Snow from the most recent storm is still sitting on top of old surfaces with a variety of textures. Today we found 10 cm(4 inches) of soft spring-like snow on top of a thick melt freeze crust on the southerly aspects of Mammoth Mountain. When we got on the lift at 9:30 there was still plenty of firm snow on groomers to take us quickly to the bottom of the next chair. Dropping off the back side of Mammoth just after 11 AM we found sun softened snow on East and Southeast aspects. The firm underlying snow was great for travel down and out to Twin Lakes Trailhead even in lower angle terrain. Having a fresh coat of wax on your board or skis was really helpful to get glide below 9000 feet.
Field Weather Observations:
Location Daves Wave/Visalia Bowl
Wind L -> NE
Blow Snow none
Surface Form/Size MFcr 0.5mm
Pen Boot/Pen Ski 5cm/5cm
Mid slope on a SE Aspect I dug down to note the depth of the old surface crust. Underneath the 10cm of Fist hard snow from the last storm I found 30cm of knife hard snow then 1 Finger + snow underneath the crust. This knife hard crust was very supportable. Note that boot and ski pen were the same depth. We also walked in boots on undisturbed snow lower down and did not punch through.