Collection time: 1130-1140z Weather: T:-31.0C, wind: 8kts at 286. Sky conditions: FEW to SCT, thin stratus IC. Optics: 22 degree halo Where collected: 3 m N of the MSF. Description: Columns, bullets, bullet rossetts, hexagonal plates. Small dots on slides are frost contamination. 0365 to 0386 and 0422, 0424 from downwind side. 0389 to 0416 from upwind side. HG