Skew-T Log-P Analysis
Skew-T Log-P Thermodynamic Diagram Analysis · Also known as: Skew-T, Skew-T Log-P diagram, Tephigram, Stuve diagram
The Skew-T Log-P diagram is a thermodynamic chart used extensively in meteorology to visualize atmospheric profiles of temperature, dew point, and pressure. Developed in its modern form by Reitan in the 1960s, it allows forecasters and researchers to quickly assess atmospheric stability, convective potential, wind shear, and other properties critical for weather diagnosis and prediction.
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When to use it
Use Skew-T analysis for daily weather forecasting, severe weather diagnosis, understanding atmospheric stability, evaluating model simulations, and teaching atmospheric thermodynamics. It is most useful when upper-air observations are available (typically twice daily from radiosondes) or from model soundings at individual grid points.
Strengths & limitations
- Intuitive visual representation where adiabatic processes plot as straight lines, making air parcel behavior transparent
- Single diagram encodes multiple pieces of information (temperature, moisture, wind, stability) simultaneously
- Rapid assessment of convective potential without numerical calculations; trained forecasters can diagnose stability in seconds
- Universal tool across meteorological communities; standard in weather services, research, and education worldwide
- Represents only a single vertical column; cannot show horizontal variations or interactions between multiple air masses
- Accuracy of diagnosis depends on quality and temporal representativeness of upper-air observations; radiosondes are launched only twice daily
- Interpretation requires training and experience; novices may misidentify layer boundaries or misread indices
- Grid resolution and font size on printed diagrams can limit precision for fine details
Frequently asked
What is the Lifting Condensation Level (LCL)?
The LCL is the height at which an air parcel lifted dry adiabatically reaches saturation. On a Skew-T, it is found by following the dry adiabat from the surface air parcel and intersecting it with the dew-point curve.
What is CAPE and why does it matter?
CAPE (Convective Available Potential Energy) is the integrated area between the parcel and environmental temperature curves above the Level of Free Convection. Higher CAPE (e.g., >3000 J/kg) indicates greater potential for vigorous convection and severe weather.
How do I read wind information from a Skew-T?
Wind barbs are plotted to the right of the profile line at specified pressure levels. The barb direction indicates wind direction, and the length and flags indicate wind speed (using standard meteorological conventions).
Why do we use log-pressure instead of height as the vertical axis?
Log-pressure is used because atmospheric density and most meteorological processes depend on pressure more directly than on geometric height. The logarithmic scaling also makes the diagram more compact and readable across a wider range of altitudes.
Sources
- Bluestein, H. B. (1992). Synoptic-dynamic meteorology in midlatitudes. Volume I: Principles of Kinematics and Dynamics. Oxford University Press. link ↗
- Stull, R. B. (2011). Wet-bulb temperature from relative humidity and air temperature. Journal of Applied Meteorology and Climatology, 50(11), 2267-2273. DOI: 10.1175/JAMC-D-11-0143.1 ↗
How to cite this page
ScholarGate. (2026, June 3). Skew-T Log-P Thermodynamic Diagram Analysis. ScholarGate. https://scholargate.app/en/meteorology/skew-t-log-p-analysis
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
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