John Hammond
@hydrohammond.bsky.social
Research hydrologist and river photographer. www.riversfromabove.com
Pinned
John Hammond
@hydrohammond.bsky.social
· Mar 20
Hydrological Whiplash: Highlighting the Need for Better Understanding and Quantification of Sub‐Seasonal Hydrological Extreme Transitions
Hydrological whiplash, or the sub-seasonal transition between hydrological extremes, has broad implications for water resource management, ecosystems, infrastructure, and human society. As this pheno...
doi.org
Science! Super proud of this commentary that results from conversations started at @agu.org in December. We propose the term hydrological whiplash, sub-seasonal transitions between hydrological extremes, and outline why we think this topic needs greater attention.
doi.org/10.1002/hyp....
doi.org/10.1002/hyp....
Reposted by John Hammond
Born out of our WaterSciCon sessions and workshop in 2024 (thanks @cuahsi.bsky.social and @agu.org!) this was a really fun one to write! We hope it spurs thoughts and new collaborations.
🎉🎉NEW PAPER🎉🎉
"Out of the Forest and Into the Concrete Jungle"
This is some of the work I'm most proud of to date: a new commentary co-authored with 15 amazing urban hydrology (or adjacent) folks after the 2024 WaterSciCon! Details and highlights below... 1/5
doi.org/10.1029/2025...
"Out of the Forest and Into the Concrete Jungle"
This is some of the work I'm most proud of to date: a new commentary co-authored with 15 amazing urban hydrology (or adjacent) folks after the 2024 WaterSciCon! Details and highlights below... 1/5
doi.org/10.1029/2025...
Out of the Forest and Into the Concrete Jungle: Challenges, Opportunities, and Innovations in Urban Hydrology
Urban hydrology lacks an integrative framework across biophysical processes, social mechanisms, and governance processes We provide a path towards unified conceptualizations, efficient implementa...
doi.org
November 28, 2025 at 3:58 PM
Born out of our WaterSciCon sessions and workshop in 2024 (thanks @cuahsi.bsky.social and @agu.org!) this was a really fun one to write! We hope it spurs thoughts and new collaborations.
Reposted by John Hammond
Just now getting around to posting about this. Nice to be part of this study with Quan Zhang and a host of others! We find that the water use efficiency from increased CO2 does not lead to higher tree growth.
You can find the study here: www.nature.com/articles/s41...
You can find the study here: www.nature.com/articles/s41...
Increased efficiency of water use does not stimulate tree productivity - Nature Climate Change
The authors theoretically delineate the maximal increases in tree growth that can be expected from increases in plant intrinsic water-use efficiency, which increases with rising CO2. They highlight en...
www.nature.com
November 25, 2025 at 9:53 PM
Just now getting around to posting about this. Nice to be part of this study with Quan Zhang and a host of others! We find that the water use efficiency from increased CO2 does not lead to higher tree growth.
You can find the study here: www.nature.com/articles/s41...
You can find the study here: www.nature.com/articles/s41...
Time to get your public comments in on the proposed Waters of the U.S. rule that would strip protections for countless wetlands and streams.
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
November 23, 2025 at 11:03 PM
Time to get your public comments in on the proposed Waters of the U.S. rule that would strip protections for countless wetlands and streams.
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
Trout unlimited has a tool on their page that will automatically send your message to the EPA as well as your representatives:
www.tu.org/conservation...
New preprint: “Do lagged ecosystem feedbacks to hydroclimate extremes promote resilience of forest watersheds?” doi.org/10.22541/ess...
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
November 19, 2025 at 7:55 PM
New preprint: “Do lagged ecosystem feedbacks to hydroclimate extremes promote resilience of forest watersheds?” doi.org/10.22541/ess...
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
#Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
“Universal hydrological trends post‑wildfire are obscured by local watershed variability”
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
November 18, 2025 at 7:00 PM
“Universal hydrological trends post‑wildfire are obscured by local watershed variability”
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
iopscience.iop.org/article/10.1...
#Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
Reposted by John Hammond
We're seeking a Program Specialist to lead communications, coordinate federal reporting, and support program initiatives for Lake Champlain Sea Grant and two allied programs. Learn more and apply online at www.uvmjobs.com/postings/84002.
![We're hiring! LCSG seeks a program specialist to join our team [text superimposed on a picture of the Lake Champlain shoreline]](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:th5gekjxzu3z3uwm52pmwx7v/bafkreifjmvpjdmyuxg35a334lvrx7bwymdpucvpjb2minznmaf5d6de4qi@jpeg)
November 17, 2025 at 6:52 PM
We're seeking a Program Specialist to lead communications, coordinate federal reporting, and support program initiatives for Lake Champlain Sea Grant and two allied programs. Learn more and apply online at www.uvmjobs.com/postings/84002.
Reposted by John Hammond
Hydrology Paper of the Day @felipesaa.bsky.social @lytarasova.bsky.social on accurate modelling of nitrate concentration: capturing soil moisture patterns and hydrological connectivity during wet and dry conditions; pattern identification with explainable AI; and catchments in the Midwestern US.
