Tioga and Glacier Point Roads Plowing Update
Glacier Point is open!
Tioga Pass is not open, but plows have reached a key avalanche slope near Olmstead Point which typically requires a lot of work. There's a chance that Tioga pass could open in time for our visit.

That would really shorten my drive to the Valley. I may head down to Tioga Pass at some point in the next week to see how much snow is up there.
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Sounds cool - although it would make my drive home much longer :)
Wow! That would be early for Tioga Pass. Do they open the road up to the point that the plowing is completed, or is it closed until the whole road is open?
+Joe Azure Having Glacier Point open offers another place for sunrise and sunset shots... bring Winter clothing for that one!
Tioga Pass would add Olmstead Point, Tuolumne Meadows and Tenaya Lake, Tioga Lake, Ellery Lake, plus a few short hikes.
+Jeff Brooks-Manas Until the pass opens, the road is opened on the Tioga Pass side up to the closed park gate at Tioga Pass, but not intl the park. Park employees enter the park to start to prepare facilities to open, and maintenance is performed on the road while it's closed: clearing fallen trees, clearing floods due to clogged culverts, pavement patching if the temperatures are high enough, etc.

Historic dates for Tioga Pass opening and closing are posted at this site: http://www.monobasinresearch.org/data/tiogapass.htm
You can see the trend toward shorter winters in the decade to decade dates. This season's January close was the latest close ever.

In the SIerra Nevada, these changes have also been measured at Lake Tahoe:

The local trends are consistent with the global ones. The discovery of CO2 as a greenhouse gas occurred in 1859 and the observation that mankind's emissions could affect global temperatures was mentioned by Arrhenius and Chamberlain in 1896:
_"Arrhenius made a calculation for doubling the CO2 in the atmosphere, and estimated it would raise the Earth's temperature some 5-6°C (averaged over all zones of latitude).(3)
Arrhenius did not see that as a problem. He figured that if industry continued to burn fuel at the current (1896) rate, it would take perhaps three thousand years for the CO2 level to rise so high. Högbom doubted it would ever rise that much."_
The Carbon Dioxide Greenhouse Effecthttp://www.aip.org/history/climate/co2.htm

Those early estimates for future CO2 did not take into account technology advances such as the adoption of the internal combustion engine, and around 1900 no one was anticipating this growth of the world's population beyond 7 billion:

Even today, people only forecast the 2045 population at only 9 billion (as if some drastic change to the population growth trends and tapering off will occur), and portray the problems as being not enough development in some segments of the population:

It's enlightening to review the history of the findings of science on the subject from 1900 - 2008 or so, as summarized by the American Institute of Physics:
One of the AIP's member societies, the American Geophysical Unuion, issued a revised and stronger tstatement in 2008:
AGU Releases New Statement Addressing Human Impacts on Climate
Scientists representing the American Geophysical Union released a new statement on climate change on January 24th, that says, “Earth’s climate is now clearly out of balance and is warming.” The statement, an update of the AGU’s 2003 climate change position statement, says that when the scientific data related to warming is studied, “the human footprint on Earth is apparent.” In releasing Human Impacts on Climate Change, the organization’s strongest statement to date on the impact of global warming, AGU president Timothy Killeen said, “the changes we’re seeing are best explained by greenhouse gas emissions and aerosol loading in the atmosphere caused by human activity.”

The statement says that “as of 2006, eleven of the previous twelve years were warmer than any others since 1850 [when official weather record-keeping began in the U.S.].” The statement, approved unanimously in December by the Council of AGU, goes on to say that, “Many components of the climate system - including the temperatures of the atmosphere, land and ocean, the extent of sea ice and mountain glaciers, the sea level, the distribution of precipitation, and the length of seasons - are now changing at rates and in patterns that are not natural and are best explained [by the increase in greenhouse gas emissions] generated by human activity during the 20th Century.”

Science invites challenges and revisions to theories, but absent from science is the active debate on the warming trend or mankind's role, as often portrayed by the media. The Nieman Foundation for Journalism at Harvard University looked at that blatant mismatch between reality and what was reported to the public, and came up with the following reports:


Disinformation, Financial Pressures, and Misplaced Balance
A reporter describes the systemic forces that work against the story of climate change being accurately told.
By Ross Gelbspan

Global Warming: What’s Known vs. What’s Told
‘Americans could be forgiven for not knowing how uncontroversial this issue is among the vast majority of scientists.’
By Sandy Tolan and Alexandra Berzon

Knowing Uncertainty for What It Is
In reporting on the science of global warming, journalists contend with powerful, well-funded forces using strategies created by tobacco companies.
By David Michaels

I'm definitely going to spend more time in Yosemite Valley in the near future capturing snow shots, as they're going to be historic relics a few short decades from now.
Unfortunately I will not be attending... I will be hiking Cactus-to-Clouds trail in Palm Springs on May 5. It is a very hard hike due to the heat & cold diversity on the trail, and it is the only appropriate time... I also won a lottery to hike Half Dome on June 7!
Oh no, sorry you won't make it +Elena Omelchenko :(

but YES! to Glacier Pt Road being open!! I'll have to cloud watch and maybe head up for sunset. It looks about 0 visibility now. :(
April 27, 2012: "*Tioga Road:* The Tioga Road has been plowed, but much work remains, including significant road repairs and rock removal, along with plowing of parking lots, side roads, and clearing of ditches. The Tioga Road opens to bicycles (but not vehicles) on Saturday, April 28. There is no estimate when the Tioga Road may open to vehicles.

_The Glacier Point Road opened for the season on April 20, 2012 at 5 pm._"
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