John Garver
@geogarver.bsky.social
Prof. of Geology, Cordilleran tectonics, rivers, hydrology, ice jams, water quality, invasive species, natural disasters, geochronology. Mohawk and Hudson watersheds. Board of Riverkeeper. Alaska, PNW, Maine, NY. "Notes from a Watershed" @ substack
Reposted by John Garver
PFAS levels in #GreatLakes fish are dropping, study finds
The declining levels were driven by an industry phase-out of legacy PFAS chemicals
www.wpr.org/news/pfas-le...
The declining levels were driven by an industry phase-out of legacy PFAS chemicals
www.wpr.org/news/pfas-le...
PFAS levels in Great Lakes fish are dropping, study finds
A new study shows PFAS levels in Great Lakes fish are on the decline as manufacturers have phased out some chemicals in recent decades.
www.wpr.org
February 6, 2026 at 8:10 PM
PFAS levels in #GreatLakes fish are dropping, study finds
The declining levels were driven by an industry phase-out of legacy PFAS chemicals
www.wpr.org/news/pfas-le...
The declining levels were driven by an industry phase-out of legacy PFAS chemicals
www.wpr.org/news/pfas-le...
Really interesting paper about the northward shift of the boreal forest with an informative and well done video abstract summary.
bg.copernicus.org/articles/23/...
bg.copernicus.org/articles/23/...
Northward shift of boreal tree cover confirmed by satellite record
Abstract. The boreal forest has experienced the fastest warming of any forested biome in recent decades. While vegetation–climate models predict a northward migration of boreal tree cover, the long-te...
bg.copernicus.org
February 10, 2026 at 12:55 PM
Really interesting paper about the northward shift of the boreal forest with an informative and well done video abstract summary.
bg.copernicus.org/articles/23/...
bg.copernicus.org/articles/23/...
Reposted by John Garver
❄️TUESDAY - Snow on the way for #Maine. My latest thinking on timing, amounts, and bust potential ► pinetreeweather.substack.com/p/tuesdaywed...
#HeyBangor #PortlandMaine #theloaf #MEwx
#HeyBangor #PortlandMaine #theloaf #MEwx
Tuesday/Wednesday storm information and timeline
All you need to know
pinetreeweather.substack.com
February 10, 2026 at 10:37 AM
❄️TUESDAY - Snow on the way for #Maine. My latest thinking on timing, amounts, and bust potential ► pinetreeweather.substack.com/p/tuesdaywed...
#HeyBangor #PortlandMaine #theloaf #MEwx
#HeyBangor #PortlandMaine #theloaf #MEwx
Reposted by John Garver
Michael O'Toole (Canadian, 1963–2018)
"Soft Morning West Coast Trail", 2001.
Acrylic on Canvas, 76.2 × 76.2 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
"Soft Morning West Coast Trail", 2001.
Acrylic on Canvas, 76.2 × 76.2 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
February 9, 2026 at 10:25 AM
Michael O'Toole (Canadian, 1963–2018)
"Soft Morning West Coast Trail", 2001.
Acrylic on Canvas, 76.2 × 76.2 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
"Soft Morning West Coast Trail", 2001.
Acrylic on Canvas, 76.2 × 76.2 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
Reposted by John Garver
It’s all up hill from here!
I don’t know about you, but I’m ready for a thaw! For most around US and all of us in #Florida, warmth will build and last for the next 2 weeks. The exception: the West, chilly and snowy for the ski resorts. A win-win for all!
I don’t know about you, but I’m ready for a thaw! For most around US and all of us in #Florida, warmth will build and last for the next 2 weeks. The exception: the West, chilly and snowy for the ski resorts. A win-win for all!
February 9, 2026 at 1:26 PM
It’s all up hill from here!
I don’t know about you, but I’m ready for a thaw! For most around US and all of us in #Florida, warmth will build and last for the next 2 weeks. The exception: the West, chilly and snowy for the ski resorts. A win-win for all!
I don’t know about you, but I’m ready for a thaw! For most around US and all of us in #Florida, warmth will build and last for the next 2 weeks. The exception: the West, chilly and snowy for the ski resorts. A win-win for all!
