The Dew-Point Anchor Hypothesis (DPAH) emphasizes the critical role of dewpoint-controlled Lifting Condensation Level (LCL) in anchoring intense low-level updrafts and vorticity stretching — a key ingredient for tornado genesis.
\nThis deposit applies DPAH to tornado environments, with a focused case study of the 20 May 2013 Moore, Oklahoma EF5 tornado. Key elements include:
\nResults show that the Moore EF5 environment produced exceptionally low LCL heights and a high DPAH-STP-like value, consistent with its violent outcome.
\nAll code is MIT-licensed and executable with standard scientific Python libraries.
", "languages": [ { "id": "eng", "title": { "en": "English" } } ], "publication_date": "2026-06-12", "publisher": "Zenodo", "references": [ { "reference": "Atkins, N.T., Butler, K.M., Flynn, K.R. and Wakimoto, R.M., 2014. An integrated damage, visual, and radar analysis of the 2013 Moore, Oklahoma, EF5 tornado. Bulletin of the American Meteorological Society, 95(10), pp.1549-1561. https://doi.org/10.1175/BAMS-D-14-00033.1" }, { "reference": "Gravelle, C.M., Mecikalski, J.R., Line, W.E., Bedka, K.M., Petersen, R.A., Sieglaff, J.M., Stano, G.T. and Goodman, S.J., 2016. Demonstration of a GOES-R satellite convective toolkit to \"bridge the gap\" between severe weather watches and warnings: An example from the 20 May 2013 Moore, Oklahoma, tornado outbreak. Bulletin of the American Meteorological Society, 97(1), pp.69-84. https://doi.org/10.1175/BAMS-D-14-00054.1" }, { "reference": "Zhang, Y., Zhang, F., Stensrud, D.J. and Meng, Z., 2015. Practical predictability of the 20 May 2013 tornadic thunderstorm event in Oklahoma: Sensitivity to synoptic timing and topographical influence. Monthly Weather Review, 143(8), pp.2973-2997. https://doi.org/10.1175/MWR-D-14-00394.1" }, { "reference": "Satrio, C.N., Bodine, D.J., Palmer, R.D. and Kuster, C.M., 2021. Multi-radar analysis of the 20 May 2013 Moore, Oklahoma supercell through tornadogenesis and intensification. Atmosphere, 12(3), p.313. https://doi.org/10.3390/atmos12030313" } ], "resource_type": { "id": "software", "title": { "de": "Software", "en": "Software" } }, "rights": [ { "description": { "en": "The Creative Commons Attribution license allows re-distribution and re-use of a licensed work on the condition that the creator is appropriately credited." }, "icon": "cc-by-icon", "id": "cc-by-4.0", "props": { "scheme": "spdx", "url": "https://creativecommons.org/licenses/by/4.0/legalcode" }, "title": { "en": "Creative Commons Attribution 4.0 International" } } ], "subjects": [ { "subject": "DPAH" }, { "subject": "Dew-Point Anchor Hypothesis" }, { "subject": "Tornadoes" }, { "subject": "Moore Oklahoma EF5" }, { "subject": "Significant Tornado Parameter" }, { "subject": "supercell" }, { "subject": "rear-flank downdraft" }, { "subject": "LCL" }, { "subject": "Tornado Alley" } ], "title": "Dew-Point Anchor Hypothesis (DPAH): Application to Tornado Environments \u2013 2013 Moore, Oklahoma EF5 Case Study with STP-like Parameter and Markov Transitions" }, "parent": { "access": { "owned_by": { "user": "1596635" }, "settings": { "accept_conditions_text": null, "allow_guest_requests": false, "allow_user_requests": false, "secret_link_expiration": 0 } }, "communities": { "default": "52fd08d6-2e2e-4e1f-a720-96804533404a", "entries": [ { "access": { "member_policy": "closed", "members_visibility": "public", "record_submission_policy": "open", "review_policy": "closed", "visibility": "public" }, "children": { "allow": false }, "created": "2026-04-17T08:35:17.894288+00:00", "custom_fields": { "subjects": [ { "id": "gemet:concept/1462" }, { "id": "mesh:D000090082" }, { "id": "gemet:concept/5197" }, { "id": "euroscivoc:281" }, { "id": "euroscivoc:1511" }, { "id": "euroscivoc:771" }, { "id": "euroscivoc:847" }, { "id": "mesh:D001272" }, { "id": "gemet:concept/639" }, { "id": "euroscivoc:265" }, { "id": "SDN:P02::HFLX" } ] }, "deletion_status": { "is_deleted": false, "status": "P" }, "id": "52fd08d6-2e2e-4e1f-a720-96804533404a", "links": {}, "metadata": { "curation_policy": "Dew-Point Anchor Hypothesis (DPAH) Community
\nThe Dew-Point Anchor Hypothesis rests on a fundamental reversal of the conventional modelling hierarchy in climate and planetary science.