November 17, 2025 at 3:53 AM
Hydrology Paper of the Day @felipesaa.bsky.social @lytarasova.bsky.social on accurate modelling of nitrate concentration: capturing soil moisture patterns and hydrological connectivity during wet and dry conditions; pattern identification with explainable AI; and catchments in the Midwestern US.
Ever wonder how streams and rivers differ in naming across the country and what the most common names are? Here are the most common names of stream/river segments by HUC2 region across the U.S.
November 16, 2025 at 9:41 PM
Ever wonder how streams and rivers differ in naming across the country and what the most common names are? Here are the most common names of stream/river segments by HUC2 region across the U.S.
Hydrological extreme impact on aquatic species in the news: phys.org/news/2025-10...
Almost 75,000 farmed salmon in Scotland escaped into the wild after Storm Amy. Why this may cause lasting damage
When Storm Amy battered the Scottish Highlands in early October, it tore through a salmon farm's sea pens, releasing around 75,000 fish into open water in Loch Linnhe. The scale of the escape is alarm...
phys.org
November 15, 2025 at 12:33 AM
Hydrological extreme impact on aquatic species in the news: phys.org/news/2025-10...
Reposted by John Hammond
Expected impacts from this weekend's major SoCal storm--which now appears likely to feature widespread flood risk and also a few severe thunderstorms--continue to increase. I will have a blog post and YouTube livestream at a TBD time later today to discuss. #CAwx
November 14, 2025 at 5:39 PM
Expected impacts from this weekend's major SoCal storm--which now appears likely to feature widespread flood risk and also a few severe thunderstorms--continue to increase. I will have a blog post and YouTube livestream at a TBD time later today to discuss. #CAwx
“On the Structure of Temporal Variability of Streamflow Responses and the Role of Timescale Interactions — A Synthesis”
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
November 14, 2025 at 6:49 PM
“On the Structure of Temporal Variability of Streamflow Responses and the Role of Timescale Interactions — A Synthesis”
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
A nice synthesis showing how streamflow variability emerges from interacting timescales — fast events like storms intertwined with slower processes like soil moisture and memory.
Reposted by John Hammond
Still some time to apply for a PhD position in my group @ufz.de in my group with the focus on streams, hydrometric and isotopic signatures and ML: recruitingapp-5128.de.umantis.com/Vacancies/32... Looking forward for your applications 🤩
November 14, 2025 at 3:39 PM
Still some time to apply for a PhD position in my group @ufz.de in my group with the focus on streams, hydrometric and isotopic signatures and ML: recruitingapp-5128.de.umantis.com/Vacancies/32... Looking forward for your applications 🤩
Reposted by John Hammond
The National Water Availability Assessment cyberseminar series is back on schedule for next week! USGS's Althea Archer and Anthony Martinez for, Communicating the Science with Data Science and Visualizations.
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
November 13, 2025 at 6:56 PM
The National Water Availability Assessment cyberseminar series is back on schedule for next week! USGS's Althea Archer and Anthony Martinez for, Communicating the Science with Data Science and Visualizations.
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
November 19, 12pm-1pm ET
More information available on our website - lnkd.in/e_a8u-Tp
Refinding joy in exploring streamflow data 😍 just looking at the stories gages tell about rivers.
Here’s the Allagash River (ME), 1980–2020. Each line: a year of daily flow (Jan–Dec). Colors show each day compared to normal: green ≈ normal, blue = high, red = low. 🌊💧
#Hydrology #DataViz #sciArt
Here’s the Allagash River (ME), 1980–2020. Each line: a year of daily flow (Jan–Dec). Colors show each day compared to normal: green ≈ normal, blue = high, red = low. 🌊💧
#Hydrology #DataViz #sciArt
November 12, 2025 at 6:54 PM
Refinding joy in exploring streamflow data 😍 just looking at the stories gages tell about rivers.
Here’s the Allagash River (ME), 1980–2020. Each line: a year of daily flow (Jan–Dec). Colors show each day compared to normal: green ≈ normal, blue = high, red = low. 🌊💧
#Hydrology #DataViz #sciArt
Here’s the Allagash River (ME), 1980–2020. Each line: a year of daily flow (Jan–Dec). Colors show each day compared to normal: green ≈ normal, blue = high, red = low. 🌊💧
#Hydrology #DataViz #sciArt
WHERE THE SKY KEEPS
BURSTING
A Washington Post investigation shows why much of the Eastern U.S. is increasingly vulnerable to extreme rain and floods.
wapo.st/47MDvXi
BURSTING
A Washington Post investigation shows why much of the Eastern U.S. is increasingly vulnerable to extreme rain and floods.
wapo.st/47MDvXi
Where the sky keeps bursting
A Washington Post investigation shows why one region of the United States is increasingly vulnerable to extreme rainfall and floods.
wapo.st
November 12, 2025 at 3:39 PM
WHERE THE SKY KEEPS
BURSTING
A Washington Post investigation shows why much of the Eastern U.S. is increasingly vulnerable to extreme rain and floods.
wapo.st/47MDvXi
BURSTING
A Washington Post investigation shows why much of the Eastern U.S. is increasingly vulnerable to extreme rain and floods.
wapo.st/47MDvXi
I’m still figuring out bluesky… but with the goal of more easily finding information I’m interested in, I started a feed and associated starter pack for Hydrological Processes as well as Hydrological Extremes. Please let me know if you want to be added to the starter pack! bsky.app/profile/did:...
