John Hammond
@hydrohammond.bsky.social
đ€ 1627
đ„ 2939
đ 117
Research hydrologist and river photographer. www.riversfromabove.com
pinned post!
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....
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Hydrological Whiplash: Highlighting the Need for Better Understanding and Quantification of SubâSeasonal 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...
https://doi.org/10.1002/hyp.70113
12 months ago
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John Hammond
KinarNicholas.bsky.social
about 1 month ago
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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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.
about 1 month ago
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New preprint led by Aaron Heldmyer and Roy Sando: Random forest + donor gages to predict daily streamflow drought across CONUS. Regional drivers differâsoil moisture, precip, SWE matter most.
doi.org/10.5194/egus...
about 2 months ago
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đ„đ§ New paper out in Environmental Research: Water led by Brian Ebel! Synthesis shows how wildfires fundamentally shift hydrologic processes and streamflow generationâfrom infiltration and runoff to baseflow and flood response â post wildfire.
iopscience.iop.org/article/10.1...
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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
https://iopscience.iop.org/article/10.1088/3033-4942/ae2a64
about 2 months ago
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John Hammond
Sarah H. Ledford
2 months ago
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...
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CSAW REU
Overview
https://sites.google.com/view/csaw-reu?usp=sharing
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John Hammond
Hilary McMillan
2 months ago
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.
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John Hammond
Anne Jefferson
2 months ago
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/...
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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 ...
https://onlinelibrary.wiley.com/doi/10.1002/hyp.70362
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reposted by
John Hammond
Daniele Penna
2 months ago
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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Iâve 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 âyou love/hate itâ without much in the middle. Thoughts?
2 months ago
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reposted by
John Hammond
Giulia Bruno
3 months ago
A piece that felt particularly relevant to write
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reposted by
John Hammond
Ryoko Araki
3 months ago
Check out the end-of-the-year blogpost about model design by Jonathan Frame!
deepgroundwater.com/blog/what-do...
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What does your model do? - Deep Groundwater
A collection of open-source blog posts and articles
https://deepgroundwater.com/blog/what-does-your-model-do/
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reposted by
John Hammond
Ryan Webb
3 months ago
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...
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Snow Sublimation Significantly Decreases Following StandâReplacing 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
https://doi.org/10.1029/2025WR042119
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John Hammond
KinarNicholas.bsky.social
3 months ago
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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reposted by
John Hammond
Thiago Nascimento
3 months ago
Working with large-sample hydrology datasets and curious about how maps with varying levels of detail influence the identification of geologyâstreamflow relationships? Check out our latest preprint at HESS!
#Hydrology
#CatchmentHydrology
#LargeSampleHydrology
#Eawag
#hightlightpaper
#HESS
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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...
https://doi.org/10.5194/hess-29-7173-2025
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@rarakihydro.bsky.social
leads an exiting new preprint that maps dominant hydrologic processes across >14k US watersheds using streamflow signatures + ML. Itâs been such fun following Ryoko and Hilaryâs leadership alongside Admin, Anne and Gemma.
egusphere.copernicus.org/preprints/20...
3 months ago
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John Hammond
Frederik Kratzert
3 months ago
Excited to unveil Caravan-Qual! đ We've expanded the Caravan framework to bridge the gap between water quantity and quality. This new open dataset features: đč ~70M observations đč137k stations đč 100 constituents đč Linked streamflow, forcing & attributes Links in đ§”
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John Hammond
Margaret Zimmer
3 months ago
Happening this morning! Run donât walk to room 228-230 to hear
@zhaozhechen.bsky.social
talk hydroclimate-ET synchrony!!
@agu.org
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reposted by
John Hammond
Daniel Swain
3 months ago
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.
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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
https://youtu.be/FTKW68RqdkE
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reposted by
John Hammond
Eric Booth
3 months ago
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
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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...
https://doi.org/10.1038/s43247-025-03089-0
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reposted by
John Hammond
Daniel Swain
3 months ago
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...
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John Hammond
UK Centre for Ecology & Hydrology (UKCEH)
3 months ago
The latest UK Hydrological Summary has been published đ§ïž 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. đ§Ș 1/
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Photos from the Patapsco River in Maryland yesterday. Lucky to have the snow stick to the trees despite the high winds!
