Posted on February 24, 2014 by Bob Berwyn
Widespread western drought continues
Much of the West has been very dry during the first four months of the 2014 water year.
By Summit Voice
As California experiences its worst drought in more than a century, it’s probably not surprising that some stream gages in the northern part of the state are showing all-time record low readings, with 2013 in the record books as the driest calendar year in the state’s 119-year recorded history.
Low streamflow affects water availability for agricultural, municipal, and industrial uses, water quality, water temperature, recreational opportunities, and the maintenance of fish populations.
Recent precipitation has resulted in some increases in streamflow, snowpack, and reservoir levels, but severe drought conditions remain. Without significant additional precipitation, prior conditions will quickly return leaving most streams in the state at less than 10 percent of normal for this time of year. Continue reading
Filed under: climate and weather, Drought, Environment, rivers, water | Tagged: California drought, climate, Colorado River, drought, Lake Powell, rivers | 2 Comments »
Posted on January 30, 2014 by Bob Berwyn
‘What we are seeing now is fundamentally different from previous mega-droughts, which were driven largely by precipitation’
Global warming is likely to exacerbate droughts worldwide.
By Summit Voice
FRISCO — While drought conditions have eased across parts of the U.S. in recent months, conditions have worsened in the far West, and particularly in California, where water shortages will have consequences spreading far beyond the state’s borders.
And the western drought has global warming fingerprints all over, according to four researchers who discussed the links between climate change and drought at a teleconference organized by Climate Nexus, a communications group focused on highlighting the wide-ranging impacts of climate change. Continue reading
Filed under: agriculture, climate and weather, Drought, Environment, extreme weather, global warming | Tagged: California drought, drought, Environment, extreme weather, global warming | 2 Comments »
Posted on December 14, 2013 by Bob Berwyn
NRCS snow surveys help water managers plan ahead.
Temporary budget fix ensures program through August 2014
By Bob Berwyn
FRISCO — For decades, hydrologists have been tromping through the high country of Colorado and around the West to make detailed snowpack measurements. Together with data from automated SNOTEL sites and other tools, the monthly snow-course readings help water managers develop accurate projections of spring stream flows, and how much water will be available for irrigation and storage.
The information is critical in arid regions, which rely on the winter snowpack as the ultimate reservoir. Federal budget cuts have threatened the program, raising concern among western resource managers, but the U.S. Department of Agriculture announced this week that it has found a way to maintain funding for the Snow Survey and Water Supply Forecasting Program — at least through the end of Aug. 2014. Continue reading
Filed under: climate and weather, Colorado, Snow and weather, Summit County snow and weather | Tagged: climate, Colorado, drought, Natural Resources Conservation Service, rivers, SNOTEL, snow surveys, weather | 2 Comments »
Posted on November 22, 2013 by Bob Berwyn
NOAA’s winter outlook offers little relief for Arizona, New Mexico
By Bob Berwyn
FRISCO — Drought conditions may persist across the southwestern U.S. this winter and may redevelop across the Southeast, according to the seasonal outlook from NOAA’s Climate Prediction Center.
“Even though we don’t have La Niña, the atmosphere across the Pacific seems to be stuck in a La Niña mode … It’s been quite surprising to us, how persistent the pattern is,” said Mike Halpert, acting director of the Climate Prediction Center.
Parts of the Southwest, especially New Mexico, have been experiencing one of the driest periods on record, and Halpert said there is “decent agreement” in the CPC’s models on the climate signal that has resulted in the persistent trend. Continue reading
Filed under: climate and weather, Drought, El Niño, La Niña | Tagged: climate, Climate Prediction Center, drought, El Nino, ENSO, La Niña, Southwest, winter weather outlook | 2 Comments »
Posted on November 16, 2013 by Bob Berwyn
2013 brought record levels of dust to Colorado’s mountains
More frequent desert dust storms dropping pollution on the Rocky Mountain snowpack is one of the climate change impacts affecting the Colorado high country.
By Bob Berwyn
FRISCO — Dust storms that darken the Rocky Mountain snowpack and speed snowmelt are becoming more extreme, according to new research. Particularly heavy dust-on-snow events can speed the melt-out of the snowpack by a full six weeks, all other factors being equal, said Jeffrey Deems, a researcher with the Western Water Assessment and the National Snow and Ice Data Center.
“In 2006 we were impressed at how much dust there was. Then 2009 turned up, and 2010, and 2013 was the dustiest year we’ve recorded in the San Juans,” Deems said, explaining that the latest study, put together by researchers with NOAA’s Cooperative Institute for Research in Environmental Sciences was aimed at updating previous work with data from those heavy dust years.
Last spring, on April 8, a single 16-hour dust storm dropped more dust on the San Juans than the annual totals in any previous winter since scientists started taking detailed measurements, said Chris Landry, director of the Center for Snow and Avalanche Studies in Silverton, which tracks the dust-on-snow events via a network of observation sites. Continue reading
Filed under: climate and weather, Colorado, Drought, snow | Tagged: Colorado, Colorado River Basin, drought, dust on snow, Environment, global warming, water | 1 Comment »
Posted on November 15, 2013 by Bob Berwyn
California’s redwood forests recycle ocean fog to create their own microclimate. bberwyn photo.
