From CAIC:

The CAIC has already begun to monitor the 2009-10 snowpack. The first avalanche incident of the new season was reported from Mt Meeker in Rocky Mountain National Park on October 5th. The small slab broke loose about 6 inches deep and 40 feet across and took two climbers on a short ride, with no injuries. The slide ran on the lower, or first pitch, of the Dream Weaver alpine climb. This route is located on the east side of the prominent north aspect buttress of 13,911 foot Mt Meeker. The first pitch ramps up to 50 degrees in some places. This route can see significant cross-loading deposit any fresh snow as slab at several areas along the route, though primarily at the first and last pitches.

Dreamweaver

They say first pitch here, but, from their description (40' wide), I'm assuming this was down on the approach apron to the climb. Glad everyone is okay in any case.