Originally Posted by: Ken  Originally Posted by: i4hanish Ok. I have had a look at the Lifted index LI for tomorrow afternoon in QLD. There is pretty much nothing there. So l had a look at the CAPE and it looks like the same as the ACC r model forecast. So l guess l have a question. Why is LI zilch but CAPE wide spread??  The link Select 1pm http://stormcast.com.au/...92703:aus:cape:null:0#scThe rain signal from GFS bcsh stormcast is weak in the afternoon but much stronger near Brisbane around 7pm Different model output. LI's only nominally measure the temp difference between rising parcels of air and the environmental air at a single fixed height (typically 500hpa), whereas CAPE uses the height range of the vertical profile of the atmosphere over a given point where rising air parcels are warmer than the surrounding air. So for example, if a rising parcel of air stays warmer than the surrounding air from when it condenses into cloud at say the 850hpa height right up to 300hpa, there's positive CAPE all the way from 850hpa up to 300hpa, and the amount of CAPE will depend on how much warmer that parcel will be than the surrounding air through that height range i.e. it's an integral. I do have trouble Ken . I really am a beginner here. With storm dynamics. I understand that CAPE gives a better representation of severe storm potential than LI ? I did some homework. CAPE means Convective available potential energy. So the highest CAPE tomorrow afternoon is over the Hinterlands near Murwillumbah way at around 300 joules/kg. So does that mean severe storms are more likely at 300 j/kg
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