I just got this in my e-mail:

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Info on Mt Rainier debris flow
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From: Dan Shackelford

Around 10 pm, last night, a "glacier outburst" took place from the Van
Trump Glacier into the Van Trump Creek, which drains into the Nisqually
River. This appears to be the result of unusually hot Summer temperatures
melting glacial ice, which ponded under the glacier, and not from thermal
activity. Luckily, the rivers are low right now due to the Summer drought,
and not injuries or damage have been reported.

And I did find this reference to the heat's effect on this weekend's walkers - maybe my office-mate exaggerated a bit:
AUBURN — More than 75 people suffered heat exhaustion and 30 required brief hospitalization yesterday after they completed the first leg of the Avon Breast Cancer 3-day Walk in temperatures that reached 88 degrees. (Maybe it just felt like 100?)

Canie