<p>After initialization the model calculates forward in time ncluding all physical processes represented by your setup of WRF. This probably means that the warm air will rise and thereby trigger the supercell thunderstorm. Cape can be calculated for a parcel starting at any height. If the bubble (warm anomaly) is present at the surface, and you are interested in the so-called surface-based Cape, then I would set the temperature to the environmental temperature + the warm anomaly. Why not try out both and see what the difference is? This would give you an idea of the vertical forcing magnitude of the warm anomaly. </p>

CC BY-SA 4.0
2018-09-22T17:16:24.143Z
2018-09-22T17:16:24.143Z
Basileios
<p>I am running idealised supercell simulation using WRF model. The supercell storm is initiated with a thermal bubble. I just wonder if the thermal bubble is only affecting the initial temperature. </p>

<p>I ask because I am trying to calculate CAPE, and needed to set the parcel temperature. Parcel temperature is normally set to the environmental temperature at the surface. But since my simulation is initiated by a thermal bubble, I wonder if I should add the perturbed bubble temperature to the environmental temperature as my parcel temperature. Hope my question is clear.</p>

<meteorology><atmosphere-modelling><wrf>
Does thermal bubble initiated in WRF dissipate over time?
cwmwl
# Does thermal bubble initiated in WRF dissipate over time?

(Asked by: username_0 on 2017-05-15)

I am running idealised supercell simulation using WRF model. The supercell storm is initiated with a thermal bubble. I just wonder if the thermal bubble is only affecting the initial temperature.

I ask because I am trying to calculate CAPE, and needed to set the parcel temperature. Parcel temperature is normally set to the environmental temperature at the surface. But since my simulation is initiated by a thermal bubble, I wonder if I should add the perturbed bubble temperature to the environmental temperature as my parcel temperature. Hope my question is clear.

**Tags:** meteorology, atmosphere-modelling, wrf


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## 1 answers

### Answer by username_1 on 2018-09-22. Score: 1

After initialization the model calculates forward in time ncluding all physical processes represented by your setup of WRF. This probably means that the warm air will rise and thereby trigger the supercell thunderstorm. Cape can be calculated for a parcel starting at any height. If the bubble (warm anomaly) is present at the surface, and you are interested in the so-called surface-based Cape, then I would set the temperature to the environmental temperature + the warm anomaly. Why not try out both and see what the difference is? This would give you an idea of the vertical forcing magnitude of the warm anomaly.


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