These could be fun to chase!

severe weather statement
national weather service pueblo co
217 pm mst day mar 22 2006

...strong dust devils reported in the san luis valley...
at 210 pm...reports from the colorado state patrol indicated strong
dust devils occurring in the san luis valley south of antonito.
radar shows no precipitation in the area...and satellite pictures
only indicate small cumulus clouds in the region. additional dust
devils may occur in the san luis valley...especially the southern
part of the valley...through late afternoon.