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John Hammond

@hydrohammond.bsky.social
1.7K followers 2.9K following 118 posts

Research hydrologist and river photographer. www.riversfromabove.com

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Reposted by John Hammond
Shi En Kim @goesbykim.bsky.social · 21/04/2026
Over 150 definitions exist for the different manifestations of drought, and one of them is pretty gnarly to forecast. Can AI help predict the kind that grips waterways and staunches flow? Spoiler alert for my @azcentral.com piece: yes, AI improves on flow projections, but it's still a ways off.
azcentral.com
A new AI tool could help predict drought on Arizona rivers. Here's how
Climate change is drying out rivers across the country. A new AI forecasting tool can help managers, governments and water users plan.
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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 11/02/2026
Hydrology Paper of the Day @jpgannon.bsky.social @hydrochrista.bsky.social @domciruzzi.bsky.social on understanding the teaching of hydrology at the undergraduate level: course titles, assessments, and objectives; textbooks and grading; and the need for shared educational resources and objectives.
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John Hammond @hydrohammond.bsky.social · 06/02/2026
Snow drought continues across much of the western U.S. For much of the region, below normal precipitation is partly to blame (OR, CO, UT, NM), while above normal temperatures have occurred across nearly the entire region.
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John Hammond @hydrohammond.bsky.social · 21/01/2026
New preprint led by Aaron Heldmyer and Roy Sando: Random forest + donor gages to predict daily streamflow drought across CONUS. Regional drivers differ—soil moisture, precip, SWE matter most. doi.org/10.5194/egus...
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John Hammond @hydrohammond.bsky.social · 15/01/2026
🔥💧 New paper out in Environmental Research: Water led by Brian Ebel! Synthesis shows how wildfires fundamentally shift hydrologic processes and streamflow generation—from infiltration and runoff to baseflow and flood response — post wildfire. iopscience.iop.org/article/10.1...
iopscience.iop.org
A review and synthesis of post-wildfire shifts in hydrologic processes and streamflow generation mechanisms
A review and synthesis of post-wildfire shifts in hydrologic processes and streamflow generation mechanisms, Ebel, Brian A, Hammond, John C, Walvoord, Michelle A, Partridge, Trevor F, Rey, David M, Murphy, Sheila F
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Sarah H. Ledford @sledford.bsky.social · 12/01/2026
If you know an undergraduate looking for a geosciences REU program, our applications are due in one month! Focus this year on community, air, and water projects! sites.google.com/view/csaw-re...
sites.google.com
CSAW REU
Overview
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Reposted by John Hammond
Hilary McMillan @mcmillanhydro.bsky.social · 07/01/2026
I wrote a commentary discussing Daniele's huge new global synthesis of controls on hydrological processes in forested catchments: read it here: rdcu.be/eXTrq . Some surprising findings on the importance of overland flow, soils and antecedent conditions.
rdcu.be
Forest streamflow driven by soils, topography and previous rains
Nature Water - Forests cover almost a third of earth’s land and supply high-quality streamflow and groundwater. A global synthesis of forested catchments provides surprising insights into the...
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Anne Jefferson @annejefferson.bsky.social · 07/01/2026
New paper! Real-time flood inundation mapping (FIM) services are an incredibly valuable tool for emergency management and affected communities. But do their visualizations help users quickly and accurately interpret information to make decisions? onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com
Comparing Flood Inundation Map Features and Diagnosing Decision Support Design Challenges
Using visualisation typologies, we developed a diagnostic evaluation method for eight user-controlled ensemble FIM visualisations. Key design challenges include unclear messaging, non-accessible and ...
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Daniele Penna @danielepenna.bsky.social · 07/01/2026
How do #climate, #antecedent #moisture, #soils, #topography, #geology, and #vegetation control #runoff #processes in #forested #catchments worldwide? Find this out here rdcu.be/eXTtd! @natwater.nature.com Thanks a lot @mcmillanhydro.bsky.social for this commentary www.nature.com/articles/s44...!
