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Yosemite Nature Notes - 8 - Snow Line

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[Music]
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Wet weather to return to the Central California
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Interior by this weekend.
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A pair of Pacific weather systems will arrive
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late this week.
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The first will move into Central California Thursday night,
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with periods of rain developing,
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continuing into Friday.
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A typical winter pattern in California is that
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we'll see anywhere from four to seven major storms,
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that's a typical winter weather pattern.
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You know, we've been under a ridge of high pressure here
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for the past, you know, few days and it has been warm
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and almost borderline spring like conditions.
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And so now the cold air is reloading out
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over the Eastern Pacific
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and it's going to bring another big system,
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so we'll see temperatures coming back down
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and snow levels dropping.
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If you're going to be out there Friday,
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you're going to be getting wet.
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Now, the question is, is it going to be rain
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or is it going to be snow?
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So we come back over here and we take a look
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and it says here around 4,800 feet,
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we're expecting snow, for points 4,800 feet and above,
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we're expecting snow.
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So here we are standing at the boundary
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of Yosemite National Park.
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We've got the Merced River flowing down here next to us,
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and on the other side, Highway 140,
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and up the road is the Arch Rock Entrance Station.
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We've got some rain, it's the beginning of a big storm,
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it's supposed to rain and snow all day,
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and we've got a temperature of 46 degrees
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and we are here at 2,126 feet.
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We've got a benchmark nearby that verifies that.
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So we're going to head up the road
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and see where we can find rain turning to snow.
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In some strict term, snow line is actually
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the elevation at which snow stays year round.
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And then you have a seasonal snow line
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and that's the line at which
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snow can be expected to be in the wintertime.
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And then you have the snow line
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that can happen in a certain storm,
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which is extremely variable over time
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and space in each individual storm,
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that transition is what we are chasing.
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We're trying to find out, in this storm,
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