![]() I downloaded the data for both of the sites (back to 1998 at TNY and 1980 at DAN) and the opening dates for the two roads and put them into an Excel Spreadsheet. For both of these sites I used the "SNOW, WATER CONTENT(REVISED)" data. On the station page will be a table describing the location of the station and below this a table describing the data available. To get to the DAN button, click "EAST" and it will be on the right side of the map. If you follow these instructions, TNY should be on the far right side of the map. To get to either of these Tioga Pass Road sites (other than the links provided), click on the CDEC link provided above, click on "Station Locator" on the left-side bar, click near the "25" (north of Fresno) on the "Northern California" map (left one), click on the Tioga Pass Road in the upper-center portion of the map (within the green shaded area), and click on the station button (red). Unfortunately, there are no real-time snow water equivalence data available near Glacier Point. The two CDEC data sites that I will look at are Tenaya Lake (TNY) and Dana Meadows (DAN) because these report real-time snow water equivalence (SWE) and they are located very near the Tioga Pass Road. For the purpose of predicting the opening date for the two Yosemite roads, I will only use the CDEC website here because the closest WRCC site is along the Virginia Lakes Ridge south of Bridgeport, CA. The two sites that I use that report snow amounts/depths are the Calfornia Data Exchange Center (CDEC) and the Western Regional Climate Center (WRCC). Now, what information is out there that would allow someone to predict the opening date for a particular road in a particular year? The most important factor is amount or depth of snow followed by temperature. The Mono Basin Research page shows the Tioga Pass opening and closing dates since 1933. The National Park Service page shows the Tioga Pass opening and closing dates since 1980 and the Glacier Point opening and closing dates since 1995. There are two sites that I've found with this information-the National Park Service page and the Mono Basin Research page. Probably the most important information is the dates that these roads opened in the past. There are many sources of information online to use to make an educated guess on the date that the Tioga Pass Road and Glacier Point Road will open in Yosemite National Park. Since the plowing on Tioga Pass and Glacier Point Roads was scheduled to begin this week, I thought I'd post a blog about expected opening dates. ![]()
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