is the weather changing or 1961 all over again.

[fjlip]

If only Mt St Helens or Pintabu or some others would change our climate again, everyone could agree on what the problem really is.

It will be blamed on CLIMATE CHANGE/ EMERGENCY/DISASTER...by the CULT

[chuckChuck]

Chuck, I'll ask the same question I asked Mustardman, and received no response. That is a very complicated quality to measure. How do you measure the historic jet stream undulations?

That's a good question for a climate scientist.

Meterologists have been producing weather maps with highs and lows and other features on them for many many decades. Weather balloons go back to the late 1800s. Take a look at their history.

https://sciencing.com/history-weather-balloons-5050060.html

High altitude bombers started near the end of the second world war.
https://www.weatheronline.co.uk/reports/wxfacts/The-Discovery-of-the-Jet-Stream.htm

Modern aviation requires lots of information about jet streams for navigation.

Its likely that climate scientists have several decades of post war historical jet stream patterns to compare.

Since climate scientists are saying that climate change is likely affecting the jet stream and producing more blocking situations, I think we should assume that they have the evidence and data to make that statement.