Reposted by John Garver
Relative elevation models are both compelling visualizations of fluvial systems but also frankly useful for geologic mapping of terraces or quantifying zones of potential flood inundation. Several years ago Open Topography coded up an method for using python to make REMs (see below) 🧵
February 9, 2026 at 8:37 PM
Relative elevation models are both compelling visualizations of fluvial systems but also frankly useful for geologic mapping of terraces or quantifying zones of potential flood inundation. Several years ago Open Topography coded up an method for using python to make REMs (see below) 🧵
Reposted by John Garver
what a winter wonderland. can even see the ice breaking apart over Lake Erie
#weather #satellite #goes #wxsky
#weather #satellite #goes #wxsky
February 8, 2026 at 7:39 PM
what a winter wonderland. can even see the ice breaking apart over Lake Erie
#weather #satellite #goes #wxsky
#weather #satellite #goes #wxsky
Reposted by John Garver
February 8, 2026 at 8:18 AM
Reposted by John Garver
The last week has been exceptionally amplified. The average temps for the 7 day stretch were 10-20° F above normal West, 10-15° East. That’s not an easy feat! 100s of records broken!
February 7, 2026 at 5:42 PM
The last week has been exceptionally amplified. The average temps for the 7 day stretch were 10-20° F above normal West, 10-15° East. That’s not an easy feat! 100s of records broken!
Reposted by John Garver
February 8, 2026 at 7:37 PM
Reposted by John Garver
A much-needed major weather pattern change is finally coming for the continental U.S.! The "Warm West/Cool East" temperature dipole, which has been associated with record Western warmth and extreme Eastern cold/ice/snow, will finally fade in the coming days.
February 6, 2026 at 3:48 PM
A much-needed major weather pattern change is finally coming for the continental U.S.! The "Warm West/Cool East" temperature dipole, which has been associated with record Western warmth and extreme Eastern cold/ice/snow, will finally fade in the coming days.
Reposted by John Garver
Tsuchiya Koitsu (Japanese, 1870—1949)
"Manazuru Harbour at Night", 1936.
Woodblock Print, 20.5 × 28.5 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
"Manazuru Harbour at Night", 1936.
Woodblock Print, 20.5 × 28.5 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
February 7, 2026 at 3:21 AM
Tsuchiya Koitsu (Japanese, 1870—1949)
"Manazuru Harbour at Night", 1936.
Woodblock Print, 20.5 × 28.5 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
"Manazuru Harbour at Night", 1936.
Woodblock Print, 20.5 × 28.5 cm.
Private Collection.
#art #painting #artist #BlueSkyArt
Reposted by John Garver
An interesting setup involving an inverted trough will likely bring narrow bands of heavier snow into southeast New Hampshire & northeast Massachusetts.Exactly where these bands set up will be a game-time decision as they are narrow. Widespread 2-4" will fall elsewhere. #MAwx #CTwx #RIwx #NHwx #VTwx
February 6, 2026 at 11:35 PM
An interesting setup involving an inverted trough will likely bring narrow bands of heavier snow into southeast New Hampshire & northeast Massachusetts.Exactly where these bands set up will be a game-time decision as they are narrow. Widespread 2-4" will fall elsewhere. #MAwx #CTwx #RIwx #NHwx #VTwx
Reposted by John Garver
PFOA caused more pronounced neurodevelopmental toxicity and behavioral abnormalities than PFBA - but - co-exposure further exacerbated these detrimental phenotypes and triggered a cellular energy metabolism crisis. #PFAS
www.sciencedirect.com/science/arti...
www.sciencedirect.com/science/arti...
Co-exposure to PFOA, PFBA and nanoplastics synergistically exacerbates neurotoxicity by impairing PINK1/Parkin-mediated mitophagy
Perfluorooctanoic acid (PFOA) and perfluorobutyric acid (PFBA), as representative long-chain and short-chain per- and polyfluoroalkyl substances (PFAS…
www.sciencedirect.com
February 6, 2026 at 12:09 PM
PFOA caused more pronounced neurodevelopmental toxicity and behavioral abnormalities than PFBA - but - co-exposure further exacerbated these detrimental phenotypes and triggered a cellular energy metabolism crisis. #PFAS
www.sciencedirect.com/science/arti...
www.sciencedirect.com/science/arti...
