Wednesday, May 07, 2008

EHI Values

The above represents the NAM's depiction of EHI values (combination of CAPE and SRH). I highlighted areas with a value over 1, where supercells and tornadoes would be possible. The area really maxes out in southwest Alabama. I am of the opinion that in many cases SRH values outweigh CAPE values in importance, as long as a minimum amount of CAPE is available. The CAPE is necessary for convection but without SRH, any storms that form will not rotate. Based on that, I think areas in North and Central Alabama may be more prone to severe weather and tornadoes Thursday because helicity will be higher there. We shall see.

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