That is truely amazing. On goole earth I just measured it to be about 1400 miles across from the outermost western edge in west Texas to out a few hundred miles east of the Georgia coast.
Before I saw the link you supplied I was posting a comment about the distance I am from the storm in Dallas and that I was seeing bands of clouds 400 miles away. But 1400 is jaw dropping. It helps one to realize why you should fear God.