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  1. #1
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    Sierra Cascades' prevailing wind patterns

    Other than mostly from the west, which direction are the prevailing winds along the Sierra Cascades Bike route? I cant find much info that is helpful in determining whether to start in the north or south this summer...

    Oh, and I'll be doing this in mid June to early July.
    Yosemite is about as far south as Id like to be. Canada is my northern destination.

    Thanks for all your help!

  2. #2
    Senior Member simplygib's Avatar
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    Pick a few cities along your route and look up the historical data on weatherspark.com for the dates you'll be passing through. Weatherspark will give you probabilities of various weather conditions based on decades of data.

    Start here, type city in the field at top of page, click search.

  3. #3
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    This is an awesome website! But their wording is a little strange..
    I checked some central towns in oregon and washington like Olympia and Ashland. The page told me that the winds are out of the North which I would assume that means the wind moves from north to south (just like on the coast). Then I checked some coastal towns and the page said that the wind moves out of the south.. WTF does this language mean! Eniglish is so strange..

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    Usually in the summer, winds blow toward the crest of the ranges--this is when under the usual high pressure dome. In the Mono-Lakes/Mammoth Area on the east side of the Sierra, both times I've been there in the summer there have been nasty SE winds, possibly due to the monsoon flow at the time. Otherwise in the Sierra when I've been there, the winds really aren't much of a factor, trees cut them way down and the terrain is more a determinant---OK, I remember some nice westerly tailwinds heading from Mt. Lassen to Lake Almanor every time I've done that route, so count on some light to moderate westerlies in the valleys.

  5. #5
    Senior Member simplygib's Avatar
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    Quote Originally Posted by ramseykp View Post
    This is an awesome website! But their wording is a little strange..
    I checked some central towns in oregon and washington like Olympia and Ashland. The page told me that the winds are out of the North which I would assume that means the wind moves from north to south (just like on the coast). Then I checked some coastal towns and the page said that the wind moves out of the south.. WTF does this language mean! Eniglish is so strange..
    Wind direction is always described as the direction it is coming from. A North wind means it blows from North to South. A Southwest wind blows from Southwest to Northeast. On the Oregon coast, the wind does sometimes blow South to North. It's more common than some might think. the North to South flow is mostly a summer phenomenon, unless a storm blows through which often disrupts the pattern.

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    This is an interesting realtime representation of current US wind flow: http://hint.fm/wind/

  7. #7
    Junior Member SLObike's Avatar
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    The only memorable headwind that I recall was riding south toward Mt Shasta from Ashland in the afternoon. My understanding is that it's a fairly common occurance. It made for a long, hard day as my panniers acted as a parachute. Otherwise I'd say that the prevailing wind was from the north or northwest and not real noticeable. The forest helps.

  8. #8
    Senior Member simplygib's Avatar
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    Quote Originally Posted by SLObike View Post
    The only memorable headwind that I recall was riding south toward Mt Shasta from Ashland in the afternoon. My understanding is that it's a fairly common occurance. It made for a long, hard day as my panniers acted as a parachute. Otherwise I'd say that the prevailing wind was from the north or northwest and not real noticeable. The forest helps.
    Just curious - what route did you take between Ashland and Mt. Shasta?

  9. #9
    Junior Member SLObike's Avatar
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    I just followed the Adventure Cyclist S.C. route (don't have the map in front of me). The county road(s) roughly parallels Interstate 5. Could give more detail later if you'd like.

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