Reposted by John Garver
🥶🌬️❄️FRIDAY - An inverted trough may bring snow to far western and southern #Maine on Saturday. Could the shorelines get more? ► pinetreeweather.substack.com/p/snow-showe...
#HeyBangor #PortlandMaine #theloaf #MEwx
#HeyBangor #PortlandMaine #theloaf #MEwx
Snow showers with squalls possible Friday night into Saturday
One more round of bitter cold before temperatures rise next week
pinetreeweather.substack.com
February 6, 2026 at 11:31 AM
🥶🌬️❄️FRIDAY - An inverted trough may bring snow to far western and southern #Maine on Saturday. Could the shorelines get more? ► pinetreeweather.substack.com/p/snow-showe...
#HeyBangor #PortlandMaine #theloaf #MEwx
#HeyBangor #PortlandMaine #theloaf #MEwx
"Contaminated: The Carpet Industry’s Toxic Legacy"
Frontline - February 3, 2026 #PFAS
"Local governments say the problem is too vast for them to fix alone."
A sobering look at the depth of the PFAS crisis.
www.pbs.org/wgbh/frontli...
Frontline - February 3, 2026 #PFAS
"Local governments say the problem is too vast for them to fix alone."
A sobering look at the depth of the PFAS crisis.
www.pbs.org/wgbh/frontli...
February 5, 2026 at 7:00 PM
"Contaminated: The Carpet Industry’s Toxic Legacy"
Frontline - February 3, 2026 #PFAS
"Local governments say the problem is too vast for them to fix alone."
A sobering look at the depth of the PFAS crisis.
www.pbs.org/wgbh/frontli...
Frontline - February 3, 2026 #PFAS
"Local governments say the problem is too vast for them to fix alone."
A sobering look at the depth of the PFAS crisis.
www.pbs.org/wgbh/frontli...
Reposted by John Garver
How a SC Riverkeeper's Detective Work Reveals a Deeper Tale About the Carpet Industry's PFAS Legacy
->PBS | More on "PFAS pollution from carpet industry" at BigEarthData.ai | #pfas #toxic
->PBS | More on "PFAS pollution from carpet industry" at BigEarthData.ai | #pfas #toxic
How a SC Riverkeeper's Detective Work Reveals a Deeper Tale About the Carpet Industry's PFAS Legacy
1. A surprising result One day in May 2022, Bill Stangler eased his green canoe into the cool current of the Lower Saluda River, a ribbon of water that springs from the depths of Lake Murray and is so cold...
www.pbs.org
February 4, 2026 at 1:16 AM
Reposted by John Garver
A very light snow is on the way for the weekend. An inverted trough over the ocean may allow for some ocean enhancement, but this would likely still only bring a couple inches to eastern MA and NH. More impactful will be the Arctic blast that follows. #MAwx #CTwx #RIwx #NHwx #MEwx #VTwx
February 5, 2026 at 12:03 AM
Reposted by John Garver
Just out today: The report “A Nordic Perspective on AMOC Tipping” reviews the current state of science on the risk of Atlantic Meridional Overturning Circulation (#AMOC) shutdown. 🌊
Conclusion: it's "a serious risk which requires a dedicated risk management framework".
pub.norden.org/temanord2026...
Conclusion: it's "a serious risk which requires a dedicated risk management framework".
pub.norden.org/temanord2026...
A Nordic Perspective on AMOC Tipping
This report is the outcome of the Nordic Council of Minister’s sponsored workshop arranged in October 21-24, 2025 in Helsinki and Rovaniemi, Finland as part of Finland’s council presidency theme resil...
pub.norden.org
February 5, 2026 at 10:46 AM
Just out today: The report “A Nordic Perspective on AMOC Tipping” reviews the current state of science on the risk of Atlantic Meridional Overturning Circulation (#AMOC) shutdown. 🌊
Conclusion: it's "a serious risk which requires a dedicated risk management framework".
pub.norden.org/temanord2026...
Conclusion: it's "a serious risk which requires a dedicated risk management framework".
pub.norden.org/temanord2026...
Reposted by John Garver
“Basically, (it’s) a new threshold for what is acceptable in groundwater. It matches what’s acceptable in drinking water systems. And that number is basically four parts per trillion for the most common #PFAS substances. It had been 20 (parts per trillion)”
www.benningtonbanner.com/local-news/s...
www.benningtonbanner.com/local-news/s...
