1.0 When dust, sand, snow, and/or spray is raised by the wind to a height of 6 feet or more 5 5 5 5 5 5 5 5 5 5 2 20 1 2003-09-06 2003-09-19 1998-10-22 1998-11-05 2002-08-30 2002-09-06 2002-10-22 1997-07-30 1997-08-15 1997-09-09 1997-09-17 1980-08-04 1980-08-11 1988-09-08 1988-09-19 1989-09-10 1989-09-22 1992-08-16 1992-08-28 259 287 286 296 306 273