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John Hammond @hydrohammond.bsky.social · 01/01/2026
I’ve always been more of a photographer than anything else when it comes to art. Still trying sketching sometimes, but also enjoying creating vector art versions of my #riversfromabove photos, and some other travel photos. I feel like style is “you love/hate it” without much in the middle. Thoughts?
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Giulia Bruno @gbrunohydro.bsky.social · 03/12/2025
A piece that felt particularly relevant to write
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Ryoko Araki @rarakihydro.bsky.social · 29/12/2025
Check out the end-of-the-year blogpost about model design by Jonathan Frame! deepgroundwater.com/blog/what-do...
deepgroundwater.com
What does your model do? - Deep Groundwater
A collection of open-source blog posts and articles
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Ryan Webb @webbhydrology.bsky.social · 29/12/2025
New paper in WRR: Snow Sublimation Significantly Decreases Following Stand-Replacing Fire With Minor Water Balance Impacts From Forest Thinning in a Water Limited Forest. find it here: doi.org/10.1029/2025...
doi.org
Snow Sublimation Significantly Decreases Following Stand‐Replacing Fire With Minor Water Balance Impacts From Forest Thinning in a Water Limited Forest
Snow sublimation is significantly reduced following a wildfire A thinning prescription that targeted ladder fuels and white fir had minimal impacts on sublimation and the overall water balance
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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 27/12/2025
Hydrology Paper of the Day @andy-baker.bsky.social on quantifying the drip of water underground as part of rainfall recharge: groundwater monitoring near the water table in Australia; why mines, tunnels and caves are essential monitoring locations; and relating rock aquifer response to rainfall.
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Thiago Nascimento @thiagovnascimento.bsky.social · 19/12/2025
Working with large-sample hydrology datasets and curious about how maps with varying levels of detail influence the identification of geology–streamflow relationships? Check out our latest preprint at HESS! #Hydrology #CatchmentHydrology #LargeSampleHydrology #Eawag #hightlightpaper #HESS
doi.org
How do geological map details influence the identification of geology-streamflow relationships in large-sample hydrology studies?
Abstract. Large-sample hydrology datasets have advanced hydrological research, yet the impact of landscape map details on identifying dominant streamflow generation processes remains underexplored. Th...
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John Hammond @hydrohammond.bsky.social · 18/12/2025
@rarakihydro.bsky.social leads an exiting new preprint that maps dominant hydrologic processes across >14k US watersheds using streamflow signatures + ML. It’s been such fun following Ryoko and Hilary’s leadership alongside Admin, Anne and Gemma. egusphere.copernicus.org/preprints/20...
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Frederik Kratzert @kratzert.bsky.social · 18/12/2025
Excited to unveil Caravan-Qual! 🌊 We've expanded the Caravan framework to bridge the gap between water quantity and quality. This new open dataset features: 🔹 ~70M observations 🔹137k stations 🔹 100 constituents 🔹 Linked streamflow, forcing & attributes Links in 🧵
A world map with red and blue dots. Each dot denotes a water quality measurement station that is included in Caravan-Qual. Red dots are stations with additional streamflow observations. Blue dots are stations without streamflow observations.
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Margaret Zimmer @margaretzimmer.bsky.social · 18/12/2025
Happening this morning! Run don’t walk to room 228-230 to hear @zhaozhechen.bsky.social talk hydroclimate-ET synchrony!! @agu.org
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Daniel Swain @weatherwest.bsky.social · 17/12/2025
In case you missed it live, a full recording of my rapid-response livestream regarding news surrounding the proposed imminent and sudden dismantling of the National Center for Atmospheric Research (NCAR) is now available.
youtu.be
Special rapid response stream re: proposed dismantling of National Center for Atmospheric Research
The latest in a recurring series of live, virtual, & interactive "office hours" hosted by Dr. Daniel Swain on various topics related to extreme #weather and #climate. 12/17/2025 topic: This will be a special emergency livestream to discuss the context and broader implications of breaking news last n
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Eric Booth @egbooth.bsky.social · 17/12/2025
Another example - from just today - of excellent and essential climate and weather research from @ncar-ucar.bsky.social with clear impacts on flood-prone communities doi.org/10.1038/s432... #NCAR
doi.org
Moisture from US Corn Belt fuels more intense convective storms - Communications Earth & Environment
The groundwater-crop-irrigation interactions across the US Corn Belt amplify convective storm frequency, extend storm lifetime, and accelerate storm movement, based on a high-resolution regional clima...
