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
For the early afternoon SRH is limited but CAPE is huge. The CAPE is probably overstated given entrainment, but this does certainly support large hail
Later in the day the hodograph blows out as the LLJ kicks in. This looks more like a QLCS tornado threat as a presumably linear feature moves in.
We've got a moderate for severe from SPC and for rain from WPC:
Some ML guidance shows the highest threat more towards my area like nadocast:
But others like CSU is a bit further west:
I'm inclined to think the biggest severe weather threat will be further west towards OKC. I expect to see several strong tornadoes and reports of very large hail. As the storms congeal we will get a wind/QLCS threat morphing into a heavy rain/flood threat overnight. I don't think we will get anything truly crazy, but a couple of inches wouldn't shock me.
Are you talking about the 8 weeks of July and August? Because it almost always rains in June and September with only a few exceptions. SEA averages .60 in July and .97 in August. So in order to have a rainfall every 2 weeks it would need just 2 each month.
July and August in recent years has been an anomaly.
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