Really, really lovely cumulonimbus action tonight! I just happened to have my drone in the car and got some solid shots of DT Seattle/Lake Washington/Mercer Island/Bellevue looking north from Skyway. Alas, the focal length of the lens doesn't do the vertical height justice and my WB was off rendering it into semi-gross HDR territory, but still... fun looking weather! It was quite windy- I was flying right at 390 ft and the drone was giving me all sorts of warnings about sustained winds/gusts.
A most incredible snow storm. At times the snowfall rates have been as heavy or slightly heavier than January 2017. Temp 27.5, Dewpoint: 27.1 with gusty east wind and very heavy snow continuing. I'm at 11 1/2" now! UNBELIEVABLE!!!! This pic does no justice at all.
NBM is quite an interesting product! Their weighting algorithm is moderately complex and dynamic, though does has some drawbacks as we saw yesterday. For those who don't know, NBM is an attempt by NOAA to create a super probabilistic forecast model that ingests output from all the models above and outputs forecast guidance for local offices that help them to gauge the relative odds of particular weather outcomes. The 'special sauce' is the post-processing, normalization and weighting that they d
To me, in layman’s terms, it seemed like things lined up just right with the sudden amplification of the pattern and the position of the ULL offshore to our SW to basically pull a “lobe” of the 4CH directly over our region with very little time for the airmass to moderate. And thanks to the ULL positioning dragging the center hottest air far to the NW, offshore flow became possible in the low levels which allowed an already bonkers airmass to become fully realized in the lowlands in a way that would usually be mitigated to some degree by flat or weakly onshore gradients.
Of course, down south, around or just after the summer solstice is when the 4CH can often be at its most robust, before it starts being eroded by monsoonal influence later in the summer. Which is why June is the hottest month of the year for some parts of the SW US.
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insta pin. glorious cloud pics!
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