Remnants of Tropical Storm Iselle will send considerable mid- and upper-level moisture, and some marginal mid-level instability, toward CA over the next 48 hours. Expect "tropical skies," continued elevated humidity, & isolated light showers/very slight chance of t-storms. #CAwx

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Although it has dropped out of news in recent days, wildfire activity across western U.S. and SW Canada remains very high, with numerous large fires active. Fires are now more broadly distributed vs. early in the summer, stretching from central CA to southern BC & east to ID/MT.

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I am neither a geologist nor a glaciologist--though I am a climate scientist, and there likely is a climate change contribution to this disaster. Mountain glaciers are melting rapidly, & mountainsides buttressing them are destabilizing. But exact mechanisms here remain TBD.

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The immediate priority in the aftermath is still search and rescue and acute-phase disaster recovery, of course. But the broader context here is also important, as this is a classic "compound hazard" and subsequently "complex disaster."

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The sheer scale of destruction amid Himalayan glacier collapse disaster is horrifying, as is presumptive human toll. This was no mere flash flood or mudslide--it was more akin to a geologic-scale debris avalanche or "inland tsunami." The footage emerging is almost unbelievable.

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