Almost looks March 2012 like at times, and the 18z run came in even more robust with it. Tried warning y’all the ridge means business. Hell record highs were already being set across the region yesterday (International Falls shattered the old daily record by 7 degrees), and we’re just in the early stages of this major pattern transition. Kind of a miracle how the pattern has played out the last few weeks tbh (very likely, at least in part, due to the extremely early season SSW event). it’s looking that it may be coming to an end for good though.

Anyone have any 500mb height reanalysis dating back before 1950? Euro reanalysis stops there. Working on a project in another thread

This is an archive intended for personal use, and of course for all to reference if they so please. This will be a post-by-post archive of every arctic blast to affect Seattle, WA. Yes this is Seattle centric, but there will be stats for BLI, OLY, PDX, and EUG as well. Arctic blasts I am defining by any weather pattern with a high below freezing. This is cold enough that it should weed out all but the chilliest inversion setups, and even then those such inversions are usually aided by backdoor easterlies of some kind. Each blast will get its own post, and will be ordered from most recent to oldest. Extended events like January 1950 with warm interludes will be analyzed by each individual dip, as well as in aggregate. The aggregate posts will be labeled as such. The posts will be organized as follows: -500mb height loop for the relevant timeframe, including the buildup and aftermath. -Min/Max / Min for the blast at each listed site -# Subfreezing highs at each site -Average temps at each site, including anomalies compared to average -# snow (in) at each site

The officials sabotaged their plane too right?

And to be fair, the 1917 freakishness works both ways. December 1917 is still the all-time warm champ in downtown Portland and places like Pendleton and Eugene. Across the airport era so far at least there has yet to be a warmer December in Oregon (1950 was a bit cooler).