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Daniel Swain @weatherwest.bsky.social · 17/12/2025
I 'll have a special rapid-response livestream for 8:30am PT today to discuss dire implications of this proposal to dismantle NCAR. Due to extreme fire weather in Boulder today (and associated pre-emptive power outages/NCAR closure), I am going live ASAP. www.youtube.com/live/FTKW68R...
youtube.com
Special rapid response stream re: proposed dismantling of National Center for Atmospheric Research
YouTube video by Weather West
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UK Centre for Ecology & Hydrology (UKCEH) @ukceh.bsky.social · 17/12/2025
The latest UK Hydrological Summary has been published 🌧️ November was UK's wettest month so far in 2025 & many areas have shifted from drought concerns to flood risk. Groundwater levels notably low and reservoir levels still below average in parts. Winter rainfall amount will be crucial. 🧪 1/
Maps of UK indicating river flows in November 2025 and in September 2025 to November 2025
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John Hammond @hydrohammond.bsky.social · 15/12/2025
Photos from the Patapsco River in Maryland yesterday. Lucky to have the snow stick to the trees despite the high winds! #riversfromabove
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Daniel Swain @weatherwest.bsky.social · 12/12/2025
The fact that parts of Washington are seeing record-breaking flooding this week is not surprising given that 1) many locations saw record 24hr precipitation (well above 100yr ARI) & 2) near-record temperatures *simultaneously* (no snow in mtns, so all precip became runoff). #WAwx
Map showing locations where recent 24 hour precipitation exceeded estimated 100yr recurrence interval thresholds. There are many such locations east of Puget Sound in Washington. Via Russ Schumacher's Precipitation Systems Research Group website (https://schumacher.atmos.colostate.edu/precip_monitor/precip_monitor.php?atlas=atlas14&dataset=stage4&ari=1000y&duration=48h).
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The Associated Press @apnews.com · 11/12/2025
A powerful atmospheric river has drenched Washington state with nearly 5 trillion gallons of rain over the past week. The deluge is linked to warm water and air, along with unusual weather conditions tracing back to tropical cyclone flooding in Indonesia.
bit.ly
Blend of unusual weather conditions brings trillions of gallons in persistent rain to the Northwest
A powerful atmospheric river has drenched Washington state with nearly 5 trillion gallons of rain over the past week.
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John Hammond @hydrohammond.bsky.social · 11/12/2025
Sand bag deployment and flood as seen from USGS High Vis camera in Everson, WA apps.usgs.gov/hivis/camera...
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Anthony Edwards @edwardsanthonyb.bsky.social · 10/12/2025
Officials warned of “locally catastrophic” river flooding in Washington state Wednesday amid a major atmospheric river storm that was poised to drop 20 inches of rain in the Cascade Range. Two rivers north of Seattle, the Snohomish and Skagit rivers, were predicted to crest at record levels.
sfchronicle.com
Atmospheric river dumping 20 inches of rain on West Coast mountain range
Dozens of rivers were forecast to spill their banks across the Pacific Northwest, as Washington state braced for its worst flooding in at least 16 years.
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Steve Herman @newsguy.bsky.social · 10/12/2025
Washington Gov. Bob Ferguson declares a statewide emergency in response to flooding occurring throughout the Pacific Northwest. www.king5.com/article/weather...
king5.com
Statewide emergency declared in Washington as major flooding occurs
Gov. Ferguson is asking the federal government to approve an expedited emergency declaration for the 'extremely serious' situation.