Amazon rainforest may be more resilient than previously believed
By Summit Voice
FRISCO — As one of the Earth’s big lungs, the fate of the Amazon rainforest in the face of global warming is a critical climate question. New research suggests that, with strong conservation measures in place, the rainforest may be more able to cope with dry conditions than projected by other studies.
Many climate models over-predict the water stress plants feel during the dry season because they don’t take into account the moisture that the forest itself can recycle in times of drought. In this study, published in the Journal of Climate, the researchers removed unrealistic water stress from their model and found that the moisture that is recycled by the forest is sufficient to reduce the intensity of drought conditions. Continue reading
Filed under: climate and weather, Drought, Environment, forests | Tagged: Amazon Rainforest, climate, drought, forests | Leave a comment »
Posted on November 8, 2013 by Bob Berwyn
Shifts in precipitation patterns would have big consequences for agriculture, forests and municipal water supplies
Research suggests that deforestation will likely produce a weather cycle over the Amazon consisting of abnormally dry air in the sun-scorched northern Amazon around the equator weighted by wetter air in the cooler south (left). The Princeton-led researchers found that the Amazon pattern would be subject to meandering high-altitude winds known as Rossby waves that move east or west across the planet (center). The Rossby waves would move the dry end of the Amazon pattern directly over the western United States from December to February, while the pattern’s rainy portion would be over the Pacific Ocean south of Mexico (right). Image courtesy Princeton University.
By Summit Voice
FRISCO — Continued deforestation in the Amazon region could have significant impacts on the weather in North America, according to Princeton researchers, who used fine-grained climate models to simulate how precipitation patterns could shift in the future.
Their findings suggest that total deforestation of the Amazon may significantly reduce rain and snowfall in the western United States — specifically, 20 percent less rain for the coastal Northwest and a 50 percent reduction in the Sierra Nevada snowpack, a crucial source of water for cities and farms in California.
“The big point is that Amazon deforestation will not only affect the Amazon — it will not be contained. It will hit the atmosphere and the atmosphere will carry those responses,” said lead author David Medvigy, an assistant professor of geosciences at Princeton. Continue reading
Filed under: climate and weather, Drought, El Niño, Snow and weather | Tagged: Amazon Rainforest, climate, drought, El Nino, western U.S. | 1 Comment »
Posted on November 3, 2013 by Bob Berwyn
High flow experiment planned for early November to restore aquatic and riparian Colorado River ecosystems downstream of Glen Canyon Dam
By Summit Voice
FRISCO — Even with some bonus inflow in September, the past water year Oct 1, 2012 – Sept. 30, 2013) ended up as the fourth-driest on record for the Colorado River Basin as measured at Lake Powell — the key reservoir on the river that helps balance supply and demand between the upper and lower basins.
Overall water storage in the Colorado River Basin in the last 14 years has ranged from a high of 94 percent of capacity in 2000 to the present low of 50 percent at the start of the 2014 water year.
Filed under: climate and weather, Colorado, Colorado River, Drought, Environment, global warming, rivers, water | Tagged: climate change, Colorado River, drought, Lake Powell, water storage | 1 Comment »
Posted on October 17, 2013 by Bob Berwyn
‘This is not about ducks and daisies, but the very basis of life’
By Summit Voice
FRISCO — As many as 500 million people could face water shortages in the coming decades, as a warming climate affects global water supplies.
“We managed to quantify a number of crucial impacts of climate change on the global land area,” said Dieter Gerten, of the Potsdam Institute for Climate Impact Research.
Mean global warming of 2 degrees Celsius, the target set by the international community, is projected to expose an additional 8 percent of humankind to new or increased water scarcity. If global temperatures increase by 3.5 degrees Celsius, shortages would affect 11 percent of the world population. Continue reading
Filed under: agriculture, climate and weather, Environment, global warming, water | Tagged: climate, drought, Environment, global warming, water | Leave a comment »
Posted on August 17, 2013 by Bob Berwyn
Climate experts outline weather extremes across the U.S.
By Bob Berwyn
After years of persistent drought across big swaths of contiguous 48 states, the weather picture changed dramatically in 2012. Instead of dealing with parched ground, farmers in the Southeast weren’t able to harvest crops this summer because of standing water in the fields.
Mold and fungal diseases were reported across the region, particularly on crops such as corn, tomatoes and peanuts. The excess moisture has degraded the quality and flavor of many crops, including watermelons, tobacco, and peaches. Flooded soil has hampered the growth of cotton and corn, with damage from excess moisture expected to cost billions, The National Climatic Data Center reported this week in its July update. Continue reading
Filed under: climate and weather, Drought, flooding, seasons | Tagged: climate, drought, extreme weather, flooding, National Climatic Data Center, National Oceanic and Atmospheric Administration | 1 Comment »