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<p class="MsoNormal">To layer on to and supplement Joe’s response, I think another neat factoid to consider is that while the TMY protocol generally does not exclude any specific months on the merits of “extreme” weather/climate events (which is good and rigorous
from a statistical viewpoint), there were two historical volcanic events that have caused specific periods to be excluded from files in the NREL TMY3 set: The eruptions of El Chichón, Mexico in 1982 and Mt. Pinatubo, Philippines in 1991.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">These events had substantial effects in reducing solar radiation measured in the United States due to aerosols pushed into the atmosphere, and as a result there are a net of ~6 years pulled out of the historical record to exclude periods
following those events, for the purpose of establishing the months of data considered for the TMY “pools.”<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">A fun (?) takeaway is that when the next major volcanic event occurs, we as a community are going to have a lot to talk about in considering the merits and application of the established TMY protocol against some other approach to incorporate
the weather measurements on record for those excluded periods!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469"> Schneider Electric</span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">D </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6361
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</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">M </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">785.410.3317
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</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">F </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">913.564.6380</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#57B069">E </span><span style="color:#1F497D"><a href="mailto:nicholas.caton@schneider-electric.com"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">nicholas.caton@schneider-electric.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" align="right" style="text-align:right"><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#626469">15200 Santa Fe Trail Drive<br>
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<p class="MsoNormal"><b>From:</b> Bldg-sim <bldg-sim-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Joe Huang via Bldg-sim<br>
<b>Sent:</b> Sunday, September 16, 2018 12:20 PM<br>
<b>To:</b> Linda Lawrie <linda@fortlawrie.com><br>
<b>Cc:</b> bldg-sim@onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Tracking Hurricane Florence through the Wilmington weather file<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="color:red">[External email: Use caution with links and attachments]</span><o:p></o:p></p>
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<p class="MsoNormal">Larry, Linda, others,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Average daily wind speed has always been one of the parameters used to select "typical months" in the TMY methodology used by NREL that others like me have followed to create the IWEC2s, etc. Its weight, however, is low compared to the
cumulative weights for temperature (average, max, min dry-bulb), humidity (average, max, min dewpoint), and solar ( average global horizontal and sometimes also direct normal irradiance). The other thing to consider is that the TMY methodology does not exclude
any month due to outliers, but looks at the difference in the cumulative distribution of these daily parameters to the long-term distribution, and picks that month with the best correspondence of CFDs. Thus, it is possible that a month with an extreme event
might still be selected, but the fact that a hurricane affects all 8 or 9 parameters and can extend over several days makes it unlikely. On the other hand, if the statistics were to pick a month with a hurricane, is that really a problem? One of the things
I like about the TMY methodology is that it aims to pick a month with the most representative distribution of conditions, not the blandest month with no peaks and valleys.<o:p></o:p></p>
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<p class="MsoNormal"><br>
Sent from my iPad<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
On Sep 16, 2018, at 7:52 AM, Linda Lawrie via Bldg-sim <<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt">Larry,<br>
<br>
Wind Speed is not usually one of the items for selection of TMYs but one would hope that other factors might disregard those events/months.<br>
<br>
Linda</span><o:p></o:p></p>
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