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Fix transposed Hellmann exponent table in windspeed_powerlaw docstring #2853

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Fix transposed Hellmann exponent table in windspeed_powerlaw docstring #2853

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e0c991a
Fix transposed Hellmann exponent table in windspeed_powerlaw docstring
dylanpulver Sep 2, 2026
164cb8a
Add whatsnew entry for the Hellmann exponent table fix
dylanpulver Sep 2, 2026
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5 changes: 5 additions & 0 deletions docs/sphinx/source/whatsnew/v0.16.0.rst
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Expand Up @@ -75,6 +75,10 @@ Enhancements
Documentation
~~~~~~~~~~~~~
* Remove `g_poa_effective` from the :ref:`nomenclature` page (:pull:`2704`)
* Correct the transposed table of Hellmann exponents in the
:py:func:`pvlib.atmosphere.windspeed_powerlaw` docstring, which disagreed
with :py:data:`pvlib.atmosphere.HELLMANN_SURFACE_EXPONENTS` in four of its
nine cells. (:pull:`2853`)


Testing
Expand All @@ -101,3 +105,4 @@ Contributors
* Sai Asish Y (:ghuser:`SAY-5`)
* Kevin Anderson (:ghuser:`kandersolar`)
* Johann Loux (:ghuser:`JoLo90`)
* Dylan Pulver (:ghuser:`dylanpulver`)
6 changes: 3 additions & 3 deletions pvlib/atmosphere.py
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Expand Up @@ -728,11 +728,11 @@ def windspeed_powerlaw(wind_speed_reference, height_reference,
+-----------+--------------------+------------------+------------------+
| Stability | Open water surface | Flat, open coast | Cities, villages |
+===========+====================+==================+==================+
| Unstable | 0.06 | 0.10 | 0.27 |
| Unstable | 0.06 | 0.11 | 0.27 |
+-----------+--------------------+------------------+------------------+
| Neutral | 0.11 | 0.16 | 0.40 |
| Neutral | 0.10 | 0.16 | 0.34 |
+-----------+--------------------+------------------+------------------+
| Stable | 0.27 | 0.34 | 0.60 |
| Stable | 0.27 | 0.40 | 0.60 |
+-----------+--------------------+------------------+------------------+

In a report by Sandia [3]_, the equation was experimentally tested for a
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