Yesterday was a wonderful combination of high pressure, cool temperatures, and light winds. Rebecca and I couldn't pass up the opportunity to enjoy part of the Madison Range from the airplane.
We were surprised to find the temperature at 12,000 feet exactly matched the temperature on the ground in Ennis, this is indicative of a high powered inversion. Above 12,000 feet the wind sheared rather strongly to about 30 knots as the inversion ran out of juice. Our ride was surprisingly smooth as we danced vertically about the shear zone. Rebecca snapped this picture of a rare visual example of the Kelvin-Helmholz Instability beginning to form across a wide area from south to north at our altitude.
Ice climbers will be glad to know that Sphinx is still producing nice long thin dribbles of moderate water ice from top to bottom. Always check The Gallatin National Forest Avalanche Center for hazard information - and use your head - before going to Sphinx because she can be a nasty momma.
We added a total of thirteen photos to The Guidebook from our voyage to the Sphinx, be sure to check out the South Face - she's a beauty.