Evaluating modifications to Tiedtke cumulus parameterization for improving summer precipitation forecasts in the nested grid of Taiwan Global Forecast System (TGFS v1.1)

Lin, Chang-Hung; Lien, Guo-Yuan; Hsiao, Ling-Feng

doi:10.5194/gmd-19-5207-2026

Articles | Volume 19, issue 11

https://doi.org/10.5194/gmd-19-5207-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/gmd-19-5207-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 11

Development and technical paper

|

16 Jun 2026

Development and technical paper |

| 16 Jun 2026

Evaluating modifications to Tiedtke cumulus parameterization for improving summer precipitation forecasts in the nested grid of Taiwan Global Forecast System (TGFS v1.1)

Chang-Hung Lin, Guo-Yuan Lien, and Ling-Feng Hsiao

Model code and software

CWA TGFS v1.1 model The Unified Forecast System https://doi.org/10.5281/zenodo.17452036

CWA TGFS v1.1_CRH model The Unified Forecast System https://doi.org/10.5281/zenodo.17452254

Short summary

This study presents a series of modifications to the Tiedtke convection scheme, aiming to improve summer rainfall predictions in the 4.8-km-resolution nested grid of the Taiwan Global Forecast System (TGFS). The modifications improve the spatial distribution of rainfall and reduce the heavy rainfall bias in five-day forecast, as demonstrated by case studies and evaluations over a two-month period.