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Rich, WCHT is the revised wind chill formulation. WCEQ is the old formulation (per "phelp sfparm", $NAWIPS/doc/User_guide/pdf/apxA.pdf or the 5.6.E release whats new section). Also, you will see that the defined station model plots in NMAP2 (and SFMAP) in $GEMTBL/config/prmlst.tbl use the WCHT parameter as of January 2002, Steve Chiswell Unidata User Support On Tue, 2004-11-02 at 23:11, Richard Otto wrote: > Hello, > > We are running GEMPAK Version 5.7.2p2, and I had a quick question about > the wind chill surface parameter (WCEQ). It appears that GEMPAK is using > the old formula to calculate wind chills. Are there plans to incorporate > the new formula, or should I just manually input the equation into GEMPAK > to calculate wind chills via the new formula? If manual input into > GEMPAK is the way to go, how would I go about doing this? > > Thanks for any help. > > -Rich