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Ross Woods @rosswoodskiwi.bsky.social · 10/12/2025
Bettina Schaefli and I warmly invite you to submit abstracts to a new EGU session HS2.2.5 New Developments in Hydrological Synthesis Abstract submission: www.egu26.eu/session/55911 1/6
egu26.eu
Session HS2.2.5
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Daniel Swain @weatherwest.bsky.social · 10/12/2025
On Wednesday, widespread heavy rain & very high snow levels (7,000-9,000 feet) will cause enormous runoff into already swollen rivers. Widespread moderate to major flood is likely, with some rivers expected to experience *record* flooding (esp. Skagit & Snohomish). #WAwx [2/3]
Snapshot from NOAA National Water Center website depicting all river forecast points in Washington expected to experience flooding. There are numerous purple squares visible, denoting "major flooding."
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John Hammond @hydrohammond.bsky.social · 07/12/2025
Been focused on photos of rivers from above for a few years, but starting to try my hand at rivers from below. Wish I could be snorkeling every day! sites.google.com/view/riversf...
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Ross Woods @rosswoodskiwi.bsky.social · 05/12/2025
New paper alert: "Diverging Impacts of Snow Fraction and Soil Drainage on Seasonal and Annual Water Balances Across Snow-Influenced Catchments" Led by Zeqiang Wang. A synthesis of some controls on spatial variations in snow-influenced hydrology across the USA. doi.org/10.1029/2025...
Diagram to illustrate synthesis of between-region and within-region water balance differences and their drivers across the snow-influenced US.
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Sarah H. Ledford @sledford.bsky.social · 28/11/2025
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.
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Darren Ficklin @dficklin.bsky.social · 25/11/2025
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...
nature.com
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...
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John Hammond @hydrohammond.bsky.social · 23/11/2025
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...
tu.org
Take Action - Trout Unlimited
It only takes a minute to stand up for clean water and healthy fisheries.
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John Hammond @hydrohammond.bsky.social · 19/11/2025
New preprint: “Do lagged ecosystem feedbacks to hydroclimate extremes promote resilience of forest watersheds?” doi.org/10.22541/ess... #Ecohydrology #ForestWatersheds #HydroclimateExtremes #LaggedFeedbacks #WaterResourcesResearch
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John Hammond @hydrohammond.bsky.social · 18/11/2025
“Universal hydrological trends post‑wildfire are obscured by local watershed variability” iopscience.iop.org/article/10.1... #Hydrology #Wildfire #WatershedProcesses #Streamflow #WaterResources
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Anne Jefferson @annejefferson.bsky.social · 17/11/2025
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]
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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 17/11/2025
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.
bsky.app
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John Hammond @hydrohammond.bsky.social · 16/11/2025
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.
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John Hammond @hydrohammond.bsky.social · 15/11/2025
Hydrological extreme impact on aquatic species in the news: phys.org/news/2025-10...
phys.org
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...
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Daniel Swain @weatherwest.bsky.social · 14/11/2025
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
Current forecast map from ECMWF model showing accumulated precipitation over the next 72 hours. A widespread region of 3-5 inches is indicated across much of Southern California.
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John Hammond @hydrohammond.bsky.social · 14/11/2025
“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.
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Larisa Tarasova @lytarasova.bsky.social · 14/11/2025
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 🤩
recruitingapp-5128.de.umantis.com
PhD Researcher (f/m/x): Hydrometric and isotopic event signatures to evaluate functional resilience of diverse hydrological systems to global change
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CUAHSI @cuahsi.bsky.social · 13/11/2025
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
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John Hammond @hydrohammond.bsky.social · 12/11/2025
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
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John Hammond @hydrohammond.bsky.social · 12/11/2025
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
wapo.st
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.
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John Hammond @hydrohammond.bsky.social · 11/11/2025
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:...
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Nicole C. Nelson @nicolecnelson.bsky.social · 06/11/2025
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
jobs.wisc.edu
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...
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