# \#openifs-cloud-processes

**URL:** https://forum.ecmwf.int/tag/openifs-cloud-processes/169.md

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## [Model timestep choice and impact on low cloud](https://forum.ecmwf.int/t/model-timestep-choice-and-impact-on-low-cloud/12148)

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**Author:** [@Glenn\_Carver](https://forum.ecmwf.int/u/Glenn_Carver)\
**Replies:** 2\
**Last updated:** [10 October 2017 15:34 UTC](https://forum.ecmwf.int/t/model-timestep-choice-and-impact-on-low-cloud/12148 "2017-10-10T15:34:52Z")

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I'm using OpenIFS 40r1 for some long integrations. I have been testing using a different model timestep but found that the amount of low cloud simulated by the model is sensitive to the timestep. I'm using the recommende…

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## [3D cloud layer in OpenIFS (CALLPAR.F90)](https://forum.ecmwf.int/t/3d-cloud-layer-in-openifs-callpar-f90/12098)

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**Author:** [@Marston\_Ward](https://forum.ecmwf.int/u/Marston_Ward)\
**Replies:** 5\
**Last updated:** [30 August 2017 12:06 UTC](https://forum.ecmwf.int/t/3d-cloud-layer-in-openifs-callpar-f90/12098 "2017-08-30T12:06:21Z")

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Hey! I was wondering is you could verify that OpenIFS Cy40r1 callpar.F90 can produce cloud fraction (3D or layered) that are greater than 1.0? I've been seeing values as high as 1.43 and I find this very strange? If …