November 11, 2025 at 6:15 PM
I’m still figuring out bluesky… but with the goal of more easily finding information I’m interested in, I started a feed and associated starter pack for Hydrological Processes as well as Hydrological Extremes. Please let me know if you want to be added to the starter pack! bsky.app/profile/did:...
Reposted by John Hammond
We're hiring in history of science at UW Madison! TT Assistant Professorship with a focus on water. Joint appointment between the History and Integrated Liberal Studies depts, and part of a university-wide hiring cluster on earth/sustainability science. jobs.wisc.edu/jobs/profess... #STS #HSMT
Professor of History - Madison, Wisconsin, United States
Current Employees: If you are currently employed at any of the Universities of Wisconsin, log in to Workday to apply through the internal application process.Job Category:FacultyEmployment Type:Regula...
jobs.wisc.edu
November 6, 2025 at 7:37 PM
We're hiring in history of science at UW Madison! TT Assistant Professorship with a focus on water. Joint appointment between the History and Integrated Liberal Studies depts, and part of a university-wide hiring cluster on earth/sustainability science. jobs.wisc.edu/jobs/profess... #STS #HSMT
@pbs.org NOVA keeping up the excellent science communication on hydrological extremes!
youtu.be/VHvkp_Quaiw?...
youtu.be/VHvkp_Quaiw?...
Superfloods: Why Deadly Flash Floods Are on the Rise | Full Documentary | NOVA | PBS
YouTube video by NOVA PBS Official
youtu.be
November 6, 2025 at 8:58 PM
@pbs.org NOVA keeping up the excellent science communication on hydrological extremes!
youtu.be/VHvkp_Quaiw?...
youtu.be/VHvkp_Quaiw?...
Fond memories from exploring the hydrology of Scotland this time last year
November 5, 2025 at 7:44 PM
Fond memories from exploring the hydrology of Scotland this time last year
I’ve just been learning about the Cleveland Water Alliance because of there super helpful YouTube videos explaining IOT sensor setup. What they’re doing with water monitoring across their region is amazing! m.youtube.com/@clevelandwa...
October 28, 2025 at 4:48 PM
I’ve just been learning about the Cleveland Water Alliance because of there super helpful YouTube videos explaining IOT sensor setup. What they’re doing with water monitoring across their region is amazing! m.youtube.com/@clevelandwa...
Significant precipitation finally headed for areas of the northeast that are in severe and extreme hydrological drought
October 28, 2025 at 3:02 PM
Significant precipitation finally headed for areas of the northeast that are in severe and extreme hydrological drought
Excited to start playing around with #IOT again! Narrow band IOT sensors are affordable and claim to have very long battery life with SIM cards that have a one time up front payment. Let’s see how this goes over the coming days….
October 28, 2025 at 12:52 AM
Excited to start playing around with #IOT again! Narrow band IOT sensors are affordable and claim to have very long battery life with SIM cards that have a one time up front payment. Let’s see how this goes over the coming days….
Reposted by John Hammond
💧 #WaterWednesday: The "predictability desert"
Between weather forecasts & climate projections lies a gap: 2 weeks-2 months out. This S2S timescale is crucial for water management but remains a weak link in forecasting.
New call for scientists to join forces: eos.org/opinions/sci...
Between weather forecasts & climate projections lies a gap: 2 weeks-2 months out. This S2S timescale is crucial for water management but remains a weak link in forecasting.
New call for scientists to join forces: eos.org/opinions/sci...
October 22, 2025 at 3:26 PM
💧 #WaterWednesday: The "predictability desert"
Between weather forecasts & climate projections lies a gap: 2 weeks-2 months out. This S2S timescale is crucial for water management but remains a weak link in forecasting.
New call for scientists to join forces: eos.org/opinions/sci...
Between weather forecasts & climate projections lies a gap: 2 weeks-2 months out. This S2S timescale is crucial for water management but remains a weak link in forecasting.
New call for scientists to join forces: eos.org/opinions/sci...
Reposted by John Hammond
Happy Friday!! Here are your #CatchmentCup2025 Great Eight!!
Its time to NARROW down to the Fabulous Four! You have until Tuesday 10/28 to vote and check out the amazing papers from these sites here: www.agu-h3s.org/rivercup
Its time to NARROW down to the Fabulous Four! You have until Tuesday 10/28 to vote and check out the amazing papers from these sites here: www.agu-h3s.org/rivercup
October 24, 2025 at 9:29 PM
Happy Friday!! Here are your #CatchmentCup2025 Great Eight!!
Its time to NARROW down to the Fabulous Four! You have until Tuesday 10/28 to vote and check out the amazing papers from these sites here: www.agu-h3s.org/rivercup
Its time to NARROW down to the Fabulous Four! You have until Tuesday 10/28 to vote and check out the amazing papers from these sites here: www.agu-h3s.org/rivercup