To simplify it, the poleward transport of westerly momentum (culminating as a stronger/poleward northern jet) can “abandon” components of middle latitude waves. Which under certain wavenumbers (and other seasonal boundary conditions) can lead guide those waves into a state of quasi-resonance and/or amplifying constructive interference.
The timing of all elements has to be absolutely perfect for an outcome like June 2021. The probability of that happening is so low that it almost never happens.
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