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International Society of Arboriculture
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International Society of Arboriculture
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Event Details

Why Trees Fail – The Physics of Windstorm Tree Failure

Date: April 17, 2019
Location: Atwood Conference Center, Rooms 102 and 104 , Anchorage, Alaska, UNITED STATES
Organizer: Pacific Northwest Chapter of ISA
Sponsor: Pacific Northwest Chapter of ISA
Description: This workshop provides a solid foundation for arborists of all skill and experience levels to aid in assessing why trees fail in storm events and improves their ability to assess risk.

There has been a proliferation of tree anchorage and tree biomechanics research in the last decade. Understanding why trees fail involves application of this recent research in order to discard outdated beliefs, generalizations, anecdotes, and industry myths and misinformation. Tree, root, and crown attributes, loads, weather, and tree biomechanics will be discussed in relation to wind storms.

The workshop and discussion will review, synthesize and integrate several research findings to try to understand how and why some trees fail, some do not, and some break along the trunk, while others uproot.

Location: Atwood Conference Center, Rooms 102 and 104, 550 West Seventh Ave, Anchorage, AK 99501

1:15pm – 2:45pm
Root strength, architecture and tree anchorage
Tree failure patterns
Weather impacts
2:45pm – 3:00pm, Break
Tree biomechanics
Arboriculture practices and structural defects


Jim Flott is president of Community Forestry Consultants, Inc. (CFC). CFC provides TreeWorks™ tree management software; inventories and appraisals; management plans; risk assessment and risk management plans; tree preservation plans; diagnosis; expert witness; forensic investigations; urban forestry program reviews; training workshops; and urban forestry, arboriculture, and horticulture consulting services to individuals, corporations, universities, municipalities, county and state agencies, cemeteries, and golf courses in the United States and Canada. He received his B.S. degree in horticulture from Iowa State University and his M.S. degree in forest pathology from the University of Arizona and has over 40 years work experience in the horticulture, urban forestry and arboriculture industries. He is an ISA certified arborist and certified municipal specialist; American Society of Consulting Arborists registered consulting arborist; PNW-ISA TRACE instructor and certified tree risk assessor; and ISA TRAQ instructor and assessor
Contact Name: Margo Thorp
Contact Phone: 8003354391
Contact FAX: 5038741509
Contact Email:

Seats Available: 38
CEUs available: Yes

Start Date: 1:15 PM, April 17, 2019
End Date: 5:00 PM, April 17, 2019

Address: Atwood Conference Center, Rooms 102 and 104
550 West Seventh Ave
108 Events