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Reposted by John Hammond

Philippe Papin @pppapin.bsky.social · Aug 13

Just wanted to say that @ologies.bsky.social is one of my favorite podcasts I listen to with my wife & I was so happy she got a couple of rock ⭐s in our field to talk about #Hurricanes etc.

Just listened to parts 1 & 2. Both are great episodes & totally accessible to the general public. Bravo 👏

Ologies with Alie Ward @ologies.bsky.social · Aug 6

WE GOT HURRICANES 🌀

Stellar weather folks @drkimwood.bsky.social & @mattlanza.bsky.social chat:

-“deadlier” femme-named hurricanes
-anatomy of a cyclone
-the eyes have walls
-do we need a category 6?
-bonkers history
-Hurricane Hunters
-tracking the big ones
-cows
www.alieward.com/ologies/temp...

Tempestology (HURRICANES) Part 1 with Matt Lanza & Dr. Kim Wood — alie ward

Hurricanes. Typhoons. Cyclones. Tropical storms. Tropical depressions. What does it all MEAAAN? Let’s dive in. Career meteorologists Dr. Kim Wood of the University of Arizona and Space City Weather’s ...

www.alieward.com

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Reposted by John Hammond

NPR @npr.org · Jul 6

Several groups have mobilized to offer assistance to people affected by the Guadalupe River floods. via @texaspublicradio.bsky.social

Guadalupe River flood: How to help and how to find help

Several groups have mobilized to offer assistance to people affected by the Guadalupe River floods.

www.tpr.org

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Reposted by John Hammond

Larisa Tarasova @lytarasova.bsky.social · Apr 30

Very busy Thursday for the group at #EGU25 ☀️🌊🤪 #floods #droughts

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John Hammond @hydrohammond.bsky.social · May 8

Quinn Miller’s MS work is now out! onlinelibrary.wiley.com/doi/10.1002/...

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John Hammond @hydrohammond.bsky.social · May 5

“Groundwater dominates snowmelt runoff and controls streamflow efficiency in the western United States” www.nature.com/articles/s43...

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John Hammond @hydrohammond.bsky.social · Apr 21

“ROBIN: Reference observatory of basins for international hydrological climate change detection” www.nature.com/articles/s41...

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John Hammond @hydrohammond.bsky.social · Apr 17

“What is a drought-to-flood transition? Pitfalls and recommendations for defining consecutive hydrological extreme events”
egusphere.copernicus.org/preprints/20...

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John Hammond @hydrohammond.bsky.social · Apr 16

Patterns in the delineation points show a significant use in areas near cities and along transportation corridors. The median basin delineated in StreamStats over the last year is 2 square miles and number of delineations totaled 605,106.

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John Hammond @hydrohammond.bsky.social · Apr 16

StreamStats Delineations - Where are they?
This figure shows the density of delineations per 25 square kilometer grid for all delineations over the period 3/16/24-3/15/25. www.usgs.gov/media/images...

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Reposted by John Hammond

Hilary McMillan @mcmillanhydro.bsky.social · Apr 6

New paper! After much work by me and my students we created a global database of hundreds of research watersheds, and perceptual models of their hydrologic processes. We use the data to test classic theories on how climate and landscape control dominant processes. www.nature.com/articles/s44...

Global patterns in observed hydrologic processes - Nature Water

This study presents a global, searchable database of 400 research watersheds with published descriptions of dominant hydrologic flow pathways, supporting efficient hypothesis testing to investigate em...

www.nature.com

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Reposted by John Hammond

Margaret Zimmer @margaretzimmer.bsky.social · Apr 1

Latest paper out of the WS hydrology lab! Here we show spatial variability in lithology is important for streamflow behavior and carbon export, but geogenic solute export behavior is similar. agupubs.onlinelibrary.wiley.com/doi/full/10....

The Role of Lithology on Concentration‐Discharge Relationships and Carbon Export in Two Adjacent Headwater Catchments

Bedrock lithology drives differences in streamflow and carbon export in adjacent catchments, controlling variability in shallow flow paths Both catchments display similar in-stream major ion conc...

agupubs.onlinelibrary.wiley.com

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Reposted by John Hammond

KinarNicholas.bsky.social @kinarnicholas.bsky.social · Apr 5

Hydrology Paper of the Day @margaretzimmer.bsky.social on how subsurface geology influences discharge and transport processes in two headwater catchments of the Diablo Range, California affected by wildfire: sedimentary and mélange lithologies, and understanding spatiotemporal DOC export.

Margaret Zimmer @margaretzimmer.bsky.social · Apr 1

Latest paper out of the WS hydrology lab! Here we show spatial variability in lithology is important for streamflow behavior and carbon export, but geogenic solute export behavior is similar. agupubs.onlinelibrary.wiley.com/doi/full/10....

The Role of Lithology on Concentration‐Discharge Relationships and Carbon Export in Two Adjacent Headwater Catchments

Bedrock lithology drives differences in streamflow and carbon export in adjacent catchments, controlling variability in shallow flow paths Both catchments display similar in-stream major ion conc...

agupubs.onlinelibrary.wiley.com

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John Hammond @hydrohammond.bsky.social · Apr 2

“Global patterns in observed hydrologic processes” @mcmillanhydro.bsky.social @rarakihydro.bsky.social @jansei.bsky.social www.nature.com/articles/s44...

Global patterns in observed hydrologic processes - Nature Water

This study presents a global, searchable database of 400 research watersheds with published descriptions of dominant hydrologic flow pathways, supporting efficient hypothesis testing to investigate em...

www.nature.com

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John Hammond @hydrohammond.bsky.social · Mar 31

“Linking wetlands to relatively permanent flowing waters: a conterminous United States geospatial analysis” - 79% or 66% of freshwater palustrine wetlands are potentially connected to the stream network, depending if inclusive,exclusive flow permanence network used

link.springer.com/article/10.1...

