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On May 7, 1941, part of the north-west face of Wright Mountain, an 8,500 foot mountain towering high above the town of Wrightwood, California catastrophically fails. This mass wasting event was part of a geological process beginning at least as early as the 1500s, fueled by changes in climate and tectonic forces, which is still active and ongoing to this day. The temperatures were anomalously above average for May 1941, following a winter of heavy snow. The melting snow triggered a major landslide.The landslide sent over 1,000,000 cubic yards of a "slimy gray concrete-like" mud down the side of the mountain through Heath Canyon. The debris flowed up to 15 feet per second at surge fronts, with fluid samples indicating a water content of 25-30%

 Havoc in Heath Canyon 

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Continue storytelling with ArcGIS StoryMaps and keep your content. Request that Esri migrate your account to ArcGIS Online by May 31, 2025, and complete migration by June 30, 2025.

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After one year, you will need to purchase an ArcGIS Online subscription to continue using ArcGIS StoryMaps. Check out the StoryMaps <link>retirement page</link> for more information on the ArcGIS Online subscription options.

ArcGIS <link>StoryMaps</link> is the professional version of StoryMaps and is available as part of <link2>ArcGIS Online</link2>. Both products share similar storytelling capabilities, so if you are familiar with StoryMaps, you'll feel right at home with ArcGIS StoryMaps. Visit the <link3>retirement page</link3> for a detailed comparison between StoryMaps and ArcGIS StoryMaps.

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Both of these options include access to ArcGIS StoryMaps and the other ArcGIS Online apps and capabilities. Please note that there is a price difference between the two options that you will need to pay if you want to keep your account active when your free subscription expires. See the FAQs on the <link>StoryMaps.com retirement page</link> for more information about these subscription options.

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