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ANSI/TIA-222-G-2005

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The lastest version of the code for towers - TIA-222-G-2005 has went to
Limit State design and shows the following load combinations:
 
1. 1.2D + 1.0 Dg + 1.6 Wo
2. 0.9 D + 1.0 Dg + 1.6 Wo
3. 1.2 D + 1.0 Dg + 1.0 Di + 1.0 Wi + 1.0 Ti
4. 1.2 D + 1.0 Dg + 1.0 E
5. 0.9 D + 1.0 Dg + 1.0 E
 
My question is why the 1.6 factor for wind.  ANSI / ASCE
states  1.3 .
 
Gary Bunkers P.E.