Johnstown flood - PowerPoint PPT Presentation

Tornadoes

Tornadoes. Chapter 3 Section 2B Pages 85-88. Tornadoes. A rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud and touches Earth’s surface Usually are on the ground for 15 min or less May be a few hundred meters across Wind speeds approach 480km/hr ( 300mph ) .

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The Johnstown Flood of 1889

The Johnstown Flood of 1889 . Zach Hummer History 100 Tuesday &amp; Thursday, 11 am December 10, 2009. Johnstown Area, circa 1889. Johnstown Population: 10,000 people Population of surrounding area: 15,000 to 20,000 people. Conemaugh Lake Reservoir: 70 feet Deep 450 Acres

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