Posted on May 4, 2014 by Bob Berwyn
Old Douglas firs can help reveal historic climate cycles.
Recent dry spells not so bad compared to past centuries
FRISCO — A tree-ring reconstruction of Utah’s climate going back to 1429 shows that the state has experienced several mega-droughts in past centuries that would be life-changing if they happen again, according to Brigham Young University professor Matthew Bekker.
The worst drought of the modern era, the 1930s Dust Bowl, barely ranks on the top 10 list of droughts in that 500-year span,” Bekker said. The findings reinforce similar studies for the Colorado River Basin. Continue reading
Filed under: climate and weather, Drought | Tagged: climate, drought, megadroughts, tree rings, Utah | 2 Comments »
Posted on April 19, 2014 by Bob Berwyn
Global warming seen as key factor in trend
Study documents significant trend in size and frequency of western wildfires.
Western wildfires: How much bigger will they get?
By Summit Voice
FRISCO — The size and frequency of western wildfires have been increasing at a startling rate the past few decades, researchers said this week after scrutinizing satellite data to measure burned areas.
The number of wildfires larger than 1,000 acres increased by a rate of seven fires a year from 1984 to 2011 and the total areas burned grew by about 90,000 acres per year — an area the size of Las Vegas, according to the new study accepted for publication in Geophysical Research Letters, a journal published by the American Geophysical Union.
“We looked at the probability that increases of this magnitude could be random, and in each case it was less than one percent,” said Philip Dennison, an associate professor of geography at the University of Utah in Salt Lake City and lead author of the paper. Continue reading
Filed under: climate and weather, Drought, Environment, extreme weather, forest fires, global warming | Tagged: climate, Environment, global warming, Wildfires | 1 Comment »
Posted on April 15, 2014 by Bob Berwyn
A NASA photo taken from the International Space Station shows sunlight glinting off the Amazon River.
Drought the main driver of destructive fires
By Staff Report
FRISCO — Longer droughts, land-use changes and wildfires may be pushing parts of the Amazon rainforest toward an ecological tipping point, a team of scientists said after analyzing the effects of fire in a series of study plots.
The changes may abruptly increase tree mortality and change vegetation over large areas, the researchers said, pointing out that current Amazon forest models don’t include the impacts of wildfires. As a result, projections of future forest health tend to underestimate the amount of tree death and overestimate overall forest health, said Dr. Michael Coe, of the Woods Hole Research Center. Continue reading
Filed under: climate and weather, Drought, Environment, global warming | Tagged: Amazon Rainforest, drought, Environment, Wildfires | Leave a comment »
Posted on April 3, 2014 by Bob Berwyn
Drought is expected to expand the southwestern U.S. and other regions.
Evaporation seen as huge factor in climate calculations
FRISCO — Increasing global temperatures will drive drought expansion regardless of precipitation in some cases, as more moisture evaporates from soils.
An increase in evaporative drying means that even regions expected to get more rain, including important wheat, corn and rice belts in the western United States and southeastern China, will be at risk of drought. The study excludes Antarctica.
The new study models the effects of both changing rainfall and evaporation rates on future drought, estimating that 12 percent of land will be subject to drought by 2100 through rainfall changes alone; but the drying will spread to 30 percent of land if higher evaporation rates from the added energy and humidity in the atmosphere is considered.
Filed under: climate and weather, Drought, global warming | Tagged: climate change, drought, global warming | Leave a comment »
Posted on March 17, 2014 by Bob Berwyn
Severe drought continues in Southwest
California, Arizona and New Mexico reporting very dry conditions.
By Summit VoiceFRISCO — Snowpack across the West is still somewhat of mixed bag in this no-Niño winter, but February storms did help bolster water supplies across the northern tier of states, according to the monthly update from USDA’s Natural Resources Conservation Service.
East of the Continental Divide as well as parts of Washington, northern Oregon, northern Idaho and western Montana are now forecast to have near-normal or above normal water supplies, according to the forecast from the NRCS National Water and Climate Center. Continue reading
Filed under: climate and weather, Colorado, Drought, extreme weather, global warming, Snow and weather | Tagged: climate, drought, stream flow forecasts, The West | 1 Comment »
Posted on March 14, 2014 by Bob Berwyn
State releases draft climate change report, comments wanted
How warm will it get in Colorado?
By Summit Voice
FRISCO — Climate experts say it’s about to get warmer —probably much warmer — in Colorado. A draft state climate report released this week for public comment shows that Colorado has warmed by 2.5 degrees Fahrenheit in the past 50 years. By the middle of this century, summer temperatures will be higher than in all but the hottest years, with another 2.5 to 5.5 degrees of warming expected. Continue reading
Filed under: climate and weather, Colorado, Drought, extreme weather, global warming | Tagged: Colorado, Colorado climate change plan, global warming, runoff, snowpack | 1 Comment »
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 January 16, 2014 by Bob Berwyn
Cooler than average temperatures were widespread across the U.S. in December 2013.
California drought intensifies
By Summit Voice
FRISCO — December 2013 won’t go down in the record books for cold temperatures even though cooler-than-average readings prevailed across much of the country.
The average temperature across the lower 48 states was 2 degrees Fahrenheit below the 20th century average, making it the coldest December since 2009, according to the monthly summary released this week by NOAA’s National Climatic Data Center. Continue reading
Filed under: climate and weather, Drought | Tagged: California drought, climate, December 2013 weather, weather | Leave a comment »