Lattice wireframe or cloud plot with different colours by a group

I have a question about wireframe 3-D plots and how to apply  
colors.  I have
a large dataset of river flow (m^3/s) over time, and I have coded  
these
flows based on their height.  I would like to produce a wireframe  
plot that
colors the graph based on the flow code, i.e. I would like high  
flows to be
red, medium to be green and low flows to be blue.  Here is some  
sample data
with the basic wireframe plot:

flow.dat=cbind.data.frame(flow=sin(2*pi/53*c(1:3000)) 
+1,day=as.numeric(format(as.Date(c(1:3000)),
format="%j")), year=as.numeric(format(as.Date(c(1:3000)),
format="%Y")),grp=c(rep(c("1.high","2.med","3.low"),1000)))

wireframe(flow~day*year, data=flow.dat, shade=T)

Is there any way to specify what colours are passed to the plot?  I.e.
wireframe(flow~day*year, data=flow.dat, shade=T, groups=grp,
col.group=c("#FF3030","#551A8B","#43CD80"))

I would also be happy if I could do this with a cloud plot, but I  
can't get
the colors to plot correctly.
cloud(flow~day*year, data=flow.dat, shade=T, groups=grp,
col.group=c("#FF3030","#43CD80","#1E90FF"), pch=20)

Any help is much appreciated!  Thank you.

-Pam Allen

allen_pam at hotmail.com


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