Click here to see the SAS code. 
Click here to see the example.

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Goal:  To create a map of the Tornado Outbreak of April 3-4, 1974

Here is the original (hand drawn?) map of these tornados...
http://www.ncdc.noaa.gov/img/climate/extremes/1999/april/map.jpg

Here is the page where I got the raw data:
http://www.spc.noaa.gov/archive/tornadoes/

The data was separated by state,
so I had to download the data for each of the states in the
original map, and unzipped the .zip files, producing...
altor       gator       intor       mitor       nctor       sctor       vator
iltor       kytor       mstor       ohtor       tntor       wvtor

Then 'grep' out the April 3rd & 4th 1974 data, and then combine them
into a single file (this is a unix command)...

 grep "^74.....0403" *tor | cut -c 7-87 > tornado.dat
 grep "^74.....0404" *tor | cut -c 7-87 >> tornado.dat


I annotated a small dot (pie) at each start & end point of each tornado 
segment, and annotated a line starting at the start point & ending at the 
end point of each tornado segment.

I annotated a color legend at the bottom/right,
and annotated the state abbreviations on each state (using the new
centroid() macro to estimate the center location of each state)
I annotated the noaa gif image at the top, and made room for it
by using blank titles.

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