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<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>Hi
all,</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>I've been approached
by a meteorologist who is looking at trying to link wind speeds to thresholds,
or a range of thresholds, where tree damage is commonly seen. I passed on
a good review article by Dr. Kim Coder on the subject, <SPAN
class=063213121-23012008><FONT face=Arial color=#0000ff size=2><A
href="http://www.urbanforestrysouth.org/resources/library/storm-wind-loads-on-trees/at_download/file_name">http://www.urbanforestrysouth.org/resources/library/storm-wind-loads-on-trees/at_download/file_name</A></FONT></SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>but he's also
looking for input from other foresters or arborists.</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>If you have some
observations or data on the subject, please pass them on to me, and I will
forward them. Below is some more information on what he is looking
for.</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>thanks,
</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>Ian
Wilson</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial size=2>City of
Kelowna</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2>--------------------------------------------------------------</FONT></SPAN></DIV>
<DIV><SPAN class=968593721-28012008><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=968593721-28012008><SPAN lang=en-us><FONT face=Arial
size=2> Currently I am working on a project that is
trying to link impacts to wind speeds. Specifically the Meteorological Service
of Canada is trying to come up with some impact statements to go along
with the meteorological numbers that we use in our worded forecasts and
warnings. This recognizes that fact that forecasts that give the wind speed in
km/h are not easily translated by members of the public into the impacts that
the wind may have. Since wind has a big impact on the City of Kelowna
Parks dept' I wonder if you could help us out by letting us know that the
impacts are for various wind speeds. What type of damage would you
associate with a</FONT><FONT face=Arial color=#0000ff size=2></FONT> <FONT
face=Arial size=2>50-70 km/h wind, a 70-80 km/h/ wind, a 90-100 km/h wind and
winds greater than 100 km/h (gusts included). Do you have any sense of this or
have you ever tried to quantify it? Perhaps you have an idea based on the
number of crews that have to be called in to clear fallen trees and
debris. Perhaps it is not just wind speed that is important, but
considerations such as wind direction, how wet it has been, whether trees are in
leaf or not etc.</FONT></SPAN>
<P><SPAN lang=en-us><FONT face=Arial size=2> To use an example
we have heard from municipal parks people that tree branches start to break off
with winds gusting to 70 km/h. The storm of November 12th 2007 produced
wind of 90 km/h in Penticton uprooting mature trees and causing widespread power
outages and the evacuation of some neighbourhoods. Any information that you have
along on the impacts that certain speeds of wind have would be greatly
appreciated.</FONT></SPAN></P>
<P><SPAN lang=en-us><FONT face=Arial size=2> If you have any questions or
please do not hesitate to give me a call.</FONT></SPAN> </P><BR>
<P><SPAN lang=en-ca><B><FONT face=Arial color=#000080>Gabor
Fricska</FONT></B></SPAN> <BR><SPAN lang=en-ca><FONT face=Arial color=#000080
size=2>Sector Development Meteorologist</FONT></SPAN> <BR><SPAN lang=en-ca><FONT
face=Arial color=#000080 size=2>Environment Canada</FONT></SPAN> <BR><SPAN
lang=en-ca><FONT face=Arial color=#000080 size=2>National Services Office -
Natural Resources</FONT></SPAN> </P>
<P><SPAN lang=en-us><FONT face=Arial color=#000080>3140 University
Way</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial color=#000080>Kelowna
BC</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial color=#000080>Tel
(250) 491-1517</FONT></SPAN> <BR><SPAN lang=en-us><FONT face=Arial
color=#000080>Fax (250) 491-1506</FONT></SPAN><SPAN lang=en-ca></SPAN>
</P></SPAN></DIV></BODY></HTML>