#riversfromabove
3 months ago
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reposted by
John Hammond
Daniel Swain
3 months ago
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
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John Hammond
The Associated Press
3 months ago
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.
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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.
https://bit.ly/4iNe3pE
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Sand bag deployment and flood as seen from USGS High Vis camera in Everson, WA
apps.usgs.gov/hivis/camera...
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3 months ago
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reposted by
John Hammond
Anthony Edwards
3 months ago
Officials warned of âlocally catastrophicâ 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.
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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.
https://www.sfchronicle.com/weather/article/washington-flooding-atmospheric-river-storm-21235047.php
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John Hammond
Steve Herman
3 months ago
Washington Gov. Bob Ferguson declares a statewide emergency in response to flooding occurring throughout the Pacific Northwest.
www.king5.com/article/weather...
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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.
https://www.king5.com/article/weather/weather-impact/statewide-emergency-declared-washington-flooding-atmospheric-river-rain/281-1268ff2c-9c5d-45b2-b94e-495b2c440412
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reposted by
John Hammond
Ross Woods
3 months ago
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
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Session HS2.2.5
https://www.egu26.eu/session/55911
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John Hammond
Daniel Swain
3 months ago
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]
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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...
3 months ago
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John Hammond
Ross Woods
3 months ago
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...
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reposted by
John Hammond
Sarah H. Ledford
4 months ago
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.
add a skeleton here at some point
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John Hammond
Darren Ficklin
4 months ago
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...
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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...
https://www.nature.com/articles/s41558-025-02504-w
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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...
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4 months ago
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New preprint: âDo lagged ecosystem feedbacks to hydroclimate extremes promote resilience of forest watersheds?â
doi.org/10.22541/ess...
#Ecohydrology
#ForestWatersheds
#HydroclimateExtremes
#LaggedFeedbacks
#WaterResourcesResearch
4 months ago
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âUniversal hydrological trends postâwildfire are obscured by local watershed variabilityâ
iopscience.iop.org/article/10.1...
#Hydrology
#Wildfire
#WatershedProcesses
#Streamflow
#WaterResources
4 months ago
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reposted by
John Hammond
Anne Jefferson
4 months ago
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
.
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John Hammond
KinarNicholas.bsky.social
4 months ago
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.
add a skeleton here at some point
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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.
4 months ago
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Hydrological extreme impact on aquatic species in the news:
phys.org/news/2025-10...
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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...
https://phys.org/news/2025-10-farmed-salmon-scotland-wild-storm.html
4 months ago
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reposted by
John Hammond
Daniel Swain
4 months ago
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
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âOn the Structure of Temporal Variability of Streamflow Responses and the Role of Timescale Interactions â A Synthesisâ A nice synthesis showing how streamflow variability emerges from interacting timescales â fast events like storms intertwined with slower processes like soil moisture and memory.
4 months ago
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John Hammond
Larisa Tarasova
4 months ago
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 đ€©
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John Hammond
CUAHSI
4 months ago
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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Refinding joy in exploring streamflow data đ just looking at the stories gages tell about rivers. Hereâs the Allagash River (ME), 1980â2020. Each line: a year of daily flow (JanâDec). Colors show each day compared to normal: green â normal, blue = high, red = low. đđ§
#Hydrology
#DataViz
#sciArt
4 months ago
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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
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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.
https://wapo.st/47MDvXi
4 months ago
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Iâm still figuring out bluesky⊠but with the goal of more easily finding information Iâm 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:...
4 months ago
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John Hammond
Nicole C. Nelson
4 months ago
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
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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...
https://jobs.wisc.edu/jobs/professor-of-history-madison-wisconsin-united-states
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@pbs.org
NOVA keeping up the excellent science communication on hydrological extremes!
youtu.be/VHvkp_Quaiw?...
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Superfloods: Why Deadly Flash Floods Are on the Rise | Full Documentary | NOVA | PBS
YouTube video by NOVA PBS Official
https://youtu.be/VHvkp_Quaiw?si=53UqImaNpT3CF-8s
4 months ago
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