Climate Regional | Local | Desirability | Physicality | Code & Sensitivity

Predominant Winds

Having overlaid the months into their respective seasons,theannualtrendforwindsonthesitereflects calmer winters, ramping up in the spring, higher turbulence in the summer, and a winding down in the fall. While varying in speed, spring and summer months have similar directional tendencies blowing predominantly from the west and northwest-west. Because summer months tend to have the highest volume of lake use and lake activities, it is worth noting that winds from the east and east-southeast are nearly as common from the predominant west and west-northwest but not in strength.

Fall and winter resemble a similar directional wind relationship, just as spring and summer directions relate. Predominant blowing in fall and winter come from the east-southeast direction. Interestingly, the winter months show stronger winds than in the fall season, but much less often, it is considered calm nearly 30% of the time (thank goodness because it is cold enough without the wind factor!)

Data from Western Regional Climate Center.

Wind Behavior On-site

As described from the wind rose graphics on the previous page, Spring and Summer are the most active months for air movement on Lake Chelan. Lakeside Park and the neighborhood to the west of the site extend deeper into the lake than the three fingers, providing light protection from gusts down lake. The site is not completely protected from the predominant WNW winds in the summer months; the project’s outdoor spaces will benefit from some neighborhoodtreesandvegetationbeforearrivingat the site. Eastern winds have quite the arduous journey along the base of the butte and neighborhood trees; concern for wind becoming pesky from this direction is minimal. During the Fall and Winter, the wind is not as aggressive and mainly flows from the ESE. Again, it has some work to do while navigating around the butte before affecting the site. The freezing temperatures during these colder months will make

Geographic Context

Chelan Butte

Columbia River

Palette 2030 Design Recommendations

Climate-specific design recommendations produced from Climate Consultant software.

Glazing

»»

»»

Glazing to Floor Ratio 20% for cold climates (winter temps 20ºF - 30º F) and between 44º – 56º latitude

Orient solar glazing within 15º of true south in the Northern Hemisphere, and no more than 25º from either orientation.

Materiality

»»

West | North | East Oriented Glazing: Double pane high performance glazing (Low-E)

»»

South Oriented Glazing: clear when designed for maximum passive solar gain

»»

Consider Tiles | Slate | and Wood as flooring surfaces to provide enough mass to store winter daytime solar gains and summer evening ‘coolth’

Insulation

Take advantage of the heat gain from lights/occupants/equipment keep that building tight and well-insulated to maintain a lower Balance Point Temperature.

»»

»» Pitched roofs, vented to the exterior & well-insulated ceiling below (shed the rain/snow and avoid ice dams)