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Socalmountains.com :: Forums :: WEATHER DISCUSSION
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Purple Sunsets???

Author Post
Benny ⭐
Sat Aug 31 2019, 10:56PM Email Thread Print View


Joined: Fri Aug 18 2006, 05:54PM
:
Posts: 10886
Something that has been driving me nuts over the past few weeks, the purple hue every day at sunset... Not reading too much into it, I assumed it was just haze and dust off the desert. When in reality, it's the result of 2 Volcano's around our planet spewing ash up into the stratosphere.

Here's an article courtesy of spaceweather.com

Every year, on average, about 60 volcanoes erupt somewhere on Earth,
shooting ashy plumes of sulfurous gas thousands of feet into the air.
Rarely do those plumes make it all the way up to the stratosphere.
This summer, however, two volcanoes have done it. The Raikoke volcano
in the Kirul Islands (June 22nd) and the Ulawun volcano in New Guinea
(Aug. 3rd) both punched through to the stratosphere, sending material
as high as 60,000 ft.

The action of these two volcanoes may explain why many sky watchers
are starting to notice purple sunsets.

Why purple? Fine volcanic aerosols in the stratosphere scatter blue
light which, when mixed with ordinary sunset red, produces a violet
hue. The purple color is often preceded by a yellow arch hugging the
horizon. As the sun sets, violet beams emerge from the yellow,
overlapping to fill the western sky with a soft purple glow.
High-quality pictures of the phenomenon often show horizontal bands
cross-crossing the yellow arch. These bands are the volcanic gas.

Sky watchers shouldn’t expect to see purple every night. The volcanic
gas appears to be patchily distributed, bringing strange sunsets on
some nights, not all. Clear air, lack of clouds, and country settings
improves their visibility.

Sunset from Saturday evening 8/31/19
click to enlarge

(THIS PHOTO WAS NOT EDITED, ALL NATURAL COLORS)

ON TWITTER! OR FOR LOCAL WEATHER [Click Here]
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MrOwl
Sun Sep 01 2019, 06:25AM

Registered Member #13568
Joined: Sun Oct 23 2016, 01:54PM
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Posts: 1554
Very interesting

----------------------------
Meridian Idaho Weather

[Click Here]

McCall Idaho Weather

[Click Here]
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Around The Lake
Sun Sep 01 2019, 01:58PM

There is no such thing as a nobody as everyone touches someone's life
Registered Member #16
Joined: Mon Sep 25 2006, 10:38PM
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Posts: 4238
Thank you for for the amazing information

Todd C
A Smile Goes A Long Way To Making Somebodys Day Great
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Muni_Captain
Sun Sep 01 2019, 02:43PM

Registered Member #8461
Joined: Sat Jul 20 2013, 01:27PM
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Posts: 18
Thanks so much Ben! I had noticed the purple nights as well and wondered what caused them. The next question is, will it cause any changes in weather - cooling, increased albedo?

Muni_Captain
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bluemeadow
Sun Sep 01 2019, 03:43PM
Registered Member #667
Joined: Sat Sep 15 2007, 02:12PM
:
Posts: 1
Thanks i too had noticed the purple - i was thinking of the "purple mountains majesty" but this makes much more sense. And perhaps the folks that wrote those lyrics were seeing the mountains through a purple haze like that. Apologies to Jimi Hendrix!
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©ammy ⭐
Fri Sep 06 2019, 09:09PM


Joined: Sat Aug 19 2006, 06:01PM
:
Posts: 13127
Here's another article with some more details: [Click Here]
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Cap'n Crunch
Sat Sep 07 2019, 08:54AM

Registered Member #12800
Joined: Tue Jan 05 2016, 09:02PM
:
Posts: 326

Ben,

Your photo example looks remarkably like some old photos I was just going through. They were from a backpacking trip in the Sierras in the 70s and the colors had morphed such that the skies have the same purple hue as your pic. Fortunately, someone invented Photoshop and now I can return the shots to a semblance of their original colors.

Tim (KE6PMA)
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