Sean de Guzman, the manager of the California department of water resources snow surveys and water supply forecasting unit, and his team measure snowpack in January 2024. Photo: Andrew Nixon / California department of water resources

California snowpack lowest in decade despite hope with December 2023 storms – “In some places there is literally no measurable snow on the ground at all”

By Gabrielle Canon 4 January 2024 (The Guardian) – In the first snow survey of the season, California came up short – just 25% of the historical average – despite a spate of strong storms that caused flooding and landslides along the coast in late December. On Tuesday, officials measured a depth of just 7.5in at a […]

Estimated conifer vegetation climate mismatch (VCM) in the Sierra Nevada (2015-2020). (a) The conifer HSM projected to contemporary climate and overlayed on the modern conifer distribution (EVeg) reveals that up to 19.5% of modern conifer forest is in VCM, primarily along the low-elevation western slope of the Sierras. The total area of conifers shown is 40,495 km2, of which ∼32,500 km2 are in equilibrium with the modern climate. (b) Mean Temperature of Wettest Quarter and Mean Annual Precipitation were the most important predictors in the HSM (meanMTWQ = 0.518, SEMTWQ = 0.209 and meanMAP = 0.418, SEMAP = 0.139). Standard error bars are included in the barplot. (c) Boxplots show the difference between modern (2015–2020) and historical (1915–1955) climate within the conifer VCM regions. Change in climate is calculated as the number of standard deviations the modern climate differs from the historical period. Though the differences were statistically significant for each climate variable (p < 8.45 × 10−12, independent t-test), Precipitation of Driest Month showed the greatest decrease (mean = −2.41, SD = 2.84) and MTWQ the greatest increase (mean = 1.59, SD = 0.329) between the historical and modern climate. Mean Annual Precipitation changed the least within the VCM area (mean = 0.165, SD = 0.395). Boxplots include the median line, a box denoting the interquartile range, and whiskers showing values ±1.5 × the interquartile range. Graphic: Hill, et al., 2023 / PNAS Nexus

Researchers are discovering “zombie forests” in new places across the western U.S. – “Our maps force some critical – and difficult – conversations about how to manage impending ecological transitions”

By Brendan O’Leary 13 May 2023 (The Cool Down) – It’s no secret that our warming atmosphere has resulted in extreme weather all over the world, but there’s also a less noticeable consequence at work as well. Rising ambient temperatures mean that thousands of coniferous forests in California will be unable to replenish their numbers once they die. What […]

A car is pictured stranded in floodwater after floods on 24 March 2023 near Corcoran, California, the biggest city near Lake Tulare. Photo: David Mcnew / Getty

California’s ghost lake nears size of Lake Tahoe

By Robyn White 23 May 2023 (Newsweek) – A ghost lake in California could expand to the size of Lake Tahoe. Lake Tulare in the San Joaquin Valley used to be the largest freshwater lake in the Western U.S. It dried up some 80 years ago when the land was re-developed for agricultural purposes. But […]

The Glen Canyon Dam in Page, Arizona, performed high flow experiments on 25 April 2023. Video: John Farrell / The Washington Post

Lake Powell is rising more than a foot a day, but megadrought’s effects will still be felt – “It’s maybe a year’s worth of breathing room. The crisis is still very real and very much in front of us.”

By Scott Dance 11 May 2023 (The Washington Post) – Weeks after the surface of Lake Powell sunk to an all-time low, the key Colorado River reservoir is rising more than a foot a day — on track to deepen by some 70 feet in the coming months. Spring flows into the lake are among the […]

Satellite view of end-of-winter snowpack levels in the Sierra Nevada mountain range from 2020 through 2023. The snowpack in 2023 was one of the biggest in recorded history. Photo: NASA

Striking satellite photos show the dramatic scale of California’s 2023 snowpack – “This melt really is still just getting started”

By Terry Castleman 10 May 2023 (Los Angeles Times) – After a series of atmospheric rivers and cold weather hit California, this year’s snowpack was one of the biggest in history. “This year’s result will go down as one of the largest snowpack years on record in California,” Sean de Guzman, manager of the Department of Water Resources’ snow surveys, said […]

Lake Tulare in California on 1 February 2023 and 30 April 2023, as seen from the Operational Land Imager (OLI) on NASA’s Landsat 8 satellite, and the Operational Land Imager-2 (OLI-2) on the Landsat 9 satellite. In the spring of 2023, the long-dried basin of Lake Tulare rapidly refilled in the wake of intense rainfall and snowmelt. Photo: NASA

Tulare Lake flooding due to snowpack melt seen from space – “The state has both too much water and not enough”

By Jess Thomson 5 May 2023 (Newsweek) – The long-dried basin of Lake Tulare in California has rapidly refilled in the wake of intense rainfall and snowmelt. The speed and scale of the southern San Joaquin Valley lake’s return can be seen in images taken from space by the Operational Land Imager (OLI) on NASA‘s Landsat […]

A car is stranded on a flooded road near Corcoran, California, on 23 March 2023. Photo: David McNew / Getty Images

A long-dormant lake has reappeared in California, bringing havoc along with it – “This impending monster – a 50-foot-plus deep snowpack that we haven’t seen in 75 years – is sitting up there, and we just don’t know how fast it’s going to turn into water and come out of the mountains”

By Evan Bush 2 April 2023 (NBC News) – People have worked for a century to make California’s Tulare Basin into a food grower’s paradise. That pastoral landscape now looks more like the Pacific Ocean in many areas. Months of atmospheric river storms have pummeled the area and saturated the basin’s soil, which sits about […]

(a) Annual snow-zone fire detections subset by snow seasonality in California, 2001–2021. (b) Snow seasonality classifications for California. (c) All fire detections (2001–2021), colored by snow seasonality classification: blue (seasonal), red (ephemeral), and gray (non-snow zone). Fire detections in seasonal (blue) and ephemeral (red) snow zones during (d) 2001–2019 and (e) 2020–2021, noting fires named in the text. Graphic: Hatchett, et al., 2023 / Geophysical Research Letters

California’s snowpack is melting faster than ever before, leaving less available water – “The threats to the state’s water supply are imminent”

By Hayley Smith 14 February 2023 (Los Angeles Times) – For decades, Californians have depended on the reliable appearance of spring and summer snowmelt to provide nearly a third of the state’s supply of water. But as the state gets drier, and as wildfires climb to ever-higher elevations, that precious snow is melting faster and […]

Satellite view of changes to the Sierra Nevada snowpack, 2006-2021. Photo: NASA

Sierra Nevada snowpack, a crucial water resource, could disappear in 25 years – “A low-to-no-snow future has massive implications for where and when water is stored in the western U.S.”

By Denise Chow 1 December 2021 (NBC News) – The Sierra Nevada snowpack, a major source of water for California, could largely disappear in 25 years if global warming continues unchecked, according to a recent study. The worrisome findings, published 26 October 2021 in the journal Nature Reviews Earth & Environment, have serious implications for California’s […]

Global warming taking toll on $20 billion ski industry – Snowpack in Western U.S. declined 41 percent from 1982 to 2016 – “Where is my livelihood in the future, in three to four, five years?”

By Diana Olick 21 March 2019 (CNBC) – Skiers in the western U.S. are enjoying one of the best seasons in years. But experts warn that years like this are quickly becoming the exception, not the rule. Snow sport seasons are getting shorter, due to warmer temperatures. That is already having a distinguishable financial impact […]

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