PSA:
The NWS always appreciates observations, especially detailed observations that everyone on here is capable of giving. That can be done thru Twitter, as they often set up a feed for that, or the mPing app. That can include final snowfall amounts, when the snow starts/stops, precip type, dew point, etc
This helps them with short term forecasts as well as future forecasts as they can learn from them. A few years ago they had a freezing rain advisory for Leavenworth, but I notified
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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Posted by Brian_in_Leavenworth,
IOS Link:https://apps.apple.com/us/app/mping/id584383400 Android: https://play.google.com/store/apps/details?id=edu.ou.cimms.mping&hl=en_US&gl=US&pli=1
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