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John Hammond @hydrohammond.bsky.social · Mar 31

“A low-cost approach to monitoring streamflow dynamics in small, headwater streams using timelapse imagery and a deep learning model” egusphere.copernicus.org/preprints/20...

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John Hammond @hydrohammond.bsky.social · Mar 20

Special thanks to James McNamara for guidance on this commentary, and to @manuelaibrunner.bsky.social for their insight and indispensable contributions to this paper. Keep an eye out for research on this topic from all coauthors, and we hope you join the quest to better understand this phenomenon!

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John Hammond @hydrohammond.bsky.social · Mar 20

We (1) describe hydrological intensification and whiplash impacts, (2) introduce complexities in quantifying transitions, (3) discuss the processes controlling transitions and trends, (4) discuss considerations involved in modelling these transitions, (5) suggest priority research questions

Figure 1. Hydrological intensification, hydrological extreme transitions, and a sub-seasonal subset of hydrological extreme transitions we propose terming hydrological whiplash illustrated by (a) spatial and temporal scale, and (b–d) through time. Lines in panel b are meant to show the direction and not rate of trend and are informed by: Precipitation event intensity—Ficklin et al. (2022), dry spell length—Madakumbura et al. (2019), snow season length—Mudryk et al. (2020).

Figure 2. Questions water management decision makers may confront related to sub-seasonal hydrological extreme transitions categorised by temporal (a) and spatial (b) scale. While hydrological whiplash is specifically a sub-seasonal phenomenon, rapid transitions between floods and droughts can impact water management decisions even at annual to decadal scales.

Figure 3. Sub-seasonal hydrological extreme transitions in recent years illustrated using threshold definitions similar to those from Götte and Brunner (2024). Note that Götte and Brunner (2024) use a smoothed time series to identify drought, while a non-smoothed streamflow time series is shown in the panels above. While Götte and Brunner (2024) focused on drought-to-flood transitions, we also show a flood-to-drought example here. Discharge data associated with U.S. Geological Survey (USGS) streamgages are available from the U.S. Geological Survey National Water Information System (2025).

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John Hammond @hydrohammond.bsky.social · Mar 20

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....

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

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Reposted by John Hammond

Frederik Kratzert @kratzert.bsky.social · Mar 15

New paper from our group about something we do for a while but never took the time to publish.

What can you do with missing data in deep learning based hydro models?

Also I want to boost @gauchm.bsky.social. Welcome to BlueSky!

Link to preprint, code and results in his thread.

Martin Gauch @gauchm.bsky.social · Mar 15

Starting on bsky with a new preprint: "How to deal w___ missing input data"
doi.org/10.31223/X50...

Missing input data is a very common challenge in deep learning for hydrology: weather providers have outages, some data products start later than others, some only exist for certain regions, etc.

Different scenarios for missing input data: outages at individual time steps (top), data products starting at different points in time (middle), and local data products that are not available for all basins (bottom). All of these scenarios reduce the number of training samples for models that cannot cope with missing data (yellow, small box), while the models presented in this paper can be trained on all samples with valid targets (purple, large box).

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Reposted by John Hammond

UBC Geography @ubcgeography.bsky.social · Mar 4

New research from our faculty Kate Hale (@katehale.bsky.social) and Vrije Universiteit Amsterdam’s Wouter Berghuijs shows how climate change affects river flows in snowy regions across the Northern Hemisphere.

Learn more in the Nature publication: www.nature.com/articles/s41...

Photo of alpine mountain tops ribboned with snow and a lake in the valley below.

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John Hammond @hydrohammond.bsky.social · Mar 7

The snow drought in the southwest could lead to lower and earlier peak and low flows, a longer duration at low flow, and lower runoff efficiency: www.tandfonline.com/doi/full/10....

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John Hammond @hydrohammond.bsky.social · Mar 7

-Climate change challenges traditional drought assessments
-Reducing the sensitivity of drought indicators to non-stationarity is essential for accurately assessing drought
-Multiple drought definitions or concepts are possible, and needed, to correctly assess drought in a changing climate

Prioritization of Research on Drought Assessment in a Changing Climate

Climate change adds conceptual and quantitative challenges to traditional drought assessments Reducing the sensitivity of drought indicators to non-stationarity is essential for accurately assess...

agupubs.onlinelibrary.wiley.com

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Reposted by John Hammond

Katharine Hayhoe @katharinehayhoe.com · Feb 18

Great interview by @climateadam.bsky.social who never shies away from asking scientists the tough questions about how we FEEL ⬇️

Mike Dettinger @mdettinger.bsky.social · Feb 18

...like standing in front of an approaching train...yeah, that how it feels (espec when talking to family and friends who you feel need protecting).

www.nature.com/articles/d41...

‘Researching climate change feels like standing in the path of an approaching train’

Studying the impacts of extreme weather events can exact a heavy mental toll. Finding your ‘happy place’ is an important coping strategy.

www.nature.com

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Reposted by John Hammond

Katharine Hayhoe @katharinehayhoe.com · Feb 19

@cleanetwork.bsky.social welcome, so glad to see you here! I just added you to this starter pack, where you will find many kindred spirits.

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Stand Up for Science! @standupforscience.bsky.social · Feb 12

Welcome to the Bluesky account for Stand Up for Science 2025!

Keep an eye on this space for updates, event information, and ways to get involved. We can't wait to see everyone #standupforscience2025 on March 7th, both in DC and locations nationwide!

#scienceforall #sciencenotsilence

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