\nThe prevailing radiative paradigm begins with a vacuum surface as the a priori — a hypothetical airless body whose effective temperature (Teff) is calculated from absorbed solar radiation alone. An atmosphere is then added as a secondary modifying layer. This vacuum-first approach defines the logical structure, independent variables, and direction of reasoning used in mainstream models.
\nIn direct contrast, the Dew-Point Anchor Hypothesis begins with the atmosphere itself as the a priori reality — a physically complete, massive, and thermodynamically active system that exists from the outset. Within this atmosphere-first framework, the primary boundary condition is the observable phase-equilibrium altitude where a condensable volatile reaches saturation: the Lifting Condensation Level (LCL) for water vapour on Earth, or its frost-point or cloud-base equivalent on other planets. This anchor height (not the dew-point temperature itself) is fixed by Clausius–Clapeyron physics and is directly measurable.
\nFrom this LCL thermodynamic anchor, surface temperature, surface pressure, and the vertical thermal profile emerge as dependent variables, determined downward via the adiabatic lapse rate under hydrostatic equilibrium. Radiative processes operate within this anchored structure rather than defining the baseline itself.
\nBy treating the atmosphere as the foundational reality rather than an add-on to a fictional vacuum state, DPAH eliminates the circular reasoning inherent in Teff-based models and restores physical primacy to thermodynamics, mass, composition, and phase behaviour.
\nThis foundational distinction — atmosphere-first versus vacuum-surface-first — is the central commitment of the DPAH community.
\nOur mission is to develop, test, and refine this inverse, observation-driven modelling framework through open, transparent, and citable research. We welcome contributions that explore the implications of this conceptual shift for Earth’s climate, planetary atmospheres, and geoscientific modelling.
\nAll records in this community are versioned, openly accessible under CC BY 4.0, and permanently archived on Zenodo.
", "description": "Dew-Point Anchor Hypothesis community explores the Lifting Condensation Level as the primary thermodynamic boundary in tropospheric modelling: Surface temperature and pressure are codependent variables anchored by Clausius\u2013Clapeyron phase equilibrium", "page": "This community is dedicated to the Dew-Point Anchor Hypothesis (DPAH) and its natural extension, the Frost-Point Anchor Hypothesis (FPAH) — a unified, complementary framework for understanding planetary atmospheres.
\nThe central idea is that, in any atmosphere with a condensable volatile, the altitude of the Lifting Condensation Level (LCL) — or its equivalent frost-point / sublimation level on other planets — acts as the primary, observable thermodynamic anchor. Once fixed by fundamental physics (vapor-pressure equilibrium), this level determines the vertical thermal structure. Surface temperature and surface pressure then emerge as dependent variables governed by the adiabatic lapse rate and hydrostatic equilibrium under top-of-atmosphere energy balance (Atmospheric Thermal Effect — ATE).
\nKey Extensions and Applications:
\nTitan as a Hybrid Case: Titan’s methane cycle provides a compelling hybrid example. Methane precipitation occurs primarily in the liquid phase near the surface (DPAH-style), forming rivers, lakes, and seas of liquid hydrocarbons. At higher, colder altitudes or in polar winter conditions, frost/sublimation processes (FPAH) become relevant for methane and other hydrocarbons. This makes Titan an excellent testbed for the broader Phase-Change Anchor Framework.
\nTogether, DPAH and FPAH form a coherent framework that spans warm and cold environments across the solar system — from Earth thunderstorms and cirrus clouds to Venus, Mars, Titan, and Pluto.
\nThe community welcomes deposits of papers, technical notes, datasets, model outputs (including Python toolbox scripts), and discussion materials related to this hypothesis. It aims to foster open, evidence-based scientific debate across geoscience, atmospheric physics, climate modelling, and planetary science.
\nAll contributions are welcome, provided they are civil, properly referenced, and advance understanding of the role of condensation and phase-change physics in atmospheric structure.
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