide us with a snapshot of what the atmosphere is doing.
The PNA is the Pacific-North American index. This tells us what kind of ridging is taking place. A (+) PNA tells us there is high ridging out west allowing storms to come in, up and over the Rockies, and down the shute towards the middle of the country and East Coast. A (-) PNA tells us the opposite. There is no ridging. Meaning there are flat waves coming in from the Pacific. It’s most progressive.
The NAO is the North American Oscillation index. It gives us a view of high latitude blocking over Greenland. A (-) NAO tells us there is blocking. A (+) NAO tells us there is hardly any block. This is key in that if a storm is coming up the East Coast it doesn’t allow it to cut towards the Great Lakes or through the Appalachians. Both cases provide us with mostly rain.
And the last the EPO is our cold air source. (+)EPO tells us there is no cold air source. A (-)EPO says there is a cold air source and it has staying power depending on how negative it is.
These are two indices from the last two weeks. And, as you can see, none of them are good for East Coast storms/snow in the winter months. If there is no cold air, if storms are just coming in and coming out, and if there is very little blocking then you can almost book it there won’t be any snow coming our way anytime soon.
And this has been the story the entire winter. It’s officially over in a couple of weeks, but meteorology winter is over tomorrow- March 1st.
Folks, it’s over okay. That’s it.
It is what it was. The DEAD winter of 2019-2020 with an official grand total of 0.9 inches of snow in the state of Delaware.