State has adopted new rule lowering the acceptable amount of PFAS in groundwater
The state has officially adopted a new rule lowering the acceptable amount of PFAS in groundwater. State Rep. Dave Durfee, D-Shaftsbury, brought the news to the Select Board’s meeting on Monday.
www.benningtonbanner.com
February 4, 2026 at 12:38 PM
“Basically, (it’s) a new threshold for what is acceptable in groundwater. It matches what’s acceptable in drinking water systems. And that number is basically four parts per trillion for the most common #PFAS substances. It had been 20 (parts per trillion)”
www.benningtonbanner.com/local-news/s...
www.benningtonbanner.com/local-news/s...
Reposted by John Garver
❄️WEDNESDAY - Snow showers around #Maine today, far eastern areas may pick up an inch or two. Brutal cold and gusty winds over the weekend raise concerns ► pinetreeweather.substack.com/p/snow-showe...
#HeyBangor #PortlandMaine #theloaf #MEwx
#HeyBangor #PortlandMaine #theloaf #MEwx
Snow showers for Wednesday
Polar front arriving over the weekend means business
pinetreeweather.substack.com
February 4, 2026 at 10:42 AM
❄️WEDNESDAY - Snow showers around #Maine today, far eastern areas may pick up an inch or two. Brutal cold and gusty winds over the weekend raise concerns ► pinetreeweather.substack.com/p/snow-showe...
#HeyBangor #PortlandMaine #theloaf #MEwx
#HeyBangor #PortlandMaine #theloaf #MEwx
Prof Patrick Byrne, reader in hydrology and environmental pollution at Liverpool John Moores University, said: “A major blind spot in the plan is that we don’t actually know how much of these chemicals are entering the environment, or where they are coming from. #PFAS
🚨 The UK’s PFAS plan has been slammed as “crushingly disappointing.”
Across Europe, governments are already banning #foreverchemicals to protect environmental and public health.
Why is the UK refusing to act with the same urgency?
www.theguardian.com/environment/...
Across Europe, governments are already banning #foreverchemicals to protect environmental and public health.
Why is the UK refusing to act with the same urgency?
www.theguardian.com/environment/...
Environmentalists decry ‘crushingly disappointing’ Pfas action plan for UK
Ministers’ proposals to tackle ‘forever chemicals’ fail to match tougher stance taken in Europe, say experts
www.theguardian.com
February 3, 2026 at 10:39 AM
Prof Patrick Byrne, reader in hydrology and environmental pollution at Liverpool John Moores University, said: “A major blind spot in the plan is that we don’t actually know how much of these chemicals are entering the environment, or where they are coming from. #PFAS
Reposted by John Garver
🚨Our new paper led by Dr. @zialyle.bsky.social looked at how climate change poses risks to US drinking water utilities & if their bonds disclose these risks to investors. Utilities serving 67 million people have high risks, but 36% of their bonds don't mention climate: www.nature.com/articles/s43...
Climate change risk index and municipal bond disclosures of United States drinking water utilities - Communications Earth & Environment
67 million customers across the US rely on drinking water utilities that face higher climate risk than accounted for, which exposes major gaps in climate adaptation and resilience planning, suggests a...
www.nature.com
February 3, 2026 at 1:06 AM
🚨Our new paper led by Dr. @zialyle.bsky.social looked at how climate change poses risks to US drinking water utilities & if their bonds disclose these risks to investors. Utilities serving 67 million people have high risks, but 36% of their bonds don't mention climate: www.nature.com/articles/s43...
Reposted by John Garver
“A few days ago, sunspot 4366 didn't exist. Now it is a behemoth almost half the size of the great Carrington sunspot. Rapid growth is making the sunspot unstable. It has unleashed dozens of solar flares in past 24 hours, including a powerful X8-class flare” www.spaceweather.com
SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids
www.spaceweather.com
February 2, 2026 at 10:58 PM
“A few days ago, sunspot 4366 didn't exist. Now it is a behemoth almost half the size of the great Carrington sunspot. Rapid growth is making the sunspot unstable. It has unleashed dozens of solar flares in past 24 hours, including a powerful X8-class flare” www.spaceweather.com