Key Parameters

Frontal Parameters (TFP, equivalent thickness)

The typical configurations of key parameters for fronts and thickness ridge are described in detail in the relevant conceptual model chapters (see Cold Front , Cold Front in Cold Advection , Cold Front in Warm Advection , Split Front , Arctic Cold Front , Warm Front Band , Warm Front Shield , Detached Warm Front , Occlusion: Warm Conveyor Belt type , Instant Occlusion , Occlusion: Cold Conveyor Belt Type , Cold Air Development and Baroclinic Boundary ).
The relevant area is the thickness ridge ahead of the CF.

08 August 2004/18.00 UTC - Meteosat 8 IR 10.8 image; lines: blue: thermal front parameter 500/850 hPa, green: equivalent thickness 500/850 hPa

Stability index (Showalter index)

An area with high probability for Cb development will normally have Showalter index with values below 3 units.

08 August 2004/18.00 UTC - Meteosat 8 IR 10.8 image; lines: green: equivalent thickness 500/850 hPa, yellow: Showalter index 500/850 hPa

Equivalent potential temperature at 850 hPa

Tongue of high values of ThetaE; MCS develop in the area of the maximum values

08 August 2004/18.00 UTC - Meteosat 8 IR 10.8 image; lines: magenta: ThetaE 850 hPa