And here’s an additional exercise in meteorological forensics…
At frame #61, from the
Visible Satellite GIF loop (previously posted
here), taken at 6PM local time when the sun was only 21 degrees above the western horizon, a very large and cigar shaped shadow extends from a WNW to ESE angle on the image (see first image below). (For sun angle calculations see here:
NOAA Solar Position Calculator )
As it’s late in the afternoon, a time when shadows fall towards the east, and the shadow’s western edge is close to the Gerrish-Chung location, it's clear that the object casting this shadow - in this case a cloud formation - is evidently directly above them at the moment:
Overlaying the image into Google Earth (by aligning the Mariposa County and YNP borders & roads) and taking a measurement of the shadow’s length, it appears to be about 12.2 miles long or 64,420 feet.
This begs the question “How high does an object have to be, at that location, that date, and that KNOWN time of day to cast a shadow that is 12.2 miles long?
Luckily there’s an ONLINE CALCULATOR that can spit out a quick result:
Online calculator: Shadow length
Rounding off the Gerrish-Chung location to +37 45’ 5” N by -119 49’ 46” with a UTC offset of -7 hours (the current Daylight Time Differential), the calculator indicates that in order to cast a shadow at that location on 8/15/21 at 1800 hours the object would have to be…
…24,821 feet high.
But that’s just if it were casting its shadow on THE GROUND of course. In frame #61 it most likely casting its shadow on other clouds which are also aloft. Simple geometry dictates that the height to cast a shadow that long on another object that’s not at ground height would have to be even higher.
Then add in the fact that the river near the Gerrish-Chung location was already about 1,900 feet in elevation (at the river), and the cloud base may have been many hundreds or a few thousand feet above the ground level itself… and it becomes evident that whatever was casting that shadow it could have easily been topping 30,000 feet at the time. Which is consistent with the noticeable imprint this cell made on the water vapor satellite returns (see “
02-Satellite-Water-Vapor.gif” from my
previous post).
Naturally, if my assumption that the “cigar shaped shadow” isn't really a shadow at all but just some “dark trough” in the clouds, then it of course renders this post invalid altogether... but if one scrutinizes the frames before and after frame 61, it seems evident that the “shadow” in question moves and morphs in a way that’s completely consistent with the low sun angle of the hour as well as the depth of pixel darkness exhibited by the what is quite
obviously a shadow emanating from cell 2’s sudden build up to the ENE.
Cumulonimbus towers are often electrically charged monsters by time they reach that height. They may have perished by heatstroke of course earlier in the day. But if not… I’d hate to be the tallest thing trudging up that completely barren slope when this thing was overhead.